Aerospace — Fluid systems — Vocabulary — Part 2: General terms and definitions relating to flow

ISO 8625-2:2018 defines general terms relating to flow in fluid systems used in aerospace construction.

Aéronautique et espace — Systèmes de fluides — Vocabulaire — Partie 2: Termes généraux et définitions relatifs à l'écoulement

General Information

Status
Published
Publication Date
18-Mar-2018
Current Stage
6060 - International Standard published
Start Date
19-Mar-2018
Completion Date
19-Mar-2018
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ISO 8625-2:2018 - Aerospace -- Fluid systems -- Vocabulary
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INTERNATIONAL ISO
STANDARD 8625-2
Second edition
2018-03
Aerospace — Fluid systems —
Vocabulary —
Part 2:
General terms and definitions
relating to flow
Aéronautique et espace — Systèmes de fluides — Vocabulaire —
Partie 2: Termes généraux et définitions relatifs à l'écoulement
Reference number
ISO 8625-2:2018(E)
ISO 2018
---------------------- Page: 1 ----------------------
ISO 8625-2:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

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
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Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
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ISO 8625-2:2018(E)
Contents Page

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

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

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

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

© ISO 2018 – All rights reserved iii
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ISO 8625-2:2018(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: www .iso .org/ iso/ foreword .html.

This document was prepared by ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 10, Aerospace

fluid systems and components.

This second edition cancels and replaces the first edition (ISO 8625-2:1991), which has been technically

revised.
The main changes compared to the previous edition are as follows:
— Clause 2 has been added, moving the “Terms and definitions” to Clause 3;
— Clause 3 has been technically revised and editorially reworked;
— the example for a definition at the beginning of Clause 3 has been deleted;
— the definitions in Clause 3 have been renumbered accordingly;

— the definitions for “laminar flow” and “turbulent flow” have been added as a sub-entry to the

definition of “flow”;
— “flow factor” and “flow coefficient” have been combined under sub clause 3.4;

— “quiescent flow” and “seal leakage/seepage” have been moved as sub-entries to 3.7 (“leakage”);

— the definition for “Reynolds number” has been added to Clause 3 as sub-entry 3.10;

— the definition for “weepage” has been deleted; and
— the “Alphabetical Index” has been deleted.
A list of all parts in the ISO 8625 series can be found on the ISO website.
iv © ISO 2018 – All rights reserved
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INTERNATIONAL STANDARD ISO 8625-2:2018(E)
Aerospace — Fluid systems — Vocabulary —
Part 2:
Gene
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