1、Designation: D3261 10An American National StandardStandard Specification forButt Heat Fusion Polyethylene (PE) Plastic Fittings forPolyethylene (PE) Plastic Pipe and Tubing1This standard is issued under the fixed designation D3261; the number immediately following the designation indicates the year
2、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.This standard has been approved for use by agencies of the Department
3、 of Defense.1. Scope*1.1 This specification covers polyethylene (PE) butt fusionfittings for use with polyethylene pipe (IPS and ISO) andtubing (CTS). Included are requirements for materials, work-manship, dimensions, marking, sustained pressure, and burstpressure.1.2 The values stated in inch-pound
4、 units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.2. Referenced Documents2.1 ASTM Standards:2D1598 Test Method for Time-to-Failure of Plastic PipeUnder Constant Internal
5、PressureD1599 Test Method for Resistance to Short-Time HydraulicPressure of Plastic Pipe, Tubing, and FittingsD1600 Terminology for Abbreviated Terms Relating toPlasticsD2122 Test Method for Determining Dimensions of Ther-moplastic Pipe and FittingsD2513 Specification for Polyethylene (PE) Gas Press
6、urePipe, Tubing, and FittingsD3350 Specification for Polyethylene Plastics Pipe andFittings MaterialsF412 Terminology Relating to Plastic Piping Systems2.2 Federal Standard:Fed. Std. No. 123 Marking for Shipment (Civil Agencies)32.3 Military Standard:MIL-STD-129 Marking for Shipment and Storage32.4
7、National Sanitation Foundation Standard:Standard No. 14 for Plastic Piping Components and RelatedMaterials42.5 Plastic Pipe Institute5PPI TR-3 Policies and Procedures for Developing Hydro-static Design Basis (HDB), Pressure Design Basis (PDB),Strength Design Basis (SDB), and Minimum RequiredStrength
8、 (MRS) Ratings for Thermoplastic Piping Mate-rials or Pipe7PPI TR-4 HDB/SDB/PDB/MRS Listed Materials, PPI List-ing of Hydrostatic Design Basis (HDB), Strength DesignBasis (SDB), Pressure Design Basis (PDB), and MinimumRequired Strength (MRS) Ratings for Thermoplastic Pip-ing Materials or Pipe3. Term
9、inology3.1 Definitions are in accordance with Terminology F412and abbreviations are in accordance with Terminology D1600,unless otherwise specified.3.2 dimension ratio (DR) for thermoplastic pipethe ratioof diameter to wall thickness. For this specification it iscalculated by dividing the specified
10、outside diameter by thespecified wall thickness of the fitting at its area of fusion. DRsare rounded and do not calculate exactly.4. Classification4.1 GeneralThis specification covers butt fusion fittingsintended for use with polyethylene pipe and tubing.4.1.1 Fittings covered by this specification
11、are normallymolded. Fittings may be machined from extruded or moldedstock.4.1.2 Fittings fabricated by thermal welding are not in-cluded in this specification.1This specification is under the jurisdiction of ASTM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee
12、 F17.10 on Fittings.Current edition approved March 1, 2010. Published April 2010. Originallyapproved in 1973. Last previous edition approved in 2003 as D3261 03. DOI:10.1520/D3261-10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.
13、org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http:/dodssp.daps.dla.mil.4Available from NSF Inte
14、rnational, P.O. Box 130140, 789 N. Dixboro Rd., AnnArbor, MI 48113-0140, http:/www.nsf.org.5Available from Plastics Pipe Institute (PPI), 105 Decker Court, Suite 825,Irving, TX 75062, http:/www.plasticpipe.org.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM Internat
15、ional, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.1.3 Fittings intended for use in the distribution of naturalgas or petroleum fuels shall also meet the requirements ofSpecification D2513.5. Ordering Information5.1 When ordering fittings under this specific
16、ation, thefollowing should be specified:5.1.1 Polyethylene compound (material designation or tradename)5.1.2 Style of fitting (tee, 90 ell, and the like)5.1.3 Size:5.1.3.1 Nominal diameter.5.1.3.2 CTS, IPS, or schedule.5.1.3.3 Dimension ratio number or schedule number.6. Materials6.1 Polyethylene Co
17、mpoundPolyethylene material com-pounds suitable for use in the manufacture of fittings under thisspecification shall meet Specification D3350 and shall meet theSpecification D3350 classification and property requirementsinTable 1 and shall have PPI TR-4 HDB and HDS listings at73F (23C) and HDB listi
18、ngs 140F (60C) in accordancewith Table 1.6.2 Color and Ultraviolet (UV) StabilizationPolyethylenematerial compounds shall meet Specification Table 1 code C orE. Code C material compounds shall have 2 to 3 percent carbonblack. Code E material compounds shall be colored with UVstabilizer.6.3 Rework Ma
19、terialClean polyethylene compound fromthe manufacturers own production that met 6.1 and 6.2 asvirgin material is suitable for remolding into fittings, eitheralone or blended with new compound of the same cellclassification or material designation. Fittings containing therework material shall meet th
20、e material and product require-ments of this specification.7. Requirements7.1 Dimensions and Tolerances:7.1.1 Outside DiameterNominal outside diameters of buttfusion fittings shall conform to the nominal iron pipe size (IPS)or copper tubing size (CTS) dimensions at area of fusion.These dimensions an
21、d tolerances shall be as shown in Table 2and Table 3 of this specification.7.1.2 Inside Diameter (CTS Fittings Only)Inside diam-eters of butt fusion fittings for tubing at area of fusion shallconform to the dimensions of the tubing being joined. Thedimensions and tolerances for the fittings are show
22、n in Table 4.7.1.3 Wall ThicknessThe wall thicknesses of butt fusionfittings shall not be less than the minimum specified for thepipe or tubing. The wall thicknesses and tolerances at the areaof fusion shall be as shown in Table 4, Table 5 and Table 6 ofthis specification.7.1.4 MeasurementsThese sha
23、ll be made in accordancewith Test Method D2122 for roundable pipe.7.1.5 Design DimensionsOverall fitting dimensions maybe as preferred from a design standpoint by the manufacturerand accepted by the purchaser consistent with 7.1.3.7.1.6 Special Sizes Where existing system conditions orspecial local
24、requirements make other diameters or dimensionratios necessary, other sizes or dimension ratios, or both, shallbe acceptable for engineered applications when mutuallyagreed upon by the customer and the manufacturer, if the fittingis manufactured from plastic compounds meeting the materialrequirement
25、s of this specification, and the strength and designrequirements are calculated on the same basis as those used inTABLE 1 Specification D3350 Classification of Polyethylene Fittings MaterialsPhysical Properties Cell Classification and Properties for Polyethylene Pipe MaterialsPE2606 PE2706 PE2708 PE
26、3608 PE3708 PE3710 PE4708 PE4710Density 22233 3 4 4Melt Index 3 or 4 3 or 4 3 or 4 4 4 4 4 4Flexural modulus $4 $4 $4 $4 $4 $4 $4 $5Tensile Strength $3 $3 $3 $4 $4 $4 $4 $4Slow crack growth resistance (F1473) 67767 7 7 7Hydrostatic strength classification 33344 4 4 4Color and UV StabilizerACorE CorE
27、 CorE CorE CorE CorE CorE CorEHDB at 140F (60C), PPI TR-4, psi (MPa)BBBBB B B BHDB at 73F (23C), PPI TR-4, psi (MPa) 630 (4.34) 630 (4.34) 800 (5.52) 800 (5.52) 800 (5.52) 1000 (6.90) 800 (5.52) 1000 (6.90)ASee 6.2.BListing required; consult manufacturer for listed value.TABLE 2 IPS Sizing System Ou
28、tside Diameters and Tolerancesfor Fittings for Use with Polyethylene Pipe, in.Nominal PipeSizeAverage OutsideDiameter at Area ofFusionATolerance12340.8401.05060.00860.0081 1.315 60.010114 1.660 60.010112 1.900 60.0102 2.375 60.0103 3.500 60.0124 4.500 60.0156 6.625 60.0188 8.625 60.02510 10.750 60.0
29、2712 12.750 60.03614 14.000 60.06316 16.000 60.07218 18.000 60.08120 20.000 60.09021.5 21.500 60.09722 22.000 60.09924 24.000 60.10828 28.000 60.12632 32.000 60.14436 36.000 60.16242 42.000 60.18948 48.000 60.216ADefined as measured14 to12 in. (6.4 to 12.7 mm) from fitting outlet extremity.D3261 102
30、this specification. For diameters not shown in Table 2 or Table3, the tolerance shall be the same percentage as that shown inthe corresponding tables for the next smaller listed size.Minimum wall thickness for these special sizes shall not be lessthan the minimum wall specified for the pipe or tubin
31、g thefitting is designed to be used with. The maximum wallthickness allowed shall not be greater than 20 % thicker thanthe specified minimum wall, and shall be determined by 10.4.3of this specification.7.2 Pressure Test Requirements:7.2.1 Short-Term Rupture Strength for Fittings12 to 12 in.and 90 to
32、 315 mm, Nominal DiameterThe minimum short-term rupture strength of the fitting and fused pipe or tubingshall not be less than the minimum short-term rupture strengthof the pipe or tubing in the system when tested in accordancewith 10.5.3. These minimum pressures shall be as shown inTable 7 of this
33、specification. Test specimens shall be preparedfor testing in the manner described in 10.5.1 of this specifica-tion. The test equipment, procedures, and failures definitionsshall be as specified in Test Method D1599.7.2.2 Short-Term Strength for Fittings 14 to 48 in. and 355to 1600 mm, Nominal Diame
34、terFittings shall not fail whentested in accordance with 10.5.3. The minimum pressure shallbe as shown in Table 7 of this specification. Test specimensshall be prepared for testing in the manner described in 10.2 ofthis specification. The test equipment and procedures shall beas specified in Test Me
35、thod D1599.7.2.3 Sustained PressureThe fitting and fused pipe ortubing shall not fail, as defined in Test Method D1598, whentested at the time, pressures, and test temperatures selectedfrom test options offered in Table 8. The test specimens shall beprepared for testing in the manner prescribed in 1
36、0.5.1.8. Workmanship, Finish, and Appearance8.1 The manufacture of these fittings shall be in accordancewith good commercial practice so as to produce fittingsmeeting the requirements of this specification. Fittings shall behomogeneous throughout and free of cracks, holes, foreigninclusions, or othe
37、r injurious defects. The fittings shall be asuniform as commercially practicable in color, opacity, density,and other physical properties.9. Sampling9.1 Parts made for sale under this specification should besampled at a frequency appropriate for the end use intended.When the fittings are to be insta
38、lled under a system specifica-tion (such as Specification D2513 for gas), the minimumrequirements of that specification must be satisfied.10. Test Methods10.1 GeneralThe test methods in this specification coverfittings to be used with pipe and tubing for gas, water, and otherengineered piping system
39、s. Test methods that are applicablefrom other specifications will be referenced in the paragraphpertaining to the particular test. Certain special test methodsapplicable to this specification only are explained in theappropriate paragraph.10.2 ConditioningUnless otherwise specified, conditionthe spe
40、cimens prior to test at 73.4 6 3.6F (23 6 2C) for notless than6hinair,or1hinwater, for those tests whereconditioning is required and in all cases of disagreement.Newly molded fittings shall be conditioned 40 h prior to test.10.3 Test ConditionsConduct the tests at the standardlaboratory temperature
41、of 73.4 6 3.6F (23 6 2C) unlessotherwise specified.10.4 Dimensions and Tolerances:10.4.1 Outside DiameterMeasure the outside diameterof the fittings at the area of fusion in accordance with the WallThickness section of Method D2122 by use of a circumferen-tial tape readable to the nearest 0.001 in.
42、(0.02 mm).10.4.2 Inside Diameter (CTS Fittings Only)Use a steppedplug gage to determine the inside diameter of the CTS end ofthe fitting. The plug gage shall be of the go/no go type and shallhave12-in. (12.7-mm) land lengths cut to the minimum insidediameter and maximum inside diameter. A fitting is
43、 unaccept-able (no go) if it fits snugly on the minimum inside diameterland of the gage or if it fits loosely on the maximum diameterland of the gage.10.4.3 Wall ThicknessMake a series of measurementsusing a cylindrical anvil tubular micrometer or other accuratedevice at closely spaced intervals to
44、ensure that minimum andmaximum wall thicknesses to the nearest 0.001 in. (0.02 mm)have been determined. Make a minimum of six measurementsat each cross section.10.5 Pressure Testing:10.5.1 Preparation of Specimens for Pressure TestingPrepare test specimens in such a manner that each, whetherindividu
45、al fittings or groups of fittings, is a system incorporat-ing at least one length of pipe or tubing. Fuse all fitting outletswith the appropriate size pipe or tubing. At least one piece ofpipe or tubing in the system shall have a minimum length equalto five pipe diameters.10.5.2 Sustained Pressure T
46、est:10.5.2.1 Sustained pressure tests shall be conducted inaccordance with Table 8 and Test Method D1598 using wateras the pressurizing medium. The “test sample” shall be threeTABLE 3 ISO Sizing System (ISO 161/1) Outside Diameters andTolerances for Fit for Use with Polyethylene Pipe, mmNominal Pipe
47、SizeAverage Outside Diameter at Area of FusionMin MaxA90 90.0 90.8110 110.0 111.0160 160.0 161.4200 200.0 201.8250 250.0 252.3280 280.0 282.5315 315.0 317.8355 355.0 358.2400 400.0 403.6450 450.0 454.1500 500.0 504.5560 560.0 565.0630 630.0 635.7710 710.0 716.4800 800.0 807.2900 900.0 908.11000 1000
48、.0 1009.01200 1200.0 1210.81400 1400.0 1412.61600 1600.0 1614.4ASpecified in ISO 3607.D3261 103specimens. Select one Table 8Condition for the materialdesignation and test the three specimen test sample.10.5.2.2 Passing results are: (a) non-failure for all threespecimens at a time equal to or greater
49、 than the “minimumaverage time before failure”, or (b) not more than one ductilespecimen failure and the average time before failure for allthree specimens shall be greater than the specified “minimumaverage time before failure” for the selected Table 8 Condition.For Table 8 Conditions 1 through 5: if more than one ductilefailure occurs before the “minimum average time beforefailure”, it is permissible to conduct one retest at a Table 8Condition of lower stress and longer minimum average timebefore failure for the material designation.
