{"id":56814,"date":"2026-09-11T08:28:01","date_gmt":"2026-09-11T08:28:01","guid":{"rendered":"https:\/\/zobai.com\/?p=56814"},"modified":"2026-10-27T04:22:45","modified_gmt":"2026-10-27T04:22:45","slug":"pilot-operated-safety-valve-maintenance-filters-tubing-seals-and-functional-tests","status":"publish","type":"post","link":"https:\/\/zobai.com\/fr\/blog\/pilot-operated-safety-valve-maintenance-filters-tubing-seals-and-functional-tests\/","title":{"rendered":"Maintenance des soupapes de s\u00fbret\u00e9 pilot\u00e9es : filtres, tuyauterie, joints et essais fonctionnels"},"content":{"rendered":"<style>\n.zobai-posv-maintenance { max-width: 100%; }\n.zobai-posv-maintenance .posv-table-wrap { width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 1.25rem 0 1.5rem; }\n.zobai-posv-maintenance .posv-table-wrap:focus { outline: 2px solid currentColor; outline-offset: 2px; }\n.zobai-posv-maintenance table { width: 100%; min-width: 640px; border-collapse: collapse; }\n.zobai-posv-maintenance th, .zobai-posv-maintenance td { padding: 0.75rem; text-align: left; vertical-align: top; border: 1px solid rgba(0, 0, 0, 0.14); }\n.zobai-posv-maintenance th { font-weight: 700; }\n.zobai-posv-maintenance .posv-decision-line { margin: 1.25rem 0; padding-left: 1rem; border-left: 3px solid currentColor; }\n.zobai-posv-maintenance .posv-cta { margin-top: 2rem; padding: 1.25rem; border: 1px solid rgba(0, 0, 0, 0.14); }\n.zobai-posv-maintenance .posv-source-note { font-size: 0.95em; }\n.zobai-posv-maintenance .posv-illustrative { margin: 1.25rem 0; padding: 1rem; border: 1px solid rgba(0, 0, 0, 0.14); }\n.zobai-posv-maintenance .posv-faq h3 { margin-top: 1.35rem; }\n@media (max-width: 480px) { .zobai-posv-maintenance th, .zobai-posv-maintenance td { padding: 0.65rem; } }\n<\/style>\n<article class=\"zobai-posv-maintenance\">\n<p>\n  Une soupape de s\u00fbret\u00e9 pilot\u00e9e ne doit pas \u00eatre entretenue comme si le pilote \u00e9tait<br \/>\n  simplement un accessoire boulonn\u00e9 sur la soupape principale. Le pilote, les filtres, les raccordements<br \/>\n  de d\u00e9tection ou d'alimentation, la tuyauterie de commande, les joints et la soupape principale forment un seul syst\u00e8me<br \/>\n  de r\u00e9gulation de pression. La contamination, les fuites, les restrictions ou un circuit de pression<br \/>\n  mal r\u00e9tabli peuvent avoir des cons\u00e9quences m\u00eame lorsque le corps de la soupape principale semble en bon \u00e9tat.\n<\/p>\n<p>\n  La deuxi\u00e8me erreur de maintenance consiste \u00e0 consid\u00e9rer chaque \u201c essai \u201d apr\u00e8s maintenance comme \u00e9quivalent.<br \/>\n  Un contr\u00f4le de la pression de tarage du pilote, un essai d'\u00e9tanch\u00e9it\u00e9 du si\u00e8ge, un essai d'\u00e9tanch\u00e9it\u00e9 de l'assemblage,<br \/>\n  un essai fonctionnel de l'assemblage complet et un essai de capacit\u00e9 de d\u00e9bit r\u00e9pondent \u00e0 des<br \/>\n  questions diff\u00e9rentes. Un r\u00e9sultat R\u00c9USSI n'est utile que dans le cadre de l'essai qui l'a produit.\n<\/p>\n<p>Cet article suit donc deux r\u00e8gles :<\/p>\n<ol>\n<li><strong>Inspecter le circuit r\u00e9el du pilote et de la commande install\u00e9 sur la soupape.<\/strong><\/li>\n<li><strong>Adapter l'essai aux preuves n\u00e9cessaires avant la remise en service.<\/strong><\/li>\n<\/ol>\n<p>\n  Cet article utilise <strong>soupape de s\u00fbret\u00e9 pilot\u00e9e<\/strong> comme terme de travail.<br \/>\n  La documentation du fabricant et des normes peut \u00e9galement utiliser<br \/>\n  <em>Soupape de s\u00fbret\u00e9 pilot\u00e9e<\/em>, <em>POSV<\/em> ou <em>POSRV<\/em>.<br \/>\n  L'ISO 4126-4 est la norme produit ISO sp\u00e9cifique aux soupapes de s\u00fbret\u00e9 pilot\u00e9es ;<br \/>\n  L'ISO pr\u00e9cise qu'il s'agit d'une norme de produit, et non d'une norme d'application. Elle ne remplace donc<br \/>\n  pas le manuel de maintenance sp\u00e9cifique au mod\u00e8le, la proc\u00e9dure du propri\u00e9taire ni<br \/>\n  les exigences de remise en service de l'autorit\u00e9 comp\u00e9tente. Voir<br \/>\n  <a href=\"https:\/\/www.iso.org\/standard\/50827.html\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">ISO 4126-4<\/a>.<br \/>\n  Si la s\u00e9quence de fonctionnement elle-m\u00eame n'est pas encore claire, voir<br \/>\n  <a href=\"https:\/\/zobai.com\/fr\/blog\/how-does-a-pilot-operated-safety-valve-work\/\">comment fonctionne une soupape de s\u00fbret\u00e9 pilot\u00e9e<\/a>.\n<\/p>\n<section>\n<h2>Avant toute maintenance, confirmez la configuration de la soupape et son \u00e9tat initial<\/h2>\n<p>\n  Avant de nettoyer un filtre, de d\u00e9connecter une tuyauterie ou de remplacer des joints,<br \/>\n  d\u00e9terminez pr\u00e9cis\u00e9ment sur quel ensemble soupape principale, pilote et dispositif de d\u00e9tection vous intervenez.<br \/>\n  Les conceptions pilot\u00e9es diff\u00e8rent par la mani\u00e8re dont la pression d'entr\u00e9e atteint le pilote, selon que la d\u00e9tection<br \/>\n  est int\u00e9gr\u00e9e ou d\u00e9port\u00e9e, selon le cheminement de la pression de d\u00f4me\/commande, l'emplacement des filtres<br \/>\n  et les composants entretenus ou test\u00e9s en tant qu'ensembles distincts.\n<\/p>\n<p>\n  Une \u00e9tape de maintenance valable pour une configuration ne doit pas \u00eatre transpos\u00e9e<br \/>\n  automatiquement \u00e0 une autre. Le manuel Anderson Greenwood S\u00e9rie 727, par exemple,<br \/>\n  couvre les configurations \u00e0 d\u00e9tection interne, \u00e0 d\u00e9tection d\u00e9port\u00e9e et \u00e0 amortisseur, et fournit des<br \/>\n  instructions sp\u00e9cifiques pour ces configurations. Le manuel Baker Hughes Consolidated 2900-40<br \/>\n  de m\u00eame, distingue les options de d\u00e9tection \u00e0 distance et de bague de d\u00e9tection. Ces fabricants<br \/>\n  exemples \u00e9tayent la m\u00eame r\u00e8gle g\u00e9n\u00e9rale de maintenance : identifier le chemin de pression exact<br \/>\n  avant de l'ouvrir ou de le remettre en service. Voir<br \/>\n  <a href=\"https:\/\/www.emerson.com\/is\/content\/emerson\/en\/final-control\/pressure-management\/documents\/manuals-series-727-pilot-operated-safety-relief-valves-anderson-greenwood-en.pdf\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">les instructions de maintenance de la s\u00e9rie 727 Anderson Greenwood<\/a><br \/>\n  et<br \/>\n  <a href=\"https:\/\/dam.bakerhughes.com\/m\/68cc49de3da6a293\/original\/Consolidated-2900-40-POSRV-Manual-English.pdf\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">Manuel Baker Hughes Consolidated 2900-40 POSRV<\/a>.\n<\/p>\n<p>Commencez par confirmer :<\/p>\n<ul>\n<li>l'identification de la soupape principale et du pilote, y compris les informations de mod\u00e8le\/num\u00e9ro de s\u00e9rie n\u00e9cessaires pour obtenir la proc\u00e9dure et les pi\u00e8ces correctes ;<\/li>\n<li>les instructions de maintenance du fabricant applicables et la proc\u00e9dure du propri\u00e9taire ;<\/li>\n<li>la configuration de d\u00e9tection, y compris la d\u00e9tection \u00e0 distance, les amortisseurs ou les raccords d'essai sur site lorsqu'ils sont utilis\u00e9s ;<\/li>\n<li>le fluide de proc\u00e9d\u00e9 et les conditions de service pertinentes pour la contamination, la corrosion, la compatibilit\u00e9 des \u00e9lastom\u00e8res et les d\u00e9p\u00f4ts ;<\/li>\n<li>la raison pour laquelle la soupape a \u00e9t\u00e9 d\u00e9pos\u00e9e, inspect\u00e9e ou ouverte ;<\/li>\n<li>l'\u00e9tat initial avant que le nettoyage ou le d\u00e9montage n'\u00e9limine les preuves ; et<\/li>\n<li>les enregistrements pertinents des essais ou de la maintenance pr\u00e9c\u00e9dents, s'ils sont disponibles.<\/li>\n<\/ul>\n<p>\n  Les interventions sur le syst\u00e8me sous pression ou sur le syst\u00e8me pilote doivent respecter les proc\u00e9dures applicables d'isolation et de d\u00e9pressurisation de<br \/>\n  les proc\u00e9dures d'isolation et de d\u00e9pressurisation de l'installation et du fabricant. La s\u00e9rie 727<br \/>\n  manuel, par exemple, avertit que le syst\u00e8me doit \u00eatre d\u00e9pressuris\u00e9 avant la soupape<br \/>\n  d\u00e9montage ou d\u00e9pose et remarques indiquant que du fluide peut rester pi\u00e9g\u00e9 dans l'espace du d\u00f4me<br \/>\n  d'une soupape de s\u00fbret\u00e9 pilot\u00e9e. Il s'agit d'une instruction propre au produit, et non d'une<br \/>\n  s\u00e9quence d'isolement universelle. Le plan d'isolement du site doit correspondre \u00e0 l'<br \/>\n  installation r\u00e9elle et aux dangers.\n<\/p>\n<p>\n  Pr\u00e9server l' <strong>\u00e9tat tel que constat\u00e9<\/strong> avant le nettoyage \u00e9limine des<br \/>\n  preuves utiles. Un filtre colmat\u00e9, un produit de corrosion dans un raccord de prise de pression, une fuite autour<br \/>\n  a pilot connection, an incorrectly connected line or an unexpected deposit can<br \/>\n  explain why the assembly behaved abnormally. API RP 576 covers inspection and<br \/>\n  repair practices for pressure-relieving devices, including pilot-operated PRVs,<br \/>\n  and its current API catalog entry emphasizes inspection\/repair practices intended<br \/>\n  to support proper device performance. See<br \/>\n  <a href=\"https:\/\/www.api.org\/-\/media\/files\/publications\/2025-catalog\/06_refining_2025.pdf\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">API RP 576 in the API refining catalog<\/a>.\n<\/p>\n<p>\n  Pour le programme de maintenance complet de la soupape, la planification des inspections et<br \/>\n  le contexte tel que constat\u00e9\/tel que laiss\u00e9, voir le<br \/>\n  <a href=\"https:\/\/zobai.com\/fr\/blog\/safety-valve-maintenance-and-inspection-guide\/\">Guide de maintenance et d'inspection des soupapes de s\u00fbret\u00e9<\/a>.<br \/>\n  The present article stays focused on the pilot\/control path and the evidence<br \/>\n  needed after work on filters, tubing, seals and functional tests.\n<\/p>\n<p class=\"posv-decision-line\">\n  <strong>D\u00e9cision de maintenance :<\/strong> Do not diagnose or replace the component<br \/>\n  until the configuration around it is known well enough to explain what pressure<br \/>\n  the component should receive, retain, vent or transmit.\n<\/p>\n<\/section>\n<section>\n<h2>Inspecter les filtres comme partie int\u00e9grante du circuit de pilotage, et non comme un \u00e9l\u00e9ment isol\u00e9<\/h2>\n<p>\n  On pilot-operated valve designs that use a filter in the sensing or pilot-supply<br \/>\n  path, filter condition can tell you more than whether the filter itself needs<br \/>\n  attention. A filter is part of the pressure path feeding the pilot system.<br \/>\n  If that path is restricted, the problem is not \u201cdirty hardware\u201d in the abstract;<br \/>\n  it is whether the pilot receives and responds to the pressure signal in the way<br \/>\n  the design requires.\n<\/p>\n<p>\n  Un filtre contamin\u00e9 ne <strong>pas<\/strong> prove that the pilot is blocked.<br \/>\n  It does provide evidence that the same contaminant may have reached adjacent<br \/>\n  passages, fittings or pilot components. The maintenance response should therefore<br \/>\n  suivre le trajet de contamination plut\u00f4t que de s'arr\u00eater \u00e0 la premi\u00e8re pi\u00e8ce encrass\u00e9e.\n<\/p>\n<p>\n  Les instructions du fabricant montrent \u00e9galement pourquoi il n'existe pas de r\u00e8gle universelle en mati\u00e8re de filtre.<br \/>\n  Dans le manuel de la s\u00e9rie 727 d'Anderson Greenwood, l'ensemble filtre du clapet principal est<br \/>\n  d\u00e9pos\u00e9 pour nettoyage et inspection et peut \u00eatre r\u00e9utilis\u00e9 s'il n'est pas endommag\u00e9,<br \/>\n  tandis que le joint d'orifice de filtre associ\u00e9 est mis au rebut et remplac\u00e9. D'autres familles<br \/>\n  de soupapes peuvent utiliser des montages de filtre et des r\u00e8gles de remplacement diff\u00e9rents. L'action<br \/>\n  correcte est celle sp\u00e9cifi\u00e9e pour la configuration exacte de la soupape, et non \u201c toujours r\u00e9utiliser \u201d<br \/>\n  ou \u201c toujours remplacer \u201d.\u201d\n<\/p>\n<div class=\"posv-table-wrap\" role=\"region\" aria-label=\"Filter findings and maintenance implications\" tabindex=\"0\">\n<table>\n<thead>\n<tr>\n<th scope=\"col\">Constat sur le filtre<\/th>\n<th scope=\"col\">Ce qui doit changer<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Propre et non endommag\u00e9<\/td>\n<td>\n          Poursuivre l'inspection requise du reste du circuit pilote. Un filtre propre<br \/>\n          ne prouve pas que les passages de d\u00e9tection, les raccords, les si\u00e8ges de pilote ou les<br \/>\n          connexions de commande sont exempts de restriction ou de fuite.\n        <\/td>\n<\/tr>\n<tr>\n<td>Contamination importante<\/td>\n<td>\n          Inspecter le circuit de commande raccord\u00e9 pour d\u00e9tecter toute contamination ou<br \/>\n          restreindre et documenter le type de contaminant avant le nettoyage lorsque cela est possible.\n        <\/td>\n<\/tr>\n<tr>\n<td>Endommag\u00e9 ou inacceptable selon la proc\u00e9dure applicable<\/td>\n<td>\n          Suivre l'exigence de remplacement propre au mod\u00e8le et v\u00e9rifier la bonne<br \/>\n          pi\u00e8ce de rechange.\n        <\/td>\n<\/tr>\n<tr>\n<td>Contamination importante r\u00e9p\u00e9t\u00e9e<\/td>\n<td>\n          Examiner pourquoi la contamination continue d'atteindre le syst\u00e8me pilote au lieu de<br \/>\n          traiter chaque entretien de filtre comme un \u00e9v\u00e9nement de maintenance isol\u00e9.\n        <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<aside class=\"posv-illustrative\">\n<p>\n    <strong>Sc\u00e9nario de maintenance illustratif \u2014 colmatage r\u00e9current du filtre.<\/strong><br \/>\n    Un filtre est trouv\u00e9 fortement colmat\u00e9 en service, nettoy\u00e9 ou remplac\u00e9, puis<br \/>\n    pr\u00e9sente une contamination similaire lors de l'\u00e9v\u00e9nement de maintenance suivant. R\u00e9p\u00e9ter la t\u00e2che<br \/>\n    de filtre seule n'identifie pas la cause. La question d'ing\u00e9nierie devient de savoir si<br \/>\n    des d\u00e9p\u00f4ts en amont, du condensat, des produits de corrosion ou des solides de proc\u00e9d\u00e9 p\u00e9n\u00e8trent dans<br \/>\n    le circuit de d\u00e9tection\/alimentation et si les passages connect\u00e9s sont \u00e9galement restreints.<br \/>\n    La voie corrective consiste \u00e0 pr\u00e9server les preuves telles que constat\u00e9es, \u00e0 inspecter les<br \/>\n    circuit pilote aval, v\u00e9rifier l'exigence exacte de filtre pour la soupape, et<br \/>\n    examiner la source de contamination si le constat se r\u00e9p\u00e8te.\n  <\/p>\n<\/aside>\n<p>\n  La fr\u00e9quence de maintenance pr\u00e9sente la m\u00eame limite. L'API RP 576 est une r\u00e9f\u00e9rence de pratique d'inspection,<br \/>\n  mais ni ce domaine d'application ni les manuels du fabricant examin\u00e9s ici<br \/>\n  ne justifient un intervalle universel de nettoyage du filtre pour chaque soupape pilot\u00e9e.<br \/>\n  La fr\u00e9quence doit \u00eatre bas\u00e9e sur la proc\u00e9dure applicable, la s\u00e9v\u00e9rit\u00e9 du service, l'historique de contamination<br \/>\n  et le programme d'inspection du propri\u00e9taire.\n<\/p>\n<p>\n  <strong>L'\u00e9tat du filtre peut donc constituer une preuve diagnostique sur l'environnement<br \/>\n  vu par le syst\u00e8me pilote, et non un simple \u00e9l\u00e9ment d'entretien.<\/strong>\n<\/p>\n<\/section>\n<section>\n<h2>V\u00e9rifier l'obstruction, les fuites et les erreurs de remontage des tubes de d\u00e9tection et de commande<\/h2>\n<p>\n  Tous les petits tubes autour d'une soupape de s\u00fbret\u00e9 pilot\u00e9e n'ont pas la m\u00eame fonction.<br \/>\n  Selon la conception, la documentation peut distinguer une ligne de d\u00e9tection de pression,<br \/>\n  un raccordement d'alimentation du pilote, une ligne de d\u00f4me\/commande, un raccordement de d\u00e9tection \u00e0 distance, une d\u00e9charge<br \/>\n  connection and field-test connection. Before loosening a fitting, identify what<br \/>\n  pressure that line is supposed to communicate and to which component.\n<\/p>\n<p>\n  Manufacturer maintenance instructions reinforce this point. The Series 727 manual<br \/>\n  calls for inspection of remote-sense and snubber fittings for blockage in applicable<br \/>\n  configurations. Baker Hughes&#8217; 2900-40 manual shows that remote sensing is its standard<br \/>\n  pilot pressure connection while a sensing-ring option changes the pickup location.<br \/>\n  These are design-specific arrangements, but together they show why \u201cthe tubing looks<br \/>\n  similar\u201d is not enough to establish correct routing.\n<\/p>\n<p>Les probl\u00e8mes de tubes doivent donc \u00eatre class\u00e9s par mode de d\u00e9faillance.<\/p>\n<div class=\"posv-table-wrap\" role=\"region\" aria-label=\"Pilot sensing and control tubing failure modes\" tabindex=\"0\">\n<table>\n<thead>\n<tr>\n<th scope=\"col\">Trouver<\/th>\n<th scope=\"col\">Pourquoi c'est important<\/th>\n<th scope=\"col\">Contr\u00f4le de maintenance<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Obstruction ou colmatage<\/td>\n<td>\n          The intended pressure signal or pilot-supply path may be delayed,<br \/>\n          attenuated or prevented from reaching the intended component.\n        <\/td>\n<td>\n          Inspect the affected passage, fitting, snubber\/filter and connected<br \/>\n          pilot components using the applicable procedure.\n        <\/td>\n<\/tr>\n<tr>\n<td>Fuite<\/td>\n<td>\n          Pressure integrity in the sensing, dome or control path may be lost.<br \/>\n          The effect depends on where the leak is located in the circuit.\n        <\/td>\n<td>\n          Identify the leaking joint\/component and perform the specified<br \/>\n          post-assembly leakage check after correction.\n        <\/td>\n<\/tr>\n<tr>\n<td>Pliure, corrosion ou dommage m\u00e9canique<\/td>\n<td>\n          The flow area or mechanical integrity may no longer match the intended<br \/>\n          configuration.\n        <\/td>\n<td>\n          Repair or replace with the specified material, size and routing from<br \/>\n          approved documentation.\n        <\/td>\n<\/tr>\n<tr>\n<td>Reconnexion desserr\u00e9e ou incorrecte<\/td>\n<td>\n          The valve may no longer sense, load or vent pressure through the intended path.\n        <\/td>\n<td>\n          Compare routing and connection points with the correct valve\/manifold documentation,<br \/>\n          then leak-check the restored connection as required.\n        <\/td>\n<\/tr>\n<tr>\n<td>Modification non v\u00e9rifi\u00e9e d'une ligne de d\u00e9tection \u00e0 distance<\/td>\n<td>\n          The sensing point or line characteristics may no longer match the engineered configuration.\n        <\/td>\n<td>\n          Return the arrangement for engineering\/manufacturer review instead of<br \/>\n          normalizing the modification during maintenance.\n        <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>\n  La distinction entre <strong>restriction<\/strong> et <strong>fuite<\/strong><br \/>\n  is important because the failure mechanisms differ. A restricted path can impair<br \/>\n  pressure communication. A leak changes pressure integrity. The same symptom at the<br \/>\n  valve may therefore have different causes, and the maintenance evidence needed to<br \/>\n  close the job is not interchangeable.\n<\/p>\n<p>\n  Remote sensing deserves particular discipline. Do not shorten, resize, reroute or<br \/>\n  reconnect a sensing line merely because the new arrangement physically fits. The<br \/>\n  sensing point, line routing, fittings and any filter\/snubber arrangement are part of<br \/>\n  the approved pressure path.\n<\/p>\n<p class=\"posv-decision-line\">\n  <strong>R\u00e8gle de maintenance :<\/strong> Restore the documented pressure path, then verify<br \/>\n  the applicable connections for restriction and leakage. If the approved routing<br \/>\n  cannot be established, hold the valve for engineering or manufacturer review.\n<\/p>\n<aside class=\"posv-illustrative\">\n<p>\n    <strong>Illustrative maintenance scenario \u2014 a remote-sensing line is reconnected<br \/>\n    to the wrong port after overhaul.<\/strong> The tubing is intact and does not leak,<br \/>\n    yet the pilot no longer receives pressure from the intended sensing point. A visual<br \/>\n    \u201cno damage\u201d inspection would miss the error. The cause is configuration, not tubing<br \/>\n    condition. Prevention is to identify\/tag the lines before disassembly, compare the<br \/>\n    restored routing with the exact valve documentation, and include connection integrity<br \/>\n    in the post-assembly check.\n  <\/p>\n<\/aside>\n<p>\n  For maintenance closeout, \u201cthe tubing looks fine\u201d is weaker evidence than confirming<br \/>\n  that the correct pressure path has been restored and checked for the restriction and<br \/>\n  leakage modes relevant to the applicable procedure.\n<\/p>\n<figure class=\"wp-block-image size-full zobai-figure\" data-image-slot=\"IMG-01\"><img loading=\"lazy\" src=\"https:\/\/zobai.com\/wp-content\/uploads\/2026\/09\/pilot-operated-maintenance-img-01.webp\" alt=\"Sch\u00e9ma conceptuel du circuit de commande d&#039;une soupape de s\u00fbret\u00e9 pilot\u00e9e montrant les risques de colmatage du filtre, de restriction du tube, de fuite et de reconnexion incorrecte.\" title=\"Pilot Operated Safety Valve Maintenance: Filters, Tubing, Seals and Functional Tests - IMG-01\" width=\"1200\" height=\"900\" class=\"wp-image-56880\" decoding=\"async\" srcset=\"https:\/\/zobai.com\/wp-content\/uploads\/2026\/09\/pilot-operated-maintenance-img-01.webp 1200w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/09\/pilot-operated-maintenance-img-01-300x225.webp 300w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/09\/pilot-operated-maintenance-img-01-1024x768.webp 1024w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/09\/pilot-operated-maintenance-img-01-768x576.webp 768w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/09\/pilot-operated-maintenance-img-01-16x12.webp 16w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/09\/pilot-operated-maintenance-img-01-400x300.webp 400w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption>Les filtres, la tuyauterie, les joints et les points de reconnexion doivent \u00eatre contr\u00f4l\u00e9s comme les \u00e9l\u00e9ments d'un m\u00eame circuit de pression de pilotage.<\/figcaption><\/figure>\n<\/section>\n<section>\n<h2>\u00c9valuer les joints selon leur emplacement, leur \u00e9tat et la compatibilit\u00e9 avec le service<\/h2>\n<p>\n  A seal decision should not begin and end with, \u201cDoes this O-ring look damaged?\u201d<br \/>\n  Pilot-operated valves contain seals in different functions: some retain dome or<br \/>\n  pilot pressure, some seal the main valve, and some seal fittings or filter\/manifold<br \/>\n  joints. The consequence of damage, wrong material or wrong reuse decision depends<br \/>\n  on where the seal sits in the pressure-control system.\n<\/p>\n<p>\n  Manufacturer repair instructions also do not treat every sealing component the same<br \/>\n  way. The Anderson Greenwood Series 727 manual is a useful example: it allows the<br \/>\n  filter assembly to be reused if undamaged, while it specifically tells the technician<br \/>\n  to discard certain seals and other listed parts during the applicable repair steps.<br \/>\n  Its repair kits are selected by valve model\/serial information. That is exactly why a<br \/>\n  generic \u201creuse if it looks good\u201d rule is not defensible.\n<\/p>\n<p>Two shortcuts should therefore be avoided:<\/p>\n<blockquote>\n<p>R\u00e9utiliser tous les joints qui semblent encore en bon \u00e9tat.<\/p>\n<\/blockquote>\n<p>et<\/p>\n<blockquote>\n<p>Replace every seal on every pilot-operated valve whenever the valve is opened.<\/p>\n<\/blockquote>\n<p>Instead, separate four questions.<\/p>\n<p><strong>1. Which seal is it?<\/strong><\/p>\n<p>\n  Identify the location and function of the part. A pilot seat\/seal, main-valve sealing<br \/>\n  element, dome seal, filter-port seal and tubing\/connection seal should not inherit the<br \/>\n  same maintenance rule simply because each is called a \u201cseal.\u201d\n<\/p>\n<p><strong>2. Is the part and material correct?<\/strong><\/p>\n<p>\n  Pilot-operated valve families can use different soft goods or metallic sealing<br \/>\n  components for different pressure, temperature and process conditions. A replacement<br \/>\n  should match the approved bill of materials or repair kit for the exact configuration,<br \/>\n  not merely the apparent dimensions of the removed part.\n<\/p>\n<p>\n  For deeper material-selection context, see the<br \/>\n  <a href=\"https:\/\/zobai.com\/fr\/blog\/safety-valve-material-selection-guide\/\">guide de s\u00e9lection des mat\u00e9riaux des soupapes de s\u00fbret\u00e9<\/a>.\n<\/p>\n<p><strong>3. Is its condition acceptable?<\/strong><\/p>\n<p>\n  Inspect for the damage modes addressed by the applicable manufacturer procedure:<br \/>\n  cuts, extrusion, compression damage, wear, corrosion or deposit-related damage where<br \/>\n  relevant. Appearance can identify physical deterioration, but it cannot prove the<br \/>\n  material grade, prior chemical attack, or compatibility with the process.\n<\/p>\n<p><strong>4. Does the applicable procedure permit reuse?<\/strong><\/p>\n<p>\n  This is separate from appearance. If the model-specific procedure requires<br \/>\n  replacement during the applicable service operation, an apparently intact part is<br \/>\n  not evidence for reuse. Conversely, a part the manufacturer permits to be cleaned,<br \/>\n  inspected and reused should not be subjected to an invented universal replacement rule.\n<\/p>\n<aside class=\"posv-illustrative\">\n<p>\n    <strong>Illustrative maintenance scenario \u2014 a dimensionally similar elastomer is<br \/>\n    installed because it fits.<\/strong> The pilot passes an initial bench check, but the<br \/>\n    replacement material has not been verified for the service temperature or fluid.<br \/>\n    The problem is not visible geometry; it is unverified material compatibility.<br \/>\n    Prevention is to use the manufacturer-approved part\/material for the exact<br \/>\n    configuration or obtain documented engineering approval for a substitution, then<br \/>\n    complete the required post-assembly checks.\n  <\/p>\n<\/aside>\n<p class=\"posv-decision-line\">\n  <strong>Seal decision sequence:<\/strong><br \/>\n  identity \u2192 function \u2192 approved material\/configuration \u2192 physical condition \u2192<br \/>\n  permitted reuse\/replacement \u2192 post-assembly leakage\/functional verification.\n<\/p>\n<\/section>\n<section>\n<h2>Match the Functional Test to What You Need to Prove<\/h2>\n<p>\n  A post-maintenance test is only as broad as its test scope. Instead of asking only,<br \/>\n  \u201cDid the valve pass?\u201d ask:<br \/>\n  <strong>Which test was performed, which part of the pilot\/main-valve system did it<br \/>\n  exercise, what acceptance basis was used, and what remains untested?<\/strong>\n<\/p>\n<p class=\"posv-source-note\">\n  The standards have different roles. The current API catalog lists<br \/>\n  <a href=\"https:\/\/www.api.org\/-\/media\/files\/publications\/2025-catalog\/06_refining_2025.pdf\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">API RP 576<\/a><br \/>\n  as an inspection and repair practice covering pilot-operated PRVs;<br \/>\n  <a href=\"https:\/\/zobai.com\/fr\/standards\/api-527-seat-tightness-test\/\">API 527<\/a><br \/>\n  addresses seat tightness, with the current API digital catalog listing API 527,<br \/>\n  5th Edition, as the seat-tightness standard; and<br \/>\n  <a href=\"https:\/\/www.api.org\/products-and-services\/standards\/digital-catalog\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">API\u2019s digital catalog<\/a><br \/>\n  confirms the current API 527 entry.<br \/>\n  <a href=\"https:\/\/www.asme.org\/codes-standards\/find-codes-standards\/pressure-relief-devices\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">ASME PTC 25-2023<\/a><br \/>\n  is a performance test code for pressure relief devices and includes flow-capacity,<br \/>\n  in-service and bench testing. These documents do not make a pilot set-pressure<br \/>\n  check, seat-leakage test, assembly function test and capacity test interchangeable.\n<\/p>\n<p>\n  Manufacturer procedures make the same distinction at the equipment level. The<br \/>\n  Anderson Greenwood Series 727 manual separates valve-assembly leak tests, pilot<br \/>\n  set-pressure testing, and pilot\/manifold internal leak testing. Its field test<br \/>\n  procedure can verify pilot set pressure while the main valve does not cycle during<br \/>\n  that procedure. That is strong evidence for a narrow but important maintenance rule:<br \/>\n  <strong>a valid pilot test proves the pilot variable it actually exercises; it does<br \/>\n  not automatically prove full main-valve operation or rated flow capacity.<\/strong>\n<\/p>\n<div class=\"posv-table-wrap\" role=\"region\" aria-label=\"Post-maintenance test evidence comparison\" tabindex=\"0\">\n<table>\n<thead>\n<tr>\n<th scope=\"col\">Check or test<\/th>\n<th scope=\"col\">What the result can support<\/th>\n<th scope=\"col\">Ce qu'il ne prouve pas automatiquement<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Visual \/ configuration inspection<\/td>\n<td>Visible condition, correct routing, part identity and assembly observations within the inspection scope<\/td>\n<td>Set pressure, seat tightness, pilot response under pressure or rated flow capacity<\/td>\n<\/tr>\n<tr>\n<td>Pilot\/set-pressure verification<\/td>\n<td>Pilot actuation or set-pressure behavior under the approved test method<\/td>\n<td>Main-valve cycle, seat tightness, rated flow capacity or installed-system acceptance unless the procedure also tests those items<\/td>\n<\/tr>\n<tr>\n<td>Seat-tightness \/ leakage test<\/td>\n<td>Leakage performance for the seat or connections covered by the applicable test basis<\/td>\n<td>Complete pilot\/main-valve functional performance or flow capacity<\/td>\n<\/tr>\n<tr>\n<td>Complete-assembly functional test<\/td>\n<td>Defined operation\/integrity of the assembled pilot and main valve under that procedure<\/td>\n<td>Certified flow capacity unless capacity is actually tested under the required basis<\/td>\n<\/tr>\n<tr>\n<td>Flow-capacity test<\/td>\n<td>Flow performance under the defined test conditions<\/td>\n<td>Correct field sensing-line routing, installation condition or every maintenance detail not represented in the test setup<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h3>Pilot Set-Pressure or Pilot-Function Verification<\/h3>\n<p>\n  On applicable designs, a field-test connection can allow pilot or set-pressure<br \/>\n  behavior to be checked without reproducing every installed operating condition.<br \/>\n  The Series 727 manual provides a field-test arrangement in which the pilot can be<br \/>\n  pressurized and its pop\/set behavior observed while the main valve does not cycle<br \/>\n  during that procedure. That distinction should be preserved in the maintenance record.\n<\/p>\n<p>\n  A useful record is therefore not simply \u201cPilot test: PASS.\u201d It should identify the<br \/>\n  valve\/pilot, the test method, the set-pressure basis being checked, the medium and<br \/>\n  condition required by the procedure, and the function that was <em>pas<\/em> exercised.\n<\/p>\n<p>\n  Do not import the Series 727 test pressures, warm-up periods or tolerances into another<br \/>\n  valve family. Those values are model\/procedure-specific. Use the correct manual and<br \/>\n  project acceptance basis for the valve being maintained.\n<\/p>\n<h3>Seat-Tightness and Leakage Testing<\/h3>\n<p>\n  Seat-tightness testing answers a leakage question. API Standard 527 is specifically<br \/>\n  titled <em>\u00c9tanch\u00e9it\u00e9 du si\u00e8ge des soupapes de s\u00fbret\u00e9<\/em>, and API\u2019s current catalog<br \/>\n  lists it for pressure-relief-valve seat tightness. That makes it appropriate evidence<br \/>\n  for a seat-leakage conclusion within its scope\u2014not for the broader statement that the<br \/>\n  pilot\/main-valve control system has been functionally verified.\n<\/p>\n<p>\n  Manufacturer procedures may also require connection or internal leak checks that are<br \/>\n  outside the main-seat leakage question. The Series 727 manual, for example, separates<br \/>\n  external-joint leakage, pilot\/manifold internal seat tightness and other assembly checks.<br \/>\n  The maintenance record should say which leakage path was tested.\n<\/p>\n<h3>Complete-Valve Functional Verification<\/h3>\n<p>\n  A complete-assembly functional test is broader than a pilot-only set-pressure check<br \/>\n  because it can exercise the interaction between the pilot and main valve under the<br \/>\n  approved procedure. It is still bounded by the setup. If the procedure does not measure<br \/>\n  rated flow capacity, the result should not be reported as capacity certification.\n<\/p>\n<p>\n  Baker Hughes\u2019 Consolidated 2900-40 manual contains a distinct functional-testing<br \/>\n  section and model-specific instructions for sensing\/filter options. That is another<br \/>\n  reminder that the exact functional test depends on the valve configuration. Use the<br \/>\n  procedure for the actual assembly rather than creating a generic test sequence from<br \/>\n  another manufacturer\u2019s manual.\n<\/p>\n<p class=\"posv-decision-line\">\n  <strong>R\u00e8gle de preuve :<\/strong> A complete-assembly functional test proves the<br \/>\n  functions included in that approved procedure\u2014not every characteristic of the<br \/>\n  installed relief system.\n<\/p>\n<h3>What a Field or Functional Test Does Not Prove<\/h3>\n<p>\n  The largest post-maintenance interpretation error is to expand a narrow PASS result<br \/>\n  beyond the question that was tested.\n<\/p>\n<ul>\n<li><strong>Pilot set-pressure verification \u2260 rated capacity evidence.<\/strong><\/li>\n<li><strong>Seat-tightness PASS \u2260 complete functional proof.<\/strong><\/li>\n<li><strong>Complete-assembly functional test \u2260 flow-capacity certification.<\/strong><\/li>\n<li><strong>Bench or field valve test \u2260 proof that the entire installed sensing\/control system is restored correctly unless that configuration is represented and checked.<\/strong><\/li>\n<\/ul>\n<aside class=\"posv-illustrative\">\n<p>\n    <strong>Illustrative maintenance scenario \u2014 the pilot field test passes but the<br \/>\n    main valve was not exercised.<\/strong> The technician records \u201cvalve passed\u201d after<br \/>\n    the pilot actuates at the expected test condition. If the approved field-test method<br \/>\n    isolates the pilot and does not cycle the main valve, that wording overstates the<br \/>\n    evidence. The cause is test-scope interpretation, not necessarily a bad test.<br \/>\n    Prevention is to record exactly what the pilot test verified, complete any required<br \/>\n    assembly\/leak\/function checks, and keep capacity evidence separate unless capacity<br \/>\n    was actually tested under the applicable basis.\n  <\/p>\n<\/aside>\n<p>\n  For maintenance records and engineering review, document enough information to answer:\n<\/p>\n<ul>\n<li>What test was performed and under which approved procedure?<\/li>\n<li>What valve\/pilot configuration was tested?<\/li>\n<li>What pressure path, seat, connection or operating function was evaluated?<\/li>\n<li>What acceptance basis was used?<\/li>\n<li>What did the test not evaluate?<\/li>\n<li>Does another maintenance question still remain open?<\/li>\n<\/ul>\n<p>\n  That makes the test result usable evidence instead of a generic \u201cPASS\u201d label.<br \/>\n  A broader standards overview is available in the<br \/>\n  <a href=\"https:\/\/zobai.com\/fr\/blog\/safety-valve-standards-guide\/\">guide des normes des soupapes de s\u00fbret\u00e9<\/a>.\n<\/p>\n<\/section>\n<section>\n<h2>Decide Whether the Valve Is Ready to Return to Service<\/h2>\n<p>\n  Reassembly is not the same as maintenance closure. The return-to-service decision<br \/>\n  should combine what was found, what was corrected, whether the correct pilot\/control<br \/>\n  path was restored, whether the required seals and parts were verified, and whether<br \/>\n  the post-maintenance tests actually answer the questions created by the work.\n<\/p>\n<p>\n  Le <strong>PROCEED \/ HOLD \/ ESCALATE<\/strong> labels below are an engineering<br \/>\n  screening framework used in this article. They are not API, ASME, ISO or regulatory<br \/>\n  classifications and do not replace the valve owner\u2019s, manufacturer\u2019s or applicable<br \/>\n  jurisdictional acceptance process.\n<\/p>\n<div class=\"posv-table-wrap\" role=\"region\" aria-label=\"Pilot operated safety valve return-to-service screening\" tabindex=\"0\">\n<table>\n<thead>\n<tr>\n<th scope=\"col\">R\u00e9sultat du criblage<\/th>\n<th scope=\"col\">\u00c0 utiliser lorsque<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>PROC\u00c9DER<\/strong><\/td>\n<td>\n          The applicable maintenance scope is complete, the documented configuration<br \/>\n          is restored, required parts\/materials are verified, leakage or restriction<br \/>\n          concerns raised by the work are closed, and the required post-maintenance<br \/>\n          checks provide acceptable evidence for the questions they were intended to answer.\n        <\/td>\n<\/tr>\n<tr>\n<td><strong>EN ATTENTE<\/strong><\/td>\n<td>\n          Relevant contamination, blockage, leakage, incorrect routing, uncertain seal<br \/>\n          identity\/material, failed or ambiguous test response, or another unresolved<br \/>\n          maintenance condition remains.\n        <\/td>\n<\/tr>\n<tr>\n<td><strong>ESCALATE<\/strong><\/td>\n<td>\n          The correct configuration cannot be established, repeated contamination suggests<br \/>\n          a broader service\/system cause, test behavior conflicts with expected valve<br \/>\n          response, or the next step requires engineering\/manufacturer input outside the<br \/>\n          validated maintenance scope.\n        <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Before closeout, ask:<\/p>\n<ul>\n<li>Has a contaminated filter triggered the necessary inspection of the connected pilot path?<\/li>\n<li>Have sensing, supply, dome\/control and field-test connections been restored to the documented configuration?<\/li>\n<li>Have relevant tubing\/passages been checked for restriction and the reassembled pressure path checked for leakage as required?<\/li>\n<li>Are replacement or retained seals the correct parts\/materials for the valve and permitted by the applicable procedure?<\/li>\n<li>Did the post-maintenance test actually examine the function that the maintenance work could have affected?<\/li>\n<li>Is each PASS result being used only within the scope of that test?<\/li>\n<li>Does any unresolved finding still require engineering, manufacturer or owner review?<\/li>\n<\/ul>\n<p>\n  A useful maintenance handoff contains more than \u201cvalve failed\u201d or \u201cvalve repaired.\u201d<br \/>\n  Provide, where available, valve and pilot identification, relevant service conditions,<br \/>\n  as-found observations, filter\/tubing findings, components replaced or retained,<br \/>\n  seal\/soft-goods identification, tests performed, results\/acceptance basis, and the<br \/>\n  specific unresolved question if engineering review is still required.\n<\/p>\n<p>\n  That information helps the next reviewer distinguish a component maintenance issue<br \/>\n  from a configuration, contamination, sensing-path or wider application problem.\n<\/p>\n<p class=\"posv-decision-line\">\n  <strong>Closeout principle:<\/strong> Maintenance is not complete merely because<br \/>\n  the last part has been reassembled. It is complete when the relevant maintenance<br \/>\n  questions have been closed with evidence appropriate to each question.\n<\/p>\n<\/section>\n<aside class=\"posv-cta\">\n  <strong>Preparing an engineering or supplier review?<\/strong><\/p>\n<p>\n    Collect the valve identification, service conditions, as-found condition,<br \/>\n    components serviced, control-path findings and exact tests performed with their<br \/>\n    results. These inputs make it easier to determine whether the next step is<br \/>\n    additional testing, repair, configuration review or replacement evaluation.\n  <\/p>\n<p><a href=\"https:\/\/zobai.com\/fr\/contacts\/\">Contacter ZOBAI<\/a><\/p>\n<\/aside>\n<section class=\"posv-faq\" aria-labelledby=\"posv-maintenance-faq\">\n<h2 id=\"posv-maintenance-faq\">Frequently Asked Questions About Pilot Operated Safety Valve Maintenance<\/h2>\n<h3>Can I clean a pilot filter and return the valve to service?<\/h3>\n<p>\n  Not on the basis of the filter alone. Follow the exact manufacturer procedure for<br \/>\n  cleaning or replacement, then consider whether the as-found contamination could also<br \/>\n  have affected connected sensing\/supply passages or pilot components. A clean filter<br \/>\n  does not prove that the rest of the control path is unrestricted.\n<\/p>\n<h3>What should be checked after pilot sensing or control tubing is disconnected?<\/h3>\n<p>\n  Confirm that the documented sensing\/control path has been restored, the line is free<br \/>\n  of relevant restriction or mechanical damage, and the reassembled connections meet<br \/>\n  the required leakage\/integrity checks. Remote-sensing lines should not be resized,<br \/>\n  rerouted or reconnected to a different point without engineering or manufacturer approval.\n<\/p>\n<h3>Should every O-ring or seal be replaced whenever a pilot operated valve is opened?<\/h3>\n<p>\n  There is no safe universal rule. Some manufacturer overhaul procedures require<br \/>\n  specified seals or soft goods to be discarded and replaced, while other parts may be<br \/>\n  inspected and reused under defined conditions. Identify the exact component, approved<br \/>\n  material\/part number and model-specific procedure before deciding.\n<\/p>\n<h3>Does a pilot set-pressure test prove the whole valve works?<\/h3>\n<p>\n  Not necessarily. Some manufacturer field-test methods verify pilot set-pressure<br \/>\n  behavior without cycling the main valve. The maintenance record should state what the<br \/>\n  test exercised and what still requires another leak, functional or assembly check.\n<\/p>\n<h3>Does a seat-tightness test prove rated capacity?<\/h3>\n<p>\n  No. Seat-tightness testing evaluates leakage under its applicable test basis.<br \/>\n  Rated or certified flow capacity is a different performance question and should not<br \/>\n  be inferred from a seat-tightness PASS result.\n<\/p>\n<h3>How often should a pilot operated safety valve be inspected?<\/h3>\n<p>\n  A universal interval is not appropriate. Use the governing owner\/jurisdictional<br \/>\n  inspection program, the applicable manufacturer instructions, service severity,<br \/>\n  contamination\/corrosion history and prior as-found results. API RP 576 is an<br \/>\n  inspection-practice reference for pressure-relieving devices, including pilot-operated PRVs.\n<\/p>\n<\/section>\n<\/article>","protected":false},"excerpt":{"rendered":"<p>D\u00e9couvrez comment inspecter les filtres, les tubes de d\u00e9tection et les joints d'\u00e9tanch\u00e9it\u00e9 des soupapes de s\u00fbret\u00e9 pilot\u00e9es, puis associez les essais fonctionnels aux preuves requises avant la remise en service.<\/p>","protected":false},"author":2,"featured_media":56880,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[75],"tags":[],"class_list":["post-56814","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-installation-maintenance-troubleshooting"],"_links":{"self":[{"href":"https:\/\/zobai.com\/fr\/wp-json\/wp\/v2\/posts\/56814","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/zobai.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zobai.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zobai.com\/fr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/zobai.com\/fr\/wp-json\/wp\/v2\/comments?post=56814"}],"version-history":[{"count":0,"href":"https:\/\/zobai.com\/fr\/wp-json\/wp\/v2\/posts\/56814\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/zobai.com\/fr\/wp-json\/wp\/v2\/media\/56880"}],"wp:attachment":[{"href":"https:\/\/zobai.com\/fr\/wp-json\/wp\/v2\/media?parent=56814"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zobai.com\/fr\/wp-json\/wp\/v2\/categories?post=56814"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zobai.com\/fr\/wp-json\/wp\/v2\/tags?post=56814"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}