{"id":100288,"date":"2026-02-15T20:32:00","date_gmt":"2026-02-15T20:32:00","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100288"},"modified":"2026-07-17T02:10:46","modified_gmt":"2026-07-17T02:10:46","slug":"vibration-iso20816-4-gas-turbines","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/sr\/calculators\/vibration-iso20816-4-gas-turbines\/","title":{"rendered":"Gas Turbine Vibration Evaluation Evidence Worksheet"},"content":{"rendered":"\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Gas Turbine Vibration Evaluation Evidence Worksheet\",\"description\":\"Organize applicability, measurement and source evidence for qualified review against ISO 20816-4:2018. 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summary{cursor:pointer;font-weight:750}.ge-notes p{margin:9px 0 0;color:var(--muted)}.ge-foot{margin-top:20px;padding:15px;border:1px solid var(--line);border-radius:12px;color:var(--muted);font-size:14px}\n@media(max-width:820px){.ge-grid{grid-template-columns:1fr}.ge-form-grid,.ge-facts{grid-template-columns:1fr}.ge-field-full{grid-column:auto}.ge-head{padding:25px}.ge-card-body,.ge-section-body{padding:17px}}\n@media print{.ge-actions,.ge-warning{display:none!important}.ge-result{display:block!important}.ge-card,.ge-section{box-shadow:none}}\n<\/style>\n<main id=\"vbm-gt-eval\">\n  <header class=\"ge-head\">\n    <h1>Gas Turbine Vibration Evaluation Evidence Worksheet<\/h1>\n    <p>Organize applicability, measurement and source evidence for qualified review against ISO 20816-4:2018. This worksheet checks documentation completeness and public scope only; it does not calculate a vibration zone, diagnosis, alarm, trip setpoint, acceptance result or operating instruction.<\/p>\n    <div class=\"ge-tags\"><span class=\"ge-tag\">ISO 20816-4:2018 &#8211; Edition 1<\/span><span class=\"ge-tag\">Published &#8211; stage 90.93<\/span><span class=\"ge-tag\">Land-based<\/span><span class=\"ge-tag\">Above 3 MW<\/span><span class=\"ge-tag\">3 000 to 30 000 r\/min<\/span><span class=\"ge-tag\">Fluid-film bearings<\/span><span class=\"ge-tag\">No automatic zone<\/span><\/div>\n  <\/header>\n  <div class=\"ge-warning\"><strong>Not a protection or machine-safety decision.<\/strong> Never derive an alarm, trip setpoint, continued-operation decision, load reduction or shutdown instruction from this website. Apply the licensed current standard, exact machine and measurement configuration, manufacturer\/site limits, protection philosophy, trends and accountable qualified review.<\/div>\n\n  <div class=\"ge-grid\">\n    <section class=\"ge-card\" aria-labelledby=\"ge-record-title\">\n      <h2 class=\"ge-card-head\" id=\"ge-record-title\">Evaluation-evidence record<\/h2>\n      <div class=\"ge-card-body\">\n        <form id=\"ge-form\" novalidate>\n          <div class=\"ge-form-grid\">\n            <div class=\"ge-field\"><label for=\"ge-site\">Installation<\/label><select id=\"ge-site\" required><option value=\"\">Select documented installation<\/option><option value=\"land\">Land-based gas turbine<\/option><option value=\"marine-air-other\">Marine, aircraft or other non-land installation<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><\/div>\n            <div class=\"ge-field\"><label for=\"ge-family\">Turbine family\/dynamic character<\/label><select id=\"ge-family\" required><option value=\"\">Select documented family<\/option><option value=\"heavy\">Heavy-duty, not aero-derivative<\/option><option value=\"aero\">Aero-derivative<\/option><option value=\"aero-similar\">Dynamic properties similar to an aero-derivative<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><\/div>\n            <div class=\"ge-field\"><label for=\"ge-power\">Gas-turbine power output<\/label><select id=\"ge-power\" required><option value=\"\">Select documented category<\/option><option value=\"gt3-le40\">Above 3 MW and at or below 40 MW<\/option><option value=\"gt40\">Above 40 MW<\/option><option value=\"le3\">3 MW or below<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><\/div>\n            <div class=\"ge-field\"><label for=\"ge-speed\">Operating speed under load<\/label><select id=\"ge-speed\" required><option value=\"\">Select documented category<\/option><option value=\"within\">3 000 to 30 000 r\/min<\/option><option value=\"outside\">Below 3 000 or above 30 000 r\/min<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><\/div>\n            <div class=\"ge-field\"><label for=\"ge-special-speed\">Above-40-MW rated-speed route<\/label><select id=\"ge-special-speed\" required><option value=\"\">Select documented case<\/option><option value=\"not-applicable\">Power is not above 40 MW<\/option><option value=\"exact-four\">1 500, 1 800, 3 000 or 3 600 r\/min<\/option><option value=\"other\">Another rated speed<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><span class=\"ge-hint\">Above 40 MW at one of the four listed rated speeds is directed to ISO 20816-2.<\/span><\/div>\n            <div class=\"ge-field\"><label for=\"ge-bearing\">Main bearing type<\/label><select id=\"ge-bearing\" required><option value=\"\">Select documented bearing type<\/option><option value=\"fluid-film\">Fluid-film bearings<\/option><option value=\"rolling\">Rolling-element bearings<\/option><option value=\"mixed-other\">Mixed or other bearing arrangement<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><\/div>\n            <div class=\"ge-field\"><label for=\"ge-train\">Machine-train configuration<\/label><select id=\"ge-train\" required><option value=\"\">Select documented configuration<\/option><option value=\"gas-only\">Gas-turbine set without an excluded driven machine<\/option><option value=\"coupled-other\">Directly coupled other rotating machinery, not an excluded type<\/option><option value=\"gearbox\">Coupled through a gearbox<\/option><option value=\"generator\">Turbine-driven generator<\/option><option value=\"pump\">Turbine-driven pump<\/option><option value=\"rotary-compressor\">Turbine-driven rotary compressor<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><\/div>\n            <div class=\"ge-field\"><label for=\"ge-target\">Evaluated vibration\/measurement target<\/label><select id=\"ge-target\" required><option value=\"\">Select documented target<\/option><option value=\"housing-radial\">Main bearing housing or pedestal, radial\/transverse structural vibration<\/option><option value=\"thrust-axial\">Thrust-bearing housing, axial structural vibration<\/option><option value=\"shaft-radial\">Rotating shaft at\/near a main bearing, radial\/transverse vibration<\/option><option value=\"gearbox-main-io\">Gearbox main input\/output bearing vibration<\/option><option value=\"gearbox-internal\">Internal gearbox bearing vibration<\/option><option value=\"gear-condition\">Gear-condition assessment<\/option><option value=\"combustion\">Combustion vibration evaluation<\/option><option value=\"rolling-bearing\">Rolling-element-bearing vibration evaluation<\/option><option value=\"other\">Other or not established<\/option><\/select><\/div>\n            <div class=\"ge-field\"><label for=\"ge-basis\">Evaluation basis<\/label><select id=\"ge-basis\" required><option value=\"\">Select documented basis<\/option><option value=\"steady\">Normal steady-state vibration<\/option><option value=\"transient\">Run-up, run-down, initial loading or load-change transient<\/option><option value=\"change\">Change in normal steady-state vibration<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><\/div>\n            <div class=\"ge-field\"><label for=\"ge-purpose\">Evaluation purpose<\/label><select id=\"ge-purpose\" required><option value=\"\">Select documented purpose<\/option><option value=\"broadband-severity\">In-situ broad-band vibration severity evaluation<\/option><option value=\"gearbox-evaluation\">General gearbox vibration evaluation<\/option><option value=\"gear-diagnosis\">Internal gearbox or gear-condition diagnosis<\/option><option value=\"combustion-evaluation\">Combustion-vibration evaluation<\/option><option value=\"rolling-evaluation\">Rolling-element-bearing vibration evaluation<\/option><\/select><\/div>\n            <div class=\"ge-field ge-field-full\"><label for=\"ge-machine-id\">Machine set, train and coupled-component identification<\/label><input id=\"ge-machine-id\" type=\"text\" maxlength=\"300\" required><span class=\"ge-hint\">Record model, serial\/asset ID, rated power and speed, shaftline, gearbox and each coupled component.<\/span><\/div>\n            <div class=\"ge-field\"><label for=\"ge-position\">Measurement position<\/label><input id=\"ge-position\" type=\"text\" maxlength=\"180\" required><\/div>\n            <div class=\"ge-field\"><label for=\"ge-direction\">Measurement direction<\/label><input id=\"ge-direction\" type=\"text\" maxlength=\"140\" required><\/div>\n            <div class=\"ge-field\"><label for=\"ge-quantity\">Quantity and amplitude convention<\/label><input id=\"ge-quantity\" type=\"text\" maxlength=\"180\" required placeholder=\"e.g. velocity RMS or displacement p-p\"><\/div>\n            <div class=\"ge-field\"><label for=\"ge-unit\">Reported unit<\/label><input id=\"ge-unit\" type=\"text\" maxlength=\"100\" required><\/div>\n            <div class=\"ge-field ge-field-full\"><label for=\"ge-value\">Reported value(s) or dataset reference<\/label><input id=\"ge-value\" type=\"text\" maxlength=\"300\" required><span class=\"ge-hint\">The original text is preserved, including decimal point or decimal comma. No numerical zone is calculated.<\/span><\/div>\n            <div class=\"ge-field ge-field-full\"><label for=\"ge-band\">Frequency band, filtering and signal processing<\/label><input id=\"ge-band\" type=\"text\" maxlength=\"300\" required><span class=\"ge-hint\">Do not assume a universal frequency range from the former page.<\/span><\/div>\n            <div class=\"ge-field ge-field-full\"><label for=\"ge-operation\">Operating conditions during measurement<\/label><textarea id=\"ge-operation\" maxlength=\"700\" required><\/textarea><span class=\"ge-hint\">Record actual speed, load, thermal\/process state and whether the evidence is steady, transient or a change.<\/span><\/div>\n            <div class=\"ge-field ge-field-full\"><label for=\"ge-change\">Baseline, change\/trend and time basis<\/label><textarea id=\"ge-change\" maxlength=\"700\" required><\/textarea><\/div>\n            <div class=\"ge-field ge-field-full\"><label for=\"ge-chain\">Transducer, mounting, probe geometry and complete measurement chain<\/label><textarea id=\"ge-chain\" maxlength=\"800\" required><\/textarea><\/div>\n            <div class=\"ge-field ge-field-full\"><label for=\"ge-source-ref\">Licensed criterion and exact source reference<\/label><textarea id=\"ge-source-ref\" maxlength=\"700\" required><\/textarea><span class=\"ge-hint\">Record the licensed edition, amendment, clause\/table, configuration, criterion, boundary convention and all applicable notes. Do not copy protected text into this public worksheet.<\/span><\/div>\n            <div class=\"ge-field\"><label for=\"ge-report\">Measurement report ID and date<\/label><input id=\"ge-report\" type=\"text\" maxlength=\"220\" required><\/div>\n            <div class=\"ge-field\"><label for=\"ge-reviewer\">Qualified reviewer and review date<\/label><input id=\"ge-reviewer\" type=\"text\" maxlength=\"220\" required><\/div>\n            <div class=\"ge-field ge-field-full\"><label for=\"ge-gaps\">Known gaps or unresolved questions<\/label><textarea id=\"ge-gaps\" maxlength=\"700\"><\/textarea><\/div>\n          <\/div>\n\n          <fieldset class=\"ge-evidence\">\n            <legend>Evidence categories present<\/legend>\n            <div class=\"ge-checks\">\n              <label class=\"ge-check\"><input id=\"ge-ev-edition\" type=\"checkbox\"><span>The current edition and lifecycle are verified.<small>ISO 20816-4:2018 Edition 1 is published and confirmed at stage 90.93; no replacement is listed on the official record accessed here.<\/small><\/span><\/label>\n              <label class=\"ge-check\"><input id=\"ge-ev-installation\" type=\"checkbox\"><span>Land-based installation is evidenced.<small>The public scope is not a generic rule for every marine, aircraft or other gas turbine.<\/small><\/span><\/label>\n              <label class=\"ge-check\"><input id=\"ge-ev-power-speed\" type=\"checkbox\"><span>Power output and operating speed under load are evidenced.<small>Public scope requires above 3 MW and 3 000 to 30 000 r\/min; the special above-40-MW route is screened.<\/small><\/span><\/label>\n              <label class=\"ge-check\"><input id=\"ge-ev-family-bearing\" type=\"checkbox\"><span>Turbine dynamics and fluid-film bearing configuration are evidenced.<small>Aero-derivatives, dynamically similar machines and rolling-element-bearing vibration are excluded.<\/small><\/span><\/label>\n              <label class=\"ge-check\"><input id=\"ge-ev-train\" type=\"checkbox\"><span>The complete train and excluded driven components are screened.<small>Generators, pumps, rotary compressors and gearbox limitations require explicit routing.<\/small><\/span><\/label>\n              <label class=\"ge-check\"><input id=\"ge-ev-position\" type=\"checkbox\"><span>Measurement target, position and direction are documented.<small>Housing radial, thrust-housing axial, shaft radial and permitted gearbox-bearing evidence are not interchangeable.<\/small><\/span><\/label>\n              <label class=\"ge-check\"><input id=\"ge-ev-quantity\" type=\"checkbox\"><span>Quantity, amplitude convention, unit, band and processing are documented.<small>A bare mm\/s or &micro;m number cannot establish a current criterion.<\/small><\/span><\/label>\n              <label class=\"ge-check\"><input id=\"ge-ev-operation\" type=\"checkbox\"><span>Operating state and steady\/change\/transient basis are documented.<small>The official public record distinguishes all three evaluation contexts.<\/small><\/span><\/label>\n              <label class=\"ge-check\"><input id=\"ge-ev-licensed\" type=\"checkbox\"><span>Every numerical criterion comes from the licensed current standard.<small>Exact clauses, tables, notes, measurement conditions and boundary convention are recorded outside this website.<\/small><\/span><\/label>\n              <label class=\"ge-check\"><input id=\"ge-ev-site\" type=\"checkbox\"><span>Manufacturer, site and protection-system limits are separately controlled.<small>No web zone is substituted for alarm or trip philosophy.<\/small><\/span><\/label>\n              <label class=\"ge-check\"><input id=\"ge-ev-report\" type=\"checkbox\"><span>The report, dataset and measurement chain are traceable.<small>Evidence is linked to the exact machine, state, position, date and instrument chain.<\/small><\/span><\/label>\n              <label class=\"ge-check\"><input id=\"ge-ev-review\" type=\"checkbox\"><span>An accountable qualified reviewer applies the licensed procedure.<small>This website never supplies a zone, diagnosis, acceptance result or operating instruction.<\/small><\/span><\/label>\n            <\/div>\n          <\/fieldset>\n          <div class=\"ge-actions\"><button class=\"ge-btn\" type=\"submit\">Check evidence completeness<\/button><button class=\"ge-btn ge-btn-secondary\" id=\"ge-clear\" type=\"button\">Clear worksheet<\/button><\/div>\n          <div class=\"ge-result\" id=\"ge-result\" role=\"status\" aria-live=\"polite\">\n            <h3 id=\"ge-result-title\">Not assessed<\/h3><p id=\"ge-result-summary\"><\/p><ul id=\"ge-result-list\"><\/ul>\n            <p class=\"ge-result-note\">This output is not an ISO zone, diagnosis, alarm, trip setpoint, acceptance result or instruction to continue, maintain, reduce load or stop a machine.<\/p>\n          <\/div>\n        <\/form>\n      <\/div>\n    <\/section>\n\n    <aside class=\"ge-card\" aria-labelledby=\"ge-boundary-title\">\n      <h2 class=\"ge-card-head\" id=\"ge-boundary-title\">Verified public applicability boundary<\/h2>\n      <div class=\"ge-card-body\">\n        <span class=\"ge-status\">VERIFIED_OFFICIAL_STANDARD_RECORD<\/span>\n        <ul class=\"ge-side-list\">\n          <li>ISO 20816-4:2018 Edition 1 is published and was confirmed in 2023 (stage 90.93).<\/li>\n          <li>It applies to land-based gas turbines with fluid-film bearings, outputs above 3 MW and operating speeds under load from 3 000 to 30 000 r\/min.<\/li>\n          <li>Above 40 MW at 1 500, 1 800, 3 000 or 3 600 r\/min is directed to ISO 20816-2, which has published Amendment 1:2024.<\/li>\n          <li>Aero-derivatives and gas turbines with similar dynamic properties are excluded.<\/li>\n          <li>Machines at or below 3 MW and rolling-element-bearing vibration are excluded.<\/li>\n          <li>Turbine-driven generators, pumps and rotary compressors are excluded from this part.<\/li>\n          <li>Permitted public measurement targets include main-bearing housing\/pedestal structural vibration, thrust-bearing housing axial vibration and shaft radial vibration at or near main bearings.<\/li>\n          <li>Gearbox main input\/output bearing vibration can be evaluated in limited circumstances; internal gearbox bearings and gear-condition assessment are not covered.<\/li>\n          <li>Combustion-vibration evaluation is excluded, although monitoring is not precluded.<\/li>\n        <\/ul>\n        <div class=\"ge-needs\"><strong>NEEDS_LICENSED_SOURCE<\/strong><br>Exact zone boundaries, frequency bands, amplitude conventions, change criteria, boundary inclusivity, alarm\/trip relationships and operating-limit procedures are protected. No numerical zone boundary is reproduced or inferred here.<\/div>\n      <\/div>\n    <\/aside>\n  <\/div>\n\n  <section class=\"ge-section\" aria-labelledby=\"ge-facts-title\">\n    <h2 id=\"ge-facts-title\">What was corrected<\/h2>\n    <div class=\"ge-section-body ge-facts\">\n      <div class=\"ge-fact\"><strong>Aero-derivative classification removed.<\/strong> The former page classified aero-derivative machines even though the official current abstract explicitly excludes them and dynamically similar turbines.<\/div>\n      <div class=\"ge-fact\"><strong>Small-turbine classification removed.<\/strong> The former page applied ISO 20816-4 zones below 3 MW; the official scope requires output above 3 MW.<\/div>\n      <div class=\"ge-fact\"><strong>Rolling-bearing shortcut removed.<\/strong> The former explanation included aero-derived rolling-element-bearing machines although this vibration is excluded.<\/div>\n      <div class=\"ge-fact\"><strong>Six copied configurations removed.<\/strong> The same two boundary triplets were applied across three turbine labels; changing the turbine type did not change either threshold set.<\/div>\n      <div class=\"ge-fact\"><strong>Automatic operating actions removed.<\/strong> One scalar no longer generates &#8220;unrestricted&#8221;, remedial or immediate-action wording without the licensed procedure and plant evidence.<\/div>\n      <div class=\"ge-fact\"><strong>Protection-setpoint advice removed.<\/strong> Unverified website boundaries must never be aligned with alarm or trip setpoints.<\/div>\n      <div class=\"ge-fact\"><strong>Measurement scope made explicit.<\/strong> Structural and shaft vibration positions, directions, signal convention, band, operating state and trend\/change basis must be documented.<\/div>\n      <div class=\"ge-fact\"><strong>No website formula is applied.<\/strong> Exact closed numerical criteria remain NEEDS_LICENSED_SOURCE rather than being guessed from withdrawn or unrelated tables.<\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"ge-section\" aria-labelledby=\"ge-sources-title\">\n    <h2 id=\"ge-sources-title\">Standard and source register<\/h2>\n    <div class=\"ge-section-body ge-source-wrap\">\n      <table class=\"ge-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\/74450.html\" rel=\"noopener\" target=\"_blank\">ISO 20816-4:2018<\/a><br>Edition 1 &#8211; published &#8211; confirmed at stage 90.93<\/td><td>Land-based, fluid-film-bearing, power and speed scope; nine exclusions; eligible measurement positions\/directions; steady, transient and change contexts; predecessor lifecycle.<\/td><td>Closed numerical zones, exact bands, amplitude conventions, change criteria, boundary rules, protection setpoints and operating-limit procedure.<\/td><\/tr>\n          <tr id=\"source-S2\"><td>S2<\/td><td><a href=\"https:\/\/www.iso.org\/standard\/70047.html\" rel=\"noopener\" target=\"_blank\">ISO 20816-2:2017<\/a> with <a href=\"https:\/\/www.iso.org\/standard\/87294.html\" rel=\"noopener\" target=\"_blank\">Amendment 1:2024<\/a><br>Published and current official records<\/td><td>Route for land-based gas turbines above 40 MW with fluid-film bearings at rated speeds 1 500, 1 800, 3 000 or 3 600 r\/min; amendment lifecycle.<\/td><td>No authorization to apply Part 2 criteria to a Part 4 machine, or to reproduce protected criteria.<\/td><\/tr>\n          <tr id=\"source-S3\"><td>S3<\/td><td><a href=\"https:\/\/www.iso.org\/standard\/40458.html\" rel=\"noopener\" target=\"_blank\">ISO 10816-4:2009<\/a><br>Edition 2 and Amendment 1:2017 withdrawn; revised by ISO 20816-4:2018<\/td><td>The predecessor lifecycle and former non-rotating-part scope.<\/td><td>No proof that former numerical values, criteria or actions are unchanged in ISO 20816-4:2018.<\/td><\/tr>\n        <\/tbody>\n      <\/table>\n    <\/div>\n  <\/section>\n\n  <section class=\"ge-section ge-notes\" aria-labelledby=\"ge-notes-title\">\n    <h2 id=\"ge-notes-title\">Review notes<\/h2>\n    <div class=\"ge-section-body\">\n      <details><summary>Why does this page no longer output Zone A, B, C or D?<\/summary><p>The former six configurations lacked a checked licensed ISO 20816-4:2018 clause\/table, complete applicability and measurement conditions, and a verified boundary convention. Three of those configurations were explicitly outside the public scope. A numeric zone would therefore be unsupported.<\/p><\/details>\n      <details><summary>Does ISO 20816-4 cover aero-derivative gas turbines?<\/summary><p>No. The official current abstract explicitly excludes aero-derivatives and gas turbines with similar dynamic properties because materially different criteria apply.<\/p><\/details>\n      <details><summary>Does ISO 20816-4 cover small turbines or rolling-element bearings?<\/summary><p>No generic rule is provided here. The official current abstract excludes gas turbines at or below 3 MW and rolling-element-bearing vibration from this part.<\/p><\/details>\n      <details><summary>Can a bearing-housing velocity or shaft-displacement value alone establish a safe alarm or trip?<\/summary><p>No. Applicability, position, direction, quantity, amplitude convention, band, processing, operating state, trend, licensed criteria, OEM\/site limits and protection philosophy must all be controlled.<\/p><\/details>\n      <details><summary>Can this worksheet recommend continued operation, maintenance 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=\"ge-foot\">Source access: 17 July 2026. No closed ISO clause, amendment text, table, coefficient or zone boundary is copied or inferred. The former automatic classifications and protection 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('ge-form'),result=document.getElementById('ge-result'),title=document.getElementById('ge-result-title'),summary=document.getElementById('ge-result-summary'),list=document.getElementById('ge-result-list');\nvar requiredFields=['ge-site','ge-family','ge-power','ge-speed','ge-special-speed','ge-bearing','ge-train','ge-target','ge-basis','ge-purpose','ge-machine-id','ge-position','ge-direction','ge-quantity','ge-unit','ge-value','ge-band','ge-operation','ge-change','ge-chain','ge-source-ref','ge-report','ge-reviewer'];\nvar 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conflicts=[],site=document.getElementById('ge-site').value,family=document.getElementById('ge-family').value,power=document.getElementById('ge-power').value,speed=document.getElementById('ge-speed').value,special=document.getElementById('ge-special-speed').value,bearing=document.getElementById('ge-bearing').value,train=document.getElementById('ge-train').value,target=document.getElementById('ge-target').value,basis=document.getElementById('ge-basis').value,purpose=document.getElementById('ge-purpose').value;\n  if(site!=='land')conflicts.push('ISO 20816-4:2018 public scope requires a land-based gas turbine.');\n  if(family!=='heavy')conflicts.push('Aero-derivatives, dynamically similar machines and an unknown turbine family are outside the verified public applicability boundary.');\n  if(power==='le3'||power==='unknown')conflicts.push('ISO 20816-4:2018 public scope requires gas-turbine output above 3 MW.');\n  if(speed!=='within')conflicts.push('The operating speed under load must be 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if(validTargets.indexOf(target)===-1)conflicts.push('The selected vibration target is excluded or outside the verified public measurement boundary.');\n  if(target==='gearbox-main-io'&&train!=='gearbox')conflicts.push('A gearbox input\/output bearing target requires a documented gearbox in the train.');\n  if(train==='gearbox'&&target!=='gearbox-main-io'&&['housing-radial','thrust-axial','shaft-radial'].indexOf(target)===-1)conflicts.push('The gearbox measurement target is not established.');\n  if(['steady','transient','change'].indexOf(basis)===-1)conflicts.push('Document whether the evaluation concerns steady vibration, a transient or a change in steady vibration.');\n  if(purpose!=='broadband-severity')conflicts.push('Gearbox\/gear diagnosis, combustion vibration and rolling-element-bearing evaluation are outside this worksheet.');\n  return conflicts;\n}\nform.addEventListener('submit',function(event){event.preventDefault();clearList();var 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