ISO INTERNATIONAL STANDARD 6358-1 First edition 2013-05-15 Pneumatic fluid power - Determination of flow-rate characteristics of components using compressible fluids - Part 1: General rules and test methods for steady-state flow Transmissions pneumatiques - Determination des caractéristiques de debit des composants traversés par un fluide compressible - Partie 1: Regles genérales et méthodes d'essai en régime stationnaire Reference number IS0 6358-1:2013(E) ISO Copyright International Organization for Standardization @ IS0 2013 ed without license from IHS Not for Resale IS0 6358-1:2013(E) COPYRIGHTPROTECTEDDOCUMENT @IS02013 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 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 @ IS0 2013 - All rights reserved or networking permited without license from IHS Not for Resale IS0 6358-1:2013(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. .1 2 Normative references 3 Terms and definitions .2 3.1 Terms and definitions related to pressures .2 3.2 Terms and definitions related to temperature .2 3.3 Terms and definitions related to flow. 3 3.4 Terms and definitions related to flow-rate characteristics .3 3.5 Miscellaneous terms and definitions 4 4 Symbols and units .4 5 Test installation. .5 5.1 Test circuit for constant upstream pressure test .5 5.2 Test circuit for variable upstream pressure test. 6 5.3 General requirements 5.4 Pressure-measuring tubes (items 6 and 10) .7 5.5 Transition connectors (items 7 and 9) .9 5.6 Special requirements 12 6 Test procedures .13 6.1 Test conditions .13 6.2 Measuring procedures .14 6.3 Calculation of characteristics ..16 7 Presentation of test results .18 8 Identification statement (reference to this part of Is0 6358) ..19 Annex A (normative) Alternative test procedure ..20 Annex B (informative) Flowmeter calibration .23 Annex C (informative) Evaluation of measurement uncertainty ..25 Annex D (informative) Observations on error in test results ..30 Annex E (informative) Equations and graphical representations of flow-rate characteristics. ...1. Annex F (informative) Use of practical units .46 Annex G (informative) Results of testing performed on commercially available pneumatic components. .47 Annex H (informative) Procedures for calculating critical back-pressure ratio, b, and subsonic index, m, by the least-square method using the Solver function in Microsoft Excel ..57 Bibliography .61 ii ed without license from IHS Not for Resale