SIST-TP CEN/TR 14549:2004

SLOVENSKI STANDARD
01-maj-2004
Guide to the use of ISO 15649 and ANSI/ASME B31.3 for piping in Europe in
compliance with the Pressure Equipment Directive
Guide to the use of ISO 15649 and ANSI/ASME B31.3 for piping in Europe in compliance
with the Pressure Equipment Directive
Erdöl- und Erdgasindustrien - Alternative für metallische industrielle Rohrleitungen
Guide pour l'utilisation de l'ISO 15649 et l'ANSI/ASME B31.3 pour les tuyauteries en
Europe en respectant la Directive Equipements sous Pression
Ta slovenski standard je istoveten z: CEN/TR 14549:2004
ICS:
75.200 2SUHPD]DVNODGLãþHQMH Petroleum products and
QDIWHQDIWQLKSURL]YRGRYLQ natural gas handling
]HPHOMVNHJDSOLQD equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL REPORT
CEN/TR 14549
RAPPORT TECHNIQUE
TECHNISCHER BERICHT
March 2004
ICS 75.200
English version
Guide to the use of ISO 15649 and ANSI/ASME B31.3 for piping
in Europe in compliance with the Pressure Equipment Directive
Guide pour l'utilisation de l'ISO 15649 et l'ANSI/ASME Erdöl- und Erdgasindustrien - Alternative für metallische
B31.3 pour les tuyauteries en Europe en respectant la industrielle Rohrleitungen
Directive Equipements sous Pression
This Technical Report was approved by CEN on 21 December 2003. It has been drawn up by the Technical Committee CEN/TC 12.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TR 14549:2004: E
worldwide for CEN national Members.

Contents
Page
1 Scope .4
2 Normative References .5
3 Terms and definitions.6
4 General.6
4.1 Scope of the PED .6
4.2 Responsibilities.6
4.3 Fluid groups .6
4.4 Conformity assessment categories .7
4.5 Conformity assessment procedures .9
4.6 Hazard analysis.10
5 Materials.10
5.1 Material selection and appraisal.10
5.2 Material certification .11
6 Design and calculation.11
6.1 Allowable stresses.11
6.2 Joint coefficients.11
6.3 Isolation .11
7 Fabrication and installation .12
7.1 Permanent joining (e.g. Welding).12
7.2 Traceability .12
7.3 Documentation.12
7.3.1 Marking and labelling .12
7.3.2 Operating instructions .13
7.3.3 Marking at take-off points .13
7.3.4 Declaration of conformity .13
8 Inspection and testing.13
8.1 Non-destructive tests .13
8.2 Final inspection.13
9 Safety devices .14
Annex A (informative)  Checklist of major actions arising from the PED.15
Annex B (informative)  Key articles in the PED .16
B.1 Introduction .16
B.2 Table of Key Articles in the PED .16
Annex C (informative)  Clauses of this guide addressing essential requirements or other provisions of the
PED.21
Annex D (informative)  Comparison of ISO 15649, ANSI/ASME B31.3 and PED annex I (Essential Safety
Requirements).23
D.1 Introduction .23
D.2 Comparison tables.23
D.2.1 Contents of each table .23
D.2.2 How to use the tables .24
Annex E (informative)  Sources of further information and guidance.52
E.1 Established guidelines .52
E.1.1 General.52
E.1.2 European Commission (CEC) guidelines.52
E.1.3 Other guidelines.52
E.2 Other sources of information .52
E.2.1 Websites .52
E.2.2 Published Guidance guidance documents .53
E.2.3 Miscellaneous sources.53
E.3 Abbreviations .53
Foreword
This document CEN/TR 14549:2004 has been prepared by Technical Committee CEN/TC 12 “Materials,
equipment and offshore structures for petroleum and natural gas”, the secretariat of which is held by AFNOR.
Annexes A, B, C, D and E are informative.
th
The European Pressure Equipment Directive (PED), Directive 97/23/EC, entered into force on 29 November 1999
and has been mandatory throughout all Member States of the EU and the rest of the European Economic Area
th
(EEA) on 30 May 2002. The prime purpose of the PED is to eliminate barriers to trade without detriment to safety.
In May 1985, European Community Ministers agreed on a New Approach to Technical Harmonisation and
Standards in order to fulfil the objective of an open market in Europe with free movement of goods. New Approach
Directives such as the PED set out essential safety requirements which must be met.
This document has been developed in order to facilitate PED compliance with respect to the current industry
practice for piping that is based on ANSI/ASME B31.3.
This document is technically identical to the EEMUA publication 202 and its Amendment 1 published in May 2002.
This CEN Technical Report cannot provide a presumption of conformity with the PED, therefore the essential safety
requirements of the PED should be followed and seen to be followed in full.
1)
PED Issues and their solutions are continuing to develop, therefore users * of this CEN Technical Report are
advised to make use of the references provided in this guide, in order to keep up to date via information published
on the Internet World Wide Web.

1)
In the text that follows, the term "user" often refers to the end user of pressure equipment, rather than to the user of this
Guide. The precise meaning should be clear from the context in which the tern is used.
Introduction
This Guide explains how to use ISO 15649 and ANSI/ASME B31.3 while also complying with the European
Pressure Equipment Directive (PED), for piping in Europe Union and other EEA countries. This Guide is intended
to facilitate discussions between owner/purchaser, manufacturer/designer and notified body leading to conformity
with the PED in a consistent manner.
In general, the PED acts as a jurisdictional regulation with emphasis on general requirements, while for the details
of design and construction, reference needs to be made to appropriate engineering standards. ANSI/ASME B31.3
Code is a standard addressing design, fabrication, examination and testing of piping systems. Its use is subject to
contractual agreements between the owner and the manufacturer/ assembler of a piping system. The PED does
not prohibit the use of ANSI/ASME B31.3 (or indeed of any code), however the requirements specified in the PED
should be fulfilled.
Review of ANSI/ASME B31.3 against the Articles and the essential safety requirements (ESRs) of the PED has
shown that:
 some Articles and ESRs are satisfied by ANSI/ASME B31.3;
 some Articles and ESRs are not addressed by ANSI/ASME B31.3;
 some aspects of ANSI/ASME B31.3 differ from the Articles and ESRs.
The PED is transposed and translated by each Member State into its national legislation. Users are advised to
review the translation implemented in the relevant Member State in order to ensure full regulatory compliance. (The
relevant document in the UK is The Pressure Equipment Regulations 1999, SI 1999 No 2001.) National legislation
can also include requirements outside the scope of the PED, for example for in-service inspection.
The full text of the PED can be found at the European Commission's PED website. The European Commission also
publishes Guidelines approved by the Commission’s Working Group Pressure (WGP) that, while not legally
binding, are intended to provide more detail on how to apply the PED. References in the present document to
"Guideline x/x" pertain to the WGP Guidelines. See also annex E.
Europia has published a guide for the oil industry on the use of the PED with particular emphasis on refinery
operations, whilst EEMUA has published a guide for purchasers of valves under the PED (EEMUA Publication
196).
NOTE ON UNIT OF PRESSURE Throughout the text of this Guide, "bar" signifies gauge pressure (above atmospheric).
1 Scope
This Guide is intended for use in the petroleum, petrochemical and chemical industries. It identifies and defines a
set of common additional and modified requirements to ISO 15649 and ANSI/ASME B31.3 necessitated by the
PED. Additional guidance is provided by a suite of annexes (A to E) which are intended to be read independently,
but in the context of the main text. These include an actions checklist, tables identifying key requirements of the
PED and the corresponding clauses of the ISO/ANSI–ASME standards, and supplementary information.
ISO 15649 incorporates ANSI/ASME B31.3 by normative reference and also contains additional common
international practice. The relationships are illustrated in Figure 1.
Figure 1 - Sketch of relationship
NOTE The scope of the PED itself is defined therein, in particular in the Preamble and in Article 1.
2 Normative References
This Technical Report incorporates by dated or undated reference, provisions from other publications. These
references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated
references, subsequent amendments to or revisions of any of these publications apply to this Technical Report only
when incorporated in it by amendment or revision. For undated references the latest edition of the publication
referred to applies (including amendments).
EN 764-4, Pressure equipment – Part 4: Establishment of technical delivery conditions for metallic materials.
EN 10204, Metallic products - Types of inspection documents.
ISO 15649:2001, Petroleum and natural gas industries – Piping.
Directive 97/23/EC of the European Parliament and of the Council of 29 May 1997 on the approximation of the laws
of the Member States concerning pressure equipment (published in the Official Journal of the European
Communities No L 181, 9.7.97). (Note: the full text of the PED is online, see Ref. 4 below).
PED – Information Resource Centre – The European Commission DG-Enterprise website for the PED:
http://ped.eurodyn.com/.
Guidelines related to the application of the Pressure Equipment Directive 97/23/EC, web page:
http://ped.eurodyn.com/Guidelines/Guid-Intro.html.
European Pressure Equipment Directive – A guide for the oil industry [Europia]. http://europia.standardsline.net/
and connect to “Pressure Equipment Directive”.
ANSI/ASME B31.3:1999, Process Piping (including ANSI/ASME B31.3a – 2000 Addenda).
ASME QAI-1:1998, Qualifications for Authorized Inspection.
EEMUA Publication 196, Valves Purchasers' Guide to the PED.
3 Terms and definitions
For the purposes of this Technical Report, the terms and definitions given in ISO 15649:2001, ANSI/ASME
B31.3:1999 and the PED apply. Piping is defined in Article 1, sub-clause 2.1.2 of the PED applied.
4 General
4.1 Scope of the PED
The PED applies to the design, manufacture and conformity assessment of pressure equipment and assemblies
with a maximum allowable pressure greater than 0,5 bar. "Pressure equipment" means vessels, piping, safety
accessories (devices to prevent overpressure, e.g. safety valves) and pressure accessories (operational devices
with pressure-bearing housings, e.g. valves). "Assemblies" means several pieces of pressure equipment
assembled to constitute an integrated and functional whole (see Guidelines 3/8 and 3/9). This scope differs from
the scope of ANSI/ASME B31.3, for example piping systems for less than 1 bar pressure and for non-flammable,
non-toxic etc. service are excluded from ANSI/ASME B31.3.
The PED applies to new equipment. For further details see the PED Preamble and Article 1. Repairs to piping are
not covered by the PED, but may be covered by national regulations (Guideline 1/3). A modification where the
content, main purpose and safety systems remain essentially the same, may be regarded as non-important and
outside the scope of the PED (Guideline 1/4).
For further guidance on assemblies, see also other Guidelines prefaced "3/"
4.2 Responsibilities
ISO 15649 and ANSI/ASME B31.3 specify responsibilities for owner, designer, manufacturer and
fabricator/assembler. ANSI/ASME B31.3 does not address the issue of third party involvement, this would be a
requirement of jurisdictional regulations.
However, under the PED the "manufacturer" is responsible for design including certain design conditions, for
manufacture and for conformance with the PED. The manufacturer's responsibilities as defined in the PED could
fall to a designer, an importer, an owner, or an engineering contractor. The assigning of the manufacturer's
responsibilities would be agreed by the parties to a contract, and may need to be defined for each component and
assembly. (For further information on the responsibilities of the manufacturer, the reader is referred to the
European Commission's Guide to the Implementation of Directives based on the New Approach and the Global
Approach.)
4.3 Fluid groups
The manufacturer is responsible for classifying the fluid as Group 1 or 2, as required by PED Article 9, in
accordance with Table 1 below.
Table 1 – Fluid groups
Fluid group (Gas or Liquid) Fluids defined as
Group 1
–explosive
– extremely flammable
– highly flammable
– flammable (where the maximum allowable
temperature is above the flash point)
–very toxic
–toxic
– oxidizing
Group 2 All other fluids not in Group 1
Two-phase fluids should be treated as gases.
The fluid service categories (normal fluid service, category D, category M) as defined in annex M of ANSI/ASME
B31.3:1999 are not directly related to the fluid groups in PED. Note that Category M applies to toxic fluids,
Category D to non-toxic, non-flammable, non-dangerous, low-pressure and moderate temperature fluids.
4.4 Conformity assessment categories
The manufacturer is responsible for classifying the piping into the appropriate conformity assessment category in
accordance with the PED Annex II, Tables 6, 7, 8, 9, (see Figure 2 below) depending on the state (gas or liquid),
fluid group, pressure and nominal diameter (DN). The purpose of the category is to aid selection of an appropriate
conformance assessment module, where Category I is the lowest and Category III is the highest shown in the
Tables for piping. Category IV (shown in tables for other equipment) may also be applied to piping (see 4.5 below).
The demarcation lines in the conformity assessment tables extracted from the PED (see Figure 2) indicate the
upper limit for each category. (It should be noted that the figures are plotted on a log-log scale. For a linear-linear
representation, see EEMUA Pub. 196.)
PED Article 3, clause 3 requires that piping below the Category I limits be in accordance with the Sound
Engineering Practice (SEP) of a Member State.
The fluid service categories (D, M) in ANSI/ASME B31.3 are not related to the conformity assessment categories in
the PED.
Key
a) PED Annex II Table 6
b) PED Annex II Table 7
c) PED Annex II Table 8
d) PED Annex II Table 9
Figure 2 – Conformity assessment tables for piping
The PED includes the following qualifications to the Tables 6 and 7:
 Table 6: Exceptionally, piping intended for unstable gases and falling within Categories I or II on the basis of
Table 6 should be classified in Category III.
 Table 7: Exceptionally, all piping containing fluids at a temperature greater than 350 °C and falling within
Category II on the basis of Table 7 should be classified in Category III.
4.5 Conformity assessment procedures
Conformity assessment is required in order to demonstrate that the essential safety requirements are satisfied
(PED Article 10).
The conformity assessment procedures are specified in modules available for each Category as set out in Tables 2
and 3 below.
Table 2 – Conformity assessment modules
Category Modules
IA
II A1, D1, E1
III B1 + D, B1 + F, B + E, B + C1, H
IV B + D, B + F, G, H1
Table 3 – Description of conformity assessment modules
Module Design Production
A Technical documentation Internal production control
A1 Technical documentation Internal production control with monitoring of the final
assessment
B Type examination
B1 Design examination
C1 Monitoring of final assessment
D Quality assurance for production, final inspection and test
D1 Technical documentation Quality assurance for production, final inspection and test
E Quality assurance for final inspection and test
E1 Technical documentation Quality assurance for final inspection and test
F Product verification
G Unit verification Unit verification
H Quality assurance for design, manufacture, final inspection and test
H1 Quality assurance for design, manufacture, final inspection and test, with design examination
and monitoring of final assessment
The conformity assessment procedures corresponding to the modules are set out in PED Annex III. The
procedures may include internal production control, third party inspection, and quality assurance. It is for the
manufacturer to choose, depending on the Category, whether he wishes to opt for a module that requires full QA
with just auditing by a notified body, or for a module with full third party inspection, or for a module with a
combination. The execution of the procedure is by the manufacturer, notified body, user inspectorate or third party
organisation (PED Article 13), depending on the Category.
The owner or user may specify in the contract the module that is preferred. The manufacturer can always choose to
use a module from a higher Category, e.g. from Category IV (PED Article 10, clause 1.4 and Guideline 2/11).
Piping in Category I and SEP does not require the involvement of notified bodies. For piping using modules for
Categories II and III, a notified body will need to be involved, except for those modules where a user inspectorate is
permitted. User inspectorates are not permitted to apply any of the Category III modules (the highest piping
Category). However Category IV permits the use of Module G, which can be applied by user inspectorates (PED
Article 14, clause 6). It may therefore be to the user’s advantage to choose to apply that Category IV module to
Category III piping. It should be further noted that the use of a module from a higher Category does not change the
classification of the equipment being assessed (Guideline 2/11).
For conformity assessment Modules A1, C1, F and G, designated user inspectorates may carry out the tasks of
notified bodies within their own organisations. The CE marking is not to be affixed to pressure equipment and
assemblies assessed by a user inspectorate.
For piping below the Category I limits conformity assessment is not required, but requirements for design,
manufacture, instructions for use and markings should be in accordance with SEP of a Member State (see 4.4
above). It is expected that the basic requirements of ANSI/ASME B31.3 will be considered generally acceptable in
the Member States.
Once conformity assessment has been completed, the manufacturer is required to affix the CE marking (PED
Article 15) and draw up a declaration of conformity (PED Annex VII). It should be noted that the manufacturer is not
required by the PED to provide the declaration of conformity to the user (see 7.3.4 below).
4.6 Hazard analysis
Hazard analysis is fundamental to the design process. Where the manufacturer of the equipment is not cognisant
of overall HAZOP studies, he should be made aware of the scope of his responsibilities in respect of hazards on
account of pressure.
After the manufacturer has ascertained or determined the operating conditions of the equipment (e.g. pressure,
temperature, fluid etc.), and their limits, he should complete a hazard analysis (see Guideline 8/4) which will enable
the essential requirements which are applicable to the equipment to be identified.
The results of this analysis (applicable essential requirements in relation to the foreseeable operating conditions)
shall be included in the technical documentation, but the inclusion of full details of the analysis in the
documentation is not required by PED.
5 Materials
5.1 Material selection and appraisal
The current engineering practice where designers using ANSI/ASME B31.3 would normally select one of the code's
listed materials or established alternatives, and would base calculations on the material's listed properties, differs
from that of the PED. Under the PED the manufacturer needs to adhere to the essential safety requirements of that
Directive by using appropriate materials (pipe, flanges, elbows, weldolets and other piping components) satisfying
one of the following conditions:
a) conforming to a harmonised standard;
b) covered by a European Approval of Materials (EAM) in accordance with PED Article 11;
c) evaluated by a Particular Material Appraisal (PMA) (see Guideline 9/13); PMAs may be carried out in
accordance with EN 764-4.
Materials that comply with harmonised standards mandated under the PED or have EAM status ((a) and (b) above)
are published in the Official Journal of the European Communities and listed on the PED website. ASTM piping
materials are not generally included in the European harmonised standards.
For traditional ASME/ASTM materials the options are (b) and (c) above. However, to date (2003) materials
applications submitted via the EAM route have been contested under the PED Article 11 process and are currently
unsuccessful.
It is envisaged that the PMA route will be the one by which non-harmonised materials will be approved for the
foreseeable future. Timing and process will need to be managed in order to avoid additional costs and project
delays. The PMA is valid only for a particular application and is part of the technical documentation provided by the
manufacturer. It should be noted that for pressurised parts to be used in Category III piping, the PMA needs to be
performed by the notified body responsible for undertaking the conformity assessment for the piping system.
5.2 Material certification
For material certification see Guidelines 7/5, 7/7, 7/8. The material manufacturer shall provide a certificate of
specific product control for main pressure bearing parts of piping in Categories II and III. For metallic materials
these are inspection certificates EN 10204 type 3.1.B and type 3.1.C, and inspection reports EN 10204 type 3.2.
Guideline 7/5 offers greater detail, Guideline 7/7 relates to quality control.
It should be noted that ANSI/ASME B31.3 does not require material test reports or other certification beyond that
detailed in the material specifications.
For bolting parts used as a main pressure bearing part (flange bolting), EN 10204 type 3.1.B and type 3.1.C are
required for piping in categories II and III. (Guideline 7/8).
6 Design and calculation
6.1 Allowable stresses
The provisions for allowable stresses and factors stated in ESR 7.1, PED Annex I, are a general rule, and the
manufacturer may choose different values, provided that the choice is justifiable and consistent with good design
principles, and achieves an equivalent level of safety. Much depends on the judgement of the manufacturer or,
when a notified body is involved, agreement between notified body and manufacturer. If factors other than those in
ESR 7.1 have been used, owners should ask for the justification in the technical documentation.
The design basis in PED Annex I (7.1) is not quite the same as in ANSI/ASME B31.3. Generally for steels
ANSI/ASME B31.3 uses the lower of
 
 
 

 
/12 tensile strength. Therefore for many materials, the design stresses in ANSI/ASME B31.3 are more
conservative and may be used. However for austenitic steel the PED may be more conservative. (See Table
D.7, 7.1 Allowable stresses.)
For creep conditions ANSI/ASME B31.3 uses 100 000 hour data, whilst the PED is silent on the criteria to be used.
6.2 Joint coefficients
The provisions for joint coefficients stated in ESR 7.2, PED Annex I, are also a general rule and, with regard to
selecting values, the same approach should be adopted as for allowable stresses.
Where joint coefficients in the PED and in ANSI/ASME B31.3 are different, use of the lower value will be
conservative.
Note that ANSI/ASME B31.3 gives longitudinal weld joint factors. The PED Annex I (7.2) does not restrict itself to longitudinal
welds, and its meaning should be agreed at the outset of a contract.
6.3 Isolation
Where Group 1 fluids are contained in the piping, appropriate means are to be provided to isolate any "take-off"
pipes whose size represents a significant risk (see PED Annex I, 6(e)).
Positive isolation may be achieved in one of the following ways:
a) by removal of a flanged spool piece or valve and the fitting of blank flanges to the open ended pipes;
b) by (swung) line blind;
c) by a spade. The arrangements of spading points, together with venting, draining and purging facilities, should
enable a section of line containing a spade to be checked as free from pressure before spade insertion or
removal.
7 Fabrication and installation
7.1 Permanent joining (e.g. Welding)
For piping in Categories II and III, the joining procedures and personnel are to be approved by either of the
following, at the manufacturer’s discretion (see PED Annex I, sub-clause 3.1.2):
 a notified body; or
 a third-party organisation recognised for this purpose by a European Member State.
A list of such organisations is published in the Official Journal of the European Communities and may be found at
the PED website (Ref. 4) under "Who is who". An Authorized Inspector as defined in ASME QAI-1:1998 will not be
sufficient unless his organisation is also recognised as one of the above bodies under the PED.
Qualification (i.e. approval) of welding procedures and of the performance of welders should be in accordance
with ANSI/ASME B31.3. For Categories II and III piping, such approval needs to be in accordance with the
preceding paragraphs of this subsection.
7.2 Traceability
The manufacturer needs to ensure that suitable procedures are established and maintained for identifying the
material making up those components of the equipment which contribute to pressure resistance, from receipt of the
material, through production, up to the final test of the manufactured pressure equipment (see PED Annex I, sub-
clause 3.1.5).
7.3 Documentation
7.3.1 Marking and labelling
ANSI/ASME B31.3 does not make reference to marking and labelling. Such requirements are dealt with
elsewhere – in the United States by the local jurisdictions.
In Europe, in addition to the CE marking (accompanied by the notified body identification number where a notified
body is involved at the production control phase – see Article 15, clause 1), the PED requires the following
information to be provided by the manufacturer on an attached nameplate or, where allowed, in appropriate
documentation (see PED Annex I, sub-clause 3.3):
a) name and address or other means of identification of the manufacturer(s);
b) year of manufacture;
c) identification of equipment (e.g. type, serial number);
d) essential maximum/minimum allowable operating limits (e.g. pressure, temperature);
e) depending on the type of pressure equipment, further information necessary for safe installation, operation or
use and, where applicable, maintenance and periodic inspection such as:
1) test pressure in bar;
2) date of pressure test;
3) fluid group;
4) nominal size, DN;
5) safety device set pressure in bar;
6) the position and route of underground piping to facilitate safe maintenance, inspection or repair (see PED
Annex I, clause 6(g)).
It may be desirable that the nameplate be also marked with the equipment Category (see 7.3.4).
7.3.2 Operating instructions
The PED requires piping to be accompanied, as far as is relevant, by instructions for the user regarding mounting,
putting into service, use and maintenance (see PED Annex I, sub-clause 3.4, and Guideline 8/3). Note that the
PED (Annex I, sub-clause 2.2.3 (b)) requires that features of the design relevant to the life of the equipment be
included, while Guideline 8/3 recommends that the intended life and design code used should be stated. If
experience has shown that misuse might occur, suitable warnings need to be fixed to the piping.
7.3.3 Marking at take-off points
To minimise the risk of inadvertent discharge, the main piping needs to be clearly marked on the permanent side at
all take-off points, indicating the fluid contained (see PED Annex I, clause 6 (f)).
7.3.4 Declaration of conformity
For any conformity assessment module or module combination applicable to piping, the manufacturer is required to
draw up (but not to provide) a declaration of conformity (PED Annex VII). It should be noted that whilst the
declaration of conformity is required to indicate the conformity assessment procedure followed, it is not required to
indicate the equipment Category. Because it is permissible to use a conformity assessment procedure applicable to
a Category higher than that of the equipment being assessed (4.5 above), it is recommended that equipment
Category be always documented with, and preferably on, the declaration of conformity. Consideration may also be
given by the owner/ user to requiring that the equipment Category (including SEP where applicable) be marked on
the nameplate(s) and that copies of declarations of conformity be provided with the relevant equipment.
In addition to any declarations of conformity that may have been drawn up for items of pressure equipment by the
manufacturers of those items, the manufacturer of an assembly is required to perform a global assessment (see
PED Article 10, clause 2) and draw up a "global" declaration of conformity. However if assembly is done on site and
under the responsibility of the user, the global conformity assessment procedure would not normally be carried out
and no CE mark would be affixed. (See PED recital 5 and Guideline 3/1.)
8 Inspection and testing
8.1 Non-destructive tests
Non-destructive testing terminology in ANSI/ASME B31.3 is different from that in the PED (e.g. "spot" versus
"random"), therefore care should be taken to ensure that all parties have a common understanding of the
requirements.
For piping in Category III, the personnel performing non-destructive tests of permanent joints need to be approved
by a third-party organisation recognised for this purpose by a European Member State, see PED Annex I, 3.1.3.
A list of such organisations is published in the Official Journal of the European Communities and may be found at
the PED website under "Who is who".
8.2 Final inspection
Piping needs to undergo a final inspection to assess, visually and by review of the accompanying documents,
compliance with the PED requirements: see PED Annex I, sub-clause 3.2.1, and Guideline 6/2. ANSI/ASME B31.3
inspection requirements cover all the PED requirements except for the requirement to examine technical
documentation.
ANSI/ASME B31.3 requires an inspection by the owner’s inspector. The PED requirements depend on the
conformity assessment module, for example with inspection by a notified body or user inspectorate, type approval,
or quality assurance system.
For assemblies, the final assessment needs to include a check of the safety devices to verify compliance with the
requirements of PED Annex I, sub-clause 2.10.
9 Safety devices
With respect to safety devices, the requirements of the PED and of ANSI/ASME B31.3 are similar.
The PED requires CE-marked safety devices to be classified as Category IV, unless the device is manufactured for
specific equipment classified in a lower Category (PED Annex II, clause 2).
The PED requires that pressure limiting devices need to be so designed that the pressure will not permanently
exceed the maximum allowable pressure and a short duration pressure surge will not exceed 10 % of the maximum
allowable pressure. The 10 % pressure surge restriction does not apply to the fire case, see Guideline 5/2.
The allowances for pressure and temperature variations in 302.2.4 (f) of ANSI/ASME B31.3:1999 are not
applicable.
Annex A
(informative)
Checklist of major actions arising from the PED
Table A.1 - Checklist of major actions
Action Reference clause
in this guide

Determine if the piping is within the scope of the PED 4.1

Identify the “manufacturer” and determine and assign his responsibilities, at 4.2
the start of a contract, for each component and assembly

Determine fluid Groups 4.3

Determine Category(ies) 4.4

Choose conformity assessment modules (PED Article 10) 4.5

Determine extent of notified body involvement 4.5

Perform hazard analysis in order to determine the applicable ESRs 4.6

Ensure that materials to be used in pressurised parts fulfil one of the 5.1
requirements given in PED Annex I, 4.2 (b)

Ensure that materials to be used in pressurised parts are traceable (PED 7.2
Annex I, 3.1.5)

Ensure third party approval for welding procedures and welder qualification 7.1
for Categories II and III (PED Annex I, 3.1.2), and for NDE personnel
qualification for Category III (PED Annex I, 3.1.3).

Manufacturer to draw up global declaration of conformity and affix CE 4.5, 7.3.1 and 7.3.4
markings.

Manufacturer to identify marking and labelling requirements of the PED 7.3
ESRs
Annex B
(informative)
Key articles in the PED
B.1 Introduction
This annex provides a guide to those Articles of the PED which differ from requirements in ISO 15649 and
ANSI/ASME B31.3; these are termed "key articles" in this annex.
Annex D provides a similar guide to the ESRs of the PED.
B.2 Table of Key Articles in the PED
For each of the key PED Articles, Table B.1 identifies the clauses of ISO 15649, ANSI/ASME B31.3 and this Guide
that are relevant to PED compliance. The required actions are listed under Notes/Actions Required.
Table B.1 is based on ANSI/ASME B31.3 – 1999 Edition, Process Piping, including ANSI/ASME B31.3a –
2000 Addenda.
Table B.1 – Key articles in PED
PED Compliance
ANSI/ASME
PED Article B31.3 Notes / Actions Required
ISO 15649 Guide
Reference
clause clause
1 3 The following are excluded from the scope of this Directive: 300.1 Identify “standard pressure equipment” NOT excluded from PED 1.4 1
3.1 Pipelines comprising piping or a system of piping designed for Identify piping etc which will be subject to PED.
the conveyance of any fluid or substance to or from an
See also Guidelines 1/28 and 1/29.
installation (onshore or offshore) starting from and including the
last isolation device located within the confines of the
installation, including all the annexed equipment designed
specifically for pipelines. This exclusion does not apply to
standard pressure equipment such as may be found in pressure
reduction stations or compression stations;
3 1 The pressure equipment referred to in 1.1, 1.2, 1.3 and 1.4 must 300.1.3(a) Identify piping etc. which will be subject to PED Annex I Essential Annexe D
satisfy the essential requirements set out in Annex I: Safety Requirements or other national standards/guidelines
1.3 Piping intended for:
a) gases, liquefied gases, gases dissolved under pressure,
vapours and those liquids whose vapour pressure at the
maximum allowable temperature is greater than 0,5 bar above
normal atmospheric pressure (1013 mbar) within the following
limits:
— for fluids in Group 1 with a DN greater than 25 (Annex II,
Table 6);
— for fluids in Group 2 with a DN greater than 32 and a product of
PS and DN greater than 1 000 bar (Annex II, Table 7);
b) liquids having a vapour pressure at the maximum allowable
temperature of not more than 0,5 bar above normal atmospheric
pressure (1 013 mbar), within the following limits:
— for fluids in Group 1 with a DN greater than 25 and a product of
PS and DN greater than 2 000 bar (Annex II, Table 8);
— for fluids in Group 2 with a PS greater than 10 bar, a DN greater
than 200 and a product of PS and DN greater than 5 000 bar
(Annex II, Table 9).
(to be continued)
Table B.1 (continued)
PED Compliance
ANSI/ASME
PED Article B31.3 Notes / Actions Required
ISO 15649 Guide
Reference
clause clause
3 1.4 Safety and pressure accessories intended for equipment
(continue) covered by 1.1, 1.2 and 1.3 including where such equipment
is incorporated into an assembly.
2 The assemblies defined in Article 1, section 2.1.5, which
include at least one item of pressure equipment covered by
section 1 of this Article and which are listed in 2.1, 2.2 and
2.3 of this Article must satisfy the essential requirements set
out in Annex I.
2.1 Assemblies intended for generating steam or superheated
water at a temperature highe
...