Pressure equipment and assemblies - Part 8: Proof test

This document specifies the purpose, form and procedure of proof testing by pressure test of items of pressure equipment and assemblies.
It also specifies how to determine the value of the test pressure.

Druckgeräte und Zusammenbauten- Teil 8: Druckprüfung

Dieses Dokument legt den Zweck, die Form und die Durchführung der Druckprüfung anhand von Druck-versuchen an Druckgeräteteilen und Baugruppen fest.
Es legt ebenfalls das Verfahren für die Bestimmung des Druckwertes für den Druckversuch fest.

Équipements sous pression et ensembles - Partie 8 : Épreuve

Le présent document précise le but, la forme et la procédure de l'épreuve par essai de pression des équipements et ensembles sous pression.
Il spécifie également comment déterminer la valeur de l'essai de pression.

Tlačna oprema in sklopi - 8. del: Preskušanje

Ta dokument določa namen, obliko in postopek preskušanja s tlačnim preskusom delov tlačne opreme in sklopov. Opredeljuje tudi način za določitev vrednosti preskusnega tlaka.

General Information

Status
Published
Public Enquiry End Date
01-Feb-2016
Publication Date
05-Sep-2016
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
19-Apr-2016
Due Date
24-Jun-2016
Completion Date
06-Sep-2016

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SLOVENSKI STANDARD
kSIST-TS FprCEN/TS 764-8:2016
01-januar-2016
7ODþQDRSUHPDLQVNORSLGHO3UHVNXãDQMH
Pressure equipment and assemblies - Part 8: Proof test
Druckgeräte und Zusammenbauten- Teil 8: Druckprüfung
Équipements sous pression et ensembles - Partie 8 : Épreuve
Ta slovenski standard je istoveten z: FprCEN/TS 764-8
ICS:
23.020.30 7ODþQHSRVRGHSOLQVNH Pressure vessels, gas
MHNOHQNH cylinders
kSIST-TS FprCEN/TS 764-8:2016 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
kSIST-TS FprCEN/TS 764-8:2016
---------------------- Page: 2 ----------------------
kSIST-TS FprCEN/TS 764-8:2016
FINAL DRAFT
TECHNICAL SPECIFICATION
FprCEN/TS 764-8
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
November 2015
ICS 23.020.30
English Version
Pressure equipment and assemblies - Part 8: Proof test

Équipements sous pression et ensembles - Partie 8 : Druckgeräte und Zusammenbauten- Teil 8:

Épreuve Druckprüfung

This draft Technical Specification is submitted to CEN members for formal vote. It has been drawn up by the Technical

Committee CEN/TC 54.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a Technical Specification. It is distributed for review and comments. It is subject to change

without notice and shall not be referred to as a Technical Specification.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. FprCEN/TS 764-8:2015 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
kSIST-TS FprCEN/TS 764-8:2016
FprCEN/TS 764-8:2015 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

Introduction .................................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 5

2 Terms and definitions ................................................................................................................................... 5

3 Symbols and abbreviations ......................................................................................................................... 6

4 General ................................................................................................................................................................ 6

4.1 Purpose of proof testing by pressure test .............................................................................................. 6

4.2 Form of the pressure test ............................................................................................................................. 6

4.3 Pressure test procedure ............................................................................................................................... 7

5 Pressure equipment ....................................................................................................................................... 7

5.1 Hydrostatic test ................................................................................................................................................ 7

5.1.1 Basic rule ............................................................................................................................................................ 7

5.1.2 Specific adjustment ........................................................................................................................................ 8

5.1.3 Creep consideration ....................................................................................................................................... 8

5.2 Pneumatic test .................................................................................................................................................. 8

6 Assemblies ......................................................................................................................................................... 9

Annex A (informative) Guidelines from the European Commission ......................................................... 10

Bibliography ................................................................................................................................................................. 12

---------------------- Page: 4 ----------------------
kSIST-TS FprCEN/TS 764-8:2016
FprCEN/TS 764-8:2015 (E)
European foreword

This document (FprCEN/TS 764-8:2015) has been prepared by Technical Committee CEN/TC 54

“Unfired pressure vessels”, the secretariat of which is held by BSI.
This document is currently submitted to the Formal Vote.
This European Standard consists of eight parts, which are currently:
Part 1 Vocabulary;
Part 2 Quantities, symbols and units;
Part 4 Establishment of technical delivery conditions for metallic materials;

Part 5 Inspection documentation of metallic materials and compliance with the material specification;

Part 6 Structure and content of operating instructions [technical report];
Part 7 Safety systems for unfired pressure equipment;
Part 8 Proof test [technical specification].
---------------------- Page: 5 ----------------------
kSIST-TS FprCEN/TS 764-8:2016
FprCEN/TS 764-8:2015 (E)
Introduction

This document is intended to establish a common approach for the proof testing by pressure test of

items of pressure equipment and assemblies, in order to fulfil the essential requirement 3.2.2 of

Annex 1 of the pressure equipment directive 97/23/CE.

It is intended to be used as a basis in the specific product standards, or directly by a manufacturer.

It takes into account the existing guidelines adopted by the European Commission, detailed in Annex A.

For the determination of the pressure test value, this document provides two methods in 5.1. Further

investigation will take place, in order to better specify the method to be retained in the future. The

determination of the nominal design stress will be part of this analysis.

CEN technical committees, which apply this document in their product standard, are encouraged to give

feedback to CEN/TC 54, for the future revision of this document.
---------------------- Page: 6 ----------------------
kSIST-TS FprCEN/TS 764-8:2016
FprCEN/TS 764-8:2015 (E)
1 Scope

This document specifies the purpose, form and procedure of proof testing by pressure test of items of

pressure equipment and assemblies.
It also specifies how to determine the value of the test pressure.
2 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
NOTE Other useful definitions can be found in EN 764–1 to -7.
2.1
pressure equipment

vessel, piping, safety accessory or pressure accessory with a maximum allowable pressure PS greater

than 0,5 bar

Note 1 to entry: Where applicable, pressure equipment includes elements attached to pressurized parts, such as

flanges, nozzles, couplings, supports, lifting lugs, etc.
[SOURCE: Directive 97/23/CE]
2.2
assembly

several pieces of pressure equipment assembled by a manufacturer to constitute an integrated and

functional whole
[SOURCE: Directive 97/23/CE]
2.3
product standard

standard that specifies requirements to be fulfilled by a product or a group of products, to establish its

fitness for purpose

Note 1 to entry: For this document, a product standard is a standard dealing with a pressure equipment or an

assembly.
[SOURCE: EN 45020]
2.4
maximum allowable pressure

maximum pressure for which the equipment is designed, as specified by the manufacturer

Note 1 to entry: The subscript “max” is added to the symbol for maximum values.
[SOURCE: EN 764-1]
---------------------- Page: 7 ----------------------
kSIST-TS FprCEN/TS 764-8:2016
FprCEN/TS 764-8:2015 (E)
2.5
test pressure
pressure to which the equipment is subjected for test purposes
[SOURCE: EN 764-1]
3 Symbols and abbreviations

For the purposes of this document, the symbols and abbreviations shall be in accordance with Table 1.

Table 1 — Symbols, descriptions and units
Symbol Description Unit
a maximum allowable pressure b
PS, p MPa
a test pressure b
PT, p MPa
c material strength characteristic MPa
p or p for calculation purposes ; PS or PT for marking purposes
s t
MPa for calculation purpose, otherwise the unit may be bar (1 MPa = 10 bar)

subscript 20 or T is used for ambient temperature or maximum allowable temperature, respectively

4 General
4.1 Purpose of proof testing by pressure test

Proof testing by pressure test shall be a test for the pressure containment aspect, which verifies the

adequacy of manufacture. In addition, it can demonstrate tightness of the equipment.

NOTE 1 The proof testing by pressure test is not primarily intended to prove the design or to change material

behaviour or dimensioning of the equipment.

NOTE 2 Leak tightness, in the frame of this document, only considers testing under positive hydraulic or

pneumatic pressure and aims at ensuring a visually leak tight assembly without a precise quantification. If

necessary, additional tightness test are conducted as per the requirements of the product standard.

4.2 Form of the pressure test

For pressure equipment, the hydrostatic pressure test, as described in 5.1, shall be the standard

pressure test. If this is not practical then it may be substituted by:
a) a pneumatic test as described in 5.2;
b) a combined hydrostatic/pneumatic test.

The manufacturer shall document the form of the pressure test in the documentation, which shall be

reviewed before manufacturing commencing.
For assemblies, refer to Clause 6.
---------------------- Page: 8 ----------------------
kSIST-TS FprCEN/TS 764-8:2016
FprCEN/TS 764-8:2015 (E)
4.3 Pressure test procedure

Any item of pressure equipment shall be subjected to a pressure test; however items of category I may

be tested on a statistical basis.
The test sequence shall consist of the following:
— filling the equipment and pressurising it gradually;
— maintaining the required test pressure for a sufficient length of time;
— reducing the pressure for inspection where necessary;

— visually inspecting it to check if there has been any deterioration, deformation and/or leak

resulting from the pressure test;
— deciding if any possible deterioration, deformation and/or leak is acceptable;
— then, fully draining and cleaning the equipment.

Items that have a value of p less than that determined in accordance with the requirements of Clause 5,

and that are not part of the pressure-bearing housing of the equipment, shall be removed or isolated

during the pressure test.
For assemblies, refer to Clause 6.
5 Pressure equipment
5.1 Hydrostatic test
5.1.1 Basic rule

The test pressure shall be based on p and k, with possible specific adjustment as stated in 5.1.2.

NOTE Design takes account of maximum loadings and variation in allowable stresses across the design

temperature range
...

SLOVENSKI STANDARD
SIST-TS CEN/TS 764-8:2016
01-oktober-2016
7ODþQDRSUHPDLQVNORSLGHO3UHVNXãDQMH
Pressure equipment and assemblies - Part 8: Proof test
Druckgeräte und Zusammenbauten- Teil 8: Druckprüfung
Équipements sous pression et ensembles - Partie 8 : Épreuve
Ta slovenski standard je istoveten z: CEN/TS 764-8:2016
ICS:
23.020.32 7ODþQHSRVRGH Pressure vessels
SIST-TS CEN/TS 764-8:2016 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST-TS CEN/TS 764-8:2016
---------------------- Page: 2 ----------------------
SIST-TS CEN/TS 764-8:2016
CEN/TS 764-8
TECHNICAL SPECIFICATION
SPÉCIFICATION TECHNIQUE
June 2016
TECHNISCHE SPEZIFIKATION
ICS 23.020.30
English Version
Pressure equipment and assemblies - Part 8: Proof test

Équipements sous pression et ensembles - Partie 8: Druckgeräte und Zusammenbauten- Teil 8:

Épreuve Druckprüfung

This Technical Specification (CEN/TS) was approved by CEN on 8 March 2016 for provisional application.

The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to

submit their comments, particularly on the question whether the CEN/TS can be converted into a European Standard.

CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS

available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in

parallel to the CEN/TS) until the final decision about the possible conversion of the CEN/TS into an EN is reached.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 764-8:2016 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST-TS CEN/TS 764-8:2016
CEN/TS 764-8:2016 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

Introduction .................................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 5

2 Terms and definitions ................................................................................................................................... 5

3 Symbols and abbreviations ......................................................................................................................... 6

4 General ................................................................................................................................................................ 6

4.1 Purpose of proof testing by pressure test .............................................................................................. 6

4.2 Form of the pressure test ............................................................................................................................. 6

4.3 Pressure test procedure ............................................................................................................................... 7

5 Pressure equipment ....................................................................................................................................... 7

5.1 Hydrostatic test ................................................................................................................................................ 7

5.1.1 Basic rule ............................................................................................................................................................ 7

5.1.2 Specific adjustment ........................................................................................................................................ 8

5.1.3 Creep consideration ....................................................................................................................................... 8

5.2 Pneumatic test .................................................................................................................................................. 8

6 Assemblies ......................................................................................................................................................... 9

Annex A (informative) Guidelines from the European Commission ......................................................... 10

Bibliography ................................................................................................................................................................. 12

---------------------- Page: 4 ----------------------
SIST-TS CEN/TS 764-8:2016
CEN/TS 764-8:2016 (E)
European foreword

This document (CEN/TS 764-8:2016) has been prepared by Technical Committee CEN/TC 54 “Unfired

pressure vessels”, the secretariat of which is held by BSI.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent

rights.
This European Standard consists of eight parts, which are currently:
Part 1 Vocabulary;
Part 2 Quantities, symbols and units;
Part 4 Establishment of technical delivery conditions for metallic materials;

Part 5 Inspection documentation of metallic materials and compliance with the material specification;

Part 6 Structure and content of operating instructions [technical report];
Part 7 Safety systems for unfired pressure equipment;
Part 8 Proof test [technical specification].

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the

following countries are bound to announce this Technical Specification: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
---------------------- Page: 5 ----------------------
SIST-TS CEN/TS 764-8:2016
CEN/TS 764-8:2016 (E)
Introduction

This document is intended to establish a common approach for the proof testing by pressure test of

items of pressure equipment and assemblies, in order to fulfil the essential requirement 3.2.2 of

Annex 1 of the pressure equipment directive 97/23/CE.

It is intended to be used as a basis in the specific product standards, or directly by a manufacturer.

It takes into account the existing guidelines adopted by the European Commission, detailed in Annex A.

For the determination of the pressure test value, this document provides two methods in 5.1. Further

investigation will take place, in order to better specify the method to be retained in the future. The

determination of the nominal design stress will be part of this analysis.

CEN technical committees, which apply this document in their product standard, are encouraged to give

feedback to CEN/TC 54, for the future revision of this document.
---------------------- Page: 6 ----------------------
SIST-TS CEN/TS 764-8:2016
CEN/TS 764-8:2016 (E)
1 Scope

This document specifies the purpose, form and procedure of proof testing by pressure test of items of

pressure equipment and assemblies.
It also specifies how to determine the value of the test pressure.
2 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
NOTE Other useful definitions can be found in EN 764–1 to -7.
2.1
pressure equipment

vessel, piping, safety accessory or pressure accessory with a maximum allowable pressure PS greater

than 0,5 bar

Note 1 to entry: Where applicable, pressure equipment includes elements attached to pressurized parts, such as

flanges, nozzles, couplings, supports, lifting lugs, etc.
[SOURCE: Directive 97/23/CE]
2.2
assembly

several pieces of pressure equipment assembled by a manufacturer to constitute an integrated and

functional whole
[SOURCE: Directive 97/23/CE]
2.3
product standard

standard that specifies requirements to be fulfilled by a product or a group of products, to establish its

fitness for purpose

Note 1 to entry: For this document, a product standard is a standard dealing with a pressure equipment or an

assembly.
[SOURCE: EN 45020]
2.4
maximum allowable pressure

maximum pressure for which the equipment is designed, as specified by the manufacturer

Note 1 to entry: The subscript “max” is added to the symbol for maximum values.
[SOURCE: EN 764-1]
---------------------- Page: 7 ----------------------
SIST-TS CEN/TS 764-8:2016
CEN/TS 764-8:2016 (E)
2.5
test pressure
pressure to which the equipment is subjected for test purposes
[SOURCE: EN 764-1]
3 Symbols and abbreviations

For the purposes of this document, the symbols and abbreviations shall be in accordance with Table 1.

Table 1 — Symbols, descriptions and units
Symbol Description Unit
a maximum allowable pressure b
PS, p MPa
a test pressure b
PT, p MPa
c material strength characteristic MPa
p or p for calculation purposes ; PS or PT for marking purposes
s t
MPa for calculation purpose, otherwise the unit may be bar (1 MPa = 10 bar)

subscript 20 or T is used for ambient temperature or maximum allowable temperature, respectively

4 General
4.1 Purpose of proof testing by pressure test

Proof testing by pressure test shall be a test for the pressure containment aspect, which verifies the

adequacy of manufacture. In addition, it can demonstrate tightness of the equipment.

NOTE 1 The proof testing by pressure test is not primarily intended to prove the design or to change material

behaviour or dimensioning of the equipment.

NOTE 2 Leak tightness, in the frame of this document, only considers testing under positive hydraulic or

pneumatic pressure and aims at ensuring a visually leak tight assembly without a precise quantification. If

necessary, additional tightness test are conducted as per the requirements of the product standard.

4.2 Form of the pressure test

For pressure equipment, the hydrostatic pressure test, as described in 5.1, shall be the standard

pressure test. If this is not practical then it may be substituted by:
a) a pneumatic test as described in 5.2;
b) a combined hydrostatic/pneumatic test.

The manufacturer shall document the form of the pressure test in the documentation, which shall be

reviewed before manufacturing commencing.
For assemblies, refer to Clause 6.
NOTE Local regulations may apply to the performance of pneumatic testing.
---------------------- Page: 8 ----------------------
SIST-TS CEN/TS 764-8:2016
CEN/TS 764-8:2016 (E)
4.3 Pressure test procedure

Any item of pressure equipment shall be subjected to a pressure test; however items of category I may

be tested on a statistical basis.
The test sequence shall consist of the following:
— filling the equipment and pressurising it gradually;
— maintaining the required test pressure for a sufficient length of time;
— reducing the pressure for inspection where necessary;

— visually inspecting it to check if there has been any deterioration, deformation and/or leak

resulting from the pressure test;
— deciding if any possible deterioration, deformation and/or leak is acceptable;
— then, fully draining and cleaning the equipment.
Items that ha
...

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