PSSR — the Pressure Systems Safety Regulations 2000 — is one of UK industry's strictest statutory regimes, because when pressure equipment fails, it fails catastrophically. Steam boilers rupture. Air receivers explode. Autoclaves burst. The regulation applies to any relevant fluid above 0.5 bar, and duty holders — users and owners — carry personal liability. Every pressure system needs a Written Scheme of Examination and every examination must happen on schedule. Miss it and you're operating a system that is legally uninsurable. Book a PSSR compliance demo.
◆ PSSR 2000 · ACOP L122 · WRITTEN SCHEME MANAGEMENT
A pressure system without a current Written Scheme is a criminal offence in progress.
Every vessel. Every valve. Every examination cycle. Auditable, evidenced, defensible.
Above this pressure, PSSR applies
£unlimited
Fine on conviction · Reg 8 & 9 breach
2 years
Custodial exposure for duty holders
72 hrs
HSE notification window post-incident
What Actually Falls Under PSSR — The Scope Problem
The most common PSSR compliance failure is not scheduling — it's scoping. Duty holders miss systems that should be covered because "we didn't realise the coffee-shop espresso boiler counts", or over-cover systems where PSSR doesn't apply. The regulation defines a "pressure system" precisely: any system containing a relevant fluid at pressure above 0.5 bar. The categories below drive most UK enforcement action.
STEAM SYSTEMS
Boilers · Heat exchangers · Autoclaves · Distribution mains · Sterilisers
Any system generating or containing steam falls under PSSR regardless of pressure — steam is always a relevant fluid.
COMPRESSED AIR & GAS
Air receivers · Compressor systems · Nitrogen tanks · Argon lines · Process gas skids
In scope once pressure exceeds 0.5 bar above atmospheric AND stored energy exceeds 250 bar·litres (product of pressure and volume).
HAZARDOUS FLUIDS
LPG · Refrigerant · Chemical process systems · Toxic gas · Flammable liquefied gas
Relevant fluid definition includes any gas, liquefied gas, or fluid released as gas — most process fluids trigger PSSR.
SAFETY-CRITICAL PROTECTIVE DEVICES
Safety valves · Bursting discs · Interlocks · Pressure sensors · Emergency vents
Protective devices form part of the pressure system. Failure of a safety valve to lift is a Regulation 9 examination failure.
The Written Scheme of Examination — Where PSSR Really Lives
The Written Scheme of Examination (WSE) is the beating heart of PSSR compliance. Not the examination itself — the scheme. A competent person must draw up (or certify) the WSE, and it must specify exactly what will be examined, how, and when. HSE inspectors ask for the WSE first. If the WSE is missing, out of date, or generic (rather than system-specific), everything downstream is legally unsound. The anatomy below is what a defensible WSE actually looks like.
WSE ANATOMY
Regulation 8 · Written Scheme Structure
01
System Identification & Boundary
Every pressure system uniquely identified. Battery limits explicitly drawn. Isolation points that separate the system from adjacent systems documented.
Boundary drawing + asset ID per vessel
02
Parts to be Examined
Named parts — vessels, pipework runs, safety devices, valves, connections. Generic "the whole system" is not compliant. Each part gets an examination specification.
Itemised component register
03
Nature of Examination
Visual, internal, external, NDT, thickness measurement, hydrostatic test, functional test of safety devices. Per part, per interval — no ambiguity.
Examination method per component
04
Maximum Examination Interval
The date by which each examination must be completed. Set by the competent person based on system risk, duty, degradation history, not by convenience. Extension after this date is a criminal offence.
Statutory deadline per examination
05
Precautions Before Examination
Depressurisation, cooling, isolation, LOTO, permit-to-work interface, confined-space controls. Documented so examiner and operator agree the safe state before work begins.
Prep protocol + isolation checklist
06
Competent Person Certification
The WSE itself is signed and dated by the competent person who drew it up or reviewed it. Review dates specified. Changes to the system trigger WSE revision.
CP name · qualification · signature · date
The Examination Cycle — Where Defects Become Defensive Records
Once the WSE is live, the examination cycle runs continuously. Every examination produces a competent person report. Every report classifies defects. Every defect classification triggers a specific timeframe for corrective action. This is where PSSR compliance either becomes structural discipline or collapses into paperwork the inspector will pull apart on the day. Sign up free to run the full PSSR examination cycle in one platform.
DEFECT CLASSIFICATION
Competent Person Report · Corrective Action Windows
A
IMMEDIATE DANGER
Defect creates imminent risk. System taken out of service before further use.
ACTION · Immediate isolation + HSE notification if RIDDOR reportable
B
DANGER WITHIN SPECIFIED PERIOD
Defect will make the system dangerous if not repaired within the timeframe specified by the competent person.
ACTION · Repair before CP-specified date · Written notification to enforcing authority
C
REPAIRS REQUIRED
Repairs, modifications or changes to operational conditions needed to keep the system compliant at next examination.
ACTION · Planned before next scheduled examination · Evidence closed on system record
D
OBSERVATIONS
Items for monitoring. Not defects, but noted for context, degradation trending, or future WSE review.
ACTION · Tracked between examinations · Feeds next CP review
◆ PSSR COMPLIANCE DEMO
See the Full PSSR Cycle in 30 Minutes
Per-vessel asset registers linked to WSE, competent person appointments, examination scheduling with statutory deadlines, defect classification and remedial action tracking, Regulation 8 record retention and evidence packs ready for HSE.
Why Excel Kills PSSR Compliance — The Structural Case
Ask any UK duty holder how they track PSSR and the honest answer is usually the same: a spreadsheet, plus paper reports in a filing cabinet, plus emails between the site engineer and the third-party competent person. That system works right up until the moment it doesn't — the WSE lapses because the review date wasn't flagged, a Category B defect from last year's report never turned into a work order, the competent person's qualification expired without anyone checking, or the HSE inspector arrives and the historical examination records for a specific vessel can't be located. Every one of those failures is what PSSR enforcement action is built from.
Spreadsheet + Paper
- WSE review dates missed because nobody owns the reminder
- Defects on paper reports never become tracked actions
- CP qualification lapses invisible until the day of examination
- Historical records scattered — inspector waits while site searches
- Examination overdue detection is manual and reactive
Oxmaint PSSR Workflow
- WSE bound to system record with automated review reminders
- Every CP report defect auto-creates a tracked work order
- CP qualifications flagged before expiry with renewal workflow
- Complete examination history retrievable per vessel in seconds
- Overdue detection structural — dashboard visibility from day one
The value isn't in the software knowing PSSR — the value is that examination deadlines, defect actions and evidence retention become structural properties of the system rather than tasks somebody has to remember. Book a walkthrough to see PSSR workflow in a live deployment.
Expert Perspective — Where PSSR Enforcement Actually Comes From
"
The PSSR failures HSE writes up are rarely dramatic — they're structural. A steam boiler where the last thorough examination is 18 months old because the review reminder was in a spreadsheet nobody opened. A compressed-air system where a Category B defect from the previous CP report was never closed and the same defect appears on the current report. A pressure vessel added to the site three years ago that never got added to any WSE. A written scheme signed by a competent person whose qualification expired 14 months earlier. What links all of those is not competence and not intent — it's that the site is running PSSR through paper and spreadsheets in an era where the regulatory expectation is retrievable, evidenced, continuous compliance. Duty holders now facing prosecution almost always had the technical work done. They just couldn't prove it on the day the inspector asked.
— Pressure Systems Competent Person Practice
01
Per-vessel asset register
Every pressure vessel, receiver and safety device individually registered with WSE and examination history attached.
02
WSE review automation
Review dates set at scheme creation. Reminders escalate before expiry. Overdue schemes structurally visible.
03
CP report ingestion
Every report attaches to vessel record. Defects auto-classified. Category A/B/C actions become tracked work.
04
Evidence pack export
Full PSSR audit trail per system exportable to inspector on demand. No filing cabinet search.
Who Uses Oxmaint for PSSR in the UK
The platform is used by the UK roles that carry pressure-system duty on the ground: engineering managers running compressed-air and steam infrastructure across manufacturing sites, plant managers responsible for the pressure-vessel asset register, HSE and SHEQ managers coordinating statutory examinations with third-party competent persons, maintenance managers translating CP reports into scheduled work orders, insurance-appointed CPs uploading examination reports directly to the client's system, brewery and food-processing engineers running steam-boiler installations, and QSHE directors responsible for demonstrating continuous PSSR compliance to insurers and HSE inspectors. Sign up free to configure PSSR compliance for your site.
Getting PSSR Compliance Live in 30-45 Days
Deployment starts by importing the pressure-system asset register — every vessel, receiver, boiler and safety device with design pressures, capacities and manufacturer data where available. Existing WSEs are attached to systems, and any missing or expired schemes are flagged for CP action. Examination intervals configure per system with statutory deadlines and pre-examination reminder windows. Third-party competent person records tie to appointments and reports. CP report ingestion captures defects, and every finding becomes a tracked work item with owner, classification and closure evidence. Regulation 8 record retention builds automatically from workflow. Most manufacturing and industrial sites see pressure-system register, WSE tracking and CP report workflow live within 30-45 days. Sign up free to start structuring your PSSR programme.
◆ TURN PSSR DUTY INTO STRUCTURAL COMPLIANCE
One Platform. Every Vessel. Every Cycle.
Oxmaint gives UK duty holders the full PSSR cycle in one system — per-vessel registers linked to WSE, CP appointment tracking, examination scheduling with statutory deadlines, defect classification workflow and audit-ready evidence packs for HSE and insurers.
Frequently Asked Questions
What is PSSR and who has to comply?
The Pressure Systems Safety Regulations 2000 (PSSR) is the UK statutory regime governing pressure systems containing a "relevant fluid" — steam at any pressure, or any gas, liquefied gas or fluid released as gas above 0.5 bar gauge. Duty holders are users (of installed systems) and owners (of mobile systems). Compliance requires establishing safe operating limits, drawing up a Written Scheme of Examination by a competent person, arranging examinations in accordance with the scheme, and ensuring defects are addressed within timescales. HSE ACOP L122 is the approved code of practice. Breach carries unlimited fines and up to two years custodial exposure for individuals.
What is a Written Scheme of Examination?
The Written Scheme of Examination (WSE) is the statutory document required under Regulation 8 that specifies exactly which parts of a pressure system will be examined, the nature of each examination (visual, internal, NDT, thickness measurement, pressure testing, functional testing of safety devices), the maximum interval between examinations, and the precautions to be taken before examination. It must be drawn up or certified by a competent person and reviewed periodically. Generic "the whole system will be examined" schemes are not compliant — WSE must be system-specific and part-specific. HSE inspectors ask for the WSE first when checking PSSR compliance.
Who is a "competent person" under PSSR?
PSSR distinguishes between the competent person who draws up or certifies the WSE, and the competent person who carries out examinations. Both roles require sufficient training, experience, knowledge, resources and independence to perform the function reliably. In practice the CP is usually an inspection engineer from an insurance-appointed body (SAFed member firms, ABS, Lloyd's, Bureau Veritas, Zurich Engineering, HSB) or a similarly qualified in-house or consultant engineer for lower-hazard systems. Duty holders should verify CP qualifications and record verification. Oxmaint tracks competent person appointments and flags qualification expiry before it lapses.
What happens when a CP report identifies a defect?
Category A (immediate danger) defects require the system to be taken out of use immediately. Category B (danger within specified period) defects must be corrected before the CP-specified date; the CP must also give written notification to the enforcing authority. Category C (repairs required to remain compliant) defects must be actioned before the next scheduled examination. Category D observations are tracked but not actionable defects. Regulation 10 makes it an offence to operate a pressure system with an unclosed Category A or B defect. Oxmaint auto-creates tracked work orders for every classified defect with owner, deadline and closure evidence field.
What records must be retained and for how long?
Regulation 14 requires the WSE and CP reports of examination to be kept available for inspection by the enforcing authority. Reports must be kept until the next examination is carried out; the previous report should be retained where it is materially relevant to the current examination. Best practice — and typical insurer requirement — is to retain the full lifecycle record for as long as the pressure system remains in service, plus a period after decommissioning. Oxmaint retains complete examination history per vessel indefinitely, exportable as an evidence pack for inspectors or insurers on demand, so record retention becomes a structural property rather than a filing exercise.
