ISO/TS TECHNICAL SPECIFICATION 12512 First edition 2017-07 Glass reinforced thermosetting plastic (GRP) pipes Determination of initial specific ring stiffness using segment test species cut from a pipe Tubes en plastique thermodurcissables renforces de verre (PRV) Détermination de la rigidité annulaire spécifique initiale et de la résistance a la déflexion annulaire initiale en utilisant des éprouvettes segmentaires découpées dans un tube Reference number IS0/TS12512:2017(E) International Organization for Standardization ZHEJIANG INST OF STANDARDIZATION C1 5956617 @IS02017 ed without license from IHS IS0/TS 12512:2017(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 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 Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org Internationai ibrg DrganizationforStandardization Licensee-ZHEJIANG INST.OF STANDARDIZzRoISQ7 - All rights reserved networking permited without license from IHS IS0/TS 12512:2017(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references 3 Terms and definitions 4 Principle 4.1 Overview 4 4.2 Principle of test procedures to determine initial specific ring stiffness ..4 4.2.1 Method A .4 4.2.2 Method B. 5 Apparatus ..4 5.2 Load application surface - General arrangement. ..5 5.3 Dimension-measuring instruments ..5 5.4 Temperature-measuring instrument. .5 6 Test pieces. .6 6.1 Preparation ..6 6.2 Number. .6 6.3 Determination of dimensions ..6 6.3.1 Width .6 6.3.2 Wall thickness .7 6.3.3 Meandiameter 7 7 Conditioning .7 8 Procedure ..7 8.1 Test temperature. .7 8.2 Positioning of the test piece ..7 8.3 Determination of initial specific ring stiffness .7 8.3.1 Method A: Using constant load. 8.3.2 Method B: Using constant deflection. .10 9 .11 Calculations. 10 Test report. ..12 Annex A (informative) Principles forming basis for use of segmental test pieces ..13 ii Licensee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 vided by IHS under lic se with ISt without license from IHS