ISO INTERNATIONAL STANDARD 7186 Third edition 2011-07-15 Ductile iron products for sewerage applications Produits en fonte ductile pour I'assainissement Reference number ISO 7186:2011(E) @ ISO 2011 vided by IHS under lic Not for Resale ISO 7186:2011(E) COPYRIGHTPROTECTEDDOCUMENT @ ISO2011 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, 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 @ ISO 2011 - All rights reserved etworking permitted without license from IHS Not for Resale ISO 7186:2011(E) Contents Page Foreword .iv 1 Scope 2 Normative references. 3 Terms and definitions . 4 Technical requirements 4.1 General 4.2 Pressure classification 4.3 Dimensional requirements . 4.4 Material characteristics. 13 4.5 Coatings and linings for pipes... 14 4.6 Coatings for fittings and accessories . 14 4.7 Systems design requirements ..... 4.8 Leaktightness of pipeline components. 15 4.9 15 5 Performance requirements. 16 5.1 Leaktightness of joints 5.2 Diametral stiffness . 17 5.3 Chemical resistance ... 18 5.4 Abrasion resistance . 18 6 Test methods andtestfrequencies. 18 6.1 6.2 Straightness of pipes. .19 6.3 Tensile test.. 19 6.4 Brinell hardness. 21 6.5 Works leaktightness test of pipes and fittings for pressure applications 21 6.6 Works leaktightness test of pipes and fittings for vacuum applications .. 22 7 Type tests.... 22 7.1 Leaktightness of gravity pipeline components. 22 7.2 Leaktightness of joints to internal pressure.... 7.3 Leaktightnessofjointstoexternalpressure. 23 7.4 Leaktightness of joints to negative internal pressure... 24 7.5 Diametral stiffness of pipe..... 7.6 Chemical resistance to effluents 7.7 Abrasion resistance .... 27 8 Tablesofdimensions. .28 8.1 Socket and spigot pipes .. 28 8.2 Fittings for gravity appiications..... 8.3 Fittings for pressure and vacuum applications . ..32 Annex A (informative) External protection.. ..33 Annex B (informative) Internal protection ..... Annex C (normative) Allowable pressure for pressure sewers Bibliography.... CopyrightInenationalOanzaandardizaoghtsreserved ili ted without license from IHS Not for Resale