1、Designation: F1055 12 An American National StandardStandard Specification forElectrofusion Type Polyethylene Fittings for OutsideDiameter Controlled Polyethylene and CrosslinkedPolyethylene (PEX) Pipe and Tubing1This standard is issued under the fixed designation F1055; the number immediately follow
2、ing the designation indicates 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. Scope*1.1 This specificatio
3、n covers electrofusion polyethylene fit-tings for use with outside diameter-controlled polyethylenepipe, covered by Specifications D2513, D2737, D3035, andF714 and crosslinked polyethylene (PEX), covered by Speci-fication F2788. Requirements for materials, workmanship, andtesting performance are inc
4、luded. All requirements for joiningPE electrofusion fittings to PE pipe shall also apply to joiningPE electrofusion fittings to PEX pipe. Where applicable in thisspecification “pipe” shall mean “pipe” or “tubing.”1.2 The values stated in inch-pound units are to be regardedas standard. The values giv
5、en in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 The following safety hazards caveat pertains only to thetest method portion, Section 9, of this specification: Thisstandard does not purport to address all of the safet
6、y concerns,if any, associated with its use. It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.2. Referenced Documents2.1 ASTM Standards:2D638 Test Method for Tensile Propert
7、ies of PlasticsD1598 Test Method for Time-to-Failure of Plastic PipeUnder Constant Internal PressureD1599 Test Method for Resistance to Short-Time HydraulicPressure of Plastic Pipe, Tubing, and FittingsD1600 Terminology forAbbreviated Terms Relating to Plas-ticsD2513 Specification for Polyethylene (
8、PE) Gas PressurePipe, Tubing, and FittingsD2737 Specification for Polyethylene (PE) Plastic TubingD3035 Specification for Polyethylene (PE) Plastic Pipe (DR-PR) Based on Controlled Outside DiameterD3350 Specification for Polyethylene Plastics Pipe and Fit-tings MaterialsF412 Terminology Relating to
9、Plastic Piping SystemsF714 Specification for Polyethylene (PE) Plastic Pipe (DR-PR) Based on Outside DiameterF905 Practice for Qualification of Polyethylene Saddle-Fused JointsF1473 Test Method for Notch Tensile Test to Measure theResistance to Slow Crack Growth of Polyethylene Pipesand ResinsF2788
10、Specification for Metric-sized Crosslinked Polyethyl-ene (PEX) Pipe2.2 PPI Standards:3PPI TR-3 Policies and Procedures for Developing Hydro-static Design Basis (HDB), Pressure Design Basis (PDB),Strength Design Basis (SDB), and Minimum RequiredStrength (MRS) Rating for Thermoplastic Piping Materi-al
11、s or PipePPI TR-4 HDB/SDB/PDB/MRS Listed Materials, PPI List-ing of Hydrostatic Design Basis (HDB), Strength DesignBasis (SDB), and Minimum Required Strength (MRS)Rating for Thermoplastic Piping Materials or Pipe3. Terminology3.1 DefinitionsDefinitions are in accordance with Termi-nology F412, and a
12、bbreviations are in accordance with Termi-nology D1600, unless otherwise specified.3.2 Definitions of Terms Specific to This Standard:3.2.1 electrofusiona heat fusion joining process where theheat source is an integral part of the fitting, such that whenelectric current is applied, heat is produced
13、that melts and joinsthe plastics.1This specification is under the jurisdiction of ASTM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.10 on Fittings.Current edition approved Dec. 15, 2012. Published January 2013. Originallyapproved in 1987. Last previous
14、edition approved in 2011 as F1055 11. DOI:10.1520/F1055-12.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3A
15、vailable from Plastics Pipe Institute (PPI), 105 Decker Court, Suite 825,Irving, TX 75062, http:/www.plasticpipe.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.2.
16、2 fusion interfacesurface in the heat fusion processwhere the plastic materials of the products being joined bondtogether.3.2.3 fusion zone lengthtotal length of the melted materialin the fitting cross-section under evaluation.4. Materials and Manufacture4.1 This specification covers fittings made f
17、rom polyethyl-ene compounds as defined in Specification D3350.4.1.1 Polyethylene material compounds suitable for use inthe manufacture of electrofusion fittings under this specifica-tion shall meet Specification D3350 and shall meet Specifica-tion D3350 classification and property requirements shown
18、 inTable 1 and shall have PPI TR-4 HDB and HDS listings at73F (23C) and HDB listings at 140F (60C).4.2 Rework MaterialClean rework polyethylene materialof the same resin, free of any wire or contaminants generatedfrom the fitting manufacturers own production, may be usedby the same manufacturer, as
19、long as the fittings producedconform to the requirements of this specification.4.3 Heating MechanismThe heat mechanism shall be ofmaterials not detrimental to the performance of the fitting orthe pipe to which it is intended to be joined.5. Performance Requirements5.1 The following requirements are
20、for electrofusion jointsthat have been joined using the manufacturers recommendedjoining procedures. These requirements must be met by eachelectrofusion joint design, on each size and type of pipematerial for which the manufacturer recommends use of hisfitting. Any revisions to the electrofusion joi
21、nt design orprocessing by the manufacturer after the initial testing requiresretesting to ensure these requirements can still be met. Fittingsintended for use in the distribution of natural gas or liquidpetroleum gas shall also meet the requirements of SpecificationD2513.5.1.1 It is not required tha
22、t each configuration of a fitting betested to meet all of these qualifications (that is, 2 in. mainsaddle joint with multiple outlet configurations offered) as longas the electrofusion joint design is not altered in the configu-ration differences.NOTE 1It is permissible when accomplishing these test
23、s, to do so onthe highest and lowest dimension ratio of the same pipe material. If inthose tests all performance requirements are met, all dimension ratiosbetween those tested may be considered as having met the requirements.These tests do not have to cover the full range of dimension ratiosavailabl
24、e, only the dimension ratio range on which the manufacturerrecommends his fitting be used.5.2 Pressure Requirements:5.2.1 Minimum Hydraulic Burst PressureThe fitting andfused joint shall not fail when tested in accordance with 9.1.The minimum hydraulic burst pressure of the test specimenshall not be
25、 less than that required to produce the minimumfiber stress in the pipe as required by the controlling pipestandard for the type of pipe used in the test. In no case shallthe minimum hydraulic burst pressure be less than that requiredto produce 2520 psi (17.4 MPa) fiber stress in the pipe formedium
26、density PE (density cell 2) and 2900 psi (20 MPa)fiber stress in the pipe for high density PE (density cell 3 or 4)test specimens when tested in accordance with 9.1. The testequipment, procedures, and failures definitions shall be asspecified in Test Method D1599.5.2.2 Sustained PressureThe fitting
27、and fused joint shallnot fail when tested in accordance with 9.2. The test pressure,minimum time-to-failure, and test temperature shall be asrequired by the controlling pipe standard for the type of pipeused in the test. If a pipe standard is not specified, or does notcontain test requirements, the
28、test pressure, minimum time-to-failure and test temperature shall be as shown in Table 2.5.3 Tensile Strength Requirements (Coupling Type JointsOnly)The fitting or the pipe to fitting joint made on pipe shallnot fail when tested in accordance with 9.3. Specimens shall besubjected to a tensile stress
29、 that causes the pipe to yield to anelongation no less than 25 % or causes the pipe to breakoutside the joint area. Tensile tests must be made on specimensas joined, not on straps cut from the specimen. Yielding mustbe measured only in the pipe, independent of the fitting or joint.5.4 Impact Resista
30、nce (Saddle Type Joints Only)The jointmade on the specimen shall not fail when impacted with a forcesufficient to break the body or other portion of the specimen.Tests of 500 ftlbf or higher impact with no failures noted shallbe considered as a “pass” impact test. The device for testingand the metho
31、ds shall be as defined in Practice F905.5.5 Joint Integrity Tests(Couplings and Saddle TypeJoints)The joint made on the specimen shall meet therequirements in 9.4 and 9.5 of this specification, when tested inaccordance with 9.4.6. Dimensions, Mass, and Permissible Variations6.1 Dimension and toleran
32、ces of electrofusion fittings mustbe such that heat fusion is possible to outside diameter (OD)controlled PE pipes such as those listed in SpecificationsD2513, D2737, D3035, and F714 and PEX pipes listed inSpecification F2788, such that the joints will satisfy theperformance requirements in Section
33、5.6.2 Because of the varying designs for electrofusion fittings,the actual spread of dimensions may be quite different frommanufacturer to manufacturer. A table of dimensions andTABLE 1 Specification D3350 Classification Requirements ofPolyethylene Electrofusion Fitting MaterialsPhysical PropertiesC
34、ell Classification and Properties for PolyethyleneMaterialsPE2708 PE4710Density 2 4Melt Index 3 or 4 4Flexural Modulus $4 $5Tensile Strength $3 $4Slow Crack Growth Re-sistance (F1473)77Hydrostatic StrengthClassification34Color and UV Stabilizer C or E C or EHDB at 73F (23C), psi(MPa)1250 (8.62) 1600
35、 (11.03)F1055 122tolerances encompassing these differences would be meaning-less and without value and, therefore, is omitted from thisspecification.6.3 The manufacturer shall furnish to the user the electricalresistance, critical dimensions, and tolerances of his fittings.This information must incl
36、ude at least the following dimen-sions and tolerances:6.3.1 Coupling inside diameter,6.3.2 Temperature joining limits, and6.3.3 Operating pressure of the fitting.NOTE 2There are other items that fall beyond the scope of thisspecification which would be of interest to the user for proper applicationo
37、f the fittings and is recommended as additional information to befurnished. A few of these are: (1) maximum pipe out of round allowed atjoint area; (2) minimum/maximum pipe SDR capability of the fitting, and(3) for saddles intended for use on a live main, the maximum allowableline pressure when maki
38、ng the joint.7. Workmanship, Finish, and Appearance7.1 The manufacture of these fittings shall be in accordancewith good commercial practice so as to produce fittingsmeeting the requirements of this specification.7.2 The fittings shall be homogeneous throughout, exceptwhere a heating coil or electri
39、cal connectors are incorporated,and free of cracks, holes, foreign inclusions, or injuriousdefects such as gouges, dents, cuts, etc. The fittings shall be asuniform as commercially practicable in opacity, density, andother physical properties.Any heating coils, connecting cables,connectors, and rela
40、ted electrical power source shall be de-signed to prevent electrical shock to the user.8. Specimen Preparation8.1 Conditioning:8.1.1 Unless otherwise specified, condition the specimens(pipe and fittings) prior to joining at the minimum pipetemperature allowable for fusion as recommended by themanufa
41、cturer, for not less than 16 h and make the fusion jointat that temperature for those tests where conditioning isrequired.8.1.2 Unless otherwise specified, condition the specimens(pipe and fittings) prior to joining at the maximum pipetemperature allowable for fusion as recommended by themanufacture
42、r, for not less than 16 h and make the fusion jointat that temperature for those tests where conditioning isrequired.8.2 Test ConditionsConduct the tests at the StandardLaboratory Temperature of 23 6 2C (73.4 6 3.6F) unlessotherwise specified.8.3 Preparation of Specimens for Testing:8.3.1 Prepare te
43、st specimens so that the minimum length ofunreinforced pipe on one side of any fitting is equal to threetimes the diameter of the pipe, but in no case less than 12 in.(304 mm). It is permissible to test multiple fittings togetherprovided they are separated by a minimum distance equal tothree times t
44、he diameter of the pipe, but in no case less than 12in. (304 mm).8.3.2 Fuse all fitting outlets with the appropriate size pipe inaccordance with the manufacturers recommended procedures.8.3.3 All saddle fusion joint specimens conditioned as in8.1.2 and destined for quick burst testing as in 9.1 ands
45、ustained pressure testing as in 9.2, are to be joined with thepipe at no less than maximum allowable operating pressure ofthe pipe system or fitting, whichever is lowest, when beingprepared for those tests. The pipe should be left under pressureTABLE 2 Supplemental Sustained Pressure Test Requiremen
46、ts for the Pipe Material Being TestedPE2408, PE2706, PE2708 PE3408, PE3608, PE3708, PE3710, PE4708,PE4710Condition Test Temperature C(F)ATest Pressure HoopStresspsiB(kPa)AMinimum Average TimeBefore Failure HoursTest Pressure HoopStresspsiB(kPa)AMinimum Average TimeBefore Failure Hours1 80 (176) 670
47、(4620) 170 750 (5170) 2002 80 (176) 650 (4480) 340 730 (5020) 4003 80 (176) 630 (4345) 510 705 (4870) 6004 80 (176) 610 (4210) 680 685 (4715) 8005 80 (176) 590 (4070) 850 660 (4565) 10006 80 (176) 580 (4000) 1000 640 (4415) 1200ATest temperature tolerance2C(3.6F). Test pressure tolerance 5 psi ( 35
48、kPa); test pressure hoop stress values are rounded to the nearest 5 psi or 5 kPa.Table 2 conditions are based on PE validation requirements per PPI TR-3 with Condition 6 being 85% of Condition 1 hoop stress and six times greater minimum averagetime before failure. Conditions 2 through 5 are linear s
49、tress and time interpolations between Condition 1 and 6. The intent of multiple conditions is to maintain equivalentperformance criteria, but provide for retest in the event of a ductile failure. The test pressure hoop stress levels for Conditions 2-5 are linear interpolations for arbitrarilychosen time increments. An equivalent performance requirement, however, may be determined by arbitrarily choosing a test pressure hoop stress between Conditions 1and 6 and linearly interpolating the minimum average time before failure. For example for PE4710
