SIST EN ISO 19879:2005

SLOVENSKI STANDARD
SIST EN ISO 19879:2005
01-oktober-2005
.RYLQVNLFHYQLSULNOMXþNL]DIOXLGQRWHKQLNRLQVSORãQRXSRUDER±3UHVNXVQH
PHWRGH]DKLGUDYOLþQHRPUHåQHSULNOMXþNH,62
Metallic tube connections for fluid power and general use - Test methods for hydraulic
fluid power connections (ISO 19879:2005)
Metallische Rohrverschraubungen für Fluidtechnik und allgemeine Anwendung -
Prüfverfahren für hydraulische Rohrverschraubungen in der Fluidtechnik (ISO
19879:2005)
Raccords de tubes métalliques pour transmissions hydrauliques et pneumatiques et
applications générales - Méthodes d'essai pour raccords pour transmissions
hydrauliques (ISO 19879:2005)
Ta slovenski standard je istoveten z: EN ISO 19879:2005
ICS:
23.100.40 Cevna napeljava in sklopke Piping and couplings
SIST EN ISO 19879:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST EN ISO 19879:2005

---------------------- Page: 2 ----------------------

SIST EN ISO 19879:2005
EUROPEAN STANDARD
EN ISO 19879
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2005
ICS 23.040.60; 23.100.40

English Version
Metallic tube connections for fluid power and general use - Test
methods for hydraulic fluid power connections (ISO 19879:2005)
Raccords de tubes métalliques pour transmissions Metallische Rohrverschraubungen für Fluidtechnik und
hydrauliques et pneumatiques et applications générales - allgemeine Anwendung - Prüfverfahren für hydraulische
Méthodes d'essai pour raccords pour transmissions Rohrverschraubungen in der Fluidtechnik (ISO 19879:2005)
hydrauliques (ISO 19879:2005)
This European Standard was approved by CEN on 31 July 2005.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19879:2005: E
worldwide for CEN national Members.

---------------------- Page: 3 ----------------------

SIST EN ISO 19879:2005

EN ISO 19879:2005 (E)





Foreword


This document (EN ISO 19879:2005) has been prepared by Technical Committee ISO/TC 131
"Fluid power systems" in collaboration with Technical Committee ECISS/TC 29 "Steel tubes and
fittings for steel tubes", 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 February 2006, and conflicting national
standards shall be withdrawn at the latest by February 2006.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.


Endorsement notice

The text of ISO 19879:2005 has been approved by CEN as EN ISO 19879:2005 without any
modifications.

2

---------------------- Page: 4 ----------------------

SIST EN ISO 19879:2005

INTERNATIONAL ISO
STANDARD 19879
First edition
2005-08-01


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 19879:2005(E)
©
ISO 2005

---------------------- Page: 5 ----------------------

SIST EN ISO 19879:2005
ISO 19879:2005(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.


© ISO 2005
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland

ii © ISO 2005 – All rights reserved

---------------------- Page: 6 ----------------------

SIST EN ISO 19879:2005
ISO 19879:2005(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope. 1
2 Normative references. 1
3 Terms and definitions. 1
4 General requirements. 2
5 Repeated assembly test. 6
6 Leakage test. 6
7 Proof test. 7
8 Burst test. 8
9 Cyclic endurance test. 9
10 Vacuum test. 10
11 Overtightening test. 11
12 Vibration test. 11
13 Cyclic endurance (impulse) test with vibration.14
14 Identification statement (reference to this International Standard) . 15
Annex A (normative) Test data form . 16
Bibliography . 19

© ISO 2005 – All rights reserved iii

---------------------- Page: 7 ----------------------

SIST EN ISO 19879:2005
ISO 19879:2005(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 19879 was prepared by Technical Committee ISO/TC 131, Fluid power systems, Subcommittee SC 4,
Connectors and similar products and components.
This first edition of ISO 19879 cancels and replaces ISO 8434-5:1995, which has been technically revised.

iv © ISO 2005 – All rights reserved

---------------------- Page: 8 ----------------------

SIST EN ISO 19879:2005
ISO 19879:2005(E)
Introduction
In hydraulic fluid power systems, power is transmitted and controlled through a liquid under pressure within an
enclosed circuit. Components must 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 compliance with the stated requirements.

© ISO 2005 – All rights reserved v

---------------------- Page: 9 ----------------------

SIST EN ISO 19879:2005

---------------------- Page: 10 ----------------------

SIST EN ISO 19879:2005
INTERNATIONAL STANDARD ISO 19879:2005(E)

Metallic tube connections for fluid power and general use —
Test methods for hydraulic fluid power connections
1 Scope
This International Standard 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
International Standard does not apply to the testing of hydraulic quick-action couplings, which is covered by
ISO 7241-2.
Tests outlined in this International Standard are independent of each other and document the method to follow
for each test. See the appropriate component International Standard for which tests to conduct and for
performance criteria.
For qualification of the connector, the minimum number of samples specified in this International Standard are
tested, unless otherwise specified in the relevant connector standard or as agreed upon by the manufacturer
and the user.
2 Normative references
The following referenced documents are indispensable for the application 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, Rubber, vulcanized or thermoplastic — Determination of hardness (hardness between 10 IRHD and
100 IRHD)
ISO 3448, Industrial liquid lubricants — ISO viscosity classification
1)
ISO 3601-3, Fluid power systems — O-rings — Part 3: Quality acceptance criteria
1)
ISO 5598, Fluid power systems and components — Vocabulary
ISO 6508 (all parts), Metallic materials — Rockwell hardness test
ISO 6605, Hydraulic fluid power — Hoses and hose assemblies — Test methods
ISO 6743-4, Lubricants, industrial oils and related products (class L) — Classification — Part 4: Family H
(Hydraulic systems)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 5598 apply.

1) Under revision.
© ISO 2005 – All rights reserved 1

---------------------- Page: 11 ----------------------

SIST EN ISO 19879:2005
ISO 19879:2005(E)
4 General requirements
WARNING — Some of the tests described in this International Standard 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.
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 (for repeated assembly, leakage, proof, burst and cyclic endurance tests), and
Type 2 test assemblies shall be as shown in Figure 2 for male stud ends (for leakage, proof and, if specified,
burst and cyclic endurance tests). 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, connector end and sealing method is optional
A Straight stud connector
but shall be recorded in the test report.
The required tube wall thickness shall be selected according to the
B Metallic tube working pressure rating of the respective connector. The length of
the tube shall be five times the tube outside diameter plus 50 mm.
Shaped connector, with swivel,
C –––
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 2005 – All rights reserved

---------------------- Page: 12 ----------------------

SIST EN ISO 19879:2005
ISO 19879:2005(E)

Key
1 swivel nut
A straight stud connector
B metallic tube
C shaped connector
D blanking end (cap or plug)
G sealing, e.g. O-ring

a
L = 5 × the tube OD (in millimetres) + 50 mm.
Figure 1 — Test assembly for tube connection — Type 1


a) Non-adjustable stud end connection b) Adjustable stud end connection, with shaped
connector, if applicable
Key
A straight stud connector
D blanking end (cap or plug)
E shaped connector with adjustable stud end
G sealing, e.g. O-ring
Figure 2 — Test assembly for stud end — Type 2
© ISO 2005 – All rights reserved 3

---------------------- Page: 13 ----------------------

SIST EN ISO 19879:2005
ISO 19879:2005(E)

Key
1 swivel nut
C shaped connector with swivel
D blanking end (cap or plug)
E shaped connector with adjustable stud end
G sealing, e.g. O-ring
Figure 3 — Alternate connector capability test assembly without tube — Type 3

Key
1 O-ring seal
2 split-flange clamp
3 screw
4 washer
5 test adapter
F flange connector
a
This end capped or plugged.
Figure 4 — Test assembly for flange connectors — Type 4
4 © ISO 2005 – All rights reserved

---------------------- Page: 14 ----------------------

SIST EN ISO 19879:2005
ISO 19879:2005(E)
4.2 Test equipment
4.2.1 Test block
Test blocks shall be unplated and have a hardness between 35 HRC and 45 HRC in accordance with
ISO 6508. 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. 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 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 on the test data form given in Annex A.
NOTE ISO/TR 11340 provides a method of reporting leakage.
© ISO 2005 – All rights reserved 5

---------------------- Page: 15 ----------------------

SIST EN ISO 19879:2005
ISO 19879:2005(E)
5 Repeated assembly test
5.1 Principle
Unless otherwise specified in the respective connector standard, three Type 1 test assemblies shall be tested
to confirm that they are capable of meeting the necessary requirements after being disassembled and
re-assembled several times.
5.2 Procedure
The tube connections of the straight stud connector (part A in Figure 1) and shaped connector (part C in
Figure 1) shall be disassembled and re-assembled six times. Prior to each re-assembly, the tube shall be
turned clockwise by 60°. On re-assembly, the nuts shall be tightened firmly, using the maximum torque values
or number of turns given in the respective connector standard or by the manufacturer. All assemblies, after the
first and sixth re-assembly, shall be subjected to a leakage test (Clause 6) and a proof test (Clause 7) at the
test parameters specified in Table 2.
5.3 Re-use of components
Parts that pass this test may be used for burst and cycle endurance tests at the minimum specified assembly
torque or number of turns. They shall not be used for actual service or returned to stock.
Table 2 — Parameters and procedure for repeated assembly test
Test parameter Value of parameter and procedure
Test medium
As specified in Clauses 6 and 7.
Test pressure
Test duration
Any leakage during the leakage and proof tests shall be
Pass/fail criterion
considered a failure.

6 Leakage test
6.1 Principle
Unless otherwise specified in the respective connector standard, all Type 1 test assemblies from the repeated
assembly test and three each of Type 2, Type 3 and Type 4 assemblies (where applicable) shall be subjected
to a leakage test to ensure that assemblies do not leak when subjected to test pressure.
6.2 Procedure
Test assemblies shall be pressurized under water as shown in Figure 5 and described in Table 3.
6.3 Re-use of components
Parts that pass this test may be used for further tests. They shall not be used for actual service or returned to
stock.
6 © ISO 2005 – All rights reserved

---------------------- Page: 16 ----------------------

SIST EN ISO 19879:2005
ISO 19879:2005(E)

Key
1 test fluid inlet
2 water
Figure 5 — Typical test set-up for leakage test
Table 3 —
...