1、Designation: F1055 16Standard 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 following the designation indicates
2、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 specification covers electrofusion polyeth
3、ylene fit-tings for use with outside diameter-controlled polyethylenepipe, covered by Specifications D2513, D2737, D3035, andF714 and crosslinked polyethylene (PEX), covered by Speci-fications F876 and F2788/F2788M. Requirements formaterials, workmanship, and testing performance are included.All req
4、uirements for joining PE electrofusion fittings to PEpipe shall also apply to joining PE electrofusion fittings to PEXpipe. Where applicable in this specification “pipe” shall mean“pipe” or “tubing.”1.2 The values stated in inch-pound units are to be regardedas standard. The values given in parenthe
5、ses 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 safety concerns,if
6、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 Properties of Plastic
7、sD1598 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 (PE) Gas Pressu
8、rePipe, 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 Plastic Piping
9、 SystemsF714 Specification for Polyethylene (PE) Plastic Pipe (DR-PR) Based on Outside DiameterF876 Specification for Crosslinked Polyethylene (PEX) Tub-ingF905 Practice for Qualification of Polyethylene Saddle-Fused JointsF1473 Test Method for Notch Tensile Test to Measure theResistance to Slow Cra
10、ck Growth of Polyethylene Pipesand ResinsF2788/F2788M Specification for Metric and Inch-sizedCrosslinked Polyethylene (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 Req
11、uiredStrength (MRS) Rating for Thermoplastic Piping Materi-als 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 Pipe2.3 ISO Standards:4ISO 1395
12、4 Plastics pipe and fittings Peel decohesion testfor polyethylene (PE) electrofusion assemblies of nominaldiameter greater than or equal to 90 mm1This specification is under the jurisdiction of ASTM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.10 on Fit
13、tings.Current edition approved Aug. 1, 2016. Published September 2016. Originallyapproved in 1987. Last previous edition approved in 2015 as F1055 15. DOI:10.1520/F1055-16.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For An
14、nual Book of ASTMStandards 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.4Available from International Organization for Standardization (ISO),
15、ISOCentral Secretariat, BIBC II, Chemin de Blandonnet 8, CP 401, 1214 Vernier,Geneva, Switzerland, http:/www.iso.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. T
16、erminology3.1 DefinitionsDefinitions are in accordance with Termi-nology F412, and abbreviations 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 integr
17、al part of the fitting, such that whenelectric current is applied, heat is produced that melts and joinsthe plastics.3.2.2 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 materi
18、alin the fitting cross-section under evaluation.4. Materials and Manufacture4.1 This specification covers fittings made from polyethyl-ene compounds as defined in Specification D3350.4.1.1 Polyethylene material compounds suitable for use inthe manufacture of electrofusion fittings under this specifi
19、ca-tion shall meet Specification D3350 and shall meet Specifica-tion D3350 classification and property requirements shown 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
20、any wire or contaminants generatedfrom the fitting manufacturers own production, may be usedby the same manufacturer, as long as the fittings producedconform to the requirements of this specification.4.3 Heating MechanismThe heat mechanism shall be ofmaterials and design not detrimental to the perfo
21、rmance of thefitting or the pipe to which it is intended to be joined. Heatingmechanisms, such as wires or materials other thanpolyethylene, shall not exit the fitting in an area exposed tointernal pressure. Heat mechanisms shall be of a design thatensures that wire terminations are toward the outer
22、 edges of thefusion zone length and away from the pressure containing area.Examples of acceptable and unacceptable wire terminations areshown in Figs. 1-5.4.4 Removal of exterior layersFor PEX pipes containingan exterior non-PEX layer, such layers shall be completelyremoved according to the manufact
23、urers instructions prior tomaking the electrofusion joint. The dimensions of the PEXpipe after removal of non-PEX exterior layer/s shall meet therequirements of the relevant tubing or pipe Specifications F876or F2788/F2788M.4.5 PEX pipe utilizing a mid-wall non-PEX layer areoutside the scope of this
24、 standard and therefore shall not beused to qualify fittings to this standard.5. Performance Requirements5.1 The following requirements are for electrofusion jointsthat have been joined using the manufacturers recommendedjoining procedures. These requirements must be met by eachelectrofusion joint d
25、esign, on each size and type of pipeTABLE 1 Specification D3350 Classification Requirements ofPolyethylene Electrofusion Fitting MaterialsPhysical PropertiesCell Classification and Properties for PolyethyleneMaterialsPE2708 PE4710Density 2 4Melt Index 3 or 4 4Flexural Modulus $4 $5Tensile Strength $
26、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 (11.03)FIG. 1 Correct Wire Termination CouplingSingle CoilFIG. 2 Correct Wire Termination CouplingDual CoilFIG. 3 Correct Wire TerminationSad
27、dle FittingF1055 162material for which the manufacturer recommends use of hisfitting. Any revisions to the electrofusion joint design orprocessing by the manufacturer after the initial testing requiresretesting to ensure these requirements can still be met. Fittingsintended for use in the distributi
28、on of natural gas or liquidpetroleum gas shall also meet the requirements of SpecificationD2513.5.1.1 Assemblies using PEX pipes joined with electrofusionfittings shall be limited to the HDS rating of the PE material ofthe fitting as per 4.1.1 with a maximum usage temperature of140F.5.1.2 Assemblies
29、 using PEX pipes joined with electrofusionfittings shall not be used for distribution of natural gas or liquidpetroleum gas.5.1.3 It is not required that each configuration of a fitting betested to meet all of these qualifications (that is, 2 in. mainsaddle joint with multiple outlet configurations
30、offered) as longas the electrofusion joint design is not altered in the configu-ration differences.NOTE 1It is permissible when accomplishing these tests, to do so onthe highest and lowest dimension ratio of the same pipe material. If inthose tests all performance requirements are met, all dimension
31、 ratiosbetween those tested may be considered as having met the requirements.These tests do not have to cover the full range of dimension ratiosavailable, only the dimension ratio range on which the manufacturerrecommends his fitting be used.5.2 Pressure Requirements:5.2.1 Minimum Hydraulic Burst Pr
32、essureThe fitting andfused joint shall not fail when tested in accordance with 9.1.The minimum hydraulic burst pressure at 73F (23C) of thetest specimen shall not be less than that required to produce theminimum fiber stress in the pipe as required by the controllingpipe standard for the type of pip
33、e used in the test. In no caseshall the minimum hydraulic burst pressure be less than thatrequired to produce 2520 psi (17.4 MPa) fiber stress in the pipefor medium 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
34、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 and fused joint shallnot fail when tested in accordance with 9.2. The test pressure,minimum time-to-failure, and test temperature shall
35、 be asrequired by the controlling pipe standard for the type of pipeused in the test. Where the controlling pipe standard requirestesting at multiple temperatures, sustained pressure testingshall only be performed at the highest test temperature, not toexceed 180F (82C). If a pipe standard is not sp
36、ecified, ordoes not contain test requirements, the test pressure, minimumtime-to-failure and test temperature shall be as shown in Table2.5.3 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
37、. Specimens shall besubjected to a tensile stress 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, indep
38、endent of the fitting or joint.5.3.1 Equipment needed to conduct full scale tensile testsfor sizes 8 IPS and larger is not readily available; therefore, anoptional alternative to full-scale tensile tests for coupling-typejoints 8 IPS and larger is included as mandatory information inAnnex A2. The te
39、sts performed in Annex A2 qualifies thefitting design in lieu of tensile strength requirements testing of5.3 and the joint crush test portion of 5.5. All other perfor-mance requirements in Section 5 shall be satisfied by testing tothe requirements using the methods described in Section 9.5.4 Impact
40、Resistance (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 th
41、e methods 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 9.4.5.5.1 Equipment needed to perform crush testing to theprocedure d
42、escribed in 9.4.1 for sizes 8 IPS and larger is notreadily available, or can be hazardous to operate safely;FIG. 4 Incorrect Wire Termination CouplingDual CoilFIG. 5 Incorrect Wire Termination SaddleSingle CoilF1055 163therefore, an optional alternative to crush tests for coupling-type joints 8 IPS
43、and larger is included as mandatory informa-tion in Annex A2. Tests performed in Annex A2 qualify thefitting design in lieu of the joint crush test portion of 9.4.1. Allother performance requirements in Section 5 and 9.4 shall besatisfied by testing to the requirements using the methodsdescribed in
44、9.6. Dimensions, Mass, and Permissible Variations6.1 Dimension and tolerances 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 inSpecifications F876
45、and F2788/F2788M, such that the jointswill satisfy the performance requirements in Section 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 andtolerances encompassing these d
46、ifferences 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 include at least the following dimen-sions and toler
47、ances: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 applicationof the fittings and is recommended as additional
48、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 making the joint.7. Workmanship, Finish, and Appeara
49、nce7.1 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 electrical 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
