1、Designation: F2261 06 (Reapproved 2011)An American National StandardStandard Test Method forPressure Rating Poly(Vinyl Chloride) (PVC) Plastic PipeFittings, Schedule 40 and 80 Socket-Type.1This standard is issued under the fixed designation F2261; the number immediately following the designation ind
2、icates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers a procedure for e
3、stablishingPressure Rating for PVC schedule 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 p
4、ressure rating to that product or sample of 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, an
5、d where thelower confidence level limits are not met the data shall beclassified as unsuitable. (See Note 1)NOTE 1This test method is similar to that used in Test Method D2837,which has been used for about 30 years to establish the HDS of plasticpipe materials and is the basis for all pressure ratin
6、gs assigned to plasticpipes.1.3 The products covered by this test method are schedule40 or 80 molded PVC fittings that conform to SpecificationsD2466 or D2467.1.4 The pressure ratings developed using this test methodapplies only to fittings identical to the ones that were tested.Some variables that
7、will affect the pressure rating are pipesize, 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 conside
8、red standard.1.6 The testing procedure used to obtain the fitting failuredata shall be as described in those sections of Test MethodD1598, 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
9、at 73F. Whenappropriate, the design engineer 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.
10、 It is theresponsibility of the user of 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 s
11、afetyhazards should a system fail for any reason.2. Referenced Documents2.1 ASTM Standards:2D1598 Test Method for Time-to-Failure of Plastic PipeUnder Constant Internal PressureD2466 Specification for Poly(Vinyl Chloride) (PVC) PlasticPipe Fittings, Schedule 40D2467 Specification for Poly(Vinyl Chlo
12、ride) (PVC) PlasticPipe Fittings, Schedule 80D2837 Test Method for Obtaining Hydrostatic Design Basisfor Thermoplastic Pipe Materials or Pressure Design Basisfor Thermoplastic Pipe Products2.2 Other Standards:PPI Report TR-4 HDB/SDB/PDB/MRS Listed Materi-als33. Terminology3.1 Definitions of Terms Sp
13、ecific to This Standard:3.1.1 failurethe 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 w
14、ill cause failure of the fitting at 100 000h. This is the intercept of the pressure regression line with the100 000-h intercept.1This test method is under the jurisdiction of ASTM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.40 on TestMethods.Current ed
15、ition approved Oct. 1, 2011. Published December 2011. Originallyapproved in 2006. Last previous edition approved in 2006 as F226106 DOI:10.1520/F2261-06R11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of AST
16、MStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from Plastics Pipe Institute (PPI), 105 Decker Court, Suite 825,Irving, TX 75062, http:/www.plasticpipe.org.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken,
17、PA 19428-2959, United States.3.1.3 pressure design basis (PDB)one of a series ofestablished pressure values for plastic piping components(multilayer pipe, fitting, valve, etc.) obtaining by categorizingthe LTHSpin accordance with Table 2 of Specification D2837.3.1.4 pressure rating (PR)the estimated
18、 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 DiscussionThe PR and PDB are related by thefollowing equation:PR 5 PDB! DF! (1)3.1.5 service (design) factor (DF)a number less th
19、an 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 multiplied by thePDB to give the pressure rating.4. Significance and Use4.1 The procedure for establishing the long-term pressure
20、rating 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 Method D1598.The pressure-versus time to failure data are obtained usingwater at 73F in assemblies that are immersed in a
21、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 is determined by consideringthe following items and evaluating them in accordance with6.3.4.2.1 Long-term hydrostatic pres
22、sure-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 (PDB) by the appropriatedesign factor (DF).5. Test Specimen5.1 GeneralEach test specimen shall consist of a socket-end fitti
23、ng. Fittings shall be representative of commercial partsand shall meet the requirements of D2466 or D2467. Pipe stubsshall be solvent cemented into each socket and the ends of thestubs shall be closed with mechanical end-closures (or solventcement caps). At least one stub shall be fitted with a pres
24、sureconnection.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 points resulting from thefailure of a solvent-cement joint qualify for use if those datapoints improve the scatter or the LTHSp
25、intercept.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. Procedure6.1 GeneralGenerate data in accordance with TestMethod D1598 Sections 6 Apparatus, 8. Conditioning and 9.Procedure.
26、 When any part of this test method is not inagreement with those sections of Test Method D1598, theprovisions of this test method shall control.6.2 Pressure-versus Time DataObtain a minimum of 18fitting-failure data points distributed as follows. Use water asthe test medium with an air or water envi
27、ronment.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 evaluated with this test method are all made fromPVC materials that have a long term strength listing in PPI TR4, the testing dat
28、a 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 PDB shall be as follows:6.4.1 Calculate the hydrostatic pressure-strength at 100 000h (LTHSp) in accordance with section 5.2 of
29、 SpecificationD2837.6.4.2 Calculate the hydrostatic pressure-strength at 50 yearsin accordance with 5.2.3.1 of Specification D2837.6.4.3 Determine the pressure design basis (PDB) by catego-rizing, in accordance with Table 2 of Specification D2837, theapplicable hydrostatic pressure-strength value as
30、 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 LCL LimitCalculate the 100 000 h lower-confidencevalue in accordance with D2837 Appendix X3. The lower-confidence value shall be
31、 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 grade, fitting manufacturers name, pipeand solvent cement used and joint cure time and temperature.7.1.2 Fitting size, pattern, sched
32、ule 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 squareinch gage, the time-to-failure in hours for all the specimenstested (specimens that are designated as failures after they havebeen un
33、der 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 The 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, locati
34、on and supervisor of tests.F2261 06 (2011)28. Precision and Bias8.1 No statement is made about either the precision or biasof Test Method F2261 for establishing the Pressure Rating ofthe sample tested or of other similar fittings since the resultmerely shows conformance with the criteria included in
35、 thistest method.9. Keywords9.1 PVC socket fittings; pressure rating; methodASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validit
36、y 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 responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comment
37、s are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not
38、 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 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copi
39、es) 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).F2261 06 (2011)3
