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Gasket selection for industrial piping EN 13480-3
  • PREMIUM
MAWP calculation procedure for pressure vessels
  • PREMIUM
ASME BPVC Sect. VIII Div. 1 – minimum, calculated and maximum test pressure
Leakage rate conversion
Pressure conversion calculator
PN-Flange rating calculator for C-steels
Preheat Temperature Calculation
  • PREMIUM
What is the ASME definition of MAWP?
  • PREMIUM

PED Guideline: (B) Classification & Category

The PED Guidelines are not a legally binding interpretation of the PED. The legally binding text remains that of the Directive. However, the PED Guidelines represent a reference for ensuring consistent application of the PED.

PED Guideline B-01

Question:

  • There is a contradiction between the requirements in article 4 paragraph 1 (d) and those in Annex II point 3. Can pressure accessories be classified as “Article 4 par. 3” as indicated in the tables in annex II or must all of them satisfy the essential requirements as indicated in article 4 paragraph 1 (d)?
  • Answer

PED Guideline B-02

Question:

  • The Directive uses the notion of DN (defined in Article 2 (11) for the classification of piping or piping accessories (cf. Article 3 paragraph 1(c)). How to apply the Directive for classifying the tubular products or accessories for which the notion of DN does not exist (copper tubes, plastic valves, pressure regulators, hollow sections…)?
  • Answer

PED Guideline B-03

Question:

  • How should vessels and piping for superheated water be classified?
  • Answer

PED Guideline B-04

Question:

  • Which type of pressure equipment is a heat exchanger?
  • Answer

PED Guideline B-05

Question:

  • Some warm water generators having a volume greater than 2 L are intended to generate water at a temperature less than 110 °C, but are fitted with a safety temperature limiter which is set to a temperature of 120 °C. What value of maximum allowable temperature, TS, shall be declared by the manufacturer?
  • Answer

PED Guideline B-06

Question:

  • How should fired or otherwise heated equipment be classified if a fluid other than water is being heated?
  • Answer

PED Guideline B-08

Question:

  • How should a vessel which is intended to contain water below 100 °C be classified when there is a marginal gas cover?
  • Answer

PED Guideline B-09

Question:

  • Which pressure and volume values must be used to determine the category of vessels used as gas-loaded accumulators, or other vessels with a flexible or non fixed membrane
  • Answer

PED Guideline B-10

Question:

  • If a vessel contains a fluid which meets the conditions of the introductory paragraph to Article 4, paragraph 1(a)(i) (e.g. air) and a liquid which meets the conditions of the introductory paragraph to Article 4, paragraph 1(a)(ii) (e.g. water) - how shall the vessel be classified?
  • Answer
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