1、BRITISH STANDARD BS 2782-11: Method 1121C: 1997 ISO 161-2: 1996 Methods of testing Plastics Part 11: Thermoplastics pipes, fittings and valves Method 1121C Thermoplastics pipes for the conveyance of fluids Nominal outside diameters and nominal pressures Inch-based series ICS 23.040.20BS2782-11:Metho
2、d 1121C:1997 This British Standard, having been prepared under the directionof the Sector Board forMaterials and Chemicals, waspublished under the authorityof the Standards Boardand comes into effect on 15June 1997 BSI 09-1999 ISBN 0 580 27563 9 Amendments issued since publication Amd. No. Date Comm
3、entsBS2782-11:Method 1121C:1997 BSI 09-1999 i Contents Page National foreword ii Foreword iii Text of ISO 161-2 1BS2782-11:Method 1121C:1997 ii BSI 09-1999 National foreword This British Standard reproduces verbatim ISO 161-2:1996 and implements it as the UK national standard. This International Sta
4、ndard is incorporated into BS2782 Methods of testing plastics: Part 11: Thermoplastics pipes, fittings and valves, as Method1121C, for association with related test methods for plastics materials and plastics piping components. In this context, attention is drawn to BS2782-11:Method1121B:1997, which
5、 is the dual-numbered version of ISO161-1:1996 Thermoplastics pipes for the conveyance of fluids Nominal outside diameters and nominal pressures Part 1: Metric series. These standards are included among these test methods because they provide the basis for calculation of test pressure/wall stress re
6、lationships required by some of the other methods. This British Standard, together with BS ISO4065 and BS ISO11922-2 when available, will partially supersede BS3867:1987, which will become obsolescent and retained only to support existing British Standards. The UK participation in its preparation wa
7、s 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 interest
8、s 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 referred
9、 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. WARNING NOTE This British Standard, which is identical with ISO161-2:1996, does not nece
10、ssarily detail all the precautions necessary to meet the requirements of the Health and Safety at Work etc. Act1974. Attention should be paid to any appropriate safety precautions and the method should be operated only by trained personnel. A British Standard does not purport to include all the nece
11、ssary provisions of a contract. 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, theIS
12、O title page, pages ii to iv, pages 1 to 4 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.BS2782-11:Method 1121C:1997 ii BSI 09-1999 Contents Page Foreword iii Int
13、roduction 1 1 Scope 1 2 Normative references 1 3 Definitions 1 4 Nominal outside diameter, d n , and nominal size, DN 2 5 Nominal pressure rating, PN 3 6 Minimum required strength, MRS 3 Annex A (informative) Bibliography 4 Table 1 Permitted values of nominal outside diameter, d n , and nominal size
14、, DN 3 Table 2 Permitted values of nominal pressure rating, PN 3 Table 3 Permitted values of minimum required strength, MRS 3 Descriptors: Fluid pipelines, pipes (tubes), thermoplastic resins, plastic tubes, specifications, mechanical strength, pressure, dimensions, diameters, imperial system.BS2782
15、-11:Method 1121C:1997 BSI 09-1999 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
16、 interested in a subject for which 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 Electrotec
17、hnical Commission (IEC) on all matters 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
18、. International Standard ISO161-2 was prepared by Technical Committee ISO/TC138, Plastics pipes, fittings and valves for the transport of fluids. This second edition cancels and replaces the first edition (ISO161-2:1977), which has been technically revised. ISO161 consists of the following parts, un
19、der the general title Thermoplastics pipes for the conveyance of fluids Nominal outside diameters and nominal pressures: Part 1: Metric series; Part 2: Inch-based series. Annex A of this part of ISO161 is for information only.iv blankBS2782-11:Method 1121C:1997 BSI 09-1999 1 Introduction In this par
20、t of ISO161, some of the abbreviations used have been derived from the French language and others from English. It has been agreed to maintain the same abbreviations in both the French and English versions of the document. For reference, the abbreviations are listed below with the originating langua
21、ge given first and the translation second: 1 Scope This part of ISO161 specifies the nominal outside diameters for inch-based thermoplastics pipes for the conveyance of fluids in pressure and non-pressure applications. It also specifies nominal pressure ratings, minimum required strengths and overal
22、l service (design) coefficients for thermoplastics pipes for pressure applications. It is applicable to smooth thermoplastics pipes of constant circular cross-section along the whole length of the pipe, whatever their method of manufacture or material of construction. 2 Normative references The foll
23、owing standards contain provisions which, through reference in this text, constitute provisions of this part of ISO161. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO161 are encouraged to inves
24、tigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 3:1973, Preferred numbers Series of preferred numbers. ISO 12162:1995, Thermoplastics materials for pipes and fittin
25、gs for pressure applications Classification and designation Overall service (design) coefficient. 3 Definitions For the purposes of this part of ISO161, the following definitions apply. 3.1 nominal outside diameter, d n for inch-based series pipes conforming to this part of ISO161, the nominal outsi
26、de 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 nominal size, DN an alphanumerical designation of size which is common to all components in a thermoplastics piping system other than f
27、langes and components designated by thread size. It is a convenient round number for reference purposes 3.3 Outside diameter, d e 3.3.1 mean outside diameter, d em the measured length of the outer circumference of the pipe divided by ; 1) , rounded up to the nearest0,1mm 3.3.2 minimum mean outside d
28、iameter, d em,min the minimum value of the mean outside diameter specified in the applicable pipe standard. It is equal to the nominal outside diameter d n , expressed in millimetres 3.4 Pressure 3.4.1 nominal pressure, PN an alphanumeric designation related to the mechanical characteristics of the
29、components of a piping system and used for reference purposes. It is a convenient number selected from the R10 series as defined in ISO3 3.4.2 maximum allowable operating pressure, p PMS the allowable pressure in the pipe when the overall service (design) coefficient C has been applied. It is expres
30、sed in megapascals PN: Pression nominale (F) Nominal pressure (E) PMS: Pression maximale de service (F) Maximum allowable operating pressure (E) MRS: Minimum required strength (E) Rsistance minimale requise (F) s : Design stress (E) Contrainte de calcul (F) 1) The value of ; is taken to be 3,142.BS2
31、782-11:Method 1121C:1997 2 BSI 09-1999 3.5 lower confidence limit, LCL a quantity with the dimensions of stress, in megapascals, which can be considered as a property of the material under consideration and represents the 97,5% lower confidence limit of the predicted long-term hydrostatic strength a
32、t 20 C for 50years with internal water pressure 3.6 minimum required strength, MRS the value of the lower confidence limit LCLrounded down to the next value in the R10 series as defined in ISO3 when LCLis less than 10MPa or down to the next value in the R20 series as defined in ISO3 when LCLis great
33、er than or equal to 10MPa. The MRS is expressed as a hoop stress in megapascals 3.7 overall service (design) coefficient, C an overall coefficient with a value greater than1, which takes into consideration service conditions as well as properties of the components of a piping system other than those
34、 represented in the lower confidence limit the minimum values of C for specified materials are given in ISO12162 3.8 design stress, s the allowable stress for a given application. It is derived by dividing the MRS by the overall service (design) coefficient C and rounding to the nearest lower value
35、in the R20 series as defined in ISO3,i.e. it is expressed in megapascals 3.9 standard dimension ratio, SDR the ratio of the nominal outside diameter of a pipe to its nominal wall thickness the SDR can be calculated from either of the following equations: or where for a given SDR, and using the value
36、s of MRS and C specified in the applicable product standard, the maximum allowable operating pressure p PMScan be calculated from either of the following equations: or 3.10 hydrostatic stress, the stress induced in the wall of a pipe when the pipe is filled with a fluid under pressure. The hydrostat
37、ic stress, expressed in megapascals, is related to the pressure, the wall thickness and the outside diameter of the pipe by the following equation: where 4 Nominal outside diameter, d n , and nominal size, DN The nominal outside diameter d nand nominal size DN shall be selected from the values given
38、 in Table 1. s MRS C - = MRS is the minimum required strength, in megapascals; p PMS is the maximum allowable operating pressure, in megapascals; C is the overall service (design) coefficient; s is the design stress, in megapascals. p is the hydrostatic pressure, in megapascals; d e is the outside d
39、iameter of the pipe, inmillimetres; e is the wall thickness of the pipe, inmillimetres.BS2782-11:Method 1121C:1997 BSI 09-1999 3 Table 1 Permitted values of nominal outside diameter, d n , and nominal size, DN 5 Nominal pressure rating, PN The nominal pressure rating PN shall be selected from the va
40、lues given inTable 2. Table 2 Permitted values of nominal pressure rating, PN (together with the corresponding values of the maximum allowable operating pressure p PMS ) 6 Minimum required strength, MRS The minimum required strength MRS shall be selected from the values given inTable 3. Table 3 Perm
41、itted values of minimum required strength, MRS d n DN d n DN d n DN 10,2 13,5 17,2 21,3 1/8 1/4 3/8 1/2 114,3 140,3 168,3 193,7 4 5 6 7 558,2 609,6 660,4 711,2 22 24 26 28 26,9 33,7 42,4 48,3 3/4 1 1 1/4 1 1/2 219,1 244,5 273 323,9 8 9 10 12 762 812,8 863,6 914,4 30 32 34 36 60,3 75,3 88,9 101,6 2 2
42、 1/2 3 3 1/2 355,6 406,4 457,2 508 14 16 18 20 1 016 40 PN p PMS bar MPa 1 2,5 3,2 4 1 2,5 3,2 4 0,1 0,25 0,32 0,4 5 6 6,3 8 5 6 6,3 8 0,5 0,6 0,63 0,8 10 12,5 16 20 10 12,5 16 20 1 1,25 1,6 2 NOTEIf higher nominal pressures are required, they shall be selected from the R5 or R10 series given in ISO
43、3. Values in megapascals 1 1,25 1,6 2 6,3 8 10 11,2 20 22,4 25 28 2,5 3,15 4 5 12,5 14 16 18 31,5 35,5 40 NOTEThe steps between the values from 1 to 10 are based on the R 10 series given in ISO 3 (25 % increments), whilst the steps between the values greater than 10 are based on the R 20 series (12
44、% increments).BS2782-11:Method 1121C:1997 4 BSI 09-1999 Annex A (informative) Bibliography 1 ISO 161-1:1996, Thermoplastics pipes for the conveyance of fluids Nominal outside diameters and nominal pressures Part 1: Metric series. 2 ISO 497:1973, Guide to the choice of series of preferred numbers and
45、 of series containing more rounded values of preferred numbers. 3 ISO 4065:1996, Thermoplastics pipes Universal wall thickness table.5 blankBS 2782-11: Method 1121C: 1997 ISO 161-2: 1996 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body resp
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