ISO INTERNATIONAL STANDARD 4144 Second edition 2003-03-15 Pipework Stainless steel fittings threaded in accordance with IsO 7-1 Tuyauteries Raccords en acier inoxydable, filetés conformément a I'ISO 7-1 Reference number ISO 4144:2003(E) ISO @ ISO 2003 by IHS under lic itted without license from IHS Not for Resale ISO 4144:2003(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The IsO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below ISO2003 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 [email protected] Web www.iso.org Published in Switzerland @ ISo 2003 - All rights reserved py IHS unde ermittedwithoutlicense from IHS Not for Resale ISO 4144:2003(E) Contents Page Foreword. .iv Introduction 1 Scope. 2 Normative references ... 3 Types of fittings and their symbols 2 4 Pressure-temperature ratings.. 3 5 Manufacturing and materials 6 Threads ...... 6.1 Choice of thread.. 6.2 Chamfering .... 7 Dimensions.. 7.1 General........ 7.2 Dimensionsofjoints. 7.3 Elbows E1,tees T1 and crosses X1 7.4 Reducing elbows E2 and reducing tees T2, .6 7.5 45° elbows E3..... 7.6 Male and female elbows E4... 8 7.7 Half sockets S1.. 9 7.8 10 7.9 Reducing sockets S3 .. 11 7.10 Reducing bushes B1. 12 7.11 Hexagon nipples N1.... 13 7.12 Reducing nipples N2... 7.13 Caps C1.. .15 7.14 Plugs P1 and P2 , 16 7.15 Unions with flat seat U1, U2 and U3 and unions with taper seat U4, U5 and U6... 17 8 Tests and inspections .... .18 9 Marking.. 18 10 Designation 18 Copyright International Organizaion for Standardization rights reserved ii ted without license from IHS Not for Resale ISO 4144:2003(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 non-governmental, in liaison with isO, also take part in the work. so collaborates closely with the InternationalElectrotechnicalCommission(iEC)onallmattersofelectrotechnicalstandardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. rights. IsO shall not be held responsible for identifying any or all such patent rights. ISsO 4144 was prepared by Technical Committee ISO/TC 5, Ferrous metal pipes and metallic fittings, Subcommittee Sc 5, Threaded or plain end butt-welding fittings, threads, gauging of threads. Thissecondeditioncancelsandreplacesthefirstedition(lsO4144:1979),whichhasbeentechnicallyrevised @ISO2003-Allrightsreserved onal Organization for Standardizatior