ISO INTERNATIONAL STANDARD 14903 Second edition 2017-07 Refrigerating systems and heat pumps - Qualification of tightness of components and joints Systemes de réfrigération et pompes a chaleurQualification de I'étanchéité des composants et des joints Reference number IS0 14903:2017(E) International Organization for Standardization @ IS0 2017 =ZHEJIANG INST OF STANDARDIZATION C1 5956617 IS0 14903:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2017, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISOcopyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org Internatinair PrganizationforStandardization icensee-ZHEJIANG INSTOF STANDARDIZAoISQ07 -All rights reserved Not for Resale, 2017/9/11 05:27:16 etworking permitted without license from IHS IS0 14903:2017(E) Contents Page Foreword ..iv 1 Scope .1 2 Normative references 3 Terms and definitions 4 Symbols. 5 Test requirements 6 Requirements for hermetically sealed systems ..8 7 Test procedures 7.1 General ..8 7.2 Sampling. 7.3 Test temperature .8 7.4 Tightness test. 7.4.1 General ..8 7.4.2 Tightness level control 7.5 Requirements for joints.. .11 7.5.1 Test samples. 11 7.5.2 Torque. .11 7.5.3 Reusable joint. .12 7.5.4 Requirements for hermetically sealed joints ..12 7.6 Pressure-temperature vibration tests (PTV) .12 7.6.1 General 12 7.6.2 Samples. ..12 7.6.3 Testmethod ..12 7.6.4 Method 1: Combined pressure-temperature cycle test with integrated vibrationtest ..13 7.6.5 Method 2: Combined pressure-temperature cycle test with a separate vibrationtest ..15 7.7 Operation simulation. .20 7.8 Freezingtest 20 7.9 Additional pressuretestfor hermetically-sealed joints 21 7.10 Vacuum test. 21 7.11 Compatibility screening test 22 7.11.1 General .22 7.11.2 Test fluids. 22 7.11.3 Test specimens. 22 7.11.4 Test setup parameters 22 7.11.5 Test procedure. .23 7.11.6 Pass/fail criteria for sealing elements .23 7.12 Fatigue test for hermetically sealed joints 24 8 Test report .25 9 Information to the user .25 Annex A (informative) Equivalent tightness control levels ..26 Annex B (normative) Test arrangements ..32 Bibliography .34 iii ee=ZHEJIANG INSTOFSTANDARDIZATION C15956617 ed without license from IHS Not for Resale, 2017/9/11 05:27:16