Eu Pressure Equipment Directive Testing Services
EU Pressure Equipment Directive (PED) testing services are best commissioned as an evidence programme, not as an isolated pressure test. The test plan must match the equipment, its essential safety requirements and the applicable conformity-assessment module.
Directive 2014/68/EU concerns pressure equipment and assemblies with maximum allowable pressure PS above 0.5 bar, subject to the Directive's exclusions. A test report alone does not establish that the product can bear the CE marking.
Define the testing boundary before commissioning a laboratory
Before requesting a quotation, the manufacturer should record three separate decisions. Classification determines the assessment route; the assessment route determines who must verify or witness particular work; the technical design determines the tests and acceptance criteria.
- Identify the equipment or assembly, intended fluid and fluid group, PS, temperature limits, vessel volume V or piping DN, and the relevant PED Article 4 / Annex II classification. Do not infer a category from pressure alone.
- Identify the chosen Annex III assessment module and whether notified-body involvement or a recognised third-party approval is required for the specific activity. Not all PED equipment requires notified-body certification.
- List applicable Annex I hazards, manufacturing standards and the exact edition of each test standard; check the current EU Official Journal references before relying on a harmonised-standard presumption of conformity.
PED testing and evidence matrix
Use the matrix to agree the evidence package, not as a universal catalogue of tests mandatory for every product.
| Evidence stream | Input and test question | Acceptance / release decision |
|---|---|---|
| Scope and route | Equipment identity; PS, V/DN, fluid group and classification; chosen module. | Confirm who assesses each step before samples are shipped. Classification is not itself a laboratory test. |
| Pressure containment | Design calculations, test medium, test pressure, temperature, hold period, calibrated instruments and a safe fixture. | Annex I 3.2.2 normally envisages hydrostatic proof testing; for vessels check 7.4 where applicable. Record deviations and approved alternatives. |
| Welds and NDT | Weld map, joining procedure/personnel records, NDT method, extent and defect acceptance criteria. | Annex I 3.1.2 sets third-party approvals for joining in categories II–IV; 3.1.3 sets recognised-third-party personnel approval for NDT of permanent joints in III–IV. |
| Materials and fabrication | Material certificates, heat identifiers, traceability and any necessary material/mechanical or heat-treatment tests. | Match reports to actual pressure-bearing parts and retain evidence from receipt through final test (Annex I 3.1.5). |
| Assembly safety devices | Assembly boundary, protection concept, set pressures, functional checks and final inspection record. | For assemblies, verify the safety devices in final assessment where Annex I 3.2.3 applies; pressure integrity alone is insufficient. |
A proposed pneumatic or other non-hydrostatic test needs a documented technical justification: under Annex I 3.2.2, where hydrostatic testing is harmful or impracticable, an alternative of recognised value may be used with additional measures beforehand. Never substitute a cheaper method without evaluating the safety consequences.
Samples, witnessing and traceability
Agree a sampling and witness plan before fabrication closes access. Test evidence must refer to the design and production state actually offered for assessment.
- Maintain a sample-to-report chain: drawing revision → material heat → weld/lot identification → serial or batch number → test setup and result.
- Define which units are tested, whether destructive specimens are separate from saleable units, and who observes critical stages. Do not extrapolate one prototype result to unrelated variants.
- Plan hold points for internal inspection, NDT and final pressure tests. Category I series-produced pressure equipment may use statistical proof testing under Annex I 3.2.2; this is not a general permission for sample-only testing in other categories.
Select the right laboratory and independent body
Separate the roles of a testing laboratory, a PED notified body and a Member State-recognised third-party organisation. Laboratory accreditation may support technical competence but does not, by itself, confer a PED notification or approval scope.
- Ask for the named legal entity, site, test methods, measurement range, accreditation schedule if claimed and restrictions on subcontracting.
- For regulated third-party tasks, verify the actual body and its notified or recognised activities in the Commission's NANDO listing; check module, equipment and activity scope, not just a logo.
- Agree whether the lab will issue raw data, signed reports, uncertainty/calibration details, photographs, failure findings and revision-controlled appendices.
- Agree who owns the assessment decision and witness points. A laboratory report and a notified body's conformity decision are different deliverables.
Decide whether a test report is acceptable or reusable
Acceptance is a documented match between the report, applicable requirement, tested article and receiving assessment route. Reuse is a fresh applicability decision—not automatic transfer of approval.
- Require identifiable manufacturer/equipment, serial or batch, drawing revision, method/edition, test conditions, acceptance limits, measured results and an authorised report issuer.
- Check calibration validity, personnel qualifications and any required external approvals; preserve the actual evidence, not only a one-page pass statement.
- Map each report to the Annex I requirement and the chosen standard or justified alternative. If a harmonised standard is cited, verify the relevant current Official Journal reference and its limitations.
- For report reuse, compare design, material, weld procedure, production site, pressure/temperature limits and test method. Resolve discrepancies with the assessment body where one is involved.
Failure and engineering-change decision map
Record the following triggers in a controlled test file. The correct response depends on technical effect and the assessment route; a changed product does not always need the same entire test programme repeated.
| Trigger | Evidence at risk | Safe next action |
|---|---|---|
| Leak, deformation or failed NDT | Containment, joint acceptance and the reliability of the sample. | Quarantine affected units; analyse root cause; document repair, revised inspection and relevant retests before release. |
| Material, weld method or supplier change | Traceability, joining approvals and representativeness. | Review compatibility and qualification scope; update drawings/records and test the affected characteristics. |
| Changed PS, temperature, geometry or safety device | Design calculation, test pressure, safety function and category. | Reassess scope/category and test/assessment plan; obtain required third-party agreement before relying on old evidence. |
| Existing report offered for a new variant or plant | Identity, manufacturing controls and technical equivalence. | Build a comparison matrix, identify gaps, and obtain a documented acceptance or new tests as necessary. |
Information to send before booking a test
A useful request for quotation is a small technical dossier, not only a product photo. Supply:
- Product and assembly drawing set with controlled revisions, intended duty, PS, temperature range, V/DN and fluid group.
- Preliminary PED applicability/category and chosen module, or a clearly flagged open classification question.
- Material schedule, welding map/qualifications, NDT plan, quality records and existing reports with serial/lot linkage.
- Proposed test method, acceptance standard/edition, equipment quantity, specimen plan, dates for access and witness points.
- Expected outputs: signed report, test data and deviations, evidence index, failed-test response and explicit third-party interfaces.
For broader classification and route planning, see PED consultancy; for the complete conformity and CE-marking workflow, see PED CE-marking services. This page deals specifically with test selection and defensible evidence.
Frequently asked questions
Is a hydrostatic test always mandatory?
No. Annex I 3.2.2 normally uses hydrostatic proof testing; if it is harmful or impracticable, other tests of recognised value may be used with additional measures beforehand. The justification and acceptance criteria need documenting.
Can a laboratory issue a PED CE certificate?
A laboratory test report is not automatically a notified-body certificate or a complete conformity assessment. Check the selected module and the body's notified scope; some routes do not require a notified body.
Can one prototype report cover a whole production series?
Only where representativeness, manufacturing controls, the selected module and the applicable test provisions support that conclusion. The special statistical proof-test provision in Annex I 3.2.2 concerns category I series-produced equipment.
Do weld inspectors need third-party approval?
Annex I 3.1.3 requires suitably qualified NDT personnel and, for categories III and IV, approval by an organisation recognised under Article 20. Permanent-joining procedures and personnel in categories II–IV have separate approval rules in Annex I 3.1.2.
When must we retest after changing a design or supplier?
There is no universal retest count. Compare the change against previously demonstrated requirements, sample identity, material and joining qualifications, and module obligations. Document what must be repeated and obtain body agreement where required.