1、BRITISH STANDARD BS EN ISO 228-2:2003 Pipe threads where pressure-tight joints are not made on the threads Part 2: Verification by means of limit gauges The European Standard EN ISO 228-2:2003 has the status of a British Standard ICS 21.040.30 BS EN ISO 228-2:2003 This British Standard was published
2、 under the authority of the Standards Policy and Strategy Committee on 26 February 2003 BSI 26 February 2003 ISBN 0 580 41321 7 National foreword This British Standard is the official English language version of EN ISO 228-2:2003. It is identical with ISO 228-2:1987. Together with BS EN ISO 228-1:20
3、03 it supersedes BS 2779:1986 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee ISE/19, Ferrous pipe fittings (excluding cast iron), which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its
4、 secretary. Cross-references The British Standards which implement international or European publications referred 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
5、Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to underst
6、and the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises
7、a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, the ISO foreword page, pages 1 to 13 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No
8、. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM ENISO2282 February2003 ICS21.040.30 Englishversion Pipethreadswherepressuretightjointsarenotmadeonthe threadsPart2:Verificationbymeansoflimitgauges(ISO228 2:1987) Filetagesdetuyauteriepourraccordementsanstanchit danslefiletPartie2:Vrifica
9、tionparcalibreslimites (ISO2282:1987) RohrgewindefrnichtimGewindedichtendeVerbindungen Teil2:PrfungmitGrenzlehren(ISO2282:1987) ThisEuropeanStandardwasapprovedbyCENon27December2002. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Stand
10、ardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra
11、nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlan
12、ds,Norway,Portugal,SlovakRepublic,Spain,Sweden,Switzerland and UnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2003CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnation
13、alMembers. Ref.No.ENISO2282:2003EForeword ThetextofISO2282:1987hasbeenpreparedbyTechnicalCommitteeISO/TC5“Ferrous metalpipesandmetallicfittings“oftheInternationalOrganizationforStandardization(ISO)and hasbeentakenoverasENISO2282:2003byTechnicalCommitteeECISS/TC29“Steeltubes andfittingsforsteeltubes“
14、,thesecretariatofwhichisheldbyUNI. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationof anidenticaltextorbyendorsement,atthelatestbyAugust2003,andconflictingnational standardsshallbewithdrawnatthelatestbyAugust2003. AccordingtotheCEN/CENELECInternalRegulations,thenation
15、alstandardsorganizationsof thefollowingcountriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,Czech Republic,Denmark,Finland,France,Germany,Greece,Hungary,Iceland,Ireland,Italy, Luxembourg,Malta,Netherlands,Norway,Portugal,Slovakia,Spain,Sweden,Switzerlandand theUnitedKingdom. Endorsementn
16、otice ThetextofISO2282:1987hasbeenapprovedbyCENasENISO2282:2003withoutany modifications. ENISO2282:2003INTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MEXflYHAPOflHAR OPrAHM3AMfl l-l0 CTAHflAPTM3AMM Pipe threads where pressure-tight
17、joints are not made on the threads - Part 2 : Verification by means of limit gauges Filetages de tu yauterie pour raccordemen t sans I n I Nominal value of b3 I I P I Pitch I Displacement of the clearance groove with trun- 1 ( cated flanks I b) the threaded NOT GO gauges for the threads of the piece
18、s (see clauses 6 and 7) fix the minimum material limit on the flanks of the thread. I S I Tolerance on b3 I Tolerance on the pitch diameter of GO and NOT GO threaded check plugs and wear check plugs NOTE - Reference checks may be carried out in specialized laboratories. I Td2 I thread Tolerance on t
19、he pitch diameter of the external I 1 TD2 1 thread Tolerance on the pitch diameter of the internal 2 References I TpL I Tolerance on the pitch diameter of GO and NOT GO threaded plug gauges IS0 228-1, Pipe threads where pressure- tight joints are not made on the threads - Part I : Designation, dimen
20、sions and tolerances. I TR I Tolerance on the pitch diameter of GO and NOT GO threaded ring gauges I I u I = 0,147 84 P : Twice the radial height of rounding at crest and root of thread I IS0 1179, Pipe connections, threaded to IS0 228- 7, for plain end steel and other metal tubes in industrial appl
21、ications. wGO Average amount available for the permissible wear of GO threaded plug gauge and GO threaded ring WJW IS0 1502, IS0 general purpose metric screw threads - Gauging. WNG Average amount available for the permissible wear of NOT GO threaded plug gauge and NOT GO threaded ring gauge ZPL Dist
22、ance between the middle of the tolerance zone TPL of the GO threaded plug gauge and the lower limit of the thread 3 Symbols and explanations Distance between the middle of the tolerance zone TR of the GO threaded ring gauge and the upper limit of the thread The symbols used in this part of IS0 228 a
23、re the same as those used in IS0 1502 for the IS0 thread gauges, plus some addi- tional symbols (n, S, u), as shown in table 1. 1 1 ENISO2282:20031IS0 228-2 : 1987 (E) 4 Function, control and use of gauges 4.1 Gauges for external threads plugs 4.1.1 Solid GO threaded ring gauge 4.1.1.1 Function and
24、their check The threaded GO ring gauge checks the virtual size of the exter- nal thread on the GO side (gauging the virtual pitch diameter), i.e. it checks the maximum material limit of the pitch diameter, taking into account deviations of form (departures from round- ness and lack of straightness o
25、f the thread axis over the gauge length) and pitch errors, helix variations and errors in the flank angles, which produce an apparent enlargement of the pitch diameter (virtual pitch diameter). In addition, this gauge checks whether the length of the straight flank is adequate, i.e. that the roundin
26、g at the root of the profile does not encroach too far upon the flank of the thread. This gauge shows the maximum material limit. Checking with the threaded GO ring gauge is essentially in ac- cordance with the Taylor principle (see IS0 1502 : 1978, sub- clause 7.1.1). 4.1.1.2 Control The solid thre
27、aded GO ring gauge manufactured according to the prescribed sizes shall be checked using the threaded GO and NOT GO check plugs and should be controlled regularly with the wear check plug. If the NOT GO check plug is not used, other provisions shall be made so as to ensure that the maximum size of t
28、he pitch diameter of the threaded GO ring gauge is not exceeded. 4.1.1.3 Use The threaded GO ring gauge screwed by hand, without ex- cessive force, shall pass over the whole length of the thread. If this is not possible, the thread does not comply with the specifications. 4.1.2 Threaded check plugs
29、for new solid threaded GO ring gauge 4.1.2.1 Function These threaded check plugs (GO and NOT GO) are used to check the limits of the pitch diameter of the new solid threaded GO ring gauge. 4.1.2.2 Use The threaded GO check plug screwed by hand, without ex- cessive force, shall pass through the new s
30、olid threaded GO ring gauge. The threaded NOT GO check plug screwed by hand, without excessive force, may enter into both ends of the new solid threaded GO ring gauge, but not more than one turn of thread. l) 4.1.3 Wear check plug for solid threaded GO ring gauge 4.1.3.1 Function The wear check plug
31、 is used to ascertain that the pitch diameter of the threaded GO ring gauge has not exceeded the wear limit. It embodies the pitch diameter of the threaded GO ring gauge at the prescribed limit of wear. 4.1.3.2 Use The wear check plug screwed by hand, without excessive force, may enter into both end
32、s of the threaded GO ring gauge, but not more than one turn of thread? If it can be screwed in more than one turn of thread, the thread- ed GO ring gauge no longer meets the specifications. 4.1.4 Solid threaded NOT GO ring gauge 4.1.4.1 Function The threaded NOT GO ring gauge is intended to check wh
33、ether the actual pitch diameter exceeds the specified minimum size. The checking with the threaded NOT GO ring gauge does not correspond to the Taylor principle when checking rigid machin- ed pieces. In cases of non-rigid machined pieces, the departure from the Taylor principle is of less importance
34、 because of the flexibility of the pieces. 4.1.4.2 Control The solid threaded NOT GO ring gauge manufactured accord- ing to the prescribed sizes shall be checked using the threaded GO and NOT GO check plugs and should be controlled regular- ly with the wear check plug. If the NOT GO check plug is no
35、t used, other provisions shall be made to ensure that the maximum limit of the pitch diameter of the new threaded NOT GO ring gauge is not exceeded. 4.1.4.3 Use The threaded NOT GO ring gauge, screwed by hand without excessive force onto the thread, may be screwed on both sides but not more than two
36、 turns of thread? 1) The number of turns of thread is determined when unscrewing the plug or ring gauge. 3002:2822OSINE2 ENISO2282:20032IS0 228-2 :I987 (E) 4.2 Gauges for internal threads If the gauge can be screwed more than two turns thread does not comply with the specifications. , the 4.2.1 Thre
37、aded GO plug gauge The threaded NOT GO ring gauge shall not pass completely over a threaded part having a length of three threads or less. 4.2.1.1 Function The threaded GO plug gauge checks the virtual size of the inter- nal thread on the GO side (gauging the virtual pitch diameter). This is effecte
38、d by checking the minimum limit of the pitch diameter, taking into account pitch errors, errors in the flank angles, helix variations and deviations of form (departures from roundness and lack of straightness of the thread axis over the gauge length) which produce an apparent reduction of the pitch
39、diameter (virtual pitch diameter). In addition, it checks the minimum limit of the major diameter and also whether the length of straight flank is sufficient, i.e. that the rounding at the root of the profile does not encroach too far upon the flank of the thread. 4.1.5 Threaded check plugs for new
40、solid threaded NOT GO ring gauge 4.1.5.1 Function The check plugs (GO and NOT GO) are used to check the pitch diameter limits of the new solid threaded NOT GO ring gauge. The threaded GO check plug makes sure that the clearance diameter of the new solid threaded NOT GO ring gauge is not too small. I
41、f a wear check plug for the threaded NOT GO ring gauge is provided, the NOT GO check plug may be dispensed with. This gauge shows the maximum material limit. Checking with the threaded GO plug gauges is essentially in ac- cordance with the Taylor principle (see IS0 1502 : 1978, sub- clause 7.2. I).
42、4.1.5.2 Use The threaded GO check plug screwed by hand, without ex- cessive force, shall pass through the corresponding new solid threaded NOT GO ring gauge. 4.2.1.2 Control The threaded wear. GO plug ww should be checked regularly for The NOT GO check plug gauge screwed by hand, without ex- cessive
43、 force, may enter the new solid threaded NOT GO ring gauge at both ends, but not more than one turn of thread? The wear of the threaded GO plug gauge is found by measur- ing. 4.1.6 Wear check plug for solid threaded NOT GO ring SPwe 4.2.1.3 Use The threaded GO plug gauge screwed by hand, without ex-
44、 cessive force, shall pass through the whole length of the thread. If this is not possible, the thread does not comply with the specifications. 4.1.6.1 Function The wear check plug checks whether the pitch diameter of the threaded NOT GO ring gauge has exceeded the wear limit. It embodies the pitch
45、diameter of the threaded NOT GO ring gauge at the prescribed limit of wear. 4.2.2 Threaded NOT GO plug gauge 4.2.2.1 Function If a NOT GO check plug for the threaded NOT GO ring gauge is provided, the wear check plug may be dispensed with. The threaded NOT GO plug gauge checks whether the actual pit
46、ch diameter exceeds the specified maximum size. 4.1.6.2 Use The threaded NOT GO plug gauge checks approximately accord- ing to the Taylor principle (see IS0 1502 : 1978, sub- clause 7.2.2). The wear check plug screwed by hand, without excessive force, may enter into both ends of the threaded NOT GO
47、ring gauge, but not more than one turn of thread? 4.2.2.2 Control If it can be screwed in more than one turn of thread, the thread- ed NOT GO ring gauge no longer meets the specifications? The threaded NOT GO plug gauge shall be checked regularly for wear. The number of turns of thread is determined when unscrewing the plug or ring gauge. 1) 3 3002:2822OSINE3 ENISO2282:20033
