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The Pressure Equipment Directive (2014/68/EU)

PED does not ask how good your vessel is. It asks how much damage it could do — and that answer, not your engineering, decides how much third-party involvement you are buying.

The category your equipment lands in is a calculation, not a judgement call. Pressure, volume or nominal size, the fluid, and whether that fluid is dangerous. Run the calculation and the category is determined; the category then determines your route, and your route determines your cost and your schedule.

Which means the first hour of a PED project is worth more than the next fifty. Get the classification wrong and everything downstream is wrong with it.

Two fluid groups, and the one that surprises people

PED divides fluids in two:

  • Group 1 — dangerous fluids. The definition points to the EU’s classification regulation and covers explosives, flammable gases and liquids, oxidising substances, self-reactive substances, organic peroxides, pyrophorics, and several acute toxicity classes. It also captures any fluid held above its own flashpoint, whatever it is otherwise classified as.
  • Group 2 — everything else.

That last clause in Group 1 is the one that moves projects. A fluid that is unremarkable at ambient temperature becomes a Group 1 fluid the moment your maximum allowable temperature exceeds its flashpoint — and Group 1 pushes you up the category table, sometimes past the point where you could have self-assessed.

If your equipment runs hot, check the flashpoint before you check anything else.

Category decides everything

Equipment is classified into categories I to IV in ascending order of hazard. The route follows automatically:

  • Category I

    Available routes Module A Notified Body? No — internal production control

  • Category II

    Available routes Module A2, D1 or E1 Notified Body? Yes, in every available route

  • Category III

    Available routes B + D, B + F, B + E, B + C2, or H Notified Body? Yes

  • Category IV

    Available routes B + D, B + F, G, or H1 Notified Body? Yes

Category I is the only one you can self-assess. From Category II upward, every route on the menu involves a Notified Body — there is no harmonised-standards escape of the kind the Machinery Directive offers. This is the single biggest structural difference between PED and machinery, and it is why the classification calculation matters so much: the boundary between Category I and Category II is the boundary between a self-declared product and a certified one.

You may always choose a procedure from a higher category if you prefer — for instance, running a full quality assurance system across a mixed product range instead of per-item assessment. That is a commercial decision, and for manufacturers with volume it is often the cheaper one.

For quality-assurance routes in Categories III and IV, the Notified Body makes unexpected visits and takes samples from production or storage to carry out the final assessment. You are required to tell them your production schedule. Plan for it: it is not a paperwork audit, it is someone arriving.

The mistake that costs the most: marking equipment that must not be marked

Equipment at or below the PED thresholds does not get a lighter version of the directive. It leaves the conformity assessment system entirely:

  • it must be designed and manufactured according to the sound engineering practice of a Member State, to ensure safe use;
  • it must come with adequate instructions for use;
  • and it must not bear the CE marking in respect of PED.

Read that last line twice.

Fact — check it yourself

Affixing CE marking to sub-threshold pressure equipment is not caution and not a courtesy to the customer — it is a non-conformity, because the mark asserts a conformity assessment that never happened and was never required.

Directive 2014/68/EU, art. 4(3)

We see this constantly with U.S. manufacturers, and the reasoning is always the same and always reasonable: the machine has a CE mark, the vessel is part of the machine, so it should have one too. But the machine’s mark comes from the Machinery Directive. The vessel below threshold has no PED mark to give. If other legislation independently requires CE marking, that is a different question with a different answer — which is exactly why it needs checking rather than assuming.

What we do

  • Equipment classification and category assessment — the calculation, done first and documented.
  • Conformity assessment procedures (modules) — choosing the route, including whether a higher category’s route is commercially better for you.
  • Technical documentation and design verification.
  • Notified Body interface, including preparing for unexpected visits under the quality-assurance routes.
  • Support for CE marking of pressure equipment — and, where it applies, confirming that a piece of equipment must not be marked.