ISO 19631:2015
(Main)Aerospace series — Tube fittings for fluid systems, 5 080 psi (35 000 kPa) — Qualification specification
Aerospace series — Tube fittings for fluid systems, 5 080 psi (35 000 kPa) — Qualification specification
ISO 19631:2015 specifies performance and quality requirements for the qualification and manufacture of standard tube fittings to ensure reliable performance in aircraft hydraulic 5 080 psi (35 000 kPa) systems. ISO 19631:2015 specifies baseline criteria for the design and manufacture of system fittings that are qualification tested on engines. ISO 19631:2015 covers fittings from size ?04 to ?20 used for the following: ? separable/permanent pipe end fittings; ? permanent connection fittings; ? separable connection fittings. ISO 19631:2015 covers fittings of the temperature types and pressure classes specified in ISO 6771.
Série aérospatiale — Raccordements de tubes pour les systèmes fluides, 5 080 psi (35 000 kPa) — Spécification de qualification
General Information
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 19631
First edition
2015-09-01
Aerospace series — Tube fittings for
fluid systems, 5 080 psi (35 000 kPa)
— Qualification specification
Série aérospatiale — Raccordements de tubes pour les systèmes
fluides, 5 080 psi (35 000 kPa) — Spécification de qualification
Reference number
©
ISO 2015
© ISO 2015, Published in Switzerland
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ii © ISO 2015 – All rights reserved
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Requirements . 1
3.1 Qualification . 1
3.1.1 Manufacturer qualification . 1
3.1.2 Product qualification . 2
3.2 Materials . 2
3.2.1 Fittings . 2
3.2.2 Tubing . 2
3.2.3 Testfluid . 2
3.3 Environmental conditions . 3
3.3.1 Pressures . 3
3.3.2 Temperature . 3
3.4 Design and manufacture . 3
3.4.1 Fluid passages . 3
3.5 Performance . 3
3.5.1 Specimen preparation . 3
3.5.2 Proof pressure . 4
3.5.3 Gaseous pressure. 4
3.5.4 Hydraulic impulse resistance . 4
3.5.5 Ultimate pressure . 5
3.5.6 Flexure fatigue resistance . 5
3.5.7 Re-use capability . 5
3.5.8 Tensile load capability . . 6
3.5.9 Thermal shock . 6
3.5.10 Over-tightening . 6
3.5.11 Electrical conductivity . 6
3.5.12 Salt spray . 7
3.5.13 Vibration . 7
3.5.14 Fire test .11
3.5.15 System pressure test .11
3.5.16 Fuel ageing .12
3.5.17 Hydraulic fluid ageing .12
3.5.18 Tube twisting .12
3.5.19 Fitting/tube rotation torque .13
3.5.20 Stress corrosion .14
3.5.21 Lightning strike .16
Annex A (normative) Equivalent materials and processes .18
Bibliography .20
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 20, Aircraft and space vehicles, Subcommittee
SC 10, Aerospace fluid systems and components.
iv © ISO 2015 – All rights reserved
Introduction
This International Standard establishes the basic performance for 5 080 psi (35 000 kPa) tube fitting
assemblies used in aerospace fluid systems.
The test requirements are intended to satisfy the most strenuous demands encountered in a high-
performance aircraft hydraulic system.
International Standards use the International System of units (SI); however, large segments of the
aerospace industry make use of other measurement systems as a matter of common working practice.
All dimensions and units used in this International Standard are given in SI units, with other units also
indicated for the convenience of the user.
The decimal sign used in International Standards is the comma (“,”); however, the comma is not used in
common working practice with non-SI dimensions. Therefore, in common with many other aerospace
standards, the decimal point (“.”) is used in this International Standard when providing dimensions in
inch-pound units.
NOTE The use of non-SI units and the decimal point in this International Standard does not constitute
general acceptance of measurement systems other than SI within International Standards.
INTERNATIONAL STANDARD ISO 19631:2015(E)
Aerospace series — Tube fittings for fluid systems, 5 080
psi (35 000 kPa) — Qualification specification
1 Scope
This International Standard specifies performance and quality requirements for the qualification and
manufacture of standard tube fittings to ensure reliable performance in aircraft hydraulic 5 080 psi
(35 000 kPa) systems.
This International Standard specifies baseline criteria for the design and manufacture of system
fittings that are qualification tested on engines.
This International Standard covers fittings from size –04 to –20 used for the following:
— separable/permanent pipe end fittings;
— permanent connection fittings;
— separable connection fittings.
This International Standard covers fittings of the temperature types and pressure classes specified in
ISO 6771.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 2685, Aircraft — Environmental test procedure for airborne equipment — Resistance to fire in
designated fire zones
ISO 6772, Aerospace — Fluid systems — Impulse testing of hydraulic hose, tubing and fitting assemblies
ISO 6773, Aerospace — Fluid systems — Thermal shock testing of piping and fittings
ISO 7137, Aircraft — Environmental conditions and test procedures for airborne equipment
ISO 7257, Aircraft — Hydraulic tubing joints and fittings — Rotary flexure test
ISO 10583:1993, Aerospace fluid systems — Test methods for tube/fitting assemblies
EUROCAE ED-14E/RTCA DO-160E, Section 22, Lightning Induced transient Susceptibility
3 Requirements
3.1 Qualification
Fittings claiming conformity with this International Standard shall be representative of products,
which have successfully met the requirements and have passed the tests in this International Standard.
3.1.1 Manufacturer qualification
Manufacturer approval shall be granted by purchaser qualification procedure.
Outside agency procedure can be used if no specific procedure exists (see Annex A, Table A.3,
Procedure 1).
3.1.2 Product qualification
Product approval shall be granted by purchaser qualification pr
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