Vibration Monitoring Intervals and Balancing Schedules for Rotating Equipment | Vibromera<\/title>\n<meta name=\"description\" content=\"How often to check vibration: risk-based intervals, trending methods, condition-based balancing triggers. ISO 17359 criticality approach. Field case: 14 months without rebalance.\">\n<meta name=\"keywords\" content=\"how often to check vibration, vibration monitoring frequency, vibration trending, when to rebalance rotor, vibration monitoring intervals, condition based maintenance, predictive maintenance vibration, ISO 17359, ISO 10816, Balanset-1A\">\n<meta name=\"author\" content=\"Nikolai Shelkovenko\">\n<meta name=\"robots\" content=\"index, follow, max-image-preview:large, max-snippet:-1\">\n\n\n\n<meta property=\"og:type\" content=\"article\">\n<meta property=\"og:url\" content=\"https:\/\/vibromera.eu\/vibration-monitoring-intervals\/\">\n<meta property=\"og:title\" content=\"Vibration Monitoring Intervals and Balancing Schedules\">\n<meta property=\"og:description\" content=\"How often to measure vibration on rotating equipment. Risk-based intervals, trending, condition-based rebalancing. Field data included.\">\n<meta property=\"og:image\" content=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/04\/IMG_20180419_115503_HDR-e1558697914761.jpg\">\n<meta property=\"og:site_name\" content=\"Vibromera\">\n<meta property=\"og:locale\" content=\"en_US\">\n<meta property=\"article:author\" content=\"Nikolai Shelkovenko\">\n<meta property=\"article:published_time\" content=\"2025-03-15T08:00:00+00:00\">\n<meta property=\"article:modified_time\" content=\"2025-06-10T10:00:00+00:00\">\n<meta property=\"article:section\" content=\"Technical Guides\">\n<meta property=\"article:tag\" content=\"vibration monitoring\">\n<meta property=\"article:tag\" content=\"predictive maintenance\">\n<meta property=\"article:tag\" content=\"condition based maintenance\">\n\n\n<meta name=\"twitter:card\" content=\"summary_large_image\">\n<meta name=\"twitter:title\" content=\"How Often to Check Vibration and When to Rebalance\">\n<meta name=\"twitter:description\" content=\"Risk-based monitoring intervals, vibration trending methods, condition-based balancing triggers. 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Vibration meter, FFT spectrum, trending, and 1- or 2-plane balancing in one device.\",\n \"brand\": {\n \"@type\": \"Brand\",\n \"name\": \"Vibromera\"\n },\n \"manufacturer\": {\n \"@id\": \"https:\/\/vibromera.eu\/#organization\"\n },\n \"offers\": {\n \"@type\": \"Offer\",\n \"url\": \"https:\/\/vibromera.eu\/product\/balanset-1\/\",\n \"priceCurrency\": \"EUR\",\n \"price\": \"1975\",\n \"availability\": \"https:\/\/schema.org\/InStock\",\n \"itemCondition\": \"https:\/\/schema.org\/NewCondition\",\n \"priceValidUntil\": \"2026-12-31\"\n },\n \"additionalProperty\": [\n {\n \"@type\": \"PropertyValue\",\n \"name\": \"Channels\",\n \"value\": \"2\"\n },\n {\n \"@type\": \"PropertyValue\",\n \"name\": \"Vibration range\",\n \"value\": \"0.02\u201380 mm\/s\"\n },\n {\n \"@type\": \"PropertyValue\",\n \"name\": \"Frequency range\",\n \"value\": \"5\u2013550 Hz\"\n },\n {\n \"@type\": \"PropertyValue\",\n \"name\": \"RPM range\",\n \"value\": \"100\u2013100,000\"\n },\n {\n \"@type\": \"PropertyValue\",\n \"name\": \"Phase accuracy\",\n \"value\": \"\u00b11\u00b0\"\n },\n {\n \"@type\": \"PropertyValue\",\n \"name\": \"Balancing planes\",\n \"value\": \"1 or 2\"\n },\n {\n \"@type\": \"PropertyValue\",\n \"name\": \"Weight with case\",\n \"value\": \"4 kg\"\n },\n {\n \"@type\": \"PropertyValue\",\n \"name\": \"Software license\",\n \"value\": \"Lifetime, included\"\n },\n {\n \"@type\": \"PropertyValue\",\n \"name\": \"Warranty\",\n \"value\": \"2 years\"\n }\n ]\n}<\/script>\n\n<script type=\"application\/ld+json\">\n{\n \"@context\": \"https:\/\/schema.org\",\n \"@type\": \"FAQPage\",\n \"mainEntity\": [\n {\n \"@type\": \"Question\",\n \"name\": \"How often should I check vibration on rotating equipment?\",\n \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"It depends on criticality. Critical machines (safety risk, plant shutdown): continuous online monitoring or weekly portable checks. Essential equipment (production bottleneck): monthly. General-purpose (redundant units): quarterly. The interval should be shorter than half the expected time from first detectable fault to failure.\" }\n },\n {\n \"@type\": \"Question\",\n \"name\": \"When should I rebalance a rotor?\",\n \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"Rebalance when the 1\u00d7 RPM vibration component exceeds your plant's acceptable limit and diagnosis confirms unbalance as the dominant fault. Also rebalance after any maintenance that changes mass distribution: impeller replacement, blade repair, coupling change, motor rewind. Do not schedule balancing on a calendar \u2014 it's a condition-based action.\" }\n },\n {\n \"@type\": \"Question\",\n \"name\": \"What vibration level triggers action?\",\n \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"ISO 10816-3 provides zone boundaries for industrial machinery. Zone A (new\/good): up to 2.8 mm\/s. Zone B (acceptable for long-term): 2.8\u20137.1 mm\/s. Zone C (limited operation): 7.1\u201311.2 mm\/s. Zone D (damage imminent): above 11.2 mm\/s. These are overall RMS velocity for Group 2 machines (15\u2013300 kW, rigid foundation). Your plant may set tighter limits.\" }\n },\n {\n \"@type\": \"Question\",\n \"name\": \"Why does vibration return soon after balancing?\",\n \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"Three common causes: (1) Dirty rotor \u2014 deposits shift or fall off, destroying the balance. (2) Thermal distortion \u2014 the rotor bows when hot, changing mass distribution. (3) Loose fit \u2014 the rotor or components shift on the shaft during starts. If vibration returns within weeks, investigate the root cause rather than rebalancing repeatedly.\" }\n },\n {\n \"@type\": \"Question\",\n \"name\": \"Can I use a portable instrument instead of permanent monitoring?\",\n \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"Yes, for most equipment. Portable instruments like the Balanset-1A are standard for periodic route-based monitoring. They cover vibration measurement, trending, and on-site balancing. Permanent monitoring is justified for critical machines where failure consequences are severe, faults develop fast, or access is restricted.\" }\n },\n {\n \"@type\": \"Question\",\n \"name\": \"What's the difference between in-situ and workshop balancing?\",\n \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"Workshop balancing is done on a balancing machine during manufacturing or overhaul. In-situ balancing is done on the assembled machine in the field, using a portable instrument like the Balanset-1A. 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}\n@media (max-width:700px) { .vm-cta { grid-template-columns:1fr; text-align:center; } }\n.vm-cta__title { font-family:var(--vm-serif); font-size:24px; color:var(--vm-ink); margin-bottom:8px; }\n.vm-cta__text { font-size:16px; color:var(--vm-ink-muted); line-height:1.6; margin:0; }\n.vm-cta__actions { display:flex; flex-direction:column; gap:10px; }\n.vm-btn { display:inline-flex; align-items:center; justify-content:center; gap:8px; padding:14px 26px; border-radius:10px; font-family:var(--vm-font); font-size:16px; font-weight:600; text-decoration:none; border:none; cursor:pointer; transition:all 0.25s; white-space:nowrap; }\n.vm-btn--primary { background:linear-gradient(135deg, var(--vm-anthracite) 0%, var(--vm-anthracite-light) 100%); color:#fff; box-shadow:0 4px 14px rgba(48,48,64,0.3); }\n.vm-btn--primary:hover { transform:translateY(-2px); box-shadow:0 6px 20px rgba(48,48,64,0.4); color:#fff; text-decoration:none; }\n.vm-btn--outline { background:transparent; color:var(--vm-ink); border:1.5px solid var(--vm-border-strong); }\n.vm-btn--outline:hover { background:var(--vm-paper-cool); text-decoration:none; }\n.vm-btn--whatsapp { background:#25D366; color:#fff; }\n.vm-btn--whatsapp:hover { background:#1ebe5d; transform:translateY(-1px); color:#fff; text-decoration:none; }\n\n\/* === AUTHOR === *\/\n.vm-author { margin:52px 0 40px; padding:26px 28px; background:var(--vm-paper-warm); border:1px solid var(--vm-border); border-radius:10px; display:flex; gap:18px; align-items:flex-start; }\n.vm-author__avatar { width:52px; height:52px; border-radius:14px; background:var(--vm-anthracite); color:#fff; display:flex; align-items:center; justify-content:center; font-weight:700; font-size:17px; flex-shrink:0; }\n.vm-author__name { font-weight:700; color:var(--vm-ink); font-size:17px; }\n.vm-author__role { font-size:14px; color:var(--vm-ink-muted); margin-bottom:6px; }\n.vm-author__bio { font-size:15px; line-height:1.6; color:var(--vm-ink-soft); margin:0; }\n\n\/* === MOBILE === *\/\n@media (max-width:640px) {\n .vm-article { font-size:16px; }\n .vm-hero__inner { padding:50px var(--vm-gutter) 36px; }\n .vm-hero__title { font-size:24px; }\n .vm-hero__lead { font-size:16px; }\n .vm-toc { padding:18px; }\n .vm-section__title { font-size:22px; margin-top:48px; }\n .vm-h3 { font-size:18px; }\n .vm-field-report { padding:24px 18px; }\n .vm-field-report__title { font-size:20px; }\n .vm-cta { padding:24px 18px; }\n .vm-cta__title { font-size:21px; }\n .vm-author { flex-direction:column; }\n .vm-faq-item__q { padding:14px 16px; font-size:16px; }\n .vm-callout { padding:16px 18px; }\n .vm-container { padding:0 16px; }\n .vm-data-card__value { font-size:22px; }\n}\n@media print {\n .vm-hero { min-height:auto; }\n .vm-hero__bg { display:none; }\n .vm-hero__overlay { display:none; }\n .vm-hero__title, .vm-hero__lead { color:#000; }\n .vm-field-report { background:#eee !important; color:#000; }\n}\n<\/style>\n<\/head>\n<body>\n<article class=\"vm-article\" itemscope itemtype=\"https:\/\/schema.org\/TechArticle\">\n\n\n<header class=\"vm-hero\">\n <div class=\"vm-hero__bg\">\n <img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/04\/IMG_20180419_115503_HDR-e1558697914761.jpg\"\n alt=\"Portable vibration measurement on industrial rotating equipment using Balanset-1A\"\n loading=\"eager\" width=\"1200\" height=\"800\">\n <\/div>\n <div class=\"vm-hero__overlay\"><\/div>\n <div class=\"vm-hero__inner\">\n <nav class=\"vm-hero__breadcrumb\" aria-label=\"Breadcrumb\">\n <a href=\"https:\/\/vibromera.eu\/\">Home<\/a><span class=\"vm-hero__breadcrumb-sep\">\u203a<\/span>\n <a href=\"https:\/\/vibromera.eu\/knowledge-base\/\">Knowledge Base<\/a><span class=\"vm-hero__breadcrumb-sep\">\u203a<\/span>\n <span>Monitoring Intervals<\/span>\n <\/nav>\n <div class=\"vm-hero__tag\">Predictive Maintenance<\/div>\n <h1 class=\"vm-hero__title\" itemprop=\"headline\">How Often to Check Vibration \u2014 and When That Check Should Become a Balance Job<\/h1>\n <p class=\"vm-hero__lead\" itemprop=\"description\">Check too rarely and you miss the window. Check too often and you waste hours on healthy machines. Here's how to set the right interval, track what matters, and know exactly when a rotor needs rebalancing.<\/p>\n <div class=\"vm-hero__meta\">\n <span class=\"vm-hero__meta-item\" itemprop=\"author\" itemscope itemtype=\"https:\/\/schema.org\/Person\">By <strong style=\"color:rgba(255,255,255,0.52); margin-left:4px;\" itemprop=\"name\">Nikolai Shelkovenko<\/strong><\/span>\n <span class=\"vm-hero__meta-divider\"><\/span>\n <span class=\"vm-hero__meta-item\"><time itemprop=\"datePublished\" datetime=\"2025-03-15\">Mar 15, 2025<\/time><\/span>\n <span class=\"vm-hero__meta-divider\"><\/span>\n <span class=\"vm-hero__meta-item\">Updated <time itemprop=\"dateModified\" datetime=\"2025-06-10\">Jun 2025<\/time><\/span>\n <span class=\"vm-hero__meta-divider\"><\/span>\n <span class=\"vm-hero__meta-item\">12 min read<\/span>\n <\/div>\n <\/div>\n<\/header>\n\n\n<div class=\"vm-container\">\n<nav class=\"vm-toc\" aria-label=\"Table of contents\">\n <div class=\"vm-toc__title\">In this guide<\/div>\n <ol class=\"vm-toc__list\">\n <li><a href=\"#intervals\">Setting the Right Monitoring Interval<\/a><\/li>\n <li><a href=\"#approaches\">Continuous vs Periodic: Two Approaches, One Goal<\/a><\/li>\n <li><a href=\"#trending\">Vibration Trending: What to Track and How<\/a><\/li>\n <li><a href=\"#triggers\">When to Rebalance: 4 Condition-Based Triggers<\/a><\/li>\n <li><a href=\"#quick-return\">Why Vibration Returns Soon After Balancing<\/a><\/li>\n <li><a href=\"#field-report\">Field Report: 14 Months Between Balances<\/a><\/li>\n <li><a href=\"#iso\">ISO 10816 Severity Reference<\/a><\/li>\n <li><a href=\"#faq\">Frequently Asked Questions<\/a><\/li>\n <\/ol>\n<\/nav>\n\n\n<h2 class=\"vm-section__title\" id=\"intervals\">Setting the Right Monitoring Interval<\/h2>\n\n<p>There is no universal schedule. \"Monthly\" is not always right. \"Quarterly\" is not always wrong. The correct interval depends on one thing: <strong>how fast can a fault develop from first detectable symptom to functional failure?<\/strong> ISO 17359 calls this the \"lead time to failure.\"<\/p>\n\n<p>The rule is simple: measure at intervals shorter than half the lead time to failure. If a bearing typically takes two months from first spalling to seizure, measure at least monthly. If a fan impeller accumulates enough dust to shift vibration in three weeks, check every 10 days. The half-interval rule gives you at least two data points in the fault development window \u2014 enough to see the trend and plan action before failure.<\/p>\n\n<div class=\"vm-callout vm-callout--info\">\n <div class=\"vm-callout__label\">The core principle<\/div>\n <p class=\"vm-callout__text\">Monitoring interval = <strong>\u00bd \u00d7 lead time to failure<\/strong>. If you don't know the lead time, start monthly and tighten the interval when trending data shows how fast faults develop on your specific equipment.<\/p>\n<\/div>\n\n<h3 class=\"vm-h3\">Risk-based interval selection<\/h3>\n\n<p>ISO 17359 provides a criticality framework. Start with these intervals, then adjust based on what your data actually shows.<\/p>\n\n<div class=\"vm-table-wrap\">\n<table class=\"vm-table\">\n <thead><tr><th>Criticality<\/th><th>Description<\/th><th>Starting interval<\/th><th>Examples<\/th><\/tr><\/thead>\n <tbody>\n <tr><td class=\"vm-table__accent\">Critical<\/td><td>Safety risk, plant shutdown, environmental impact<\/td><td>Continuous or weekly<\/td><td>Main compressors, boiler fans, turbines<\/td><\/tr>\n <tr><td class=\"vm-table__accent\">Essential<\/td><td>Production bottleneck, long spare lead time<\/td><td>Monthly<\/td><td>Process pumps, cooling towers, key HVAC<\/td><\/tr>\n <tr><td class=\"vm-table__accent\">General purpose<\/td><td>Redundant units, manageable repair impact<\/td><td>Quarterly<\/td><td>Standby pumps, warehouse ventilation<\/td><\/tr>\n <tr><td class=\"vm-table__accent\">Run-to-failure<\/td><td>Low cost, non-critical, quick replacement<\/td><td>Visual \/ audible only<\/td><td>Small exhaust fans, fractional-HP motors<\/td><\/tr>\n <\/tbody>\n<\/table>\n<\/div>\n\n<p>These are starting points. The moment you detect a change \u2014 a vibration level creeping up, a new frequency appearing in the spectrum \u2014 increase measurement frequency immediately. A machine that was \"quarterly\" becomes \"weekly\" the moment it shows a developing fault.<\/p>\n\n\n<h2 class=\"vm-section__title\" id=\"approaches\">Continuous vs Periodic: Two Approaches, One Goal<\/h2>\n\n<div class=\"vm-approach-grid\">\n <div class=\"vm-approach-card\">\n <h3 class=\"vm-approach-card__title\">Continuous online monitoring<\/h3>\n <div class=\"vm-approach-card__meta\">Permanently installed sensors \u00b7 Near real-time analysis<\/div>\n <p class=\"vm-approach-card__text\">Use when failure consequences are severe (safety, environment, total plant shutdown), when faults develop fast (hours to days), or when equipment is physically inaccessible (hazardous areas, remote sites, offshore). Requires wired or wireless sensor infrastructure, data acquisition, and analysis software. Higher capital cost, but catches fast-developing faults that periodic routes would miss.<\/p>\n <\/div>\n <div class=\"vm-approach-card\">\n <h3 class=\"vm-approach-card__title\">Periodic route-based monitoring<\/h3>\n <div class=\"vm-approach-card__meta\">Portable instrument \u00b7 Scheduled rounds \u00b7 Walk-around routes<\/div>\n <p class=\"vm-approach-card__text\">A technician collects data with a portable instrument during scheduled rounds. Fits most balance-of-plant equipment: fans, pumps, motors, compressors where redundancy exists and faults develop over weeks or months. The <a href=\"https:\/\/vibromera.eu\/product\/balanset-1\/\">Balanset-1A<\/a> works for both \u2014 vibration measurement during the monitoring round, and on-site balancing when the data says it's time.<\/p>\n <\/div>\n<\/div>\n\n<p>Most plants use both. Critical assets get online systems. Everything else gets periodic routes with a portable instrument. The key is matching the approach to the criticality and fault development speed \u2014 not choosing one method for the entire plant.<\/p>\n\n\n<h2 class=\"vm-section__title\" id=\"trending\">Vibration Trending: What to Track and How<\/h2>\n\n<p>Collecting data without tracking changes over time is pointless. Vibration trending means comparing each reading to a baseline and to previous readings \u2014 to see whether the machine is getting better, worse, or staying the same.<\/p>\n\n<h3 class=\"vm-h3\">Establishing a baseline<\/h3>\n\n<p>Every machine needs a reference point. Record baseline vibration under stable, documented conditions: steady speed, normal load, stable temperature. For new machines, measure after commissioning. After overhaul, allow a short run-in period (24\u201372 hours) before locking the baseline \u2014 vibration may shift during bedding-in as bearings seat and components settle.<\/p>\n\n<p>Record the operating conditions with the vibration data. A vibration reading without RPM, load, and temperature context is almost useless \u2014 you can't compare a reading taken at 60% load to one taken at 100% load.<\/p>\n\n<h3 class=\"vm-h3\">What to track: three layers<\/h3>\n\n<p><strong>Layer 1 \u2014 Overall RMS velocity (mm\/s).<\/strong> The simplest and fastest check. Compare to ISO 10816 zone boundaries (see table below). A single number that tells you \"good, acceptable, investigate, or act now.\" Use this for route efficiency \u2014 it takes 30 seconds per measurement point.<\/p>\n\n<p><strong>Layer 2 \u2014 Key frequency components.<\/strong> When the overall level rises, you need to know <em>why<\/em>. Track the 1\u00d7 RPM component (unbalance, looseness, buildup), the 2\u00d7 RPM component (misalignment, coupling), and the high-frequency band (bearing defects). The Balanset-1A FFT spectrum shows all of these.<\/p>\n\n<p><strong>Layer 3 \u2014 Rate of change.<\/strong> The growth rate matters as much as the absolute level. A machine at 4.5 mm\/s that's been stable for 12 months is different from a machine at 4.5 mm\/s that was at 2.0 mm\/s three weeks ago. Rapid acceleration means fast-developing fault \u2014 shorten the interval and plan action immediately. Slow linear growth supports planned maintenance at the next convenient window.<\/p>\n\n<figure class=\"vm-image\">\n <img decoding=\"async\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2024\/04\/IMG_9157-scaled.jpg\"\n alt=\"Portable vibration measurement and on-site balancing with Balanset-1A on industrial fan\"\n loading=\"lazy\" width=\"1200\" height=\"800\">\n <figcaption class=\"vm-image__caption\">Periodic vibration measurement during a route round. When the data confirms unbalance, the same instrument switches to balancing mode \u2014 no second device needed.<\/figcaption>\n<\/figure>\n\n<div class=\"vm-callout vm-callout--warn\">\n <div class=\"vm-callout__label\">The most common trending mistake<\/div>\n <p class=\"vm-callout__text\">Comparing readings taken under different conditions. A fan measured at 50% damper opening reads differently than at 100%. A pump measured with a closed discharge valve reads differently than under load. <strong>Always record and match operating conditions.<\/strong> If conditions changed, flag the data point \u2014 don't trend it as if nothing happened.<\/p>\n<\/div>\n\n\n<div class=\"vm-cta\">\n <div>\n <h3 class=\"vm-cta__title\">Measure on the route. Balance on the spot.<\/h3>\n <p class=\"vm-cta__text\">Balanset-1A: vibration meter + FFT spectrum + 2-plane balancing. One device for monitoring and correction. No second trip to fetch a balancer.<\/p>\n <\/div>\n <div class=\"vm-cta__actions\">\n <a href=\"https:\/\/vibromera.eu\/product\/balanset-1\/\" class=\"vm-btn vm-btn--primary\" target=\"_blank\" rel=\"noopener\">Order Balanset-1A \u2014 \u20ac1,975<\/a>\n <a href=\"https:\/\/wa.me\/37258364849\" class=\"vm-btn vm-btn--whatsapp\" target=\"_blank\" rel=\"noopener\">Ask an engineer (WhatsApp)<\/a>\n <\/div>\n<\/div>\n\n\n<h2 class=\"vm-section__title\" id=\"triggers\">When to Rebalance: 4 Condition-Based Triggers<\/h2>\n\n<p>Balancing is not a calendar task. Do not schedule balancing \"every 6 months\" or \"every year\" without evidence. Balance when the data says so \u2014 and only when you've confirmed that unbalance is the dominant fault.<\/p>\n\n<div class=\"vm-trigger-grid\">\n <div class=\"vm-trigger-card\">\n <div class=\"vm-trigger-card__num\">1<\/div>\n <div>\n <div class=\"vm-trigger-card__title\">1\u00d7 RPM exceeds your limit<\/div>\n <p class=\"vm-trigger-card__text\">FFT spectrum shows a dominant 1\u00d7 peak that's crossed your plant's action threshold (or is trending toward it). Overall vibration entering ISO Zone C or D. This is the primary trigger.<\/p>\n <\/div>\n <\/div>\n <div class=\"vm-trigger-card\">\n <div class=\"vm-trigger-card__num\">2<\/div>\n <div>\n <div class=\"vm-trigger-card__title\">After maintenance that changes mass<\/div>\n <p class=\"vm-trigger-card__text\">Impeller replacement, blade repair, rotor machining, coupling change, motor rewind \u2014 any work that alters mass distribution or rotor geometry. Rebalance after reassembly.<\/p>\n <\/div>\n <\/div>\n <div class=\"vm-trigger-card\">\n <div class=\"vm-trigger-card__num\">3<\/div>\n <div>\n <div class=\"vm-trigger-card__title\">Process buildup or erosion<\/div>\n <p class=\"vm-trigger-card__text\">Fans handling dust, wet product, or corrosive gas accumulate or lose material over time. When trending shows 1\u00d7 climbing, clean and rebalance. Some environments need this every 3\u20136 months; others run years without change.<\/p>\n <\/div>\n <\/div>\n <div class=\"vm-trigger-card\">\n <div class=\"vm-trigger-card__num\">4<\/div>\n <div>\n <div class=\"vm-trigger-card__title\">Component loss or damage<\/div>\n <p class=\"vm-trigger-card__text\">A balance weight falls off, a blade erodes through, a coupling spider breaks. Sudden vibration increase at 1\u00d7 RPM with a known mechanical event. Rebalance after repairing the root cause.<\/p>\n <\/div>\n <\/div>\n<\/div>\n\n<div class=\"vm-callout vm-callout--success\">\n <div class=\"vm-callout__label\">What this means in practice<\/div>\n <p class=\"vm-callout__text\">A well-maintained fan in a clean environment may run 2\u20135 years between rebalances. A cement plant fan handling hot dusty gas may need cleaning and rebalancing every 3\u20134 months. The interval is not a fixed number \u2014 it's whatever the data shows for <em>your<\/em> specific machine in <em>your<\/em> specific process.<\/p>\n<\/div>\n\n\n<h2 class=\"vm-section__title\" id=\"quick-return\">Why Vibration Returns Soon After Balancing<\/h2>\n\n<p>If vibration comes back within days or weeks after a balance job, don't rebalance again \u2014 investigate. Recurring vibration means balancing is addressing a symptom, not the root cause.<\/p>\n\n<p><strong>Dirty rotor.<\/strong> Deposits shift or flake off, destroying the balance. If you balanced a dirty impeller, the correction weights compensated for the dirt. When the dirt moves, the weights become the new imbalance source. Solution: clean to bare metal before balancing.<\/p>\n\n<p><strong>Thermal distortion.<\/strong> The rotor bows or expands unevenly when hot, shifting the mass distribution. A motor balanced cold at 20\u00b0C winding temperature may vibrate badly at 80\u00b0C. Solution: balance at operating temperature.<\/p>\n\n<p><strong>Loose fits.<\/strong> The rotor shifts on the shaft, the hub slips, or a key loosens during starts and stops. Each start changes the position slightly, so the balance changes too. Solution: fix the mechanical fit before balancing.<\/p>\n\n<p><strong>Resonance.<\/strong> Running speed near a structural natural frequency amplifies small residual imbalance. The machine appears to \"need rebalancing\" constantly because tiny mass changes (thermal growth, deposit shifts) get amplified. Solution: change the speed or modify the structure to move the natural frequency \u2014 see our <a href=\"https:\/\/vibromera.eu\/vibration-isolation-guide\/\">vibration isolation guide<\/a>.<\/p>\n\n\n<h2 class=\"vm-section__title\" id=\"field-report\">Field Report: 14 Months Between Balances<\/h2>\n\n<p>A food processing plant in Central Europe had four identical 30 kW centrifugal fans on a drying line, each running at 2,920 RPM. The maintenance team was rebalancing all four every 3 months \u2014 a technician came in for a full day, balanced each fan, and left. Twelve visits per year across four fans.<\/p>\n\n<p>We set up a monthly monitoring route using the Balanset-1A in vibrometer mode. The first three months of data showed: Fan 1 and Fan 3 were stable at 1.8\u20132.2 mm\/s overall (Zone A\/B, no action needed). Fan 2 was climbing slowly \u2014 2.4 \u2192 3.1 \u2192 3.8 mm\/s \u2014 with a rising 1\u00d7 component indicating unbalance from product buildup on the impeller blades. Fan 4 had a strong 2\u00d7 component suggesting coupling misalignment, not unbalance at all.<\/p>\n\n<p>Result: we balanced Fan 2 (after cleaning) and aligned Fan 4's coupling. Fans 1 and 3 were left untouched. Fourteen months later, Fans 1 and 3 still don't need balancing \u2014 they're at 2.0 and 2.3 mm\/s respectively.<\/p>\n\n<div class=\"vm-field-report\">\n <div class=\"vm-field-report__tag\">Field data \u2014 condition-based monitoring<\/div>\n <h3 class=\"vm-field-report__title\">4 \u00d7 30 kW drying fans, 2,920 RPM \u2014 food processing plant<\/h3>\n <p class=\"vm-field-report__text\">Previous approach: calendar-based quarterly rebalancing of all 4 fans (12 visits\/year). New approach: monthly monitoring route, balance only when data confirms unbalance.<\/p>\n <div class=\"vm-field-report__stats\">\n <div class=\"vm-field-report__stat\">\n <div class=\"vm-field-report__stat-value\">12\u21923<\/div>\n <div class=\"vm-field-report__stat-label\">visits\/year (75% fewer)<\/div>\n <\/div>\n <div class=\"vm-field-report__stat\">\n <div class=\"vm-field-report__stat-value\">14 mo<\/div>\n <div class=\"vm-field-report__stat-label\">Fan 1 & 3 still stable<\/div>\n <\/div>\n <div class=\"vm-field-report__stat\">\n <div class=\"vm-field-report__stat-value\">3.8\u21921.2<\/div>\n <div class=\"vm-field-report__stat-label\">Fan 2 mm\/s (after balance)<\/div>\n <\/div>\n <div class=\"vm-field-report__stat\">\n <div class=\"vm-field-report__stat-value\">\u20ac4,200<\/div>\n <div class=\"vm-field-report__stat-label\">saved\/year in service visits<\/div>\n <\/div>\n <\/div>\n<\/div>\n\n<p>The savings came from stopping unnecessary work. Two fans didn't need balancing at all. One needed alignment, not balancing. Only one actually had an unbalance problem. Monthly monitoring with a portable instrument cost 30 minutes per visit \u2014 the data told the team exactly which machine needed what, and when.<\/p>\n\n\n<h2 class=\"vm-section__title\" id=\"iso\">ISO 10816 Severity Reference<\/h2>\n\n<p>ISO 10816-3 provides vibration severity zones for industrial machines with power ratings between 15 kW and 300 kW. Use these as reference thresholds for your trending program. Your plant may set tighter limits based on experience.<\/p>\n\n<div class=\"vm-table-wrap\">\n<table class=\"vm-table\">\n <thead><tr><th>Zone<\/th><th>Vibration (mm\/s RMS)<\/th><th>Condition<\/th><th>Recommended action<\/th><\/tr><\/thead>\n <tbody>\n <tr><td class=\"vm-table__accent\">A<\/td><td>0 \u2013 2.8<\/td><td>New or recently overhauled<\/td><td>No action needed \u2014 continue monitoring at normal interval<\/td><\/tr>\n <tr><td class=\"vm-table__accent\">B<\/td><td>2.8 \u2013 7.1<\/td><td>Acceptable for long-term operation<\/td><td>Monitor \u2014 normal trending interval applies<\/td><\/tr>\n <tr><td class=\"vm-table__accent\">C<\/td><td>7.1 \u2013 11.2<\/td><td>Restricted, limited operation<\/td><td>Investigate and plan corrective action \u2014 shorten monitoring interval<\/td><\/tr>\n <tr><td class=\"vm-table__accent\">D<\/td><td>> 11.2<\/td><td>Damage imminent<\/td><td>Take immediate action \u2014 machine damage likely if continued<\/td><\/tr>\n <\/tbody>\n<\/table>\n<\/div>\n\n<p>These values apply to Group 2 machines (15\u2013300 kW) on rigid foundations. For Group 1 (>300 kW) and flexible foundations, thresholds differ \u2014 consult the full standard. The key point: Zone A\/B = monitor normally. Zone C = investigate and plan. Zone D = act now.<\/p>\n\n<div class=\"vm-data-grid\">\n <div class=\"vm-data-card\">\n <div class=\"vm-data-card__value\">2.8<\/div>\n <div class=\"vm-data-card__label\">mm\/s \u2014 Zone A\/B boundary<\/div>\n <\/div>\n <div class=\"vm-data-card\">\n <div class=\"vm-data-card__value\">7.1<\/div>\n <div class=\"vm-data-card__label\">mm\/s \u2014 Zone B\/C boundary<\/div>\n <\/div>\n <div class=\"vm-data-card\">\n <div class=\"vm-data-card__value\">11.2<\/div>\n <div class=\"vm-data-card__label\">mm\/s \u2014 Zone C\/D boundary<\/div>\n <\/div>\n <div class=\"vm-data-card\">\n <div class=\"vm-data-card__value\">\u00bd<\/div>\n <div class=\"vm-data-card__label\">\u00d7 lead time = monitoring interval<\/div>\n <\/div>\n<\/div>\n\n\n<h2 class=\"vm-section__title\" id=\"faq\">Frequently Asked Questions<\/h2>\n<div class=\"vm-faq\">\n <div class=\"vm-faq-item\"><button class=\"vm-faq-item__q\" aria-expanded=\"false\"><span>How often should I check vibration on rotating equipment?<\/span><svg class=\"vm-faq-item__icon\" width=\"22\" height=\"22\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><line x1=\"12\" y1=\"5\" x2=\"12\" y2=\"19\"\/><line x1=\"5\" y1=\"12\" x2=\"19\" y2=\"12\"\/><\/svg><\/button><div class=\"vm-faq-item__a\"><div class=\"vm-faq-item__a-inner\">It depends on criticality. Critical machines: continuous or weekly. Essential equipment: monthly. General-purpose: quarterly. The interval should be shorter than half the time from first detectable fault to failure. When trending shows a developing issue, increase frequency immediately.<\/div><\/div><\/div>\n <div class=\"vm-faq-item\"><button class=\"vm-faq-item__q\" aria-expanded=\"false\"><span>When should I rebalance a rotor?<\/span><svg class=\"vm-faq-item__icon\" width=\"22\" height=\"22\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><line x1=\"12\" y1=\"5\" x2=\"12\" y2=\"19\"\/><line x1=\"5\" y1=\"12\" x2=\"19\" y2=\"12\"\/><\/svg><\/button><div class=\"vm-faq-item__a\"><div class=\"vm-faq-item__a-inner\">When the 1\u00d7 RPM vibration exceeds your action threshold and diagnosis confirms unbalance. Also after any maintenance that changes mass distribution (impeller replacement, blade repair, motor rewind). Don't schedule balancing by calendar \u2014 let the data decide.<\/div><\/div><\/div>\n <div class=\"vm-faq-item\"><button class=\"vm-faq-item__q\" aria-expanded=\"false\"><span>What vibration level triggers action?<\/span><svg class=\"vm-faq-item__icon\" width=\"22\" height=\"22\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><line x1=\"12\" y1=\"5\" x2=\"12\" y2=\"19\"\/><line x1=\"5\" y1=\"12\" x2=\"19\" y2=\"12\"\/><\/svg><\/button><div class=\"vm-faq-item__a\"><div class=\"vm-faq-item__a-inner\">ISO 10816-3 for Group 2 machines (15\u2013300 kW, rigid): Zone A up to 2.8 mm\/s (good), Zone B 2.8\u20137.1 (acceptable), Zone C 7.1\u201311.2 (investigate), Zone D above 11.2 (act now). Many plants set tighter internal limits \u2014 particularly for precision equipment or sensitive installations.<\/div><\/div><\/div>\n <div class=\"vm-faq-item\"><button class=\"vm-faq-item__q\" aria-expanded=\"false\"><span>Why does vibration return soon after balancing?<\/span><svg class=\"vm-faq-item__icon\" width=\"22\" height=\"22\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><line x1=\"12\" y1=\"5\" x2=\"12\" y2=\"19\"\/><line x1=\"5\" y1=\"12\" x2=\"19\" y2=\"12\"\/><\/svg><\/button><div class=\"vm-faq-item__a\"><div class=\"vm-faq-item__a-inner\">Common causes: dirty rotor (deposits shift\/fall off), thermal distortion (rotor bows when hot), loose fits (rotor shifts on shaft), or running near resonance (small residual imbalance gets amplified). Investigate the root cause instead of rebalancing repeatedly.<\/div><\/div><\/div>\n <div class=\"vm-faq-item\"><button class=\"vm-faq-item__q\" aria-expanded=\"false\"><span>Can I use a portable instrument instead of permanent monitoring?<\/span><svg class=\"vm-faq-item__icon\" width=\"22\" height=\"22\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><line x1=\"12\" y1=\"5\" x2=\"12\" y2=\"19\"\/><line x1=\"5\" y1=\"12\" x2=\"19\" y2=\"12\"\/><\/svg><\/button><div class=\"vm-faq-item__a\"><div class=\"vm-faq-item__a-inner\">Yes \u2014 for most equipment. Portable route-based monitoring with the Balanset-1A covers vibration measurement, spectrum analysis, and on-site balancing. Permanent monitoring is only justified for critical assets where faults develop very fast or access is restricted.<\/div><\/div><\/div>\n <div class=\"vm-faq-item\"><button class=\"vm-faq-item__q\" aria-expanded=\"false\"><span>What's the difference between in-situ and workshop balancing?<\/span><svg class=\"vm-faq-item__icon\" width=\"22\" height=\"22\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><line x1=\"12\" y1=\"5\" x2=\"12\" y2=\"19\"\/><line x1=\"5\" y1=\"12\" x2=\"19\" y2=\"12\"\/><\/svg><\/button><div class=\"vm-faq-item__a\"><div class=\"vm-faq-item__a-inner\">Workshop balancing uses a balancing machine during manufacturing or overhaul. In-situ balancing uses a portable instrument (like the Balanset-1A) on the assembled machine. In-situ accounts for real bearing conditions, assembly tolerances, and actual support stiffness \u2014 factors the workshop machine can't replicate.<\/div><\/div><\/div>\n<\/div>\n\n\n<aside class=\"vm-author\" itemscope itemtype=\"https:\/\/schema.org\/Person\">\n <div class=\"vm-author__avatar\" aria-hidden=\"true\">NS<\/div>\n <div>\n <div class=\"vm-author__name\" itemprop=\"name\">Nikolai Shelkovenko<\/div>\n <div class=\"vm-author__role\"><span itemprop=\"jobTitle\">Vibration Analysis Engineer<\/span>, <span itemprop=\"worksFor\">Vibromera<\/span><\/div>\n <p class=\"vm-author__bio\" itemprop=\"description\">15+ years of field experience in vibration monitoring, trending, and on-site balancing across industrial, agricultural, and marine equipment. Developer of the Balanset-1A. Based in Porto, Portugal. Questions: <a href=\"https:\/\/wa.me\/37258364849\" target=\"_blank\" rel=\"noopener\">WhatsApp<\/a>.<\/p>\n <\/div>\n<\/aside>\n\n\n<div class=\"vm-cta\" style=\"margin-bottom:80px;\">\n <div>\n <h3 class=\"vm-cta__title\">One instrument. Monitor, diagnose, balance.<\/h3>\n <p class=\"vm-cta__text\">Balanset-1A: vibration meter + FFT spectrum + 2-plane balancing in a 4 kg case. Measure on the route, balance on the spot when needed. DHL worldwide. 2-year warranty. No subscriptions.<\/p>\n <\/div>\n <div class=\"vm-cta__actions\">\n <a href=\"https:\/\/vibromera.eu\/product\/balanset-1\/\" class=\"vm-btn vm-btn--primary\" target=\"_blank\" rel=\"noopener\">Order \u2014 \u20ac1,975<\/a>\n <a href=\"https:\/\/vibromera.eu\/guide-to-field-rotor-balancing-using-balanset-1a-instruments-theory-practice-and-problem-solving\/\" class=\"vm-btn vm-btn--outline\" target=\"_blank\" rel=\"noopener\">Read the full balancing guide<\/a>\n <\/div>\n<\/div>\n\n<\/div>\n<\/article>\n\n<script>\n(function(){\n 'use strict';\n document.querySelectorAll('.vm-faq-item__q').forEach(function(b){\n b.addEventListener('click',function(){\n var i=this.closest('.vm-faq-item'),o=i.classList.contains('is-open');\n document.querySelectorAll('.vm-faq-item').forEach(function(e){e.classList.remove('is-open');e.querySelector('.vm-faq-item__q').setAttribute('aria-expanded','false');});\n if(!o){i.classList.add('is-open');this.setAttribute('aria-expanded','true');}\n });\n });\n document.querySelectorAll('.vm-toc__list a').forEach(function(a){\n a.addEventListener('click',function(e){var t=document.querySelector(this.getAttribute('href'));if(t){e.preventDefault();window.scrollTo({top:t.getBoundingClientRect().top+window.pageYOffset-24,behavior:'smooth'});}});\n });\n})();\n<\/script>\n<\/body>\n<\/html><\/div><\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Vibration Monitoring Intervals and Balancing Schedules for Rotating Equipment | Vibromera Home\u203a Knowledge Base\u203a Monitoring Intervals Predictive Maintenance How Often to Check Vibration \u2014 and When That Check Should Become a Balance Job Check too rarely and you miss the window. Check too often and you waste hours on healthy […]<\/p>\n","protected":false},"author":2,"featured_media":3900,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ai_generated_summary":"","footnotes":""},"categories":[9,4,5,54],"tags":[],"class_list":["post-21166","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-rotors","category-example","category-solutions","category-content"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/posts\/21166","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/comments?post=21166"}],"version-history":[{"count":3,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/posts\/21166\/revisions"}],"predecessor-version":[{"id":21279,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/posts\/21166\/revisions\/21279"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/media\/3900"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/media?parent=21166"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/categories?post=21166"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/tags?post=21166"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}

\n\n\n\n\n\nVibration Monitoring Intervals and Balancing Schedules for Rotating Equipment | Vibromera<\/title>\n<meta name=\"description\" content=\"How often to check vibration: risk-based intervals, trending methods, condition-based balancing triggers. ISO 17359 criticality approach. Field case: 14 months without rebalance.\">\n<meta name=\"keywords\" content=\"how often to check vibration, vibration monitoring frequency, vibration trending, when to rebalance rotor, vibration monitoring intervals, condition based maintenance, predictive maintenance vibration, ISO 17359, ISO 10816, Balanset-1A\">\n<meta name=\"author\" content=\"Nikolai Shelkovenko\">\n<meta name=\"robots\" content=\"index, follow, max-image-preview:large, max-snippet:-1\">\n\n\n\n<meta property=\"og:type\" content=\"article\">\n<meta property=\"og:url\" content=\"https:\/\/vibromera.eu\/vibration-monitoring-intervals\/\">\n<meta property=\"og:title\" content=\"Vibration Monitoring Intervals and Balancing Schedules\">\n<meta property=\"og:description\" content=\"How often to measure vibration on rotating equipment. Risk-based intervals, trending, condition-based rebalancing. Field data included.\">\n<meta property=\"og:image\" content=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/04\/IMG_20180419_115503_HDR-e1558697914761.jpg\">\n<meta property=\"og:site_name\" content=\"Vibromera\">\n<meta property=\"og:locale\" content=\"en_US\">\n<meta property=\"article:author\" content=\"Nikolai Shelkovenko\">\n<meta property=\"article:published_time\" content=\"2025-03-15T08:00:00+00:00\">\n<meta property=\"article:modified_time\" content=\"2025-06-10T10:00:00+00:00\">\n<meta property=\"article:section\" content=\"Technical Guides\">\n<meta property=\"article:tag\" content=\"vibration monitoring\">\n<meta property=\"article:tag\" content=\"predictive maintenance\">\n<meta property=\"article:tag\" content=\"condition based maintenance\">\n\n\n<meta name=\"twitter:card\" content=\"summary_large_image\">\n<meta name=\"twitter:title\" content=\"How Often to Check Vibration and When to Rebalance\">\n<meta name=\"twitter:description\" content=\"Risk-based monitoring intervals, vibration trending methods, condition-based balancing triggers. 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Vibration meter, FFT spectrum, trending, and 1- or 2-plane balancing in one device.\",\n \"brand\": {\n \"@type\": \"Brand\",\n \"name\": \"Vibromera\"\n },\n \"manufacturer\": {\n \"@id\": \"https:\/\/vibromera.eu\/#organization\"\n },\n \"offers\": {\n \"@type\": \"Offer\",\n \"url\": \"https:\/\/vibromera.eu\/product\/balanset-1\/\",\n \"priceCurrency\": \"EUR\",\n \"price\": \"1975\",\n \"availability\": \"https:\/\/schema.org\/InStock\",\n \"itemCondition\": \"https:\/\/schema.org\/NewCondition\",\n \"priceValidUntil\": \"2026-12-31\"\n },\n \"additionalProperty\": [\n {\n \"@type\": \"PropertyValue\",\n \"name\": \"Channels\",\n \"value\": \"2\"\n },\n {\n \"@type\": \"PropertyValue\",\n \"name\": \"Vibration range\",\n \"value\": \"0.02\u201380 mm\/s\"\n },\n {\n \"@type\": \"PropertyValue\",\n \"name\": \"Frequency range\",\n \"value\": \"5\u2013550 Hz\"\n },\n {\n \"@type\": \"PropertyValue\",\n \"name\": \"RPM range\",\n \"value\": \"100\u2013100,000\"\n },\n {\n \"@type\": \"PropertyValue\",\n \"name\": \"Phase accuracy\",\n \"value\": \"\u00b11\u00b0\"\n },\n {\n \"@type\": \"PropertyValue\",\n \"name\": \"Balancing planes\",\n \"value\": \"1 or 2\"\n },\n {\n \"@type\": \"PropertyValue\",\n \"name\": \"Weight with case\",\n \"value\": \"4 kg\"\n },\n {\n \"@type\": \"PropertyValue\",\n \"name\": \"Software license\",\n \"value\": \"Lifetime, included\"\n },\n {\n \"@type\": \"PropertyValue\",\n \"name\": \"Warranty\",\n \"value\": \"2 years\"\n }\n ]\n}<\/script>\n\n<script type=\"application\/ld+json\">\n{\n \"@context\": \"https:\/\/schema.org\",\n \"@type\": \"FAQPage\",\n \"mainEntity\": [\n {\n \"@type\": \"Question\",\n \"name\": \"How often should I check vibration on rotating equipment?\",\n \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"It depends on criticality. Critical machines (safety risk, plant shutdown): continuous online monitoring or weekly portable checks. Essential equipment (production bottleneck): monthly. General-purpose (redundant units): quarterly. The interval should be shorter than half the expected time from first detectable fault to failure.\" }\n },\n {\n \"@type\": \"Question\",\n \"name\": \"When should I rebalance a rotor?\",\n \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"Rebalance when the 1\u00d7 RPM vibration component exceeds your plant's acceptable limit and diagnosis confirms unbalance as the dominant fault. Also rebalance after any maintenance that changes mass distribution: impeller replacement, blade repair, coupling change, motor rewind. Do not schedule balancing on a calendar \u2014 it's a condition-based action.\" }\n },\n {\n \"@type\": \"Question\",\n \"name\": \"What vibration level triggers action?\",\n \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"ISO 10816-3 provides zone boundaries for industrial machinery. Zone A (new\/good): up to 2.8 mm\/s. Zone B (acceptable for long-term): 2.8\u20137.1 mm\/s. Zone C (limited operation): 7.1\u201311.2 mm\/s. Zone D (damage imminent): above 11.2 mm\/s. These are overall RMS velocity for Group 2 machines (15\u2013300 kW, rigid foundation). Your plant may set tighter limits.\" }\n },\n {\n \"@type\": \"Question\",\n \"name\": \"Why does vibration return soon after balancing?\",\n \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"Three common causes: (1) Dirty rotor \u2014 deposits shift or fall off, destroying the balance. (2) Thermal distortion \u2014 the rotor bows when hot, changing mass distribution. (3) Loose fit \u2014 the rotor or components shift on the shaft during starts. If vibration returns within weeks, investigate the root cause rather than rebalancing repeatedly.\" }\n },\n {\n \"@type\": \"Question\",\n \"name\": \"Can I use a portable instrument instead of permanent monitoring?\",\n \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"Yes, for most equipment. Portable instruments like the Balanset-1A are standard for periodic route-based monitoring. They cover vibration measurement, trending, and on-site balancing. Permanent monitoring is justified for critical machines where failure consequences are severe, faults develop fast, or access is restricted.\" }\n },\n {\n \"@type\": \"Question\",\n \"name\": \"What's the difference between in-situ and workshop balancing?\",\n \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"Workshop balancing is done on a balancing machine during manufacturing or overhaul. In-situ balancing is done on the assembled machine in the field, using a portable instrument like the Balanset-1A. 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border:1.5px solid var(--vm-border-strong); }\n.vm-btn--outline:hover { background:var(--vm-paper-cool); text-decoration:none; }\n.vm-btn--whatsapp { background:#25D366; color:#fff; }\n.vm-btn--whatsapp:hover { background:#1ebe5d; transform:translateY(-1px); color:#fff; text-decoration:none; }\n\n\/* === AUTHOR === *\/\n.vm-author { margin:52px 0 40px; padding:26px 28px; background:var(--vm-paper-warm); border:1px solid var(--vm-border); border-radius:10px; display:flex; gap:18px; align-items:flex-start; }\n.vm-author__avatar { width:52px; height:52px; border-radius:14px; background:var(--vm-anthracite); color:#fff; display:flex; align-items:center; justify-content:center; font-weight:700; font-size:17px; flex-shrink:0; }\n.vm-author__name { font-weight:700; color:var(--vm-ink); font-size:17px; }\n.vm-author__role { font-size:14px; color:var(--vm-ink-muted); margin-bottom:6px; }\n.vm-author__bio { font-size:15px; line-height:1.6; color:var(--vm-ink-soft); margin:0; }\n\n\/* === MOBILE === *\/\n@media (max-width:640px) {\n .vm-article { font-size:16px; }\n .vm-hero__inner { padding:50px var(--vm-gutter) 36px; }\n .vm-hero__title { font-size:24px; }\n .vm-hero__lead { font-size:16px; }\n .vm-toc { padding:18px; }\n .vm-section__title { font-size:22px; margin-top:48px; }\n .vm-h3 { font-size:18px; }\n .vm-field-report { padding:24px 18px; }\n .vm-field-report__title { font-size:20px; }\n .vm-cta { padding:24px 18px; }\n .vm-cta__title { font-size:21px; }\n .vm-author { flex-direction:column; }\n .vm-faq-item__q { padding:14px 16px; font-size:16px; }\n .vm-callout { padding:16px 18px; }\n .vm-container { padding:0 16px; }\n .vm-data-card__value { font-size:22px; }\n}\n@media print {\n .vm-hero { min-height:auto; }\n .vm-hero__bg { display:none; }\n .vm-hero__overlay { display:none; }\n .vm-hero__title, .vm-hero__lead { color:#000; }\n .vm-field-report { background:#eee !important; color:#000; }\n}\n<\/style>\n<\/head>\n<body>\n<article class=\"vm-article\" itemscope itemtype=\"https:\/\/schema.org\/TechArticle\">\n\n\n<header class=\"vm-hero\">\n <div class=\"vm-hero__bg\">\n <img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/04\/IMG_20180419_115503_HDR-e1558697914761.jpg\"\n alt=\"Portable vibration measurement on industrial rotating equipment using Balanset-1A\"\n loading=\"eager\" width=\"1200\" height=\"800\">\n <\/div>\n <div class=\"vm-hero__overlay\"><\/div>\n <div class=\"vm-hero__inner\">\n <nav class=\"vm-hero__breadcrumb\" aria-label=\"Breadcrumb\">\n <a href=\"https:\/\/vibromera.eu\/\">Home<\/a><span class=\"vm-hero__breadcrumb-sep\">\u203a<\/span>\n <a href=\"https:\/\/vibromera.eu\/knowledge-base\/\">Knowledge Base<\/a><span class=\"vm-hero__breadcrumb-sep\">\u203a<\/span>\n <span>Monitoring Intervals<\/span>\n <\/nav>\n <div class=\"vm-hero__tag\">Predictive Maintenance<\/div>\n <h1 class=\"vm-hero__title\" itemprop=\"headline\">How Often to Check Vibration \u2014 and When That Check Should Become a Balance Job<\/h1>\n <p class=\"vm-hero__lead\" itemprop=\"description\">Check too rarely and you miss the window. Check too often and you waste hours on healthy machines. Here's how to set the right interval, track what matters, and know exactly when a rotor needs rebalancing.<\/p>\n <div class=\"vm-hero__meta\">\n <span class=\"vm-hero__meta-item\" itemprop=\"author\" itemscope itemtype=\"https:\/\/schema.org\/Person\">By <strong style=\"color:rgba(255,255,255,0.52); margin-left:4px;\" itemprop=\"name\">Nikolai Shelkovenko<\/strong><\/span>\n <span class=\"vm-hero__meta-divider\"><\/span>\n <span class=\"vm-hero__meta-item\"><time itemprop=\"datePublished\" datetime=\"2025-03-15\">Mar 15, 2025<\/time><\/span>\n <span class=\"vm-hero__meta-divider\"><\/span>\n <span class=\"vm-hero__meta-item\">Updated <time itemprop=\"dateModified\" datetime=\"2025-06-10\">Jun 2025<\/time><\/span>\n <span class=\"vm-hero__meta-divider\"><\/span>\n <span class=\"vm-hero__meta-item\">12 min read<\/span>\n <\/div>\n <\/div>\n<\/header>\n\n\n<div class=\"vm-container\">\n<nav class=\"vm-toc\" aria-label=\"Table of contents\">\n <div class=\"vm-toc__title\">In this guide<\/div>\n <ol class=\"vm-toc__list\">\n <li><a href=\"#intervals\">Setting the Right Monitoring Interval<\/a><\/li>\n <li><a href=\"#approaches\">Continuous vs Periodic: Two Approaches, One Goal<\/a><\/li>\n <li><a href=\"#trending\">Vibration Trending: What to Track and How<\/a><\/li>\n <li><a href=\"#triggers\">When to Rebalance: 4 Condition-Based Triggers<\/a><\/li>\n <li><a href=\"#quick-return\">Why Vibration Returns Soon After Balancing<\/a><\/li>\n <li><a href=\"#field-report\">Field Report: 14 Months Between Balances<\/a><\/li>\n <li><a href=\"#iso\">ISO 10816 Severity Reference<\/a><\/li>\n <li><a href=\"#faq\">Frequently Asked Questions<\/a><\/li>\n <\/ol>\n<\/nav>\n\n\n<h2 class=\"vm-section__title\" id=\"intervals\">Setting the Right Monitoring Interval<\/h2>\n\n<p>There is no universal schedule. \"Monthly\" is not always right. \"Quarterly\" is not always wrong. The correct interval depends on one thing: <strong>how fast can a fault develop from first detectable symptom to functional failure?<\/strong> ISO 17359 calls this the \"lead time to failure.\"<\/p>\n\n<p>The rule is simple: measure at intervals shorter than half the lead time to failure. If a bearing typically takes two months from first spalling to seizure, measure at least monthly. If a fan impeller accumulates enough dust to shift vibration in three weeks, check every 10 days. The half-interval rule gives you at least two data points in the fault development window \u2014 enough to see the trend and plan action before failure.<\/p>\n\n<div class=\"vm-callout vm-callout--info\">\n <div class=\"vm-callout__label\">The core principle<\/div>\n <p class=\"vm-callout__text\">Monitoring interval = <strong>\u00bd \u00d7 lead time to failure<\/strong>. If you don't know the lead time, start monthly and tighten the interval when trending data shows how fast faults develop on your specific equipment.<\/p>\n<\/div>\n\n<h3 class=\"vm-h3\">Risk-based interval selection<\/h3>\n\n<p>ISO 17359 provides a criticality framework. Start with these intervals, then adjust based on what your data actually shows.<\/p>\n\n<div class=\"vm-table-wrap\">\n<table class=\"vm-table\">\n <thead><tr><th>Criticality<\/th><th>Description<\/th><th>Starting interval<\/th><th>Examples<\/th><\/tr><\/thead>\n <tbody>\n <tr><td class=\"vm-table__accent\">Critical<\/td><td>Safety risk, plant shutdown, environmental impact<\/td><td>Continuous or weekly<\/td><td>Main compressors, boiler fans, turbines<\/td><\/tr>\n <tr><td class=\"vm-table__accent\">Essential<\/td><td>Production bottleneck, long spare lead time<\/td><td>Monthly<\/td><td>Process pumps, cooling towers, key HVAC<\/td><\/tr>\n <tr><td class=\"vm-table__accent\">General purpose<\/td><td>Redundant units, manageable repair impact<\/td><td>Quarterly<\/td><td>Standby pumps, warehouse ventilation<\/td><\/tr>\n <tr><td class=\"vm-table__accent\">Run-to-failure<\/td><td>Low cost, non-critical, quick replacement<\/td><td>Visual \/ audible only<\/td><td>Small exhaust fans, fractional-HP motors<\/td><\/tr>\n <\/tbody>\n<\/table>\n<\/div>\n\n<p>These are starting points. The moment you detect a change \u2014 a vibration level creeping up, a new frequency appearing in the spectrum \u2014 increase measurement frequency immediately. A machine that was \"quarterly\" becomes \"weekly\" the moment it shows a developing fault.<\/p>\n\n\n<h2 class=\"vm-section__title\" id=\"approaches\">Continuous vs Periodic: Two Approaches, One Goal<\/h2>\n\n<div class=\"vm-approach-grid\">\n <div class=\"vm-approach-card\">\n <h3 class=\"vm-approach-card__title\">Continuous online monitoring<\/h3>\n <div class=\"vm-approach-card__meta\">Permanently installed sensors \u00b7 Near real-time analysis<\/div>\n <p class=\"vm-approach-card__text\">Use when failure consequences are severe (safety, environment, total plant shutdown), when faults develop fast (hours to days), or when equipment is physically inaccessible (hazardous areas, remote sites, offshore). Requires wired or wireless sensor infrastructure, data acquisition, and analysis software. Higher capital cost, but catches fast-developing faults that periodic routes would miss.<\/p>\n <\/div>\n <div class=\"vm-approach-card\">\n <h3 class=\"vm-approach-card__title\">Periodic route-based monitoring<\/h3>\n <div class=\"vm-approach-card__meta\">Portable instrument \u00b7 Scheduled rounds \u00b7 Walk-around routes<\/div>\n <p class=\"vm-approach-card__text\">A technician collects data with a portable instrument during scheduled rounds. Fits most balance-of-plant equipment: fans, pumps, motors, compressors where redundancy exists and faults develop over weeks or months. The <a href=\"https:\/\/vibromera.eu\/product\/balanset-1\/\">Balanset-1A<\/a> works for both \u2014 vibration measurement during the monitoring round, and on-site balancing when the data says it's time.<\/p>\n <\/div>\n<\/div>\n\n<p>Most plants use both. Critical assets get online systems. Everything else gets periodic routes with a portable instrument. The key is matching the approach to the criticality and fault development speed \u2014 not choosing one method for the entire plant.<\/p>\n\n\n<h2 class=\"vm-section__title\" id=\"trending\">Vibration Trending: What to Track and How<\/h2>\n\n<p>Collecting data without tracking changes over time is pointless. Vibration trending means comparing each reading to a baseline and to previous readings \u2014 to see whether the machine is getting better, worse, or staying the same.<\/p>\n\n<h3 class=\"vm-h3\">Establishing a baseline<\/h3>\n\n<p>Every machine needs a reference point. Record baseline vibration under stable, documented conditions: steady speed, normal load, stable temperature. For new machines, measure after commissioning. After overhaul, allow a short run-in period (24\u201372 hours) before locking the baseline \u2014 vibration may shift during bedding-in as bearings seat and components settle.<\/p>\n\n<p>Record the operating conditions with the vibration data. A vibration reading without RPM, load, and temperature context is almost useless \u2014 you can't compare a reading taken at 60% load to one taken at 100% load.<\/p>\n\n<h3 class=\"vm-h3\">What to track: three layers<\/h3>\n\n<p><strong>Layer 1 \u2014 Overall RMS velocity (mm\/s).<\/strong> The simplest and fastest check. Compare to ISO 10816 zone boundaries (see table below). A single number that tells you \"good, acceptable, investigate, or act now.\" Use this for route efficiency \u2014 it takes 30 seconds per measurement point.<\/p>\n\n<p><strong>Layer 2 \u2014 Key frequency components.<\/strong> When the overall level rises, you need to know <em>why<\/em>. Track the 1\u00d7 RPM component (unbalance, looseness, buildup), the 2\u00d7 RPM component (misalignment, coupling), and the high-frequency band (bearing defects). The Balanset-1A FFT spectrum shows all of these.<\/p>\n\n<p><strong>Layer 3 \u2014 Rate of change.<\/strong> The growth rate matters as much as the absolute level. A machine at 4.5 mm\/s that's been stable for 12 months is different from a machine at 4.5 mm\/s that was at 2.0 mm\/s three weeks ago. Rapid acceleration means fast-developing fault \u2014 shorten the interval and plan action immediately. Slow linear growth supports planned maintenance at the next convenient window.<\/p>\n\n<figure class=\"vm-image\">\n <img decoding=\"async\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2024\/04\/IMG_9157-scaled.jpg\"\n alt=\"Portable vibration measurement and on-site balancing with Balanset-1A on industrial fan\"\n loading=\"lazy\" width=\"1200\" height=\"800\">\n <figcaption class=\"vm-image__caption\">Periodic vibration measurement during a route round. When the data confirms unbalance, the same instrument switches to balancing mode \u2014 no second device needed.<\/figcaption>\n<\/figure>\n\n<div class=\"vm-callout vm-callout--warn\">\n <div class=\"vm-callout__label\">The most common trending mistake<\/div>\n <p class=\"vm-callout__text\">Comparing readings taken under different conditions. A fan measured at 50% damper opening reads differently than at 100%. A pump measured with a closed discharge valve reads differently than under load. <strong>Always record and match operating conditions.<\/strong> If conditions changed, flag the data point \u2014 don't trend it as if nothing happened.<\/p>\n<\/div>\n\n\n<div class=\"vm-cta\">\n <div>\n <h3 class=\"vm-cta__title\">Measure on the route. Balance on the spot.<\/h3>\n <p class=\"vm-cta__text\">Balanset-1A: vibration meter + FFT spectrum + 2-plane balancing. One device for monitoring and correction. No second trip to fetch a balancer.<\/p>\n <\/div>\n <div class=\"vm-cta__actions\">\n <a href=\"https:\/\/vibromera.eu\/product\/balanset-1\/\" class=\"vm-btn vm-btn--primary\" target=\"_blank\" rel=\"noopener\">Order Balanset-1A \u2014 \u20ac1,975<\/a>\n <a href=\"https:\/\/wa.me\/37258364849\" class=\"vm-btn vm-btn--whatsapp\" target=\"_blank\" rel=\"noopener\">Ask an engineer (WhatsApp)<\/a>\n <\/div>\n<\/div>\n\n\n<h2 class=\"vm-section__title\" id=\"triggers\">When to Rebalance: 4 Condition-Based Triggers<\/h2>\n\n<p>Balancing is not a calendar task. Do not schedule balancing \"every 6 months\" or \"every year\" without evidence. Balance when the data says so \u2014 and only when you've confirmed that unbalance is the dominant fault.<\/p>\n\n<div class=\"vm-trigger-grid\">\n <div class=\"vm-trigger-card\">\n <div class=\"vm-trigger-card__num\">1<\/div>\n <div>\n <div class=\"vm-trigger-card__title\">1\u00d7 RPM exceeds your limit<\/div>\n <p class=\"vm-trigger-card__text\">FFT spectrum shows a dominant 1\u00d7 peak that's crossed your plant's action threshold (or is trending toward it). Overall vibration entering ISO Zone C or D. This is the primary trigger.<\/p>\n <\/div>\n <\/div>\n <div class=\"vm-trigger-card\">\n <div class=\"vm-trigger-card__num\">2<\/div>\n <div>\n <div class=\"vm-trigger-card__title\">After maintenance that changes mass<\/div>\n <p class=\"vm-trigger-card__text\">Impeller replacement, blade repair, rotor machining, coupling change, motor rewind \u2014 any work that alters mass distribution or rotor geometry. Rebalance after reassembly.<\/p>\n <\/div>\n <\/div>\n <div class=\"vm-trigger-card\">\n <div class=\"vm-trigger-card__num\">3<\/div>\n <div>\n <div class=\"vm-trigger-card__title\">Process buildup or erosion<\/div>\n <p class=\"vm-trigger-card__text\">Fans handling dust, wet product, or corrosive gas accumulate or lose material over time. When trending shows 1\u00d7 climbing, clean and rebalance. Some environments need this every 3\u20136 months; others run years without change.<\/p>\n <\/div>\n <\/div>\n <div class=\"vm-trigger-card\">\n <div class=\"vm-trigger-card__num\">4<\/div>\n <div>\n <div class=\"vm-trigger-card__title\">Component loss or damage<\/div>\n <p class=\"vm-trigger-card__text\">A balance weight falls off, a blade erodes through, a coupling spider breaks. Sudden vibration increase at 1\u00d7 RPM with a known mechanical event. Rebalance after repairing the root cause.<\/p>\n <\/div>\n <\/div>\n<\/div>\n\n<div class=\"vm-callout vm-callout--success\">\n <div class=\"vm-callout__label\">What this means in practice<\/div>\n <p class=\"vm-callout__text\">A well-maintained fan in a clean environment may run 2\u20135 years between rebalances. A cement plant fan handling hot dusty gas may need cleaning and rebalancing every 3\u20134 months. The interval is not a fixed number \u2014 it's whatever the data shows for <em>your<\/em> specific machine in <em>your<\/em> specific process.<\/p>\n<\/div>\n\n\n<h2 class=\"vm-section__title\" id=\"quick-return\">Why Vibration Returns Soon After Balancing<\/h2>\n\n<p>If vibration comes back within days or weeks after a balance job, don't rebalance again \u2014 investigate. Recurring vibration means balancing is addressing a symptom, not the root cause.<\/p>\n\n<p><strong>Dirty rotor.<\/strong> Deposits shift or flake off, destroying the balance. If you balanced a dirty impeller, the correction weights compensated for the dirt. When the dirt moves, the weights become the new imbalance source. Solution: clean to bare metal before balancing.<\/p>\n\n<p><strong>Thermal distortion.<\/strong> The rotor bows or expands unevenly when hot, shifting the mass distribution. A motor balanced cold at 20\u00b0C winding temperature may vibrate badly at 80\u00b0C. Solution: balance at operating temperature.<\/p>\n\n<p><strong>Loose fits.<\/strong> The rotor shifts on the shaft, the hub slips, or a key loosens during starts and stops. Each start changes the position slightly, so the balance changes too. Solution: fix the mechanical fit before balancing.<\/p>\n\n<p><strong>Resonance.<\/strong> Running speed near a structural natural frequency amplifies small residual imbalance. The machine appears to \"need rebalancing\" constantly because tiny mass changes (thermal growth, deposit shifts) get amplified. Solution: change the speed or modify the structure to move the natural frequency \u2014 see our <a href=\"https:\/\/vibromera.eu\/vibration-isolation-guide\/\">vibration isolation guide<\/a>.<\/p>\n\n\n<h2 class=\"vm-section__title\" id=\"field-report\">Field Report: 14 Months Between Balances<\/h2>\n\n<p>A food processing plant in Central Europe had four identical 30 kW centrifugal fans on a drying line, each running at 2,920 RPM. The maintenance team was rebalancing all four every 3 months \u2014 a technician came in for a full day, balanced each fan, and left. Twelve visits per year across four fans.<\/p>\n\n<p>We set up a monthly monitoring route using the Balanset-1A in vibrometer mode. The first three months of data showed: Fan 1 and Fan 3 were stable at 1.8\u20132.2 mm\/s overall (Zone A\/B, no action needed). Fan 2 was climbing slowly \u2014 2.4 \u2192 3.1 \u2192 3.8 mm\/s \u2014 with a rising 1\u00d7 component indicating unbalance from product buildup on the impeller blades. Fan 4 had a strong 2\u00d7 component suggesting coupling misalignment, not unbalance at all.<\/p>\n\n<p>Result: we balanced Fan 2 (after cleaning) and aligned Fan 4's coupling. Fans 1 and 3 were left untouched. Fourteen months later, Fans 1 and 3 still don't need balancing \u2014 they're at 2.0 and 2.3 mm\/s respectively.<\/p>\n\n<div class=\"vm-field-report\">\n <div class=\"vm-field-report__tag\">Field data \u2014 condition-based monitoring<\/div>\n <h3 class=\"vm-field-report__title\">4 \u00d7 30 kW drying fans, 2,920 RPM \u2014 food processing plant<\/h3>\n <p class=\"vm-field-report__text\">Previous approach: calendar-based quarterly rebalancing of all 4 fans (12 visits\/year). New approach: monthly monitoring route, balance only when data confirms unbalance.<\/p>\n <div class=\"vm-field-report__stats\">\n <div class=\"vm-field-report__stat\">\n <div class=\"vm-field-report__stat-value\">12\u21923<\/div>\n <div class=\"vm-field-report__stat-label\">visits\/year (75% fewer)<\/div>\n <\/div>\n <div class=\"vm-field-report__stat\">\n <div class=\"vm-field-report__stat-value\">14 mo<\/div>\n <div class=\"vm-field-report__stat-label\">Fan 1 & 3 still stable<\/div>\n <\/div>\n <div class=\"vm-field-report__stat\">\n <div class=\"vm-field-report__stat-value\">3.8\u21921.2<\/div>\n <div class=\"vm-field-report__stat-label\">Fan 2 mm\/s (after balance)<\/div>\n <\/div>\n <div class=\"vm-field-report__stat\">\n <div class=\"vm-field-report__stat-value\">\u20ac4,200<\/div>\n <div class=\"vm-field-report__stat-label\">saved\/year in service visits<\/div>\n <\/div>\n <\/div>\n<\/div>\n\n<p>The savings came from stopping unnecessary work. Two fans didn't need balancing at all. One needed alignment, not balancing. Only one actually had an unbalance problem. Monthly monitoring with a portable instrument cost 30 minutes per visit \u2014 the data told the team exactly which machine needed what, and when.<\/p>\n\n\n<h2 class=\"vm-section__title\" id=\"iso\">ISO 10816 Severity Reference<\/h2>\n\n<p>ISO 10816-3 provides vibration severity zones for industrial machines with power ratings between 15 kW and 300 kW. Use these as reference thresholds for your trending program. Your plant may set tighter limits based on experience.<\/p>\n\n<div class=\"vm-table-wrap\">\n<table class=\"vm-table\">\n <thead><tr><th>Zone<\/th><th>Vibration (mm\/s RMS)<\/th><th>Condition<\/th><th>Recommended action<\/th><\/tr><\/thead>\n <tbody>\n <tr><td class=\"vm-table__accent\">A<\/td><td>0 \u2013 2.8<\/td><td>New or recently overhauled<\/td><td>No action needed \u2014 continue monitoring at normal interval<\/td><\/tr>\n <tr><td class=\"vm-table__accent\">B<\/td><td>2.8 \u2013 7.1<\/td><td>Acceptable for long-term operation<\/td><td>Monitor \u2014 normal trending interval applies<\/td><\/tr>\n <tr><td class=\"vm-table__accent\">C<\/td><td>7.1 \u2013 11.2<\/td><td>Restricted, limited operation<\/td><td>Investigate and plan corrective action \u2014 shorten monitoring interval<\/td><\/tr>\n <tr><td class=\"vm-table__accent\">D<\/td><td>> 11.2<\/td><td>Damage imminent<\/td><td>Take immediate action \u2014 machine damage likely if continued<\/td><\/tr>\n <\/tbody>\n<\/table>\n<\/div>\n\n<p>These values apply to Group 2 machines (15\u2013300 kW) on rigid foundations. For Group 1 (>300 kW) and flexible foundations, thresholds differ \u2014 consult the full standard. The key point: Zone A\/B = monitor normally. Zone C = investigate and plan. Zone D = act now.<\/p>\n\n<div class=\"vm-data-grid\">\n <div class=\"vm-data-card\">\n <div class=\"vm-data-card__value\">2.8<\/div>\n <div class=\"vm-data-card__label\">mm\/s \u2014 Zone A\/B boundary<\/div>\n <\/div>\n <div class=\"vm-data-card\">\n <div class=\"vm-data-card__value\">7.1<\/div>\n <div class=\"vm-data-card__label\">mm\/s \u2014 Zone B\/C boundary<\/div>\n <\/div>\n <div class=\"vm-data-card\">\n <div class=\"vm-data-card__value\">11.2<\/div>\n <div class=\"vm-data-card__label\">mm\/s \u2014 Zone C\/D boundary<\/div>\n <\/div>\n <div class=\"vm-data-card\">\n <div class=\"vm-data-card__value\">\u00bd<\/div>\n <div class=\"vm-data-card__label\">\u00d7 lead time = monitoring interval<\/div>\n <\/div>\n<\/div>\n\n\n<h2 class=\"vm-section__title\" id=\"faq\">Frequently Asked Questions<\/h2>\n<div class=\"vm-faq\">\n <div class=\"vm-faq-item\"><button class=\"vm-faq-item__q\" aria-expanded=\"false\"><span>How often should I check vibration on rotating equipment?<\/span><svg class=\"vm-faq-item__icon\" width=\"22\" height=\"22\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><line x1=\"12\" y1=\"5\" x2=\"12\" y2=\"19\"\/><line x1=\"5\" y1=\"12\" x2=\"19\" y2=\"12\"\/><\/svg><\/button><div class=\"vm-faq-item__a\"><div class=\"vm-faq-item__a-inner\">It depends on criticality. Critical machines: continuous or weekly. Essential equipment: monthly. General-purpose: quarterly. The interval should be shorter than half the time from first detectable fault to failure. When trending shows a developing issue, increase frequency immediately.<\/div><\/div><\/div>\n <div class=\"vm-faq-item\"><button class=\"vm-faq-item__q\" aria-expanded=\"false\"><span>When should I rebalance a rotor?<\/span><svg class=\"vm-faq-item__icon\" width=\"22\" height=\"22\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><line x1=\"12\" y1=\"5\" x2=\"12\" y2=\"19\"\/><line x1=\"5\" y1=\"12\" x2=\"19\" y2=\"12\"\/><\/svg><\/button><div class=\"vm-faq-item__a\"><div class=\"vm-faq-item__a-inner\">When the 1\u00d7 RPM vibration exceeds your action threshold and diagnosis confirms unbalance. Also after any maintenance that changes mass distribution (impeller replacement, blade repair, motor rewind). Don't schedule balancing by calendar \u2014 let the data decide.<\/div><\/div><\/div>\n <div class=\"vm-faq-item\"><button class=\"vm-faq-item__q\" aria-expanded=\"false\"><span>What vibration level triggers action?<\/span><svg class=\"vm-faq-item__icon\" width=\"22\" height=\"22\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><line x1=\"12\" y1=\"5\" x2=\"12\" y2=\"19\"\/><line x1=\"5\" y1=\"12\" x2=\"19\" y2=\"12\"\/><\/svg><\/button><div class=\"vm-faq-item__a\"><div class=\"vm-faq-item__a-inner\">ISO 10816-3 for Group 2 machines (15\u2013300 kW, rigid): Zone A up to 2.8 mm\/s (good), Zone B 2.8\u20137.1 (acceptable), Zone C 7.1\u201311.2 (investigate), Zone D above 11.2 (act now). Many plants set tighter internal limits \u2014 particularly for precision equipment or sensitive installations.<\/div><\/div><\/div>\n <div class=\"vm-faq-item\"><button class=\"vm-faq-item__q\" aria-expanded=\"false\"><span>Why does vibration return soon after balancing?<\/span><svg class=\"vm-faq-item__icon\" width=\"22\" height=\"22\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><line x1=\"12\" y1=\"5\" x2=\"12\" y2=\"19\"\/><line x1=\"5\" y1=\"12\" x2=\"19\" y2=\"12\"\/><\/svg><\/button><div class=\"vm-faq-item__a\"><div class=\"vm-faq-item__a-inner\">Common causes: dirty rotor (deposits shift\/fall off), thermal distortion (rotor bows when hot), loose fits (rotor shifts on shaft), or running near resonance (small residual imbalance gets amplified). Investigate the root cause instead of rebalancing repeatedly.<\/div><\/div><\/div>\n <div class=\"vm-faq-item\"><button class=\"vm-faq-item__q\" aria-expanded=\"false\"><span>Can I use a portable instrument instead of permanent monitoring?<\/span><svg class=\"vm-faq-item__icon\" width=\"22\" height=\"22\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><line x1=\"12\" y1=\"5\" x2=\"12\" y2=\"19\"\/><line x1=\"5\" y1=\"12\" x2=\"19\" y2=\"12\"\/><\/svg><\/button><div class=\"vm-faq-item__a\"><div class=\"vm-faq-item__a-inner\">Yes \u2014 for most equipment. Portable route-based monitoring with the Balanset-1A covers vibration measurement, spectrum analysis, and on-site balancing. Permanent monitoring is only justified for critical assets where faults develop very fast or access is restricted.<\/div><\/div><\/div>\n <div class=\"vm-faq-item\"><button class=\"vm-faq-item__q\" aria-expanded=\"false\"><span>What's the difference between in-situ and workshop balancing?<\/span><svg class=\"vm-faq-item__icon\" width=\"22\" height=\"22\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><line x1=\"12\" y1=\"5\" x2=\"12\" y2=\"19\"\/><line x1=\"5\" y1=\"12\" x2=\"19\" y2=\"12\"\/><\/svg><\/button><div class=\"vm-faq-item__a\"><div class=\"vm-faq-item__a-inner\">Workshop balancing uses a balancing machine during manufacturing or overhaul. In-situ balancing uses a portable instrument (like the Balanset-1A) on the assembled machine. In-situ accounts for real bearing conditions, assembly tolerances, and actual support stiffness \u2014 factors the workshop machine can't replicate.<\/div><\/div><\/div>\n<\/div>\n\n\n<aside class=\"vm-author\" itemscope itemtype=\"https:\/\/schema.org\/Person\">\n <div class=\"vm-author__avatar\" aria-hidden=\"true\">NS<\/div>\n <div>\n <div class=\"vm-author__name\" itemprop=\"name\">Nikolai Shelkovenko<\/div>\n <div class=\"vm-author__role\"><span itemprop=\"jobTitle\">Vibration Analysis Engineer<\/span>, <span itemprop=\"worksFor\">Vibromera<\/span><\/div>\n <p class=\"vm-author__bio\" itemprop=\"description\">15+ years of field experience in vibration monitoring, trending, and on-site balancing across industrial, agricultural, and marine equipment. Developer of the Balanset-1A. Based in Porto, Portugal. Questions: <a href=\"https:\/\/wa.me\/37258364849\" target=\"_blank\" rel=\"noopener\">WhatsApp<\/a>.<\/p>\n <\/div>\n<\/aside>\n\n\n<div class=\"vm-cta\" style=\"margin-bottom:80px;\">\n <div>\n <h3 class=\"vm-cta__title\">One instrument. Monitor, diagnose, balance.<\/h3>\n <p class=\"vm-cta__text\">Balanset-1A: vibration meter + FFT spectrum + 2-plane balancing in a 4 kg case. Measure on the route, balance on the spot when needed. DHL worldwide. 2-year warranty. No subscriptions.<\/p>\n <\/div>\n <div class=\"vm-cta__actions\">\n <a href=\"https:\/\/vibromera.eu\/product\/balanset-1\/\" class=\"vm-btn vm-btn--primary\" target=\"_blank\" rel=\"noopener\">Order \u2014 \u20ac1,975<\/a>\n <a href=\"https:\/\/vibromera.eu\/guide-to-field-rotor-balancing-using-balanset-1a-instruments-theory-practice-and-problem-solving\/\" class=\"vm-btn vm-btn--outline\" target=\"_blank\" rel=\"noopener\">Read the full balancing guide<\/a>\n <\/div>\n<\/div>\n\n<\/div>\n<\/article>\n\n<script>\n(function(){\n 'use strict';\n document.querySelectorAll('.vm-faq-item__q').forEach(function(b){\n b.addEventListener('click',function(){\n var i=this.closest('.vm-faq-item'),o=i.classList.contains('is-open');\n document.querySelectorAll('.vm-faq-item').forEach(function(e){e.classList.remove('is-open');e.querySelector('.vm-faq-item__q').setAttribute('aria-expanded','false');});\n if(!o){i.classList.add('is-open');this.setAttribute('aria-expanded','true');}\n });\n });\n document.querySelectorAll('.vm-toc__list a').forEach(function(a){\n a.addEventListener('click',function(e){var t=document.querySelector(this.getAttribute('href'));if(t){e.preventDefault();window.scrollTo({top:t.getBoundingClientRect().top+window.pageYOffset-24,behavior:'smooth'});}});\n });\n})();\n<\/script>\n<\/body>\n<\/html><\/div><\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Vibration Monitoring Intervals and Balancing Schedules for Rotating Equipment | Vibromera Home\u203a Knowledge Base\u203a Monitoring Intervals Predictive Maintenance How Often to Check Vibration \u2014 and When That Check Should Become a Balance Job Check too rarely and you miss the window. Check too often and you waste hours on healthy […]<\/p>\n","protected":false},"author":2,"featured_media":3900,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ai_generated_summary":"","footnotes":""},"categories":[9,4,5,54],"tags":[],"class_list":["post-21166","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-rotors","category-example","category-solutions","category-content"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/posts\/21166","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/comments?post=21166"}],"version-history":[{"count":3,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/posts\/21166\/revisions"}],"predecessor-version":[{"id":21279,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/posts\/21166\/revisions\/21279"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/media\/3900"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/media?parent=21166"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/categories?post=21166"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/tags?post=21166"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}