{"id":383,"date":"2026-09-01T03:31:06","date_gmt":"2026-09-01T03:31:06","guid":{"rendered":"https:\/\/www.deltafirst.co.uk\/blog\/written-scheme-of-examination\/"},"modified":"2026-09-01T03:31:09","modified_gmt":"2026-09-01T03:31:09","slug":"written-scheme-of-examination","status":"publish","type":"post","link":"https:\/\/www.deltafirst.co.uk\/blog\/written-scheme-of-examination\/","title":{"rendered":"Act now: written scheme of examination for UK facilities managers"},"content":{"rendered":"<\/p>\n<p>If your pressure system contains a relevant fluid and exceeds the 250 bar litres threshold, Regulation 8 of the <a href=\"https:\/\/www.legislation.gov.uk\/uksi\/2000\/128\/regulation\/8\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">Pressure Systems Safety Regulations 2000<\/a> means you cannot legally operate it without a written scheme of examination. A competent person must draw up or certify that scheme, and it has to set out exactly what gets examined, how, and how often, before the system runs.<\/p>\n<hr>\n<blockquote>\n<p><strong>TL;DR:<\/strong><\/p>\n<ul>\n<li>Pressure systems with relevant fluids and exceeding 250 bar liters must have a certified written scheme of examination to operate legally.<\/li>\n<li>A competent person, with verified qualifications and independence, is responsible for drafting, certifying, and reviewing the scheme\u2019s suitability.<\/li>\n<li>The scheme must detail plant identification, parts to examine, examination type, preparatory work, and scheduled intervals set by the competent person.<\/li>\n<li>Regular reviews are required as the system ages or undergoes modifications, with documented reasoning for any changes to examination intervals.<\/li>\n<li>Proper scope definition and technical judgment are more critical than paperwork, as incomplete or guesswork-based schemes pose compliance and safety risks.<\/li>\n<\/ul>\n<\/blockquote>\n<hr>\n<h2 id=\"table-of-contents\" tabindex=\"-1\">Table of Contents<\/h2>\n<ul>\n<li><a href=\"#what-is-a-written-scheme-of-examination-and-where-does-the-law-come-from\">What is a written scheme of examination and where does the law come from?<\/a><\/li>\n<li><a href=\"#who-counts-as-a-competent-person-and-what-must-they-actually-do\">Who counts as a competent person, and what must they actually do?<\/a><\/li>\n<li><a href=\"#what-must-a-written-scheme-of-examination-actually-contain\">What must a written scheme of examination actually contain?<\/a><\/li>\n<li><a href=\"#drawing-up-and-implementing-your-wse-a-practical-sequence\">Drawing up and implementing your WSE: a practical sequence<\/a><\/li>\n<li><a href=\"#keeping-the-scheme-suitable-as-the-system-ages\">Keeping the scheme suitable as the system ages<\/a><\/li>\n<li><a href=\"#a-practical-checklist-for-procuring-your-written-scheme\">A practical checklist for procuring your written scheme<\/a><\/li>\n<li><a href=\"#where-to-find-the-definitive-detail\">Where to find the definitive detail<\/a><\/li>\n<li><a href=\"#why-compliance-first-beats-paperwork-first\">Why compliance-first beats paperwork-first<\/a><\/li>\n<li><a href=\"#get-your-pressure-systems-compliance-sorted-with-deltafirst\">Get your pressure systems compliance sorted with Deltafirst<\/a><\/li>\n<li><a href=\"#sources\">Sources<\/a><\/li>\n<\/ul>\n<h2 id=\"what-is-a-written-scheme-of-examination-and-where-does-the-law-come-from\" tabindex=\"-1\">What is a written scheme of examination and where does the law come from?<\/h2>\n<p>A written scheme of examination (WSE) is a legal document, not a maintenance suggestion. It exists because pressure equipment fails catastrophically when nobody checks it properly, and Regulation 8 makes that check mandatory rather than optional. The obligation sits with the user of an installed system or the owner of a mobile one: no WSE, no legal operation.<\/p>\n<p>The regulation applies where a system holds a <strong>relevant fluid<\/strong>. That covers steam at any pressure, compressed gas above atmospheric pressure, and pressurised hot water at high temperature. For pressure vessels and receivers, the practical trigger most facilities managers need to know is the <a href=\"https:\/\/www.hse.gov.uk\/pubns\/indg178.pdf\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">250 bar litres rule<\/a>: multiply the pressure (in bar) by the volume (in litres), and if the answer exceeds 250, PSSR generally applies.<\/p>\n<p>Systems that typically need a WSE include:<\/p>\n<ul>\n<li>Compressed air receivers at or above 250 bar litres<\/li>\n<li>Steam boilers and sterilising autoclaves in healthcare or education settings<\/li>\n<li>Fixed LPG storage vessels<\/li>\n<li>Vapour-compression refrigeration plant above 25 kW<\/li>\n<\/ul>\n<p>Small, low-pressure items, sealed factory-fitted systems below the threshold, and some single-use disposable equipment are commonly exempt. Do not assume exemption without checking the specific volume and pressure figures against HSE\u2019s own guidance, because getting this wrong is the single most common compliance gap Deltafirst encounters on site surveys.<\/p>\n<h2 id=\"who-counts-as-a-competent-person-and-what-must-they-actually-do\" tabindex=\"-1\">Who counts as a competent person, and what must they actually do?<\/h2>\n<p>The competent person is the technical authority behind your WSE, and PSSR does not treat this as a box-ticking title. ACOP L122 expects someone with genuine knowledge of pressure systems, relevant practical experience, and enough independence from operational pressures to make an honest judgement about risk. That last point matters: a competent person under pressure to keep a production line running is not acting independently.<\/p>\n<p>There is a meaningful distinction between drawing up a scheme and certifying one. Someone else can draft a WSE, but if that person is not themselves a competent person, the finished scheme must still be certified as suitable by one before it has any legal standing.<\/p>\n<p>In-house competence works if your engineering team genuinely meets the criteria, and it can be faster and cheaper for large estates. External competent persons bring independence and broader cross-industry experience, which matters for complex or ageing plant.<\/p>\n<p><strong>Pro Tip:<\/strong> <em>Before appointing anyone, ask for evidence of relevant qualifications, recent comparable experience, professional indemnity insurance, and written confirmation they are not simply rubber-stamping someone else\u2019s draft.<\/em><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.deltafirst.co.uk\/blog\/wp-content\/uploads\/2026\/09\/1788068480841_Who-counts-as-a-competent-person-and-what-must-they-actually-do-overview-diagram.jpeg\" alt=\"Who counts as a competent person, and what must they actually do? \u2014 overview diagram\"><\/p>\n<h2 id=\"what-must-a-written-scheme-of-examination-actually-contain\" tabindex=\"-1\">What must a written scheme of examination actually contain?<\/h2>\n<p>HSE\u2019s INDG178 guidance sets out the minimum information every WSE needs. Miss one of these and the scheme is not legally sufficient, however thorough it looks on paper.<\/p>\n<ol>\n<li><strong>Plant identification<\/strong> \u2014 enough detail to identify precisely which vessel, pipework or protective device the scheme covers.<\/li>\n<li><strong>Parts to be examined<\/strong> \u2014 pressure vessels, associated pipework where failure could cause danger, and every protective device.<\/li>\n<li><strong>Nature of the examination<\/strong> \u2014 whether it is visual, thickness testing, non-destructive testing, or a combination.<\/li>\n<li><strong>Preparatory work<\/strong> \u2014 isolation, cleaning, or dismantling needed before a safe examination can happen, beyond what the user would reasonably be expected to do themselves.<\/li>\n<li><strong>Maximum interval between examinations<\/strong> \u2014 set by the competent person, not by a generic industry default.<\/li>\n<li><strong>Competent person\u2019s name and certification date<\/strong> \u2014 the accountability trail.<\/li>\n<li><strong>Provision for re-examination<\/strong> after repair or modification, and where appropriate, examination before first use.<\/li>\n<\/ol>\n<p>In-service examinations happen while the plant is running (visual checks, pressure and temperature monitoring), while out-of-service examinations require shutdown, isolation, and often internal inspection. A steam boiler typically needs both across its lifecycle. Protective devices, particularly safety valves and pressure relief systems, must always feature in the scheme. Skip one, and you have left the exact component designed to prevent a catastrophic failure outside your safety net.<\/p>\n<h2 id=\"drawing-up-and-implementing-your-wse-a-practical-sequence\" tabindex=\"-1\">Drawing up and implementing your WSE: a practical sequence<\/h2>\n<p>Getting from \u201cwe need one of these\u201d to a working, certified scheme follows a logical order:<\/p>\n<ol>\n<li><strong>Define the scope<\/strong> \u2014 list every vessel, pipework run, and protective device that could fall under Regulation 8.<\/li>\n<li><strong>Take advice early<\/strong> \u2014 engage a competent person before drafting starts, not after.<\/li>\n<li><strong>Draft or commission the scheme<\/strong>, referencing manufacturer data and site-specific risk.<\/li>\n<li><strong>Certify<\/strong> \u2014 the competent person confirms the scheme is suitable.<\/li>\n<li><strong>Schedule<\/strong> examinations against the maximum intervals specified.<\/li>\n<li><strong>Carry out examinations<\/strong> on time, in-service or out-of-service as required.<\/li>\n<li><strong>Record<\/strong> every result, defect, and repair.<\/li>\n<\/ol>\n<p>Preparatory activities deserve early planning rather than last-minute scrambling. Isolation permits, confined space procedures, and liaison with the original equipment manufacturer all take lead time, and competent persons often factor this into how they set intervals, alongside corrosion risk and duty cycle data.<\/p>\n<p>Recordkeeping is not an afterthought. Examination reports need to feed directly into your planned preventative maintenance programme so that defects get actioned, not filed. Ongoing PPM around pressure equipment, such as <a href=\"https:\/\/deltafirst.co.uk\/blog\/commercial-boiler-maintenance\" target=\"_blank\" rel=\"noopener\">commercial boiler maintenance<\/a>, works far better when the WSE and the maintenance schedule are talking to each other.<\/p>\n<h2 id=\"keeping-the-scheme-suitable-as-the-system-ages\" tabindex=\"-1\">Keeping the scheme suitable as the system ages<\/h2>\n<p>A WSE is not a one-off document you file and forget. Review it at the intervals the competent person sets, and again whenever something changes: after a repair or modification, following a change in how the system is used, after any incident, or simply as plant ages and corrosion risk increases.<\/p>\n<p>The competent person should formally recommend any change to examination intervals, with the reasoning documented rather than assumed. ACOP L122 is explicit that owners retain ultimate responsibility for the scope of the scheme; a competent person advises, but the duty holder cannot simply defer all judgement to them.<\/p>\n<p>Practical records worth keeping include:<\/p>\n<ul>\n<li>A review log noting the date, trigger, and outcome of each review<\/li>\n<li>Certification dates for every examination cycle<\/li>\n<li>An action list tracking defects found and their close-out status<\/li>\n<\/ul>\n<h2 id=\"a-practical-checklist-for-procuring-your-written-scheme\" tabindex=\"-1\">A practical checklist for procuring your written scheme<\/h2>\n<p>When you approach a competent person or contractor, ask for a clear scope statement covering every vessel and pipework run in question, a written specification of deliverables (the scheme itself, terms of reference, and examination reports), and copies of all documentation before work starts. There is no single legally mandated template, and competent persons often structure schemes using frameworks such as SAFed\u2019s PSG 09 guidance, which sets out categorisation, plant schedules, and review structures in practical detail.<\/p>\n<p>Deltafirst supports facilities teams through this process with site surveys to establish scope, integration of examination schedules into existing PPM programmes, remedial works flagged by examination reports, and liaison with your appointed competent person to keep timelines realistic.<\/p>\n<p><strong>Pro Tip:<\/strong> <em>Ask any prospective competent person to show you a redacted example scheme before you commit. It reveals more about their thoroughness than any qualification certificate.<\/em><\/p>\n<p>If your pressure systems are overdue a review, request a planned maintenance survey and we will help you work out exactly where you stand.<\/p>\n<h2 id=\"where-to-find-the-definitive-detail\" tabindex=\"-1\">Where to find the definitive detail<\/h2>\n<p>For the statutory wording itself, go to Regulation 8 of PSSR 2000, which sets out the legal duty in full. HSE\u2019s INDG178 leaflet is the most accessible starting point for duty holders, covering minimum contents and worked examples in plain language.<\/p>\n<p>For depth on competent person duties and review obligations, ACOP L122 is the reference your competent person should already know closely. When you need practical template structure for the scheme itself, SAFed PSG 09 fills the gap that statute deliberately leaves open, since there is no single prescribed format.<\/p>\n<h2 id=\"why-compliance-first-beats-paperwork-first\" tabindex=\"-1\">Why compliance-first beats paperwork-first<\/h2>\n<p>Most guidance on this subject treats the written scheme of examination as a legal hurdle to clear, and that framing does readers a disservice. The scheme is the working document that tells an engineer what to look at, how, and by when. Treat it as an administrative artefact and you get a scheme that satisfies an inspector on paper but leaves gaps in what actually gets tested.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.deltafirst.co.uk\/blog\/wp-content\/uploads\/2026\/09\/1788068559347_Why-compliance-first-beats-paperwork-first-overview-diagram.jpeg\" alt=\"Why compliance-first beats paperwork-first \u2014 overview diagram\"><\/p>\n<p>The conventional advice, \u201cget a competent person, get a certificate,\u201d undersells the harder part: defining scope honestly. Duty holders regularly exclude pipework runs or ancillary vessels because nobody wants to pay for a wider examination, then struggle to justify that exclusion when questioned. Scope discipline, not certification, is where most schemes actually fail.<\/p>\n<p>If you take one thing from this article, prioritise the interval logic over the paperwork. A scheme with beautifully formatted documentation but intervals set by guesswork rather than corrosion risk and duty cycle data is a liability wearing a compliance certificate. Get the technical judgement right first; the record-keeping should follow from that, not substitute for it.<\/p>\n<blockquote>\n<p><em>\u2014 Ashley<\/em><\/p>\n<\/blockquote>\n<h2 id=\"get-your-pressure-systems-compliance-sorted-with-deltafirst\" tabindex=\"-1\">Get your pressure systems compliance sorted with Deltafirst<\/h2>\n<p>Deltafirst gives facilities managers across Essex, Suffolk, Cambridgeshire, and Norfolk and Greater London a single accountable partner for pressure system compliance, rather than juggling separate contractors for the survey, the remedial works, and the ongoing maintenance. We carry out site surveys to establish scope, fold your written scheme examination intervals directly into your <a href=\"https:\/\/deltafirst.co.uk\/commercial-electrical-maintenance-essex\/index.html\" target=\"_blank\" rel=\"noopener\">planned preventative maintenance<\/a> schedule, and handle remedial works flagged by your competent person without the delay of bringing in a third party mid-project.<\/p>\n<p>That matters most for education, healthcare, and industrial sites where boilers, autoclaves and compressed air systems sit alongside dozens of other statutory obligations, and where a missed interval means a shutdown, not just a paperwork breach. If your written scheme needs implementing, integrating into PPM, or simply reviewing against current site conditions, request a quotation or planned maintenance survey from Deltafirst, and we will tell you exactly where your current arrangements stand.<\/p>\n<h2 id=\"sources\" tabindex=\"-1\">Sources<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.legislation.gov.uk\/uksi\/2000\/128\/regulation\/8\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">The Pressure Systems Safety Regulations 2000 \u2014 Regulation 8<\/a><\/li>\n<li><a href=\"https:\/\/www.hse.gov.uk\/pubns\/indg178.pdf\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">Written schemes of examination (HSE INDG178)<\/a><\/li>\n<\/ul>\n<h2 id=\"recommended\" tabindex=\"-1\">Recommended<\/h2>\n<ul>\n<li><a href=\"https:\/\/deltafirst.co.uk\/blog\/integrated-facilities-management-uk-businesses\" target=\"_blank\" rel=\"noopener\">Integrated facilities management: a practical guide for UK businesses \u2013 Commercial Building Services Insights<\/a><\/li>\n<li><a href=\"https:\/\/deltafirst.co.uk\/blog\/mechanical-services-in-a-building-uk-compliance-guide\" target=\"_blank\" rel=\"noopener\">Mechanical services in a building: UK compliance guide<\/a><\/li>\n<li><a href=\"https:\/\/deltafirst.co.uk\/blog\/summer-hvac-maintenance\" target=\"_blank\" rel=\"noopener\">Summer HVAC maintenance: a guide for facilities managers<\/a><\/li>\n<li><a href=\"https:\/\/deltafirst.co.uk\/blog\/esos-uk\" target=\"_blank\" rel=\"noopener\">ESOS UK: the 2026 compliance guide for large organisations<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>UK pressure systems over 250 bar litres require a written scheme of examination. Checklist, competent person checks and HSE links.<\/p>\n","protected":false},"author":2,"featured_media":384,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-383","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"blocksy_meta":[],"uagb_featured_image_src":{"full":["https:\/\/www.deltafirst.co.uk\/blog\/wp-content\/uploads\/2026\/09\/1788068416226_Pressure-vessel-in-a-commercial-plantroom.jpeg",1080,720,false],"thumbnail":["https:\/\/www.deltafirst.co.uk\/blog\/wp-content\/uploads\/2026\/09\/1788068416226_Pressure-vessel-in-a-commercial-plantroom-150x150.jpeg",150,150,true],"medium":["https:\/\/www.deltafirst.co.uk\/blog\/wp-content\/uploads\/2026\/09\/1788068416226_Pressure-vessel-in-a-commercial-plantroom-300x200.jpeg",300,200,true],"medium_large":["https:\/\/www.deltafirst.co.uk\/blog\/wp-content\/uploads\/2026\/09\/1788068416226_Pressure-vessel-in-a-commercial-plantroom-768x512.jpeg",768,512,true],"large":["https:\/\/www.deltafirst.co.uk\/blog\/wp-content\/uploads\/2026\/09\/1788068416226_Pressure-vessel-in-a-commercial-plantroom-1024x683.jpeg",1024,683,true],"1536x1536":["https:\/\/www.deltafirst.co.uk\/blog\/wp-content\/uploads\/2026\/09\/1788068416226_Pressure-vessel-in-a-commercial-plantroom.jpeg",1080,720,false],"2048x2048":["https:\/\/www.deltafirst.co.uk\/blog\/wp-content\/uploads\/2026\/09\/1788068416226_Pressure-vessel-in-a-commercial-plantroom.jpeg",1080,720,false]},"uagb_author_info":{"display_name":"Delta First Editorial Team","author_link":"https:\/\/www.deltafirst.co.uk\/blog\/author\/deltaeditor\/"},"uagb_comment_info":0,"uagb_excerpt":"UK pressure systems over 250 bar litres require a written scheme of examination. Checklist, competent person checks and HSE links.","_links":{"self":[{"href":"https:\/\/www.deltafirst.co.uk\/blog\/wp-json\/wp\/v2\/posts\/383","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.deltafirst.co.uk\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.deltafirst.co.uk\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.deltafirst.co.uk\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.deltafirst.co.uk\/blog\/wp-json\/wp\/v2\/comments?post=383"}],"version-history":[{"count":1,"href":"https:\/\/www.deltafirst.co.uk\/blog\/wp-json\/wp\/v2\/posts\/383\/revisions"}],"predecessor-version":[{"id":387,"href":"https:\/\/www.deltafirst.co.uk\/blog\/wp-json\/wp\/v2\/posts\/383\/revisions\/387"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.deltafirst.co.uk\/blog\/wp-json\/wp\/v2\/media\/384"}],"wp:attachment":[{"href":"https:\/\/www.deltafirst.co.uk\/blog\/wp-json\/wp\/v2\/media?parent=383"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.deltafirst.co.uk\/blog\/wp-json\/wp\/v2\/categories?post=383"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.deltafirst.co.uk\/blog\/wp-json\/wp\/v2\/tags?post=383"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}