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1、BRITISH STANDARD BS ISO 11922-2:1997 Thermoplastics pipes for the conveyance of fluids Dimensions and tolerances Part 2: Inch-based series ICS 23.040.20 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:47:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 11922-2:1997 This British Standar
2、d, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 June 1997 BSI 09-1999 ISBN 0 580 27768 2 National foreword This British Standard reproduces verbatim ISO 11922-2:1997 and
3、implements it as the UK national standard. This British Standard, together with BS 2782-11:Method 1121C (identical to ISO 161-2) and BS ISO 4065, partially supersedes BS 3867:1987, which becomes obsolescent and retained only to support existing British Standards. The UK participation in its preparat
4、ion was entrusted to Technical Committee PRI/61, Plastics piping systems and components, 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 the UK in
5、terests 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 re
6、ferred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a c
7、ontract. Users of British Standards are responsible for their 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, pages i and ii, the ISO title page, pages ii
8、 to iv, pages 1 to 10 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffield
9、un, na, Sun Nov 26 06:47:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 11922-2:1997 BSI 09-1999i Contents Page National forewordInside front cover Forewordiii Text of ISO 11922-21 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:47:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii bla
10、nk Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:47:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:47:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 11922-2:1997 ii BSI 09-1999 Contents Page Forewordiii Introduction1 1Scope1
11、2Normative reference1 3Definitions1 4Tolerances on outside diameters2 5Tolerances on wall thickness3 6Measurement of dimensions7 Annex A (informative) Bibliography10 Table 1 Tolerances on mean outside diameters Inch-based series3 Table 2 Tolerances on out-of-roundness Inch-based series3 Table 3 Tole
12、rances on wall thickness at any point Grade T5 Table 4 Tolerances on wall thickness at any point Grade U6 Table 5 Tolerances on wall thickness at any point Grade V7 Table 6 Tolerances on mean wall thickness Grade W8 Table 7 Tolerances on mean wall thickness Grade X9 Descriptors: Fluid pipelines, pip
13、es (tubes), thermoplastic resins, plastic tubes, form specifications, dimensions, diameters, thickness, dimensional tolerances, form tolerances, imperial system. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:47:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 11922-2:1997 BSI 09-1999
14、iii 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
15、 a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all mat
16、ters of electrotechnical standardization. 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. International Standard ISO 1192
17、2-2 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the transport of fluids. Together with ISO 11922-1, it cancels and replaces ISO 3606:1976, ISO 3607:1977, ISO 3608:1976 and ISO 3609:1977. ISO 11922 consists of the following parts, under the general title Th
18、ermoplastics pipes for the conveyance of fluids Dimensions and tolerances: Part 1: Metric series; Part 2: Inch-based series. Annex A of this part of ISO 11922 is for information only. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:47:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank
19、Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:47:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 11922-2:1997 BSI 09-19991 Introduction In the past, International Standards specifying the tolerances to be applied to thermoplastics pipes have covered individual materials separately.
20、The philosophy of ISO 11922 is to combine these already published standards into a single two-part standard covering the tolerances for extruded pipes manufactured from all thermoplastics materials, thus avoiding the need for a standard to be developed for each individual material. ISO 11922 therefo
21、re contains a number of tolerance grades covering the mean outside diameter, the out-of-roundness of the outside diameter, the wall thickness at any point and the mean wall thickness. The bodies responsible for writing the various product and system standards will choose, from the specified toleranc
22、e grades, that grade which is suitable for the application and material involved. 1 Scope This part of ISO 11922 specifies tolerance grades for the outside diameter, out-of-roundness and wall thickness of inch-based thermoplastics pipes for the conveyance of fluids and manufactured with nominal outs
23、ide diameters and nominal pressures in accordance with ISO 161-211 (see Annex A). It is applicable to smooth thermoplastics pipes of constant circular cross-section along the whole length of the pipe, whatever the method of manufacture, the pipe material or the intended application. NOTEIt is intend
24、ed that the tolerance grades specified in product standards be selected from this part of ISO 11922, taking into account the material and the intended application. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this pa
25、rt of ISO 11922. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this part of ISO 11922 are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of
26、 IEC and ISO maintain registers of currently valid International Standards. ISO 3126:1974, Plastics pipes Measurement of dimensions. 3 Definitions For the purposes of this part of ISO 11922, the following definitions apply. 3.1 nominal outside diameter, dn for inch-based series pipe conforming to IS
27、O 161-2, the nominal outside diameter serves as a reference outside diameter, expressed in millimetres, to which the permissible deviations are applied as positive and/or negative values 3.2 Outside diameter, de 3.2.1 mean outside diameter, dem the measured length of the outer circumference of the p
28、ipe divided by ;1), rounded up to the nearest 0,1 mm 3.2.2 minimum mean outside diameter, dem,min the minimum value of the mean outside diameter specified in the applicable pipe standard. It is equal to the nominal outside diameter dn, expressed in millimetres 3.2.3 maximum mean outside diameter, de
29、m,max the maximum value of the mean outside diameter specified in the applicable pipe standard 3.2.4 outside diameter at any point, dey the measured outside diameter through the cross-section at any point of the pipe, rounded up to the nearest 0,1 mm 3.2.5 out-of-roundness the difference between the
30、 measured maximum outside diameter and the measured minimum outside diameter in the same cross-sectional plane of the pipe 3.3 Terms relating to tolerances2) 3.3.1 tolerance the permissible variation of the specified value of a quantity, expressed as the difference between permissible maximum and mi
31、nimum values 3.3.2 permissible deviation the difference between a permissible limiting value and a reference value 1) The value for ; is taken to be 3,142. 2) These definitions are consistent with ISO 286-12. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:47:06 GMT+00:00 2006, Uncontrolle
32、d Copy, (c) BSI BS ISO 11922-2:1997 2 BSI 09-1999 3.3.3 tolerance grade in a standardized system of limits and fits, a group of tolerances considered as corresponding to the same level of accuracy for all basic sizes 3.4 Wall thickness, e 3.4.1 wall thickness at any point, ey the measured wall thick
33、ness at any point around the circumference of the pipe, rounded up to the nearest 0,1 mm 3.4.2 minimum wall thickness, ey,min the minimum wall thickness for the pipe specified in the applicable pipe standard 3.4.3 maximum wall thickness, ey,max the maximum wall thickness for the pipe specified in th
34、e applicable pipe standard 3.4.4 mean wall thickness, em the arithmetic mean of at least four measurements regularly spaced around the same cross-sectional plane of the pipe, including the measured minimum and maximum values obtained, rounded up to the nearest 0,1 mm NOTEThe minimum number of measur
35、ements will be specified in the applicable pipe standard. The actual number of measurements will then depend on the fact that the measurement points have to be regularly spaced round the cross-sectional plane and, in addition, have to include both the minimum and the maximum measured values. 4 Toler
36、ances on outside diameters 4.1 Mean outside diameter For pipes conforming to ISO 161-2, no relationships are specified or implied between the nominal outside diameter dn and either the minimum outside diameter de,min (expressed in millimetres) or the maximum outside diameter de,max (expressed in mil
37、limetres) except that dn shall lie within, or at either limit of, the range de,min to de,max. The nominal outside diameter specified in ISO 161-2 therefore serves as a reference mean outside diameter relative to which the permissible deviation may comprise positive (y) and/or negative (z) values. Th
38、e actual limits on outside diameters for such pipes shall therefore be obtained by choosing, from Table 1 of this part of ISO 11922, a tolerance x appropriate to the nominal size, application and material of the pipe, and expressing that tolerance in the formmm relative to the nominal outside diamet
39、er as the reference, where x = y + z. NOTEIn this context, the term “mean outside diameter” is the arithmetic mean of a series of diameter measurements, and not the central (median) value in a range of permissible diameters. Because de,min is not directly related to the outside diameter of a pipe as
40、 specified in ISO 161-2, the values given in Table 1 for tolerance grades F, G and H have been calculated using the same relationship as that used in ISO 11922-13 for grades A, B and C, respectively, where the value of the nominal outside diameter, in millimetres, appropriate to the nominal size as
41、specified in ISO 161-2, has been used in place of de,min. Grade F: For all nominal outside diameters, the tolerance equals 0,009dn, rounded up to the nearest 0,1 mm, with a minimum value of 0,3 mm and a maximum value of 9,2 mm. Grade G: For all nominal outside diameters, the tolerance equals 0,006dn
42、, rounded up to the nearest 0,1 mm, with a minimum value of 0,3 mm and a maximum value of 4,0 mm. Grade H: For all nominal outside diameters, the tolerance equals 0,003dn, rounded up to the nearest 0,1 mm, with a minimum value of 0,3 mm and a maximum value of 2,0 mm. 4.2 Out-of-roundness of outside
43、diameter Three tolerance grades are given in Table 2. The tolerance values for each grade are calculated from the nominal outside diameter dn specified in the applicable product standard, all diameters being expressed in millimetres. The calculation factors used are based on practical experience. Gr
44、ade P is recommended for coiled pipe, subject to an appropriate relaxation treatment being specified in the product standard. Grade P: The tolerance equals 0,06dn, rounded up to the nearest 0,1 mm, and is applicable to nominal outside diameters u 114,3. Grade Q: The tolerance equals 0,024dn, rounded
45、 up to the nearest 0,1 mm, with a minimum value of 1,0 mm. Grade R: a) For nominal outside diameters u 75,3, the tolerance equals (0,008dn + 1) mm, rounded up to the nearest 0,1 mm. b) For nominal outside diameters 75,3 but u 244,5, the tolerance equals 0,02dn, rounded up to the nearest 0,1 mm. c) F
46、or nominal outside diameters 244,5, the tolerance equals 0,035dn, rounded up to the nearest 0,1 mm. NOTEThe applicable pipe standard will specify the point in time at which the out-of-roundness is to be measured, e.g. at the time of extrusion, the time the product leaves the factory or the time of u
47、se. y+ z Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:47:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 11922-2:1997 BSI 09-19993 Table 1 Tolerances on mean outside diameters Inch-based series Table 2 Tolerances on out-of-roundness Inch-based series 5 Tolerances on wall thickness
48、5.1 Wall thickness at any point ey Three tolerance grades are given in Table 3, Table 4 and Table 5 which cover minimum wall thicknesses ey,min up to 50 mm ( Table 3 and Table 4) and 46 mm (Table 5). The tolerance grade may be specified in product standards. Tolerances in millimetres Nominal outside
49、 diameter Tolerances dnGrade FGrade GGrade H 10,2 13,5 17,2 21,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3 26,9 33,7 42,4 48,3 0,3 0,4 0,4 0,5 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3 60,3 75,3 88,9 101,6 0,6 0,7 0,8 1,0 0,4 0,5 0,6 0,7 0,3 0,3 0,3 0,4 114,3 140,3 168,3 193,7 1,1 1,3 1,6 1,8 0,7 0,9 1,1 1,2 0,4 0,5 0,5 0,6 219,1 244,5 273 323,9 2,0 2,2 2,5 3,0 1,4 1,5 1,7 2,0 0,7 0,8 0,9 1,0 355,6 406,4 457,2 508 3,2 3,7 4,2 4,6 2,2 2,5 2,8 3,1 1,1 1,2 1,4 1,5 558,2 609,6 660,4 711,2 5,1 5,5 6,0 6,4 3,4 3,7 4,0 4,0 1,7 1,8