1、BRITISH STANDARDBS EN 10226-2:2005Pipe threads where pressure tight joints are made on the threads Part 2: Taper, external threads and taper internal threads Dimensions, tolerances and designationThe European Standard EN 10226-2:2005 has the status of a British StandardICS 21.040.30g49g50g3g38g50g51
2、g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Licensed Copy: Wang Bin, na, Fri Apr 14 08:08:51 BST 2006, Uncontrolled Copy, (c) BSIBS EN 10226-2:2005This British S
3、tandard was published under the authority of the Standards Policy and Strategy Committee on 16 January 2006 BSI 16 January 2006ISBN 0 580 47506 9National forewordThis British Standard is the official English language version of EN 10226-2:2005. The UK participation in its preparation was entrusted t
4、o Technical Committee ISE/19, Pipe fittings (other than cast iron), which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor
5、 related international and European developments and promulgate them in the UK.A list of organizations represented on this committee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document m
6、ay be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users
7、are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 13 and a back cover.The BSI copyright notice displayed
8、 in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsLicensed Copy: Wang Bin, na, Fri Apr 14 08:08:51 BST 2006, Uncontrolled Copy, (c) BSIEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 10226-2August 2005ICS 21.040.30English Version
9、Pipe threads where pressure tight joints are made on thethreads - Part 2: Taper external threads and taper internalthreads - Dimensions, tolerances and designationFiletages de tuyauterie pour raccordement avec tanchitdans le filet - Partie 2: Filetages extrieurs coniques etfiletages intrieurs coniqu
10、es - Dimensions, tolrances etdsignationRohrgewinde fr im Gewinde dichtende Verbindungen - Teil2: Kegelige Auengewinde und kegelige Innengewinde -Mae, Toleranzen und BezeichnungThis European Standard was approved by CEN on 27 June 2005.CEN members are bound to comply with the CEN/CENELEC Internal Reg
11、ulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This Eur
12、opean Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the nation
13、al standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN
14、 COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 10226-2:2005: ELicensed Copy: Wang
15、Bin, na, Fri Apr 14 08:08:51 BST 2006, Uncontrolled Copy, (c) BSIEN 10226-2:2005 (E) 2 Contents Page Foreword 3 1 Scope .4 2 Normative references .4 3 Terms and definitions.4 4 Symbols and explanations.6 5 Dimensions6 6 Designation .6 7 Thread design .8 7.1 Thread form.8 7.2 Thread lengths 9 8 Gaugi
16、ng .11 Bibliography.13 Licensed Copy: Wang Bin, na, Fri Apr 14 08:08:51 BST 2006, Uncontrolled Copy, (c) BSIEN 10226-2:2005 (E) 3 Foreword This document (EN 10226-2:2005) has been prepared by Technical Committee ECISS/TC 29 “Steel tubes and fittings for steel tubes”, the secretariat of which is held
17、 by UNI/UNSIDER. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2006, and conflicting national standards shall be withdrawn at the latest by February 2006. This document has been prepare
18、d under a mandate given to CEN by the European Commission and the European Free Trade Association. This document is based, with editorial modifications on ISO 7-1 “Pipe threads where pressure-tight joints are made on the threads - Part 1: Dimensions, tolerances and designation“. Pipe threads to this
19、 document are dimensionally identical to and fully interchangeable with pipe threads to ISO 7-1. This document has been prepared in three parts. Parts 1 and 2 reflect the two thread jointing systems in regular use in Europe and Worldwide - Part 1 details taper external and parallel internal pipe thr
20、eads, and Part 2 details taper external and taper internal pipe threads. Part 3 will provide requirements for the gauging of pipe threads conforming to Parts 1 and 2. The common requirements for the taper external pipe thread are given in Part 1 and in Part 2, so as to present the complete thread jo
21、inting system in each part. Components having pipe threads produced to the dimensions and tolerances given in this European Standard can be assembled to give safe and effective pressure tight joints providing proper assembly techniques are used. The techniques used to assemble threaded joints are de
22、pendent on a number of factors including the internal thread (parallel or taper), the quality of the mating threads, the materials of the components being connected, the thread sealant or jointing compound used and the assembly torque. Because of the different assembly techniques used for the taper
23、/ parallel and taper / taper systems, it is recommended that mixing of components having parallel internal threads and taper internal threads is avoided in the same piping system. Relevant EN product or application standards will normally specify whether parallel and /or taper internal threads are p
24、ermitted for these products or applications. Users should select the internal thread type to suit their product or application requirements. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standar
25、d: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom Licensed Copy: Wang Bin, n
26、a, Fri Apr 14 08:08:51 BST 2006, Uncontrolled Copy, (c) BSIEN 10226-2:2005 (E) 4 1 Scope This European Standard specifies the requirements for thread form, dimensions, tolerances and designation for jointing pipe threads, sizes 1/16 to 6 inclusive, for joints made pressure-tight by the mating of the
27、 threads. These threads are taper external and taper internal and are intended for use with pipes suitable for threading and for valves, fittings or other pipeline equipment interconnected by threaded joints. An appropriate thread sealant or jointing compound should be used on the thread to ensure p
28、ressure-tight joints. NOTE 1 Threaded joints using taper external threads and parallel internal threads are detailed in EN 10226-1. NOTE 2 The requirements for taper external threads are identical in EN 10226-1 and EN 10226-2. NOTE 3 For pipe threads where pressure-tight joints are not made on the t
29、hreads see EN ISO 228-1. NOTE 4 EN 10226-3 gives details of recommended gauging systems for the verification of thread dimensions and thread form. 2 Normative references The following referenced documents are indispensable for the application of this European Standard. For dated references, only the
30、 edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 10226-3, Pipe threads where pressure-tight joints are made on the threads Part 3: Verification by means of limit gauges 3 Terms and definitions For the purposes of thi
31、s European Standard, the following terms and definitions apply (see also Figures 2 and 3). NOTE For consistency and clarity, common terms and definitions have been adopted for EN 10226-1 and EN 10226-2. Consequently some definitions may include terms that seem inappropriate to this document. 3.1 gau
32、ge diameter major diameter of the thread, whether external or internal, at the gauge plane 3.2 major cone imaginary cone, which just touches the crests of a taper external thread or the roots of a taper internal thread 3.3 gauge plane plane, perpendicular to the axis of the taper thread, at which th
33、e major cone has the gauge diameter NOTE 1 For external threads the gauge plane is located at a distance equal to the gauge length from the small end of the thread. NOTE 2 For taper internal threads; the gauge plane is located at a distance of half pitch behind the face of the threaded work piece. T
34、his distance has been agreed so that the position of the gauge plane on taper internal threads is consistent with parallel internal threads in EN 10226-1. 3.4 gauge length on an external thread, the distance from the gauge plane to the small end of the thread, measured parallel to the axis Licensed
35、Copy: Wang Bin, na, Fri Apr 14 08:08:51 BST 2006, Uncontrolled Copy, (c) BSIEN 10226-2:2005 (E) 5 3.5 reference plane visible surface of the internally and externally threaded parts, which facilitates the reading of the gauge when the thread is inspected. For internal threads it is the face of the i
36、nternally threaded part, for external threads it is the small end of the externally threaded part 3.6 complete thread part of the thread that is fully formed at both crest and root NOTE When there is a chamfer at the start of the thread not exceeding one pitch in length, this is included in the leng
37、th of the complete thread. 3.7 incomplete thread part of the thread that is fully formed at the root, but truncated at the crest by its intersection with the cylindrical surface of the product 3.8 washout thread part of the thread that is not fully formed at the root NOTE The washout thread is produ
38、ced by the bevel at the start of the threading tool. 3.9 useful thread complete thread plus incomplete thread, excluding the washout thread NOTE In practice, the total length of useful external thread may be longer than is necessary depending on the production techniques used for producing the threa
39、ds and the external diameter of the work piece. The provision of excessive lengths of useful external thread should be avoided. 3.10 assembly length useful thread length beyond the gauge plane of an external thread required to provide for assembly with an internal thread at the upper limit of the to
40、lerance. It is inclusive of the wrenching length NOTE 1 See also 7.2.2. NOTE 2 This term is also known as “fitting allowance“. 3.11 wrenching length useful thread length that is provided to accommodate the relative movement between the externally threaded part and the internally threaded part during
41、 the wrenching operation, following hand-tight engagement NOTE This term is also known as “wrenching allowance“. 3.12 accommodation length distance on internally threaded work pieces, from the face of the work piece to the first obstruction, which the externally threaded work piece will encounter on
42、 assembly Licensed Copy: Wang Bin, na, Fri Apr 14 08:08:51 BST 2006, Uncontrolled Copy, (c) BSIEN 10226-2:2005 (E) 6 4 Symbols and explanations Symbol Meaning R Designation of taper external thread Rc Designation of taper internal thread p Pitch H Height of the triangle of the thread profile perpend
43、icular to the thread axis h = 0,640 327P; height of the thread profile between rounded crests and roots perpendicular to the thread axis r Radius of rounded crests and roots D Major diameter of the internal thread at the gauge plane (gauge diameter - see 3.1) D1= D - 1,280 654 P; minor diameter of t
44、he internal thread at the gauge plane D2= D - 0,640 327 P; pitch diameter of the internal thread at the gauge plane d Major diameter of the external thread at the gauge plane (gauge diameter - see 3.1) d1=d - 1,280 654 P; minor diameter of the external thread at the gauge plane d2=d - 0,640 327P; pi
45、tch diameter of the external thread at the gauge plane T1Tolerance on the gauge length of an external thread T2Tolerance for the position of the gauge plane on an internal thread LaAccommodation length (see 7.2.2) LiUseful thread length for internally threaded workpieces (see 7.2.2) LeUseful thread
46、length for externally threaded workpieces (see 7.2.2) 5 Dimensions Pipe thread dimensions are given in Table 1. 6 Designation 6.1 The designation of threads according to this document shall consist of the following elements in the sequence given: 6.2 The description block shall be: Pipe thread 6.3 T
47、he European Standard number block shall be: EN 10226 Licensed Copy: Wang Bin, na, Fri Apr 14 08:08:51 BST 2006, Uncontrolled Copy, (c) BSIEN10226-2:2005 (E) 7 Table 1 Dimensions12 3 4 5 6 78910 111213141516171819PitchHeight ofthread Diameters atgaugeplaneGaugelength(external thread)Assembly lengthLe
48、 Lengthofuseful externalthread not less thanToleranceon position ofgauge plane oninternalthreadP hMajor(gaugediameter)PitchMinorNominalToleranceT1/2max.min.Fornominal gauge lengthFormaximumgaugelength Forminimumgaugelength ToleranceT2/2d=Dd2= D2d1= D1a ThreadsizeNumberofthreads in25,4 mmmmmmmmmmmmmm
49、mmTurns ofthreadmmmmmmaTurns of threadmmmmmmmmaTurns ofthread1/161/81/4 3/8 1/2 3/4 1 1.1/4 1.1/2 2 2.1/2 3 4 5 62828191914141111111111111111110,9070,9071,3371,3371,8141,8142,3092,3092,3092,3092,3092,3092,3092,3092,3090,5810,5810,8560,8561,1621,1621,4791,4791,4791,4791,4791,4791,4791,4791,4797,7239,72813,15716,66220,95526,44133,24941,91047,80359,61475,18487,884113,030 138,430 163,8307,142 9,14712,301 15,806 19,793 25,279 31,770 40,431 46,324 58,135 73,705 86,405 111,551136,951162,3516,561 8,56611,44514,95018,63124,11730,29138,95244,84556,65672,22684,926110,07213
