1、Designation: F 2261 06Standard Test Method forPressure Rating Poly(Vinyl Chloride) (PVC) Plastic PipeFittings, Schedule 40 and 80 Socket-Type.1This standard is issued under the fixed designation F 2261; the number immediately following the designation indicates the year oforiginal adoption or, in th
2、e case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers a procedure for establishingPressure Rating for PVC schedule
3、40 and 80 socket-typefittings by evaluating fitting failure test data derived by testingwater-filled assemblies of pipe and fittings.1.2 Unless the data approximates a straight line, whencalculated using log-log coordinates, it is not possible to assigna pressure rating to that product or sample of
4、product. Data thatexhibit high scatter, or a downward curve, due to low long termdata, will give low extrapolated values that are more conser-vative when calculated using log-log co-ordinates. In addition,this downward curve will show as higher scatter, and where thelower confidence level limits are
5、 not met the data shall beclassified as unsuitable. (See Note 1)NOTE 1This test method is similar to that used in Test MethodD 2837, which has been used for about 30 years to establish the HDS ofplastic pipe materials and is the basis for all pressure ratings assigned toplastic pipes.1.3 The product
6、s covered by this test method are schedule40 or 80 molded PVC fittings that conform to SpecificationsD 2466 or D 2467.1.4 The pressure ratings developed using this test methodapplies only to fittings identical to the ones that were tested.Some variables that will affect the pressure rating are pipes
7、ize, pattern, mold design, material, and molding conditions.1.5 The values in inch-pound units are to be regarded as thestandard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.6 The testing procedure us
8、ed to obtain the fitting failuredata shall be as described in those sections of Test MethodD 1598, that are referenced in Section 6 of this test method.1.7 The products covered by this test method are intendedfor use in the distribution of pressurized liquids at 73F. Whenappropriate, the design engi
9、neer must consider the effects ofelevated temperature and chemical compatibility of the liquidwith the fitting material and apply necessary design factors.1.8 This standard does not purport to address all of thesafety problems, if any, associated with its use. It is theresponsibility of the user of
10、this standard to establish appro-priate safety and health practices and determine the applica-tion of regulatory limitations prior to use.NOTE 2Pressurized (compressed) air or other compressed gasescontain large amounts of stored energy which present serious safetyhazards should a system fail for an
11、y reason.2. Referenced Documents2.1 ASTM Standards:2D 1598 Test Method for Time-to-Failure of Plastic PipeUnder Constant Internal PressureD 2466 Specification for Poly(Vinyl Chloride) (PVC) Plas-tic Pipe Fittings, Schedule 40D 2467 Specification for Poly(Vinyl Chloride) (PVC) Plas-tic Pipe Fittings,
12、 Schedule 80D 2837 Test Method for Obtaining Hydrostatic DesignBasis for Thermoplastic Pipe Materials or Pressure DesignBasis for Thermoplastic Pipe Products2.2 Other Standards:PPI Report TR-4 HDB/SDB/PDB/MRS Listed Materi-als33. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 fa
13、ilurethe act, state, or fact of failing, specifically alost of strength or breakdown of function3.1.1.1 Discussionfor testing purposes, failure is thebursting, cracking or weeping of the fitting3.1.2 LTHSpthe estimated internal pressure that whenapplied continuously will cause failure of the fitting
14、 at 100 000h. This is the intercept of the pressure regression line with the100 000-h intercept.3.1.3 pressure design basis (PDB)one of a series ofestablished pressure values for plastic piping components1This test method is under the jurisdiction of ASTM Committee F17 on PlasticPiping Systems and i
15、s the direct responsibility of Subcommittee F17.40 on TestMethods.Current edition approved July 1, 2006. Published July 2006.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information,
16、refer to the standards Document Summary page onthe ASTM website.3Plastics Pipe Institute 1825 Connecticut Ave NW Suite 680 Washington, DC200091Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.(multilayer pipe, fitting, valve, etc.) obt
17、aining by categorizingthe LTHSpin accordance with Table 2 of Specification D 2837.3.1.4 pressure rating (PR)the estimated maximum con-tinuous water pressure that the fitting is able of withstandingcontinuously with a high degree of certainty that failure of thefitting will not occur.3.1.4.1 Discussi
18、onThe PR and PDB are related by thefollowing equation:PR 5 PDB! DF! (1)3.1.5 service (design) factor (DF)a number less than 1.00(which takes into consideration all the variables and degree ofsafety involved in a thermoplastic pipe installation and ismultiplied by the HDB to give the HDS, or multipli
19、ed by thePDB to give the pressure rating.4. Significance and Use4.1 The procedure for establishing the long-term pressurerating of fittings starts with an extrapolation of a regression linethat is based on fitting failure data with respect to time, whenassemblies are tested in accordance with Test M
20、ethod D 1598.The pressure-versus time to failure data are obtained usingwater at 73F in assemblies that are immersed in a water or airenvironment. The extrapolation is made in such a manner thatthe long-term hydrostatic pressure rating is determined forthese conditions.4.2 The pressure design basis
21、is determined by consideringthe following items and evaluating them in accordance with6.3.4.2.1 Long-term hydrostatic pressure-strength at 100 000 h,4.2.2 Long-term hydrostatic pressure-strength at 50 years4.3 The fitting pressure rating may be calculated by multi-plying the pressure design basis (P
22、DB) by the appropriatedesign factor (DF).5. Test Specimen5.1 GeneralEach test specimen shall consist of a socket-end fitting. Fittings shall be representative of commercial partsand shall meet the requirements of D 2466 or D 2467. Pipestubs shall be solvent cemented into each socket and the endsof t
23、he stubs shall be closed with mechanical end-closures (orsolvent cement caps). At least one stub shall be fitted with apressure connection.5.2 Qualified DataIn order to be considered as a qualifieddata point, the failure must occur in the body of the fitting.However, as the testing proceeds data poi
24、nts resulting from thefailure of a solvent-cement joint qualify for use if those datapoints improve the scatter or the LTHSpintercept.NOTE 3If solvent-cement joint failures occur before the fittings fail,modify the curing procedure or cure time in order to eliminate or minimizethe joint failures.6.
25、Procedure6.1 GeneralGenerate data in accordance with TestMethod D 1598 Sections 6 Apparatus, 8. Conditioning and 9.Procedure. When any part of this test method is not inagreement with those sections of Test Method D 1598, theprovisions of this test method shall control.6.2 Pressure-versus Time DataO
26、btain a minimum of 18fitting-failure data points distributed as follows. Use water asthe test medium with an air or water environment.Hours Data points 10 At least 610 1000 At least 31000 - 6000 At least 3After 10,000 At least 16.3 Stress Rated PVC (Pressure-versus Time Data)If thefittings being eva
27、luated with this test method are all made fromPVC materials that have a long term strength listing in PPI TR4, the testing data requirements are as followsHours Data points 10 At least 310 1000 At least 31000 4000 At least 36000 + At least 16.4 Pressure Design Basisthe procedure for determiningthe P
28、DB shall be as follows:6.4.1 Calculate the hydrostatic pressure-strength at 100 000h (LTHSp) in accordance with section 5.2 of SpecificationD 2837.6.4.2 Calculate the hydrostatic pressure-strength at 50 yearsin accordance with 5.2.3.1 of Specification D 2837.6.4.3 Determine the pressure design basis
29、 (PDB) by catego-rizing, in accordance with Table 2 of Specification D 2837, theapplicable hydrostatic pressure-strength value as specifiedbelow:6.4.4 Use the LTHSpvalue (6.4.1) if it is less than 125 % ofthe 50-year value (6.4.2).6.4.5 Use the 50-year value if is less than 80 % of theLTHSpvalue.6.5
30、 LCL LimitCalculate the 100 000 h lower-confidencevalue in accordance with D 2837 Appendix X3. The lower-confidence value shall be at least 85 % of the LTHSpvalue.7. Report7.1 The report shall include the following:7.1.1 Complete identification of the sample, including fit-ting material type and gra
31、de, fitting manufacturers name, pipeand solvent cement used and joint cure time and temperature.7.1.2 Fitting size, pattern, schedule and ASTM Standardmarkings.7.1.3 Test temperature.7.1.4 Test environment inside and outside of the fitting.7.1.5 A table of the pressures in pounds-force per squareinc
32、h gage, the time-to-failure in hours for all the specimenstested (specimens that are designated as failures after they havebeen under pressure for more than 10 000 hours shall beindicated) and the nature and location of the failure.7.1.6 The estimated long-term hydrostatic pressure-strength,7.1.7 Th
33、e pressure design basis,7.1.8 Any unusual behavior observed in the tests,7.1.9 Dates of test, and7.1.10 Name of laboratory, location and supervisor of tests.F22610628. Precision and Bias8.1 No statement is made about either the precision or biasof Test Method F 2261 for establishing the Pressure Rat
34、ing ofthe sample tested or of other similar fittings since the resultmerely shows conformance with the criteria included in thistest method.9. Keywords9.1 PVC socket fittings; pressure rating; methodASTM International takes no position respecting the validity of any patent rights asserted in connect
35、ion with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsibl
36、e technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful cons
37、ideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 B
38、arr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).F2261063
