Refrigerating systems and heat pumps - Qualification of tightness of components and joints (ISO 14903:2017)

ISO 14903:2017 provides the qualification procedure for type approval of the tightness of hermetically sealed and closed components, joints and parts used in refrigerating systems and heat pumps as described in relevant parts of ISO 5149. The sealed and closed components, joints and parts concerned are, in particular, fittings, bursting discs, flanged or fitted assemblies. The tightness of flexible piping made from non-metallic materials is dealt with in ISO 13971. Metal flexible piping are covered by this document.
The requirements contained in this document are applicable to joints of maximum DN 50 and components of internal volume of maximum 5 l and maximum weight of 50 kg.
ISO 14903:2017 is intended to characterize their tightness stresses met during their operations, following the fitting procedure specified by the manufacturer, and to specify the minimal list of necessary information to be provided by the supplier of a component to the person in charge of carrying out this procedure.
It specifies the level of tightness of the component, as a whole, and its assembly as specified by its manufacturer.
It applies to the hermetically sealed and closed components, joints and parts used in the refrigerating installations, including those with seals, whatever their material and their design are.
ISO 14903:2017 specifies additional requirements for mechanical joints that can be recognized as hermetically sealed joints.

Kälteanlagen und Wärmepumpen - Qualifizierung der Dichtheit der Bauteile und Verbindungen (ISO 14903:2017)

Systèmes de réfrigération et pompes à chaleur - Qualification de l'étanchéité des composants et des joints (ISO 14903:2017)

ISO 14903:2017 fournit les procédures de qualification pour essai de type de l'étanchéité des composants, joints et éléments hermétiquement scellés et fermés, utilisés dans les systèmes de réfrigération et les pompes à chaleur comme décrits dans les parties pertinentes de l'ISO 5149. Les composants, joints et éléments scellés ou fermés sont notamment les raccords, les disques de rupture ou d'éclatement, les assemblages à brides ou à raccords. L'étanchéité des flexibles en matériaux non métalliques est traitée dans l'ISO 13971. Les flexibles métalliques sont couverts par le présent document.
Les exigences du présent document s'appliquent aux joints de DN 50 maximum et aux composants de 5 l maximum et d'un poids maximal de 50 kg.
ISO 14903:2017 est destiné à caractériser leur étanchéité, les contraintes rencontrées pendant leur fonctionnement, en suivant la procédure de montage spécifiée par le fabricant et à spécifier la liste minimale des informations nécessaires à fournir par le fournisseur d'un composant à la personne chargée de mettre en ?uvre cette procédure.
Il spécifie le niveau d'étanchéité du composant, dans son ensemble, ainsi que son assemblage comme spécifié par son fabricant.
Il est applicable aux composants, joints et éléments hermétiquement scellés et fermés utilisés dans les installations frigorifiques, y compris ceux avec joints d'étanchéité, indépendamment de leur matière et de leur conception.
ISO 14903:2017 spécifie des exigences supplémentaires concernant les joints mécaniques susceptibles d'être considérés comme des joints hermétiquement scellés.

Hladilni sistemi in toplotne črpalke - Ocena tesnosti sestavnih delov in spojev (ISO 14903:2017)

Namen tega evropskega standarda je opisati postopek kvalifikacije za homologacijo tesnosti hermetično zatesnjenih in zaprtih sestavnih delov, spojev in delov, ki se uporabljajo v hladilnih sistemih in toplotnih črpalkah, kot je opisano v standardu EN 378. Zatesnjeni in zaprti sestavni deli, spojniki in zadevni deli so zlasti fitingi, razpočne plošče, prirobnice ali vgrajeni sklopi. Neprepustnost gibkih cevi iz nekovinskih materialov je obravnavana v standardu EN 1736. Ta metoda zajema kovinske gibljive cevi.
Zahteve, ki jih vsebuje ta dokument, se uporabljajo za spoje velikosti največ DN 50 in sestavne dele notranje prostornine največ 5 l in največjo težo 50 kg.
Namen tega dokumenta je opredeliti tesnilne napetosti spojev, ki so bile izpolnjene med njihovim delovanjem, po postopku namestitve, ki ga je določil proizvajalec, in določiti minimalni seznam potrebnih informacij, ki jih dobavitelj sestavnega dela zagotovi osebi, ki je odgovorna za izvajanje tega postopka.
Določa stopnjo tesnosti sestavnega dela kot celote in njegove montaže, kot jo je določil njegov proizvajalec.
Uporablja se za hermetično zatesnjene in zaprte sestavne dele, spoje in dele, ki se uporabljajo v hladilnih napravah, vključno z vsemi tesnili, ne glede na njihov material in njihovo obliko.
Ta evropski standard določa dodatne zahteve za mehanske spoje, ki jih je mogoče prepoznati kot hermetično zatesnjene spoje.

General Information

Status
Published
Publication Date
08-Aug-2017
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
09-Aug-2017
Completion Date
09-Aug-2017

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SLOVENSKI STANDARD
SIST EN ISO 14903:2017
01-oktober-2017
1DGRPHãþD
SIST EN 16084:2011

+ODGLOQLVLVWHPLLQWRSORWQHþUSDONH2FHQDWHVQRVWLVHVWDYQLKGHORYLQVSRMHY ,62



Refrigerating systems and heat pumps - Qualification of tightness of components and

joints (ISO 14903:2017)
Kälteanlagen und Wärmepumpen - Qualifizierung der Dichtheit der Bauteile und
Verbindungen (ISO 14903:2017)

Systèmes de réfrigération et pompes à chaleur - Qualification de l'étanchéité des

composants et des joints (ISO 14903:2017)
Ta slovenski standard je istoveten z: EN ISO 14903:2017
ICS:
27.080 7RSORWQHþUSDONH Heat pumps
27.200 Hladilna tehnologija Refrigerating technology
SIST EN ISO 14903:2017 en

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

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SIST EN ISO 14903:2017
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SIST EN ISO 14903:2017
EN ISO 14903
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2017
EUROPÄISCHE NORM
ICS 27.080; 27.200 Supersedes EN 16084:2011
English Version
Refrigerating systems and heat pumps - Qualification of
tightness of components and joints (ISO 14903:2017)

Systèmes de réfrigération et pompes à chaleur - Kälteanlagen und Wärmepumpen - Qualifizierung der

Qualification de l'étanchéité des composants et des Dichtheit der Bauteile und Verbindungen (ISO

joints (ISO 14903:2017) 14903:2017)
This European Standard was approved by CEN on 10 June 2017.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

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, Serbia, 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

© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 14903:2017 E

worldwide for CEN national Members.
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SIST EN ISO 14903:2017
EN ISO 14903:2017 (E)
Contents Page

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

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SIST EN ISO 14903:2017
EN ISO 14903:2017 (E)
European foreword

This document (EN ISO 14903:2017) has been prepared by Technical Committee ISO/TC 86

“Refrigeration and air-conditioning” in collaboration with Technical Committee CEN/TC 182

“Refrigerating systems, safety and environmental requirements” the secretariat of which is held by DIN.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by February 2018 and conflicting national standards shall

be withdrawn at the latest by February 2018.

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

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 16084:2011.

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

following countries are bound to implement this European Standard: 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, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
Endorsement notice

The text of ISO 14903:2017 has been approved by CEN as EN ISO 14903:2017 without any modification.

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SIST EN ISO 14903:2017
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SIST EN ISO 14903:2017
INTERNATIONAL ISO
STANDARD 14903
Second edition
2017-07
Refrigerating systems and heat
pumps — Qualification of tightness of
components and joints
Systèmes de réfrigération et pompes à chaleur — Qualification de
l’étanchéité des composants et des joints
Reference number
ISO 14903:2017(E)
ISO 2017
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SIST EN ISO 14903:2017
ISO 14903:2017(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved
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SIST EN ISO 14903:2017
ISO 14903:2017(E)
Contents  Page

Foreword ........................................................................................................................................................................................................................................iv

1  Scope ................................................................................................................................................................................................................................. 1

2  Normative references ...................................................................................................................................................................................... 1

3  Terms and definitions ..................................................................................................................................................................................... 2

4  Symbols .......................................................................................................................................................................................................................... 3

5 Test requirements ............................................................................................................................................................................................... 3

6  Requirements for hermetically sealed systems ................................................................................................................... 8

7  Test procedures ..................................................................................................................................................................................................... 8

7.1 General ........................................................................................................................................................................................................... 8

7.2 Sampling ....................................................................................................................................................................................................... 8

7.3 Test temperature ................................................................................................................................................................................... 8

7.4 Tightness test ........................................................................................................................................................................................... 8

7.4.1 General...................................................................................................................................................................................... 8

7.4.2 Tightness level control ........................................................................................................................................... ..... 9

7.5 Requirements for joints ................................................................................................................................................................11

7.5.1 Test samples......................................................................................................................................................................11

7.5.2 Torque ....................................................................................................................................................................................11

7.5.3 Reusable joint ..................................................................................................................................................................12

7.5.4 Requirements for hermetically sealed joints .......................................................................................12

7.6 Pressure-temperature vibration tests (PTV) .............................................................................................................12

7.6.1 General...................................................................................................................................................................................12

7.6.2 Samples .................................................................................................................................................................................12

7.6.3 Test method .......................................................................................................................................................................12

7.6.4 Method 1: Combined pressure-temperature cycle test with integrated

vibration test ....................................................................................................................................................................13

7.6.5 Method 2: Combined pressure-temperature cycle test with a separate

vibration test ....................................................................................................................................................................15

7.7 Operation simulation ......................................................................................................................................................................20

7.8 Freezing test ...........................................................................................................................................................................................20

7.9 Additional pressure test for hermetically-sealed joints ...................................................................................21

7.10 Vacuum test .............................................................................................................................................................................................21

7.11 Compatibility screening test ....................................................................................................................................................22

7.11.1 General...................................................................................................................................................................................22

7.11.2 Test fluids ............................................................................................................................................................................22

7.11.3 Test specimens................................................................................................................................................................22

7.11.4 Test setup parameters ..............................................................................................................................................22

7.11.5 Test procedure ................................................................................................................................................................23

7.11.6 Pass/fail criteria for sealing elements ........................................................................................................23

7.12 Fatigue test for hermetically sealed joints ...................................................................................................................24

8  Test report ................................................................................................................................................................................................................25

9  Information to the user ..............................................................................................................................................................................25

Annex A (informative) Equivalent tightness control levels ........................................................................................................26

Annex B (normative) Test arrangements .....................................................................................................................................................32

Bibliography .............................................................................................................................................................................................................................34

© ISO 2017 – All rights reserved iii
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SIST EN ISO 14903:2017
ISO 14903:2017(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 voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO’s adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following

URL: w w w . i s o .org/ iso/ foreword .html.

This document was prepared by the European Committee for Standardization (CEN) Technical

Committee CEN/TC 182, Refrigerating systems, safety and environmental requirements, in collaboration

with ISO Technical Committee TC 86, Refrigeration and air-conditioning, Subcommittee SC 1, Safety and

environmental requirements for refrigerating systems, in accordance with the Agreement on technical

cooperation between ISO and CEN (Vienna Agreement).

This second edition cancels and replaces the first edition (ISO 14903:2012), which has been technically

revised.
iv © ISO 2017 – All rights reserved
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SIST EN ISO 14903:2017
INTERNATIONAL STANDARD ISO 14903:2017(E)
Refrigerating systems and heat pumps — Qualification of
tightness of components and joints
1  Scope

This document provides the qualification procedure for type approval of the tightness of hermetically

sealed and closed components, joints and parts used in refrigerating systems and heat pumps as

described in relevant parts of ISO 5149. The sealed and closed components, joints and parts concerned

are, in particular, fittings, bursting discs, flanged or fitted assemblies. The tightness of flexible piping

made from non-metallic materials is dealt with in ISO 13971. Metal flexible piping are covered by this

document.

The requirements contained in this document are applicable to joints of maximum DN 50 and

components of internal volume of maximum 5 l and maximum weight of 50 kg.

This document is intended to characterize their tightness stresses met during their operations,

following the fitting procedure specified by the manufacturer, and to specify the minimal list of

necessary information to be provided by the supplier of a component to the person in charge of carrying

out this procedure.

It specifies the level of tightness of the component, as a whole, and its assembly as specified by its

manufacturer.

It applies to the hermetically sealed and closed components, joints and parts used in the refrigerating

installations, including those with seals, whatever their material and their design are.

This document specifies additional requirements for mechanical joints that can be recognized as

hermetically sealed joints.
2  Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 175, Plastics — Methods of test for the determination of the effects of immersion in liquid chemicals

ISO 1817, Rubber, vulcanized or thermoplastic — Determination of the effect of liquids

ISO 5149-1, Refrigerating systems and heat pumps — Safety and environmental requirements — Part 1:

Definitions, classification and selection criteria

ISO 5149-2, Refrigerating systems and heat pumps — Safety and environmental requirements — Part 2:

Design, construction, testing, marking and documentation

ISO 13971, Refrigeration systems and heat pumps — Flexible pipe elements, vibration isolators, expansion

joints and non-metallic tubes — Requirements and classification

IEC 60068-2-64, Environmental testing — Part 2-64: Tests — Test Fh: Vibration, broadband random and

guidance
EN 1593, Non-destructive testing — Leak testing — Bubble emission techniques
EN 13185:2001, Non-destructive testing — Leak testing — Tracer gas method
© ISO 2017 – All rights reserved 1
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SIST EN ISO 14903:2017
ISO 14903:2017(E)
3  Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 5149-1 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
3.1
mass flow rate
value of the leak mass flow rate at any point of the component
Note 1 to entry: The mass flow rate is expressed in grams (g) per year.
3.2
volume flow rate
value of the leak volume flow rate at any point of the component

Note 1 to entry: The volume flow rate is expressed in Pascal cubic metres per second (Pa∙m /s).

3.3
hermetically-sealed system

system in which all refrigerant containing parts are made tight by welding, brazing or a similar

permanent connection which may include capped valves and capped service ports that allow proper

repair or disposal and which have a tested tightness control level of less than 3 g per year under a

pressure of at least a quarter of the maximum allowable pressure

Note 1 to entry: Sealed systems as defined in ISO 5149-1 are equal to hermetically-sealed systems.

3.4
product family

group of products that have the same function, technology, and material for each functional part and

sealing materials
3.5
closed joint

joint other than hermetically-sealed joints where there is no movement between the sealing surfaces

except for service purposes
EXAMPLE Flanged joints.
3.6
closed component

component other than hermetically-sealed components where there is no movement between the

sealing surfaces except for service purpose
EXAMPLE Stop valves, service ports, pressure-relief valves.
3.7
hermetically-sealed joint
joint that are made tight by welding, brazing or a similar permanent connection
3.8
hermetically-sealed component

component that are made tight by welding, brazing or a similar permanent connection

2 © ISO 2017 – All rights reserved
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SIST EN ISO 14903:2017
ISO 14903:2017(E)
3.9
permanent joint
joint which cannot be disconnected except by destructive methods
[SOURCE: Pressure Equipment Directive 2014/68/EU, modified]
3.10
reusable joint
joint made without replacing the sealing material in general procedure

Note 1 to entry: In some cases, the tube is used as sealing material (e.g. flared joint).

3.11
same base material
material belonging to the same group
EXAMPLE Steel group, aluminium and aluminium alloy group or copper group.

Note 1 to entry: Subgroups of these material groups are considered to be same base materials (refer to EN 14276-2).

4  Symbols
Symbol Denomination Unit
Percentage deviation of the minimum and maximum torque from the average of the
D —
minimum and maximum torque, (K – K )/(K + K )
max min min max
f Frequency of vibrations Hz
K Average torques of the respective joint standard Nm
ave

Required maximum torques of the respective joint standard, if specified. Otherwise,

K Nm
max
the maximum torque values supplied by the manufacturer.

Required minimum torques of the respective joint standard, if specified. Otherwise,

K Nm
min
the minimum torque values supplied by the manufacturer.
L Length of tube mm
n Number of cycles in temperature and in pressure (method 1) —
n Number of cycles in temperature and in pressure (method 2) —
n Number of cycles in pressure —
n Number of cycles in vibration —
n Total number of cycles in temperature and in pressure —
total
N Number of samples —
P Tightness test pressure bar
P Maximal pressure of cycle bar
max
P Minimal pressure of cycle bar
min
PS Maximal allowable pressure bar
P Nominal set pressure of the device bar
set
Q Volume flow leakage rate mbar l/s
Q Mass flow leakage rate g/a
s Vibration displacement (peak to peak value) mm
t Maximal temperature of cycle °C
max
t Minimal temperature of cycle °C
min
5 Test requirements

The required tests to be applied to component bodies and joint used in refrigerating systems and heat

pumps are given in Table 1 and in Table 2.
© ISO 2017 – All rights reserved 3
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SIST EN ISO 14903:2017
ISO 14903:2017(E)

Figure 1 illustrates the principle of a component and a joint and their corresponding requirements in

Table 1 or Table 2.
a) According to Table 1
b) According to Table 1
c) According to Table 2
Key
1 joint
2 component body
3 pipe
4 component body joint
5 extension pipe
Figure 1 — Principle: component body-joint
All component types and joints types shall be tested.

When a component may be connected with different types of joints, one of these joints shall be tested

with the component according to Table 1. The other possible types of joints shall be tested independently

according to Table 2.
4 © ISO 2017 – All rights reserved
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SIST EN ISO 14903:2017
ISO 14903:2017(E)
© ISO 2017 – All rights reserved 5
Table 1 — Requirements for component bodies
Requirements
PTV- test Additional test for hermeti-
Chemical
(pres- cally sealed
Components (including valves)
Tightness Operation  compati-
sure-temper- Freezing test Vacuum test
test simulation bility with
ature-vibra-
Pressure test Fatigue test
materials
tion)
Subclause 7.4 7.6 7.7 7.8 7.11 7.10 7.9 7.12
Component bodies having only
permanent body joints: brazing and
YES NO NO NO NO NO NO NO
welding
Identical base materials
Components having permanent body
joints: brazing and welding
YES YES NO NO NO NO NO NO
Different base materials
Component bodies having other YES
YES
permanent body joints (e.g. glue, if operating
YES YES NO if non-metal- YES YES YES
permanent compression fittings, temperature
lic parts
expansion joints) below 0 °C
YES
if any external
YES
stems, shaft YES
Component bodies with non-perma- if operating
YES YES seals or if non-metal- YES Not applicable Not applicable
nent body joints temperature
removable or lic parts
below 0 °C
replaceable
parts

By exception, compressors that comply with the requirements of EN 12693 or IEC 60335-2-34 only need to be subjected to the following test:

— joints connecting to other parts of the refrigerating systems;
— chemical compatibility test for all gaskets (sight glass, etc.).

PTV tests are not required if destructive and non-destructive tests of EN 13134 are carried out.

NOTE Other qualifications for this chemical compatibility done according to other standards are equivalent.

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SIST EN ISO 14903:2017
ISO 14903:2017(E)
6 © ISO 2017 – All rights reserved
Table 1 (continued)
Requirements
PTV- test Additional test for hermeti-
Chemical
(pres- cally sealed
Components (including valves)
Tightness Operation  compati-
sure-temper- Freezing test Vacuum test
test simulation bility with
ature-vibra-
Pressure test Fatigue test
materials
tion)
Subclause 7.4 7.6 7.7 7.8 7.11 7.10 7.9 7.12
YES
YES
Capped valves and capped service if operating
YES YES YES if non-metal- YES YES YES
ports for hermetically sealed systems temperature
lic parts
below 0 °C
YES

Safety valves YES YES NO NO if non-metal- Not applicable Not applicable Not applicable

lic parts
Flexible piping Test according to ISO 13971

By exception, compressors that comply with the requirements of EN 12693 or IEC 60335-2-34 only need to be subjected to the following test:

— joints connecting to other parts of the refrigerating systems;
— chemical compatibility test for all gaskets (sight glass, etc.).

PTV tests are not required if destructive and non-destructive tests of EN 13134 are carried out.

NOTE Other qualifications for this chemical compatibility done according to other standards are equivalent.

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SIST EN ISO 14903:2017
ISO 14903:2017(E)
© ISO 2017 – All rights reserved 7
Table 2 — Requirements for the joining of components
Requirements
PTV- test Chemical  Additional test for hermeti-
Joints and parts
Tightness (pressure- Operation  compati- cally sealed
Freezing test Vacuum test
test temperature- simulation bility with
Pressure test Fatigue test
vibration) materials
Subclause 7.4 7.6 7.7 7.8 7.11 7.10 7.9 7.12
Permanent piping joints: brazing
and welding
YES NO NO NO NO NO NO NO
Identical base materials
Permanent piping joints: brazing
and welding
YES YES NO NO NO NO NO NO
Different base materials
Other permanent piping joints (e.g.
glue, permanent compression fit- YES YES NO YES YES YES YES YES
tings, expansion joints)
YES, if sealing
Non-permanent piping joints YES YES YES YES YES Not applicable Not applicable
material
Gaskets and sealing NO NO NO NO YES NO Not applicable Not applicable
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SIST EN ISO 14903:2017
ISO 14903:2017(E)
6  Requirements for hermetically sealed systems

Hermetically-sealed systems shall be constructed with components which have their tightness control

level qualified as A1 or A2 as per Table 3 or Table 4. These components and joints shall be submitted to

the relevant tests as specified in Tables 1 and 2.
7  Test procedures
7.1 General

The components, joints and part shall pass the tightness test before the other tests are executed. The

different tests are shown in Figure 2.
START
Deine which tests need to
be performed based on
Table 2 and Table 3
Deine the tightness
control level according to
Table 4 and Table 5
For joints, apply 7.5
7.4 Tightness control level
Meets the
7.6 Pressure Temperature tightness control
7.7 Operation simulation 7.4 Tightness control level Pass
Vibration Test (PTV) level in Table 4 and
Table 5
7.8 Freezing test
Fail
7.9 Pressure test for
hemetically sealed
7.10 V
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Questions, Comments and Discussion

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