Metallic tube connections for fluid power and general use - Test methods for hydraulic fluid power connections (ISO 19879:2021)

This document specifies uniform methods for the testing and performance evaluation of metallic tube
connections, stud ends for ports and flange connections for use in hydraulic fluid power applications.
This document does not apply to the testing of hydraulic quick-action couplings, which is covered by
ISO 18869.
Tests outlined in this document are independent of each other and document the method to follow
for each test. See the appropriate component International Standard for indications of which tests to
conduct and for performance criteria.
For qualification of the connector, the minimum number of samples specified in this document is tested,
unless otherwise specified in the relevant connector standard or as agreed upon by the manufacturer
and the user.

Metallische Rohrverschraubungen für Fluidtechnik und allgemeine Anwendung - Prüfverfahren für hydraulische Rohrverschraubungen in der Fluidtechnik (ISO 19879:2021)

Dieses Dokument legt einheitliche Verfahren für die Prüfung und die Bewertung von metallischen Rohrverbindungen, Einschraubzapfen und Flanschverbindungen für Hydraulikanwendungen fest. Dieses Dokument ist nicht anzuwenden für die Prüfung von Hydraulik-Schnellkupplungen, die in ISO 18869 festgelegt sind.
Die in diesem Dokument festgelegten Prüfungen sind voneinander unabhängig und beschreiben das für die jeweilige Prüfung durchzuführende Verfahren. Hinweise zu Prüfanforderungen und Leistungskriterien sind in der jeweiligen Internationalen Norm über das entsprechende Bauteil enthalten.
Für den Eignungsnachweis der Verbindungsteile wird die in diesem Dokument festgelegte Mindestanzahl an Proben einer Prüfung unterzogen, sofern in der entsprechenden Norm über die Verbindungsteile nichts anderes festgelegt ist oder zwischen Hersteller und Anwender vereinbart wurde.

Raccords de tubes métalliques pour transmissions hydrauliques et pneumatiques et applications générales - Méthodes d'essai pour raccords pour transmissions hydrauliques (ISO 19879:2021)

Kovinski cevni priključki za fluidno tehniko in splošno uporabo - Preskusne metode za hidravlične omrežne priključke (ISO 19879:2021)

General Information

Status
Published
Public Enquiry End Date
31-May-2019
Publication Date
28-Apr-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
08-Apr-2021
Due Date
13-Jun-2021
Completion Date
29-Apr-2021

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SLOVENSKI STANDARD
SIST EN ISO 19879:2021
01-junij-2021
Nadomešča:
SIST EN ISO 19879:2012
Kovinski cevni priključki za fluidno tehniko in splošno uporabo - Preskusne
metode za hidravlične omrežne priključke (ISO 19879:2021)

Metallic tube connections for fluid power and general use - Test methods for hydraulic

fluid power connections (ISO 19879:2021)
Metallische Rohrverschraubungen für Fluidtechnik und allgemeine Anwendung -
Prüfverfahren für hydraulische Rohrverschraubungen in der Fluidtechnik (ISO
19879:2021)
Raccords de tubes métalliques pour transmissions hydrauliques et pneumatiques et
applications générales - Méthodes d'essai pour raccords pour transmissions
hydrauliques (ISO 19879:2021)
Ta slovenski standard je istoveten z: EN ISO 19879:2021
ICS:
23.100.40 Cevna napeljava in sklopke Piping and couplings
SIST EN ISO 19879:2021 en,fr,de

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

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SIST EN ISO 19879:2021
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SIST EN ISO 19879:2021
EN ISO 19879
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2021
EUROPÄISCHE NORM
ICS 23.040.60; 23.100.40 Supersedes EN ISO 19879:2010
English Version
Metallic tube connections for fluid power and general use -
Test methods for hydraulic fluid power connections (ISO
19879:2021)

Raccords de tubes métalliques pour transmissions Metallische Rohrverschraubungen für Fluidtechnik

hydrauliques et pneumatiques et applications und allgemeine Anwendung - Prüfverfahren für

générales - Méthodes d'essai pour raccords pour hydraulische Rohrverschraubungen in der

transmissions hydrauliques (ISO 19879:2021) Fluidtechnik (ISO 19879:2021)
This European Standard was approved by CEN on 4 March 2021.

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

Poland, Portugal, Republic of North Macedonia, 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: Rue de la Science 23, B-1040 Brussels

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19879:2021 E

worldwide for CEN national Members.
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SIST EN ISO 19879:2021
EN ISO 19879:2021 (E)
Contents Page

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

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SIST EN ISO 19879:2021
EN ISO 19879:2021 (E)
European foreword

This document (EN ISO 19879:2021) has been prepared by Technical Committee ISO/TC 131 "Fluid

power systems" in collaboration with Technical Committee CEN/TC 459/SC 10 “Steel tubes, and iron

and steel fittings” the secretariat of which is held by UNI.

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 September 2021, and conflicting national standards

shall be withdrawn at the latest by September 2021.

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 ISO 19879:2010.

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, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
Endorsement notice

The text of ISO 19879:2021 has been approved by CEN as EN ISO 19879:2021 without any modification.

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SIST EN ISO 19879:2021
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SIST EN ISO 19879:2021
INTERNATIONAL ISO
STANDARD 19879
Third edition
2021-03
Metallic tube connections for fluid
power and general use — Test
methods for hydraulic fluid power
connections
Raccords de tubes métalliques pour transmissions hydrauliques et
pneumatiques et applications générales — Méthodes d'essai pour
raccords pour transmissions hydrauliques
Reference number
ISO 19879:2021(E)
ISO 2021
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SIST EN ISO 19879:2021
ISO 19879:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
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SIST EN ISO 19879:2021
ISO 19879:2021(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

Introduction ................................................................................................................................................................................................................................vi

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

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

3 Terms and definitions ..................................................................................................................................................................................... 1

4 General requirements ..................................................................................................................................................................................... 2

4.1 Test assemblies ....................................................................................................................................................................................... 2

4.2 Test equipment ....................................................................................................................................................................................... 5

4.2.1 Test block................................................................................................................................................................................ 5

4.2.2 Test seals ................................................................................................................................................................................. 5

4.3 Procedure .................................................................................................................................................................................................... 5

4.3.1 Thread lubrication ...................................................................... .................................................................................... 5

4.3.2 Torque ....................................................................................................................................................................................... 6

4.3.3 Temperature ........................................................................................................................................................................ 6

4.4 Test report ................................................................................................................................................................................................... 6

5 Repeated assembly test ................................................................................................................................................................................. 6

5.1 Principle ........................................................................................................................................................................................................ 6

5.2 Procedure .................................................................................................................................................................................................... 6

5.3 Re-use of components ...................................................................................................................................................................... 6

6 Leakage test ............................................................................................................................................................................................................... 7

6.1 Principle ........................................................................................................................................................................................................ 7

6.2 Procedure .................................................................................................................................................................................................... 7

6.3 Re-use of components ...................................................................................................................................................................... 7

7 Proof test ....................................................................................................................................................................................................................... 8

7.1 Principle ........................................................................................................................................................................................................ 8

7.2 Procedure .................................................................................................................................................................................................... 8

7.3 Re-use of components ...................................................................................................................................................................... 8

8 Burst test....................................................................................................................................................................................................................... 9

8.1 Principle ........................................................................................................................................................................................................ 9

8.2 Procedure .................................................................................................................................................................................................... 9

8.3 Re-use of components ...................................................................................................................................................................... 9

9 Cyclic endurance test ....................................................................................................................................................................................... 9

9.1 Principle ........................................................................................................................................................................................................ 9

9.2 Procedure .................................................................................................................................................................................................... 9

9.3 Re-use of components ...................................................................................................................................................................... 9

10 Vacuum test .............................................................................................................................................................................................................10

10.1 Principle .....................................................................................................................................................................................................10

10.2 Procedure .................................................................................................................................................................................................10

10.3 Re-use of components ...................................................................................................................................................................10

11 Overtightening test .........................................................................................................................................................................................10

11.1 Principle .....................................................................................................................................................................................................10

11.2 Test equipment ....................................................................................................................................................................................11

11.3 Procedure .................................................................................................................................................................................................11

11.4 Re-use of components ...................................................................................................................................................................11

12 Vibration test .........................................................................................................................................................................................................11

12.1 Principle .....................................................................................................................................................................................................11

12.2 Procedure .................................................................................................................................................................................................11

12.3 Re-use of components ...................................................................................................................................................................14

13 Cyclic endurance (impulse) test with vibration ................................................................................................................14

© ISO 2021 – All rights reserved iii
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SIST EN ISO 19879:2021
ISO 19879:2021(E)

13.1 Principle .....................................................................................................................................................................................................14

13.2 Procedure .................................................................................................................................................................................................14

13.3 Re-use of components ...................................................................................................................................................................15

14 Identification statement (Reference to this document) .................................................................................................15

Annex A (informative) Typical test data form ..........................................................................................................................................16

Bibliography .............................................................................................................................................................................................................................19

iv © ISO 2021 – All rights reserved
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SIST EN ISO 19879:2021
ISO 19879:2021(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 of 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 www .iso .org/

iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 131, Fluid power systems, Subcommittee

SC 4, Connectors and similar products and components, in collaboration with the European Committee for

Standardization (CEN) Technical Committee CEN/TC 459/SC 10, Steel tubes, and iron and steel fittings,

in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

This third edition cancels and replaces the second edition (ISO 19879:2010), which has been technically

revised.
The main changes compared to the previous edition are as follows:

— clarification of the language used to describe the connector end, and of the proper method for

selecting tubes for test assemblies;
— minor changes to 10.1, 10.2 (Table 7) and 12.2.2.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
© ISO 2021 – All rights reserved v
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SIST EN ISO 19879:2021
ISO 19879:2021(E)
Introduction

In hydraulic fluid power systems, power is transmitted and controlled through a liquid under pressure

within an enclosed circuit. It is suggested that components be designed to meet these requirements

under varying conditions. Testing of components to meet performance requirements provides a basis

of assurance for determining design application and for checking component conformance with the

stated requirements.
vi © ISO 2021 – All rights reserved
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SIST EN ISO 19879:2021
INTERNATIONAL STANDARD ISO 19879:2021(E)
Metallic tube connections for fluid power and general
use — Test methods for hydraulic fluid power connections
1 Scope

This document specifies uniform methods for the testing and performance evaluation of metallic tube

connections, stud ends for ports and flange connections for use in hydraulic fluid power applications.

This document does not apply to the testing of hydraulic quick-action couplings, which is covered by

ISO 18869.

Tests outlined in this document are independent of each other and document the method to follow

for each test. See the appropriate component International Standard for indications of which tests to

conduct and for performance criteria.

For qualification of the connector, the minimum number of samples specified in this document is tested,

unless otherwise specified in the relevant connector standard or as agreed upon by the manufacturer

and the user.
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 48-2, Rubber, vulcanized or thermoplastic — Determination of hardness — Part 2: Hardness between

10 IRHD and 100 IRHD
ISO 3448, Industrial liquid lubricants — ISO viscosity classification
ISO 3601-3, Fluid power systems — O-rings — Part 3: Quality acceptance criteria
ISO 5598, Fluid power systems and components — Vocabulary
ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method
ISO 6605, Hydraulic fluid power — Test methods for hoses and hose assemblies

ISO 6743-4, Lubricants, industrial oils and related products (class L) — Classification — Part 4: Family H

(Hydraulic systems)

ISO 10763, Hydraulic fluid power — Plain-end, seamless and welded precision steel tubes — Dimensions

and nominal working pressures
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 5598 apply.

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

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
© ISO 2021 – All rights reserved 1
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SIST EN ISO 19879:2021
ISO 19879:2021(E)
4 General requirements

WARNING — Some of the tests described in this document are considered hazardous. It is,

therefore, essential that, in conducting these tests, all appropriate safety precautions be strictly

adhered to. Attention is drawn to the danger of burst, fine jets (which can penetrate the skin)

and energy release of expanding gases. To reduce the hazard of energy release, bleed air out of

test specimens prior to pressure testing. Tests shall be set up and performed by properly trained

personnel, utilizing appropriate personal protective equipment (PPE).
4.1 Test assemblies

All components tested shall be in the final form, including annealed nuts, as required for brazed

components. Unless otherwise specified in the respective connector standard, Type 1 test assemblies

shall be as shown in Figure 1 for tube connections, and Type 2 test assemblies shall be as shown in

Figure 2 for male stud ends. Alternatively, in order to test the connector to its full capability, use of

the metallic tube may be omitted for burst and cyclic endurance tests, and different configurations

with similar capability may be combined in a test assembly Type 3, as shown in Figure 3. Type 4 test

assemblies for flange connectors shall be as shown in Figure 4. Test assemblies shall conform to the

relevant requirements given in Table 1.
Table 1 — Requirements for test assemblies
Part code Part name Description and further information
The type of stud end, tube-connector end and sealing method
A Straight stud connector
is optional but shall be recorded in the test report.
The required tube wall thickness shall be selected according
to the working pressure rating of the respective connec-
tor. The working pressure of the tube in accordance with
B Metallic tube
ISO 10763 shall be equal to or slightly greater than the work-
ing pressure of the respective connector. The length of the
tube shall be five times the tube outside diameter plus 50 mm.
Shaped connector, with
C —
swivel, if applicable
D Blanking end (cap or plug) —
Shaped connector with
E —
adjustable stud end
F Flange connector —
G Sealing e.g. O-ring.
2 © ISO 2021 – All rights reserved
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SIST EN ISO 19879:2021
ISO 19879:2021(E)
Key
1 swivel nut
2 tube nut
3 straight stud connector
4 metallic tube
5 shaped connector
6 blanking end (cap or plug)
7 sealing, e.g. O-ring
L = 5 × the tube OD (in millimetres) + 50 mm.
Figure 1 — Typical test assembly for tube connection — Type 1
a) Non-adjustable stud end connection b) Adjustable stud end connection, with
shaped connector, if applicable
Key
1 straight stud connector
2 blanking end (cap or plug)
3 shaped connector with adjustable stud end
4 sealing, e.g. O-ring
Figure 2 — Typical test assembly for stud end — Type 2
© ISO 2021 – All rights reserved 3
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SIST EN ISO 19879:2021
ISO 19879:2021(E)
Key
1 swivel nut
2 shaped connector with swivel
3 blanking end (cap or plug)
4 shaped connector with adjustable stud end
5 sealing, e.g. O-ring
Figure 3 — Typical test assembly without tube — Type 3
4 © ISO 2021 – All rights reserved
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SIST EN ISO 19879:2021
ISO 19879:2021(E)
Key
1 flange connector
2 Sealing, e.g. O-ring
3 split-flange clamp
4 screw
5 washer
6 test block
This end capped or plugged.
Figure 4 — Typical test assembly for flange connectors — Type 4
4.2 Test equipment
4.2.1 Test block

Test blocks shall be unplated and have a minimum hardness of 35 HRC in accordance with ISO 6508-1.

For a test block with multiple ports, the distance between the centrelines of test ports shall be a

minimum of 1,5 times the port diameter. The distance between the port centreline and the edge of the

test block shall be a minimum of 1 times the port diameter.
4.2.2 Test seals

For all tests, except for the overtightening test and unless otherwise specified, seals shall be nitrile

(NBR) rubber with a hardness of (90 ± 5) IHRD when measured in accordance with ISO 48-2. Seals shall

conform to their respective dimensional requirements, and O-rings shall meet or exceed the quality

requirements for grade N (general purpose) of ISO 3601-3, if applicable.
4.3 Procedure
4.3.1 Thread lubrication

For all tests, on connectors made of carbon steel and for testing only, threads and contact surfaces

shall be lubricated prior to application of torque using a hydraulic fluid with a viscosity of ISO VG 32 in

© ISO 2021 – All rights reserved 5
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SIST EN ISO 19879:2021
ISO 19879:2021(E)

accordance with ISO 3448. For connectors made of materials other than carbon steel, the manufacturer's

recommendation for thread lubrication shall be followed.
4.3.2 Torque

For all tests, except the repeated assembly and overtightening tests, tube connections and stud ends

shall be tested at the required minimum torques or number of hex flats or turns from finger-tight

position given in the respective connector standard, if specified. Otherwise, they shall be tested at

the minimum torque values or number of hex flats or turns from finger-tight position supplied by the

manufacturer. For test assembly, type 2 and type 3 adjustable stud torques shall be applied after being

backed out one full turn from finger-tight, in order to test correctly the worst possible actual assembly

conditions.
4.3.3 Temperature

For all tests, the temperature of the hydraulic fluid shall be between 15 °C and 80 °C, unless otherwise

specified in the respective connector standard.
4.4 Test report
Test results and test conditions shall be reported.
NOTE ISO/
...

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