ISO 5208:2015
(Main)Industrial valves — Pressure testing of metallic valves
Industrial valves — Pressure testing of metallic valves
ISO 5208:2015 specifies examinations and tests that a valve manufacturer needs to act upon in order to establish the integrity of the pressure boundary of an industrial metallic valve and to verify the degree of valve closure tightness and the structural adequacy of its closure mechanism. This International Standard is intended to be applied in conjunction with the specific requirements of a valve product standard to the extent cited by the product standard as a normative reference. Where requirements of a product standard differ from those given in this International Standard, the requirements of the product standard apply. ISO 5208:2015 is not applicable to the safety aspects of pressure testing.
Robinetterie industrielle — Essais sous pression des appareils de robinetterie métalliques
General Information
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 5208
Fourth edition
2015-06-15
Industrial valves — Pressure testing of
metallic valves
Robinetterie industrielle — Essais sous pression des appareils de
robinetterie métalliques
Reference number
ISO 5208:2015(E)
©
ISO 2015
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ISO 5208:2015(E)
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© ISO 2015, Published in Switzerland
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ISO 5208:2015(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Terms and definitions . 1
3 Conditions relevant to pressure testing . 2
3.1 Purchaser examination options . 2
3.2 Witnessing . 3
3.3 Closure pressure testing options . 3
4 Requirements for pressure testing . 3
4.1 Forewarning . 3
4.2 Location . 3
4.3 Test equipment . 3
4.4 Pressure measuring equipment . 3
4.5 Shell surfaces . 3
4.6 Test fluid . 4
4.7 Test pressure. 4
4.8 Pressure tests . 4
4.9 Closure test compliance . 4
4.10 Shell test. 6
4.10.1 Shell test fluid . 6
4.10.2 Shell test procedure . 6
4.10.3 Shell test pressure . 6
4.10.4 Shell test duration . 6
4.10.5 Shell test acceptance criteria . 6
4.11 Optional backseat test . 7
4.11.1 General. 7
4.11.2 Backseat test fluid . 7
4.11.3 Recommended backseat test procedure . 7
4.11.4 Backseat test pressure . 7
4.11.5 Backseat test duration . 7
4.11.6 Backseat test acceptance criteria . 8
4.12 Closure test . 8
4.12.1 General requirements . 8
4.12.2 Closure test fluid . 8
4.12.3 Leak detection . 8
4.12.4 Closure test pressure. 9
4.12.5 Closure test duration . 9
4.12.6 Closure test progression . 9
4.12.7 Closure test acceptance criteria . 9
4.13 Certification of compliance . 9
Annex A (normative) Equivalent DN numbers .12
Bibliography .13
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ISO 5208:2015(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 153, Valves.
This fourth edition cancels and replaces the third edition (ISO 5208:2008), which has been technically
revised including the following changes:
— a new definition 2.12 of visually detectable leakage was added;
— Table 1 has been updated by differencing concentric and eccentric butterfly valves and by adding an
optional high pressure closure test with gas;
— 4.12.4.1 a) has been updated to take into account nominal pressures PN 6 and lower.
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ISO 5208:2015(E)
Introduction
The purpose of this International Standard is the establishment of basic requirements and practices for
pressure testing valves of various configurations that are used in general purpose, power generation,
petroleum, and petrochemical or allied industry applications. The intent is to provide a consistent set
of procedural requirements and acceptance criteria that can be considered in conjunction with valve
specific standards appropriate for specific applications. Account has been taken of the valve testing
requirement needs of EN 12266 and API 598 with requirements referenced for PN designated valves for
the former and Class designated valves for the latter.
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INTERNATIONAL STANDARD ISO 5208:2015(E)
Industrial valves — Pressure testing of metallic valves
WARNING — Persons using this International Standard should be familiar with normal testing
practice. This International Standard does not purport to address all of the safety issues, if
any, associated with its use. It is the responsibility of the user to establish appropriate safety
and health practices and to ensure compliance with any national regulatory requirements in
particular, when using high pressure gas for testing.
1 Scope
This International Standard specifies examinations and tests that a valve manufacturer needs to act
upon in order to establish the integrity of the pressure boundary of an industrial metallic valve and
to verify the degree of valve closure tightness and the structural adequacy of its closure mechanism.
This International Standard is intended to be applied in conjunction with the specific requirements
of a valve product standard to the extent cited by the product standard as a normative reference.
Where requirements of a product standard differ from those given in this International Standard, the
requirements of the product standard apply.
This International Standard is not applicable to the safety aspects of pressure testing.
2 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
2.1
shell test
test at a pressure in excess of the cold working pressure (2.9) rating of a valve for the purpose of validating
the soundness and strength of the valve pressure containing and retaining structures
Note 1 to entry: These structures include valve-actuating mechanisms that have a direct connection to the valve
internals subject to fluid test pressure within the valve proper.
2.2
closure test
pressure test for the purpose of validating leakage through a valve’s closure mechanism
2.3
test pressure
internal pressure (gauge), expressed in bar to which the valve under test is subjected
Note 1 to entry: Unless otherwise noted, gauge pressure is used throughout this International Standard.
5
Note 2 to entry: 1 bar = 10 Pa.
2.4
test fluid
pressurized liquid or gas used to test a valve
2.5
test fluid temperature
temperature of the test fluid, > 5 °C and ≤ 40 °C
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ISO 5208:2015(E)
2.6
resilient seats
broad category of seating surface materials that make up a pliable seat sealing combination, including
elastomeric, polymeric, solid and semi-solid grease seals, either used in combination or used in
conjunction with a mating metallic or ceramic component
2.7
DN or NPS
alphanumeric designation of size that is common for components used in a piping system, used for
reference purposes, comprising the letters DN or NPS followed by a dimensionless number indirectly
related to the physical size of the bore or outside diameter of the end connections
Note 1 to entry: The number following DN or NPS does not represent a measurable value and is not used for
calculation purposes except where specified in a product standard.
2.8
PN or Class
alphanumeric designation for pressure-temperature rating that is common for components used
in a piping system, used for reference purposes, comprising the letters “PN or Class” followed by a
dimensionless number indirectly related to the pressure retaining capability as a function of temperature
of the component
Note 1 to entry: The number following “PN or Class” does not represent a measurable value and is not used for
calculation purposes except where specified in a product standard. There is no definitive correlation that links
PN designations to Class designations.
2.9
cold working pressure
CWP
maximum fluid pressure assigned to a valve for operation at a fluid temperature of −20 °C to 38 °C
Note 1 to entry: Valve pressure-temperature ratings are specified in product standards by reference to PN or
Class designations.
2.10
design differential pressure
limiting pressure difference across the upstream and downstream sides of the closure element seals
when the valve is in the closed position
Note 1 to entry: While the standard is for this to be equal to the CWP there may be circumstances that dictate a
lesser pressure difference.
2.11
double block-and-bleed valve
valve with two separate closure seating surfaces that, when in the closed position, block flow from both
ends where the cavity between the two seating surfaces is fitted with a bleed connection to which either
temporary or permanent piping or piping components may be installed
2.12
visually detectable leakage
leakage during a valve pressure test, either through or past a pressure boundary or closure member
that is observed with normal vision
3 Conditions relevant to pressure testing
3.1 Purchaser examination options
3.1.1 A purchaser may specify, in a valve procurement purchase order, examination and pressure
testing requirements along with the opportunity to be witness to specific in-process examinations and
tests as regards valves that are the subject of the purchase order. In this event, a representative of the
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ISO 5208:2015(E)
purchaser shall be allowed access to those areas of the manufacturer’s site that are involved with related
examination and pressure testing of the purchase order valves.
3.1.2 When a purchaser specifies examinations or testing to be witnessed as described in 3.1.1, the
valve manufacturer shall give notice to the purchaser at least five working days prior to the purchase
order specified activity.
3.2 Witnessing
If pressure testing in the presence of a representative of the purchaser is specified for valves that are
in stock, painted or coated valves from stock may be retested without removal of painting or coating.
3.3 Closure pressure testing options
A purchaser may specify, in a valve procurement purchase order, optional closure testing. See Table 1.
4 Requirements for pressure testing
4.1 Forewarning
A user of this International Standard needs to properly take into account the hazard involved with
working with pressurized gases and liquids.
4.2 Location
Pressure tests shall take place either at the site of the valve manufacture or at a test facility under the
supervision of the valve manufacturer.
4.3 Test equipment
4.3.1 The test equipment shall be of such a design, that it does not subject the valve to externally applied
loads that may affect the results of the test. When end-clamping devices are used, the valve manufacturer
shall be able to demonstrate that, during the valve closure test, they do not serve to reduce the resultant
leakage. Valves designed for installation between flanges, e.g. wafer style check or butterfly valves, shall
not have test equipment clamping forces applied that are so great as to bear upon the pressure test results.
4.3.2 When equipment such as volume loss detection devices are used, the manufacturer shall be
capable of demonstrating equivalence of the system with the requirements of this International Standard.
4.4 Pressure measuring equipment
The equipment used for measuring test fluid pressure shall measure the fluid pressure with an accuracy
of ± 5 % of the required test pressure.
4.5 Shell surfaces
Before the shell test, valves shall not be externally painted or otherwise coated with materials capable of
sealing against leakage from external surfaces of the shell. However, valves with internal liners, internal
linings or internal coatings that form a design feature of the valve may be tested with the liner, lining
or coating in place. In the event a purchaser specifies a retest of the shell test of valves that have been
painted, retesting may be without removal of external paint or coatings.
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ISO 5208:2015(E)
4.6 Test fluid
The test fluid to be used, as specified in the relevant tests detailed in this International Standard, shall be:
— water, that may contain a corrosion inhibitor, kerosene or other appropriate liquid having a viscosity
not greater than that of water, or
— air or other suitable gas.
The temperature of the test fluid shall be between 5 °C and 40 °C. Pressure testing valves with shell
components of austenitic stainless steel, using water as the test fluid, requires that the chloride content
−6
of the water shall not exceed 100 × 10 (100 ppm).
NOTE A purchaser may specify, in a valve procurement purchase order, that a wetting agent be added to
water used as a test fluid.
4.7 Test pressure
Except for low-pressure closure testing, test pressures are related to the valve CWP which in turn is
related to the shell material of the valve under test.
NOTE Piping systems in which valves are installed are subjected to pre-operational pressure te
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