{"id":100290,"date":"2026-02-15T20:32:05","date_gmt":"2026-02-15T20:32:05","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100290"},"modified":"2026-07-17T03:17:14","modified_gmt":"2026-07-17T03:17:14","slug":"vibration-iso20816-8-compressors","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/hi\/calculators\/vibration-iso20816-8-compressors\/","title":{"rendered":"Reciprocating Compressor System Vibration Evidence Worksheet"},"content":{"rendered":"\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Reciprocating Compressor System Vibration Evidence Worksheet\",\"description\":\"Organize applicability, system-boundary, measurement and source evidence for qualified review against ISO 20816-8:2018. 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print{.rc-actions,.rc-warning{display:none!important}.rc-result{display:block!important}.rc-card,.rc-section{box-shadow:none}}\n<\/style>\n<main id=\"vbm-rc-eval\">\n  <header class=\"rc-head\">\n    <h1>Reciprocating Compressor System Vibration Evidence Worksheet<\/h1>\n    <p>Organize applicability, system-boundary, measurement and source evidence for qualified review against ISO 20816-8:2018. This worksheet checks documentation completeness and the verified public scope only; it does not calculate a vibration class, condition diagnosis, alarm, trip setpoint, monitoring interval or operating instruction.<\/p>\n    <div class=\"rc-tags\"><span class=\"rc-tag\">ISO 20816-8:2018 &#8211; Edition 1<\/span><span class=\"rc-tag\">Current &#8211; confirmed 2024<\/span><span class=\"rc-tag\">Rigid foundations<\/span><span class=\"rc-tag\">Typical 120 to 1 800 r\/min<\/span><span class=\"rc-tag\">System fatigue classification<\/span><span class=\"rc-tag\">Not condition monitoring<\/span><span class=\"rc-tag\">No automatic class<\/span><\/div>\n  <\/header>\n  <div class=\"rc-warning\"><strong>Not a condition, protection or operating decision.<\/strong> Never derive a diagnosis, monitoring interval, alarm, trip setpoint, continued-operation decision, load restriction, maintenance schedule or shutdown instruction from this website. Apply the licensed current standard, exact system grouping and measurement procedure, fatigue\/interface evidence, manufacturer\/site limits, process risk, protection philosophy and accountable qualified review.<\/div>\n\n  <div class=\"rc-grid\">\n    <section class=\"rc-card\" aria-labelledby=\"rc-record-title\">\n      <h2 class=\"rc-card-head\" id=\"rc-record-title\">Evaluation-evidence record<\/h2>\n      <div class=\"rc-card-body\">\n        <form id=\"rc-form\" novalidate>\n          <div class=\"rc-form-grid\">\n            <div class=\"rc-field\"><label for=\"rc-system-id\">Compressor system identification<\/label><input id=\"rc-system-id\" type=\"text\" maxlength=\"260\" required><\/div>\n            <div class=\"rc-field\"><label for=\"rc-foundation\">Foundation<\/label><select id=\"rc-foundation\" required><option value=\"\">Select documented foundation<\/option><option value=\"rigid\">Rigid foundation<\/option><option value=\"flexible\">Flexible or spring-isolated foundation<\/option><option value=\"other\">Another foundation arrangement<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><\/div>\n            <div class=\"rc-field\"><label for=\"rc-arrangement\">Compressor arrangement<\/label><select id=\"rc-arrangement\" required><option value=\"\">Select documented arrangement<\/option><option value=\"horizontal\">Horizontal<\/option><option value=\"vertical\">Vertical<\/option><option value=\"v-type\">V-type<\/option><option value=\"w-type\">W-type<\/option><option value=\"l-type\">L-type<\/option><option value=\"other\">Another arrangement<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><span class=\"rc-hint\">The public abstract lists these as examples; a different arrangement requires licensed applicability review.<\/span><\/div>\n            <div class=\"rc-field\"><label for=\"rc-speed\">Rated-speed category<\/label><select id=\"rc-speed\" required><option value=\"\">Select documented category<\/option><option value=\"typical\">120 to 1 800 r\/min, inclusive<\/option><option value=\"outside\">Outside the typical 120 to 1 800 r\/min range<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><span class=\"rc-hint\">Outside the typical range is not declared categorically excluded, but different criteria might be appropriate.<\/span><\/div>\n            <div class=\"rc-field\"><label for=\"rc-speed-record\">Rated and measured operating speed<\/label><input id=\"rc-speed-record\" type=\"text\" maxlength=\"260\" required><\/div>\n            <div class=\"rc-field\"><label for=\"rc-speed-mode\">Speed mode<\/label><select id=\"rc-speed-mode\" required><option value=\"\">Select documented mode<\/option><option value=\"constant\">Constant speed<\/option><option value=\"variable\">Variable speed<\/option><option value=\"other\">Another mode<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><\/div>\n            <div class=\"rc-field\"><label for=\"rc-driver\">Driver type<\/label><select id=\"rc-driver\" required><option value=\"\">Select documented driver<\/option><option value=\"electric\">Electric motor<\/option><option value=\"gas-engine\">Gas engine<\/option><option value=\"diesel-engine\">Diesel engine<\/option><option value=\"steam-turbine\">Steam turbine<\/option><option value=\"other\">Another driver<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><\/div>\n            <div class=\"rc-field\"><label for=\"rc-driver-route\">Driver evaluated separately<\/label><select id=\"rc-driver-route\" required><option value=\"\">Select documented route<\/option><option value=\"separate\">Yes &#8211; applicable driver standard and duty classification recorded<\/option><option value=\"not-separated\">No &#8211; driver mixed into this assessment<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><span class=\"rc-hint\">ISO 20816-8 does not include the driver.<\/span><\/div>\n            <div class=\"rc-field\"><label for=\"rc-gearbox\">Gearbox configuration<\/label><select id=\"rc-gearbox\" required><option value=\"\">Select documented configuration<\/option><option value=\"with\">With gearbox<\/option><option value=\"without\">Without gearbox<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><\/div>\n            <div class=\"rc-field\"><label for=\"rc-coupling\">Coupling<\/label><select id=\"rc-coupling\" required><option value=\"\">Select documented coupling<\/option><option value=\"flexible\">Flexible coupling<\/option><option value=\"rigid\">Rigid coupling<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><\/div>\n            <div class=\"rc-field\"><label for=\"rc-lubrication\">Compressor operating type<\/label><select id=\"rc-lubrication\" required><option value=\"\">Select documented type<\/option><option value=\"dry\">Dry running<\/option><option value=\"lubricated\">Lubricated<\/option><option value=\"other\">Another type<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><\/div>\n            <div class=\"rc-field\"><label for=\"rc-hyper\">Hyper-compressor check<\/label><select id=\"rc-hyper\" required><option value=\"\">Select documented result<\/option><option value=\"no\">Not a hyper compressor<\/option><option value=\"yes\">Hyper compressor<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><\/div>\n            <div class=\"rc-field\"><label for=\"rc-purpose\">Evaluation purpose<\/label><select id=\"rc-purpose\" required><option value=\"\">Select documented purpose<\/option><option value=\"system-fatigue\">Classify compressor-system vibration and avoid fatigue problems<\/option><option value=\"condition-monitoring\">Condition monitoring or health diagnosis<\/option><option value=\"internal-diagnosis\">Internal valve, piston, ring or fault diagnosis<\/option><option value=\"noise\">Noise evaluation<\/option><option value=\"operating-decision\">Continue, restrict load, maintain or stop decision<\/option><option value=\"unknown\">Unknown or mixed purpose<\/option><\/select><\/div>\n            <div class=\"rc-field\"><label for=\"rc-target\">Assessment target<\/label><select id=\"rc-target\" required><option value=\"\">Select documented target<\/option><option value=\"compressor-system\">Compressor system: foundation, compressor, dampers, piping and mounted auxiliaries<\/option><option value=\"shaft\">Shaft vibration<\/option><option value=\"driver\">Driver vibration<\/option><option value=\"internal-components\">Internal machine components<\/option><option value=\"noise\">Noise<\/option><option value=\"other\">Another target<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><\/div>\n            <div class=\"rc-field rc-field-full\"><label for=\"rc-system-boundary\">Exact compressor-system boundary and mounted equipment<\/label><textarea id=\"rc-system-boundary\" maxlength=\"900\" required><\/textarea><span class=\"rc-hint\">Identify the foundation, compressor, pulsation dampers, directly mounted pipe system and auxiliary equipment included in the fatigue classification.<\/span><\/div>\n            <div class=\"rc-field\"><label for=\"rc-operating-basis\">Measurement basis<\/label><select id=\"rc-operating-basis\" required><option value=\"\">Select documented basis<\/option><option value=\"operational\">Operational measurement at documented duty<\/option><option value=\"startup-transient\">Startup, shutdown or transient<\/option><option value=\"unloaded-other\">Unloaded or another unqualified condition<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><\/div>\n            <div class=\"rc-field\"><label for=\"rc-quantity\">Measured vibration quantity<\/label><input id=\"rc-quantity\" type=\"text\" maxlength=\"280\" required><span class=\"rc-hint\">Do not infer velocity, displacement or acceleration from the former page.<\/span><\/div>\n            <div class=\"rc-field\"><label for=\"rc-amplitude\">Amplitude convention and statistic<\/label><input id=\"rc-amplitude\" type=\"text\" maxlength=\"260\" required><span class=\"rc-hint\">Record RMS, peak, peak-to-peak or the exact licensed convention.<\/span><\/div>\n            <div class=\"rc-field\"><label for=\"rc-unit\">Reported unit<\/label><input id=\"rc-unit\" type=\"text\" maxlength=\"120\" required><\/div>\n            <div class=\"rc-field\"><label for=\"rc-value\">Reported value as recorded<\/label><input id=\"rc-value\" type=\"text\" maxlength=\"300\" required><span class=\"rc-hint\">Decimal point or decimal comma is preserved. No numerical class is calculated.<\/span><\/div>\n            <div class=\"rc-field rc-field-full\"><label for=\"rc-band\">Frequency band, filtering and signal processing<\/label><input id=\"rc-band\" type=\"text\" maxlength=\"340\" required><span class=\"rc-hint\">Do not assume the former 2 to 1 000 Hz rule without the licensed current procedure.<\/span><\/div>\n            <div class=\"rc-field rc-field-full\"><label for=\"rc-positions\">Measurement positions, directions and grouping<\/label><textarea id=\"rc-positions\" maxlength=\"900\" required><\/textarea><\/div>\n            <div class=\"rc-field rc-field-full\"><label for=\"rc-chain\">Transducer, mounting, calibration and complete measurement chain<\/label><textarea id=\"rc-chain\" maxlength=\"900\" required><\/textarea><\/div>\n            <div class=\"rc-field rc-field-full\"><label for=\"rc-operating-conditions\">Operating duty: speed, load, pressure, gas state and thermal condition<\/label><textarea id=\"rc-operating-conditions\" maxlength=\"900\" required><\/textarea><\/div>\n            <div class=\"rc-field rc-field-full\"><label for=\"rc-fatigue-interfaces\">Fatigue\/interface evidence for foundation, dampers, piping and mounted auxiliaries<\/label><textarea id=\"rc-fatigue-interfaces\" maxlength=\"900\" required><\/textarea><\/div>\n            <div class=\"rc-field rc-field-full\"><label for=\"rc-source-ref\">Licensed criterion and exact source reference<\/label><textarea id=\"rc-source-ref\" maxlength=\"850\" required><\/textarea><span class=\"rc-hint\">Record edition, clause\/table, system group, criterion, boundary convention and applicable notes. Do not copy protected text into this public worksheet.<\/span><\/div>\n            <div class=\"rc-field rc-field-full\"><label for=\"rc-site-limits\">Manufacturer, site, process-risk and protection-system limits<\/label><textarea id=\"rc-site-limits\" maxlength=\"850\" required><\/textarea><\/div>\n            <div class=\"rc-field\"><label for=\"rc-report\">Measurement report ID and date<\/label><input id=\"rc-report\" type=\"text\" maxlength=\"240\" required><\/div>\n            <div class=\"rc-field\"><label for=\"rc-reviewer\">Qualified reviewer and review date<\/label><input id=\"rc-reviewer\" type=\"text\" maxlength=\"240\" required><\/div>\n            <div class=\"rc-field rc-field-full\"><label for=\"rc-gaps\">Known gaps or unresolved questions<\/label><textarea id=\"rc-gaps\" maxlength=\"700\"><\/textarea><\/div>\n          <\/div>\n\n          <fieldset class=\"rc-evidence\">\n            <legend>Evidence categories present<\/legend>\n            <div class=\"rc-checks\">\n              <label class=\"rc-check\"><input id=\"rc-ev-edition\" type=\"checkbox\"><span>The current edition and predecessor lifecycle are verified.<small>ISO 20816-8:2018 Edition 1 is current and confirmed in 2024; ISO 10816-8:2014 is withdrawn.<\/small><\/span><\/label>\n              <label class=\"rc-check\"><input id=\"rc-ev-foundation-speed\" type=\"checkbox\"><span>Rigid foundation, rated speed and operating speed are evidenced.<small>120 to 1 800 r\/min is typical; an outside-range case requires different-criteria review.<\/small><\/span><\/label>\n              <label class=\"rc-check\"><input id=\"rc-ev-arrangement\" type=\"checkbox\"><span>Compressor arrangement and constant\/variable-speed mode are documented.<small>Public examples include horizontal, vertical, V-, W- and L-type systems.<\/small><\/span><\/label>\n              <label class=\"rc-check\"><input id=\"rc-ev-drive\" type=\"checkbox\"><span>Driver, gearbox and coupling are documented, and the driver is evaluated separately.<small>ISO 20816-8 excludes the driver from this compressor-system evaluation.<\/small><\/span><\/label>\n              <label class=\"rc-check\"><input id=\"rc-ev-operation\" type=\"checkbox\"><span>Dry-running\/lubricated status and the hyper-compressor exclusion are evidenced.<small>Hyper compressors are explicitly outside the public scope.<\/small><\/span><\/label>\n              <label class=\"rc-check\"><input id=\"rc-ev-system\" type=\"checkbox\"><span>The complete system and fatigue interfaces are documented.<small>Foundation, compressor, dampers, piping and mounted auxiliaries are not reduced to one generic frame value.<\/small><\/span><\/label>\n              <label class=\"rc-check\"><input id=\"rc-ev-purpose\" type=\"checkbox\"><span>The purpose is system classification and fatigue avoidance, not condition monitoring.<small>No class is converted into a health diagnosis or monitoring interval.<\/small><\/span><\/label>\n              <label class=\"rc-check\"><input id=\"rc-ev-exclusions\" type=\"checkbox\"><span>Shaft, driver, internal diagnostic and noise exclusions are screened.<small>Internal valve\/piston\/ring problems can require specialist diagnostics outside this procedure.<\/small><\/span><\/label>\n              <label class=\"rc-check\"><input id=\"rc-ev-measurement\" type=\"checkbox\"><span>Operational duty, quantity, statistic, unit, band, positions, grouping and measurement chain are documented.<small>A bare mm\/s number cannot establish a current classification.<\/small><\/span><\/label>\n              <label class=\"rc-check\"><input id=\"rc-ev-licensed\" type=\"checkbox\"><span>Every numerical criterion comes from the licensed current standard.<small>Exact group, clause\/table, conditions, notes and boundary convention are controlled outside this website.<\/small><\/span><\/label>\n              <label class=\"rc-check\"><input id=\"rc-ev-site\" type=\"checkbox\"><span>Manufacturer, site, process-risk and protection-system limits are separately controlled.<small>No web class is substituted for an operating or protection decision.<\/small><\/span><\/label>\n              <label class=\"rc-check\"><input id=\"rc-ev-review\" type=\"checkbox\"><span>The report, dataset and accountable qualified review are traceable.<small>This website never supplies a class, diagnosis, monitoring interval or operating instruction.<\/small><\/span><\/label>\n            <\/div>\n          <\/fieldset>\n          <div class=\"rc-actions\"><button class=\"rc-btn\" type=\"submit\">Check evidence completeness<\/button><button class=\"rc-btn rc-btn-secondary\" id=\"rc-clear\" type=\"button\">Clear worksheet<\/button><\/div>\n          <div class=\"rc-result\" id=\"rc-result\" role=\"status\" aria-live=\"polite\">\n            <h3 id=\"rc-result-title\">Not assessed<\/h3><p id=\"rc-result-summary\"><\/p><ul id=\"rc-result-list\"><\/ul>\n            <p class=\"rc-result-note\">This output is not an ISO vibration class, condition diagnosis, alarm, trip setpoint, monitoring interval, acceptance decision or instruction to continue, maintain, restrict load or stop a machine.<\/p>\n          <\/div>\n        <\/form>\n      <\/div>\n    <\/section>\n\n    <aside class=\"rc-card\" aria-labelledby=\"rc-boundary-title\">\n      <h2 class=\"rc-card-head\" id=\"rc-boundary-title\">Verified public applicability boundary<\/h2>\n      <div class=\"rc-card-body\">\n        <span class=\"rc-status\">VERIFIED_OFFICIAL_STANDARD_RECORD<\/span>\n        <ul class=\"rc-side-list\">\n          <li>ISO 20816-8:2018 Edition 1 is current and was confirmed in 2024 at stage 90.93.<\/li>\n          <li>It establishes procedures and guidelines for measurement and classification of reciprocating compressor-system mechanical vibration.<\/li>\n          <li>The values primarily classify system vibration and help avoid fatigue problems in the foundation, compressor, dampers, piping and mounted auxiliary equipment.<\/li>\n          <li>It applies to reciprocating compressors on rigid foundations with typical rated speeds from 120 r\/min through 1 800 r\/min.<\/li>\n          <li>General guidelines can be used outside that typical speed range, but different evaluation criteria might be appropriate.<\/li>\n          <li>Examples include horizontal, vertical, V-, W- and L-type; constant\/variable speed; listed driver and coupling configurations; dry-running and lubricated systems.<\/li>\n          <li>Drivers are excluded and require evaluation under the appropriate other standard and intended-duty classification.<\/li>\n          <li>Shaft vibration is not considered. Hyper compressors are excluded. Noise is outside scope.<\/li>\n          <li>Internal valve, piston and ring problems might not be detected; specialist diagnostics can be required outside this procedure.<\/li>\n          <li>The guidelines are explicitly not intended for condition monitoring purposes.<\/li>\n        <\/ul>\n        <div class=\"rc-needs\"><strong>NEEDS_LICENSED_SOURCE<\/strong><br>Exact numerical classification criteria, system groups, quantity and amplitude conventions, positions\/directions, frequency band, operational conditions, boundary inclusivity, grouping\/combination method and fatigue-screening procedure are protected. No numerical class boundary is reproduced or inferred here.<\/div>\n      <\/div>\n    <\/aside>\n  <\/div>\n\n  <section class=\"rc-section\" aria-labelledby=\"rc-facts-title\">\n    <h2 id=\"rc-facts-title\">What was corrected<\/h2>\n    <div class=\"rc-section-body rc-facts\">\n      <div class=\"rc-fact\"><strong>Unlicensed rigid-foundation boundaries removed.<\/strong> The former A\/B, B\/C and C\/D values lacked a checked licensed current clause\/table, group, measurement definition and boundary convention.<\/div>\n      <div class=\"rc-fact\"><strong>Fabricated flexible-foundation boundaries removed.<\/strong> Multiplying claimed rigid values by a fixed uplift cannot create an ISO classification outside the public rigid-foundation scope.<\/div>\n      <div class=\"rc-fact\"><strong>Condition-monitoring use removed.<\/strong> The official abstract explicitly says these guidelines are not intended for condition monitoring.<\/div>\n      <div class=\"rc-fact\"><strong>Piping scope corrected.<\/strong> Piping and directly mounted pipe systems are part of the stated fatigue\/system purpose; they are not blanket-excluded from the standard.<\/div>\n      <div class=\"rc-fact\"><strong>System boundary restored.<\/strong> Foundation, compressor, dampers, piping and mounted auxiliaries must be recorded instead of treating one frame scalar as the whole system.<\/div>\n      <div class=\"rc-fact\"><strong>Driver routing made explicit.<\/strong> Driver vibration is evaluated separately under the applicable standard for its intended duty.<\/div>\n      <div class=\"rc-fact\"><strong>Internal diagnosis separated.<\/strong> Valve, piston and ring problems can evade the general criteria and require investigative diagnostics outside scope.<\/div>\n      <div class=\"rc-fact\"><strong>Unverified measurement prescriptions removed.<\/strong> The former 2 to 1 000 Hz band, three-axis\/highest-value rule, locations and repetition count are not presented without the licensed procedure.<\/div>\n      <div class=\"rc-fact\"><strong>Automatic operating actions removed.<\/strong> A web value no longer authorizes continued operation, monitoring intervals, maintenance, load restriction or shutdown.<\/div>\n      <div class=\"rc-fact\"><strong>Tool description now matches reality.<\/strong> The old post advertised inputs, presets and instant results although authoritative post_content contained no controls or calculation script.<\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"rc-section\" aria-labelledby=\"rc-sources-title\">\n    <h2 id=\"rc-sources-title\">Standard and source register<\/h2>\n    <div class=\"rc-section-body rc-source-wrap\">\n      <table class=\"rc-table\">\n        <thead><tr><th>ID<\/th><th>Source and lifecycle<\/th><th>Verified public support<\/th><th>Not supported publicly<\/th><\/tr><\/thead>\n        <tbody>\n          <tr id=\"source-S1\"><td>S1<\/td><td><a href=\"https:\/\/www.iso.org\/standard\/75440.html\" rel=\"noopener\" target=\"_blank\">ISO 20816-8:2018<\/a><br>Edition 1 &#8211; published August 2018 &#8211; confirmed 2024 &#8211; stage 90.93<\/td><td>System\/fatigue purpose; rigid foundation; typical speed; operational basis; covered examples; driver, shaft, hyper-compressor, internal-diagnostic, condition-monitoring and noise boundaries.<\/td><td>Numerical criteria, exact groups, quantity\/statistic, locations\/directions, bands, boundary rules, combination method, alarms, trips, intervals and operating actions.<\/td><\/tr>\n          <tr id=\"source-S2\"><td>S2<\/td><td><a href=\"https:\/\/www.iso.org\/standard\/56782.html\" rel=\"noopener\" target=\"_blank\">ISO 10816-8:2014<\/a><br>Edition 1 &#8211; withdrawn 10 August 2018 &#8211; revised by ISO 20816-8:2018<\/td><td>The direct predecessor lifecycle and its broadly similar former public scope.<\/td><td>No proof that any former numerical table, measurement detail, semantics or actions are unchanged in the current document.<\/td><\/tr>\n          <tr id=\"source-S3\"><td>S3<\/td><td><a href=\"https:\/\/www.iso.org\/standard\/78311.html\" rel=\"noopener\" target=\"_blank\">ISO 20816-3:2022<\/a><br>Edition 2 &#8211; published and current<\/td><td>Part 3 explicitly excludes reciprocating compressor systems and routes them to ISO 20816-8.<\/td><td>Part 3 machine groups and numerical criteria cannot be transplanted to a Part 8 system or used as a normative web comparison.<\/td><\/tr>\n        <\/tbody>\n      <\/table>\n    <\/div>\n  <\/section>\n\n  <section class=\"rc-section rc-notes\" aria-labelledby=\"rc-notes-title\">\n    <h2 id=\"rc-notes-title\">Review notes<\/h2>\n    <div class=\"rc-section-body\">\n      <details><summary>Why does this page no longer output vibration Class A, B, C or D?<\/summary><p>The former values lacked a checked licensed ISO 20816-8:2018 clause\/table, exact system group, complete measurement definition and verified boundary convention. A numerical class would therefore be unsupported.<\/p><\/details>\n      <details><summary>Does ISO 20816-8 exclude piping vibration?<\/summary><p>No blanket exclusion is supported. The official abstract says the values help avoid fatigue problems in piping and mounted equipment and protect directly mounted pipe systems. A separate pulsation\/mechanical study can still be required for broader piping risks.<\/p><\/details>\n      <details><summary>Can the classification be used for condition monitoring or internal fault diagnosis?<\/summary><p>The official abstract explicitly says the guidelines are not intended for condition monitoring and warns that internal valve, piston and ring problems may require investigative diagnostics outside scope.<\/p><\/details>\n      <details><summary>Are compressors outside 120 to 1 800 r\/min automatically excluded?<\/summary><p>No. That interval is described as typical. The general guidelines can be used outside it, but the official abstract warns that different evaluation criteria might be appropriate.<\/p><\/details>\n      <details><summary>Can this worksheet recommend continued operation, monitoring frequency, maintenance, load restriction or shutdown?<\/summary><p>No. It only checks whether a documentation package is complete enough for licensed external evaluation by an accountable qualified reviewer.<\/p><\/details>\n    <\/div>\n  <\/section>\n  <p class=\"rc-foot\">Source access: 17 July 2026. No closed ISO clause, table, coefficient or class boundary is copied or inferred. The former numerical classifications, flexible-foundation extrapolation and operating advice were removed because their current normative basis and complete application conditions were not verified.<\/p>\n<\/main>\n<script>\n(function(){\n'use strict';\nvar form=document.getElementById('rc-form'),result=document.getElementById('rc-result'),title=document.getElementById('rc-result-title'),summary=document.getElementById('rc-result-summary'),list=document.getElementById('rc-result-list');\nvar requiredFields=['rc-system-id','rc-foundation','rc-arrangement','rc-speed','rc-speed-record','rc-speed-mode','rc-driver','rc-driver-route','rc-gearbox','rc-coupling','rc-lubrication','rc-hyper','rc-purpose','rc-target','rc-system-boundary','rc-operating-basis','rc-quantity','rc-amplitude','rc-unit','rc-value','rc-band','rc-positions','rc-chain','rc-operating-conditions','rc-fatigue-interfaces','rc-source-ref','rc-site-limits','rc-report','rc-reviewer'];\nvar evidenceIds=['rc-ev-edition','rc-ev-foundation-speed','rc-ev-arrangement','rc-ev-drive','rc-ev-operation','rc-ev-system','rc-ev-purpose','rc-ev-exclusions','rc-ev-measurement','rc-ev-licensed','rc-ev-site','rc-ev-review'];\nfunction labelFor(id){var label=document.querySelector('label[for=\"'+id+'\"]');return label?label.firstChild.textContent.trim():id}\nfunction addItem(text){var item=document.createElement('li');item.textContent=text;list.appendChild(item)}\nfunction clearList(){while(list.firstChild)list.removeChild(list.firstChild)}\nfunction stale(){result.className='rc-result';title.textContent='Not assessed';summary.textContent='';clearList()}\nfunction scopeConflicts(){\n  var conflicts=[],foundation=document.getElementById('rc-foundation').value,arrangement=document.getElementById('rc-arrangement').value,speed=document.getElementById('rc-speed').value,speedMode=document.getElementById('rc-speed-mode').value,driver=document.getElementById('rc-driver').value,driverRoute=document.getElementById('rc-driver-route').value,gearbox=document.getElementById('rc-gearbox').value,coupling=document.getElementById('rc-coupling').value,lubrication=document.getElementById('rc-lubrication').value,hyper=document.getElementById('rc-hyper').value,purpose=document.getElementById('rc-purpose').value,target=document.getElementById('rc-target').value,basis=document.getElementById('rc-operating-basis').value;\n  if(foundation!=='rigid')conflicts.push('The verified public ISO 20816-8:2018 scope is for reciprocating compressors mounted on rigid foundations; no flexible-foundation class is created here.');\n  if(['horizontal','vertical','v-type','w-type','l-type'].indexOf(arrangement)===-1)conflicts.push('The selected arrangement is not established by the examples in the official public abstract; verify it in the licensed current standard.');\n  if(speed!=='typical')conflicts.push('The public typical-speed basis does not establish this case; outside 120 to 1 800 r\/min different criteria might be appropriate and require licensed review.');\n  if(['constant','variable'].indexOf(speedMode)===-1)conflicts.push('Document constant- or variable-speed operation and its licensed grouping.');\n  if(['electric','gas-engine','diesel-engine','steam-turbine'].indexOf(driver)===-1)conflicts.push('The selected driver is not established by the examples in the official public abstract.');\n  if(driverRoute!=='separate')conflicts.push('The driver is excluded from ISO 20816-8 and must be evaluated separately for its intended duty.');\n  if(['with','without'].indexOf(gearbox)===-1)conflicts.push('Document whether the compressor system includes a gearbox.');\n  if(['flexible','rigid'].indexOf(coupling)===-1)conflicts.push('Document a flexible or rigid coupling configuration.');\n  if(['dry','lubricated'].indexOf(lubrication)===-1)conflicts.push('Document dry-running or lubricated compressor operation.');\n  if(hyper!=='no')conflicts.push('Hyper compressors are explicitly excluded, and an unknown hyper-compressor status cannot pass public-scope screening.');\n  if(purpose!=='system-fatigue')conflicts.push('ISO 20816-8 public purpose is compressor-system vibration classification and fatigue avoidance, not condition monitoring, diagnosis, noise or an automatic operating decision.');\n  if(target!=='compressor-system')conflicts.push('Shaft, driver, internal diagnostic, noise and undocumented targets are excluded or outside the verified public compressor-system boundary.');\n  if(basis!=='operational')conflicts.push('The public general criteria relate to operational measurements at documented duty; other or unknown states require licensed review.');\n  return conflicts;\n}\nform.addEventListener('submit',function(event){event.preventDefault();clearList();var missing=[];requiredFields.forEach(function(id){var el=document.getElementById(id),value=String(el.value).trim();if(!value||!el.validity.valid)missing.push(labelFor(id))});var unchecked=[];evidenceIds.forEach(function(id){var el=document.getElementById(id);if(!el.checked)unchecked.push(el.closest('label').querySelector('span').firstChild.textContent.trim())});var conflicts=scopeConflicts();if(missing.length||unchecked.length){result.className='rc-result rc-visible rc-incomplete';title.textContent='Documentation incomplete';summary.textContent='Complete the missing record fields and evidence categories before external review.';missing.forEach(function(text){addItem('Missing record: '+text)});unchecked.forEach(function(text){addItem('Evidence not confirmed: '+text)})}else if(conflicts.length){result.className='rc-result rc-visible rc-conflict';title.textContent='Scope, exclusion or configuration conflict';summary.textContent='Resolve the documented applicability conflict before applying any licensed evaluation procedure.';conflicts.forEach(function(text){addItem(text)})}else{result.className='rc-result rc-visible rc-ready';title.textContent='Evidence package ready for licensed external evaluation';summary.textContent='All worksheet records and evidence categories are marked present, and the public screening predicates pass. 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