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1、BRITISH STANDARD BS EN 10226-2:2005 Pipe threads where pressure tight joints are made on the threads Part 2: Taper, external threads and taper internal threads Dimensions, tolerances and designation The European Standard EN 10226-2:2005 has the status of a British Standard ICS 21.040.30 BS EN 10226-
2、2:2005 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 16 January 2006 BSI 16 January 2006 ISBN 0 580 47506 9 National foreword This British Standard is the official English language version of EN 10226-2:2005. The UK participation in its pre
3、paration was entrusted to 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 int
4、erests informed; monitor 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-references The British Standards which implement international or European publications ref
5、erred to in this document may 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 prov
6、isions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 13 and a back cover. The
7、 BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments W - - - - - - - - - - - - - 777 - - 7- - - 7- - - 7- 7- $ A A - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - W W D - - w - - - -
8、EN 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 lengths9 8 Gauging .11 Bibliography.13 EN 10226-2:2005 (E) 3 Foreword This document
9、 (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 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,
10、at the latest by February 2006, and conflicting national standards shall be withdrawn at the latest by February 2006. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. This document is based, with editorial modifications
11、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 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
12、 and 2 reflect the two thread jointing systems in regular use in Europe and Worldwide - Part 1 details taper external and parallel internal pipe threads, and Part 2 details taper external and taper internal pipe threads. Part 3 will provide requirements for the gauging of pipe threads conforming to
13、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 jointing system in each part. Components having pipe threads produced to the dimensions and tolerances given in this European Standard can be assembled to
14、 give safe and effective pressure tight joints providing proper assembly techniques are used. The techniques used to assemble threaded joints are dependent on a number of factors including the internal thread (parallel or taper), the quality of the mating threads, the materials of the components bei
15、ng connected, the thread sealant or jointing compound used and the assembly torque. Because of the different assembly techniques used for the taper / parallel and taper / taper systems, it is recommended that mixing of components having parallel internal threads and taper internal threads is avoided
16、 in the same piping system. Relevant EN product or application standards will normally specify whether parallel and /or taper internal threads are permitted for these products or applications. Users should select the internal thread type to suit their product or application requirements. According t
17、o the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Lu
18、xembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom EN 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
19、 inclusive, for joints made pressure-tight by the mating of the 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 sealan
20、t or jointing compound should be used on the thread to ensure pressure-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
21、 pipe threads where pressure-tight joints are not made on the threads 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 applic
22、ation of this European Standard. For dated references, only the 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
23、of limit gauges 3 Terms and definitions For the purposes of this 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
24、include terms that seem inappropriate to this document. 3.1 gauge 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 pl
25、ane, perpendicular to the axis of the taper thread, at which the 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 dista
26、nce of half pitch behind the face of the threaded work piece. This 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 s
27、mall end of the thread, measured parallel to the axis EN 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 internally threaded par
28、t, 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 length of the complete thr
29、ead. 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 produced by the bevel at th
30、e 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 threads and the external di
31、ameter 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 tolerance. It is inclusi
32、ve 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 the wrenching operati
33、on, 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 assembly EN 10226-2:2
34、005 (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 perpendicular to the thread axis h = 0,640 327P; height of the thread profile between rounded crests and roots per
35、pendicular 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 the internal thread at the gauge plane D2 = D - 0,640 327 P; pitch diameter of the internal thread at the g
36、auge 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; pitch diameter of the external thread at the gauge plane T1 Tolerance on the gauge length of an external
37、thread T2 Tolerance for the position of the gauge plane on an internal thread La Accommodation length (see 7.2.2) Li Useful thread length for internally threaded workpieces (see 7.2.2) Le Useful thread length for externally threaded workpieces (see 7.2.2) 5 Dimensions Pipe thread dimensions are give
38、n 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 The European Standard number block shall be: EN 10226 EN 10226-2:2005 (E) 8 6.4 The individual item
39、 block shall be composed of: a) symbol for type of pipe thread; a) R for external taper pipe thread; b) Rc for internal taper pipe thread; b) the thread size, from column 1 of Table 1. EXAMPLE The complete designation for a right-hand thread size 1 1/2: External taper thread: Pipe thread EN 10226 R
40、1 1/2 Internal taper thread: Pipe thread EN 10226 Rc 1 1/2 6.5 For left hand threads, the letters LH shall be added to the designation. Right hand threads require no special designation. 7 Thread design 7.1 Thread form 7.1.1 Direction of thread helix Unless otherwise specified, the EN 10226-2 thread
41、 shall be a right-hand thread (see also 6.5). 7.1.2 Taper internal and external thread The basic form of the taper pipe thread shall be as shown in Figure 1. The taper is 1 to 16 measured on the diameter. The angle between the flanks, measured in an axial plane section is 55, the flanks making equal
42、 angles with the axis. The thread profiles are rounded off equally at crests and roots by circular arcs blending tangentially with the flanks. EN 10226-2:2005 (E) 9 Key 1 gauge plane 2 taper p pitch H 0,960237p h 0,640327p r 0,137278p Figure 1 Taper thread 7.2 Thread lengths 7.2.1 External thread Th
43、e terms relating to the external taper pipe thread are given in Figure 2. The useful thread length Le, allowable in practice, is the sum of the lengths of the complete and incomplete threads, excluding the washout thread. The useful thread length shall not be less than the minimum gauge length plus
44、the assembly length. 7.2.2 Internal thread The terms relating to the internal taper pipe thread are given in Figure 2. The design of an internally threaded workpiece shall be such that the accommodation length La, and useful thread length Li in the case of threads with free run out, can receive exte