PED Pressure Equipment Compliance Checklist (Downloadable)

Direct answer: PED compliance readiness comes down to seven checks done in order: confirm the equipment falls under the Pressure Equipment Directive (PS above 0.5 bar), identify the fluid group, calculate the category from PS and volume or DN, match that category to its required conformity assessment module, verify the Essential Safety Requirements in Annex I are documented and tested, engage a Notified Body where the category demands it, and finish with a complete, traceable CE marking and Declaration of Conformity file. Missing or misfiling any one of these is the most common reason a technical file fails an audit or a customer review.

The Pressure Equipment Directive (2014/68/EU, "PED") governs the design, manufacture and conformity assessment of pressure equipment and assemblies placed on the EU market. For manufacturers, PED compliance is rarely a single decision — it is a chain of classification steps that each feed the next, and a paperwork trail that has to survive scrutiny years after the equipment shipped. This checklist walks through that chain in the order assessors actually work through it, so a quality or engineering team can use it as a working readiness review rather than a restatement of the regulation's text.

1. Confirm scope applicability (PS > 0.5 bar)

The first gate is simple but easy to skip: PED applies to pressure equipment and assemblies with a maximum allowable pressure (PS) greater than 0.5 bar gauge. Equipment operating at or below that threshold falls outside PED's scope, though it may still be subject to other directives (Machinery, ATEX, Low Voltage) depending on its function. Before doing any category work, confirm PS for every vessel, piping run, safety accessory and pressure accessory in the assembly, and record the basis for that PS figure — design data sheet, test certificate or engineering calculation — in the technical file. An assembly can also trigger PED even if each individual component is exempt, so assess the assembly as a whole, not only its parts.

2. Determine fluid group (1 or 2)

PED splits contained fluids into two groups, and the group materially changes the category thresholds that apply later. Fluid Group 1 covers substances classified as dangerous — explosive, flammable, toxic, oxidising or similarly hazardous per the applicable classification rules. Fluid Group 2 covers everything else, including steam, compressed air and other fluids not meeting the Group 1 hazard criteria. Get this classification confirmed and documented early, ideally by whoever owns the safety data sheet or process specification for the fluid in question, because a Group 1 fluid pushes many designs into a higher category — and a higher module — than the same PS and volume would under Group 2.

3. Determine category (I–IV) via the PS×V or PS×DN lookup

With PS confirmed and fluid group settled, the equipment is classified into one of four categories (I, II, III or IV) using the diagrams in Annex II of the Directive. Vessels are plotted against PS and volume (V); piping is plotted against PS and nominal diameter (DN); the applicable diagram depends on fluid group and equipment type (vessel, piping, steam generator, or safety accessory). Category I carries the lightest assessment burden and Category IV the heaviest, with Notified Body involvement becoming mandatory from Category II or III upward depending on the module route chosen. Because this step drives everything downstream, the checklist should require that the category determination cites the specific Annex II diagram used, the input values (PS, V or DN, fluid group), and who signed off on it — not just a category number sitting unexplained in a spreadsheet.

4. Confirm which conformity assessment module route applies

Each category maps to a defined set of permissible conformity assessment modules (e.g. internal production control, EU-type examination, quality assurance modules, unit verification), and manufacturers typically have a choice among the modules allowed for their category. This choice affects cost, lead time and the degree of Notified Body oversight, so it should be a deliberate decision recorded in the technical file — not a default inherited from a previous product line. Verify that the module actually selected matches one that is legally available for the confirmed category, and that the manufacturer's quality system (where a quality-assurance-based module is used) is certified to the scope the module requires.

5. Confirm Essential Safety Requirements (Annex I) are met — design and testing records

Annex I sets out the Essential Safety Requirements (ESRs) covering design, manufacture, materials, testing and marking. Meeting them is not a one-line declaration — it needs traceable evidence: design calculations, material certificates, welding procedure qualifications, non-destructive testing records, pressure test results and, where applicable, final inspection reports. The practical failure point here is not that the engineering is wrong, but that the evidence is scattered across shared drives, email threads and supplier PDFs with no single index tying each ESR clause to the document that proves it was satisfied. A clean technical file should let an auditor move from any Annex I clause straight to its supporting evidence without a manual search.

6. Confirm Notified Body engagement where the category requires it

Where the category and chosen module require third-party involvement, confirm the Notified Body is engaged, its identification number is on file, and its certificate or assessment report is current and covers the specific equipment, category and module in question — not an adjacent product or an expired scope. Track renewal dates and re-assessment triggers (design changes, new manufacturing sites, material substitutions) so Notified Body coverage does not quietly lapse between audits.

7. Confirm CE marking and Declaration of Conformity documentation is complete and traceable

The final check closes the loop: the CE mark is applied correctly (with the Notified Body number appended where required), and the EU Declaration of Conformity references the correct directive, category, module, applied standards and Notified Body details, signed by an authorised person. The Declaration and its supporting technical file must be retrievable together, and kept for the retention period the Directive requires. A Declaration that cites the wrong module, an outdated standard, or a category that no longer matches an updated design is a common finding in customer and regulator audits — and it is entirely preventable with a documented cross-check at sign-off.

Practical impact

Getting these seven checks right, in order, shortens audit preparation, reduces rework when a Notified Body raises a query, and gives sales and procurement teams a clean answer when a customer asks for proof of compliance before signing a contract. Getting them wrong — or getting the order wrong, such as selecting a module before the category is confirmed — tends to surface late, usually during a customer audit or a Notified Body review, when correcting it is far more expensive than it would have been at the design stage.

Common mistakes

• Classifying category from memory or a rule of thumb instead of running the actual PS×V or PS×DN figures against the Annex II diagrams.
• Treating fluid group as fixed for a product line, when a formulation or process fluid change can move a design from Group 2 to Group 1.
• Selecting a conformity module before the category is finalised, then discovering the module is not available for the confirmed category.
• Holding Annex I evidence in scattered files with no index linking each clause to its supporting test record or certificate.
• Letting a Notified Body certificate lapse or fall out of scope after a design change, material substitution, or new manufacturing site.
• Issuing a Declaration of Conformity that references an outdated harmonised standard or a category that no longer matches the as-built design.

Frequently asked questions