Pressure Equipment Workshop September 2007 – Day 1 Pressure Equipment Directive (PED) Classification Ed Haynes, Guy Baylac

Criteria for classification Two fluid groups - Group 1: Positive list of 7 dangerous fluid types as defined by Directive 67/548/EEC - Group 2: Other fluids Physical state of fluid - gaseous, - liquid Indication of stored “energy” PS·V or PS·DN (piping etc

Determination of applicable category Classification Group 1 fluid Group 2 fluid Vessels gaseous Table 1 Table 2 liquid Table 3 Table 4 Piping Table 6 Table 7 Table 8 Table 9 Pressure Accessories volume according to tables 1-4 DN according to tables 6-9 Safety general Category IV specific Category of respective equipment Assemblies According to highest element (except safety acc.)

Conformity assessment tables (A) Vessels for dangerous gases Vessels for non-dangerous liquids (Table 1) (Table 4)

Conformity assessment tables (B) Piping for dangerous gases Piping for non-dangerous liquids Table 6 Table 9

Examples for single items Use rules in PED Annex II tables or software available from some Notified Bodies Related Guidelines – series 2 on http://ec.europa.eu/entreprise/pressure_equipment/index Note – guidelines are indicative. They are not exhaustive and not legally binding. You must read all the text – the following examples are only extracts

Extracts of some Guidelines There is a contradiction between the requirements in article 3 paragraph 1.4 and those in annex II point 3. Can pressure accessories be classified as "article 3.3" as indicated in the tables in annex II or must all of them satisfy the essential requirements as indicated in article 3 paragraph 1.4? SHORT ANSWER – use Annex II Guideline 2/2: The Directive uses the notion of DN. 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, hollow sections....)? SHORT ANSWER internal cross-section

Extracts of some Guidelines How should vessels and piping for superheated water be classified? SHORT ANSWER see tables 2, 5 and/or 7 Guideline 2/4: (Controversial) Which type of pressure equipment is a heat exchanger ? Guideline 2/5: 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 ? SHORT ANSWER TS = 120 degrees C

Extracts of some Guidelines Guideline 2/6: How should a fired or otherwise heated equipment be classified if a fluid other than water is being heated ? SHORT ANSWER – NOT table 5 Guideline 2/7: Article 9 classifies fluids with reference to Article 2 (2) of Directive 67/548/EEC. Does this mean that all fluids classified as dangerous are group 1? A LONG ANSWER Guideline 2/8: How should a vessel which is intended to contain water below 100 °C be classified when there is a marginal gas cover ? SHORT ANSWER – table 4

Extracts of some Guidelines Guideline 2/9: 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, given that these are made up of two chambers with different fluids? SHORT ANSWER – Article 9.3 Guideline 2/10: If a vessel contains a fluid which meets the conditions of the introductory paragraph to Article 3, paragraph 1.1(a) (e.g. air) and a liquid which meets the conditions of the introductory paragraph to Article 3, paragraph 1.1(b) (e.g. water) - how shall the vessel be classified? SHORT ANSWER – Higher category - see also 2/8 and 2/9

Extracts of some Guidelines Guideline 2/11: When is it possible for a manufacturer to apply a module from a higher category and what are the consequences ? IMPORTANT PART OF ANSWER – The module used for conformity assessment does not change the classification of the equipment Guideline 2/15: Does the classification of the pressure cookers in category III for the assessment of the design mean that also the ESRs are linked to category III? SHORT ANSWER – NO

Assemblies Related Guidelines – series 3 on http://ec.europa.eu/enterprise/pressure_equipment/index Note – guidelines are indicative. They are not exhaustive and not legally binding. You must read all the text – the following examples are only extracts

Extract of some Guidelines Guideline 3/1: Must the global conformity assessment procedure be applied to assemblies covered by article 3.2.1, e.g. to boilers, even if the assembling is done under the responsibility of the user? SHORT ANSWER – NO Guideline 3/2: Are joining operations on site covered by the PED? ANSWER IN TWO PARTS Guideline 3/3: The effect of the derogation in Article 3.2.3 from the introductory paragraph in Article 3.2 is not clear. In the circumstances, how should Article 3.2.3 be applied ? ANSWER IS COMPLICATED

Extract of some Guidelines Guideline 3/4: What shall be the minimum extent of the assembly "boiler" which shall be subjected to a global conformity assessment procedure in accordance with article 3 section 2.1 ? SHORT ANSWER See EN 12952-1 Guideline 3/5: Shall the assemblies defined in the article 3 paragraph 2.3 carry the CE-marking? SHORT ANSWER – YES … but Guideline 3/6: Must a hydrostatic pressure test be carried out on an assembly and should the value laid down in section 7.4 then be followed ? COMPLEX ANSWER