1、Designation: F2788 11An American National StandardStandard Specification forMetric-sized Crosslinked Polyethylene (PEX) Pipe1This standard is issued under the fixed designation F2788; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision,
2、 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 metric-sized crosslinked poly-ethylene (PEX) pipe that is outside diameter con
3、trolled, madein nominal pipe dimension ratios, and pressure rated for waterat three temperatures (see Appendix X1). Included are require-ments and test methods for material, workmanship, dimen-sions, burst pressure, hydrostatic sustained pressure, excessivetemperature-pressure, environmental stress
4、cracking, stabilizerfunctionality, bent-pipe hydrostatic pressure, oxidative stabilityin potable chlorinated water, and degree of crosslinking.Requirements for pipe markings are also given. The pipecovered by this specification is intended for buried pressurepiping applications (such as, industrial
5、and general-purposepipelines, potable water pipelines, fire extinguishing pipe-lines). This specification also includes carbon black require-ments for PEX pipe used for aboveground pressure pipingapplications.1.2 The text of this specification references notes, footnotes,and appendixes, which provid
6、e explanatory material. Thesenotes and footnotes (excluding those in tables and figures) shallnot be considered as requirements of the specification.1.3 Except for dimensions, the values stated in inch-poundunits are to be regarded as standard. The values given inparentheses are mathematical convers
7、ions to SI units that areprovided for information only and are not considered standard.For dimensions, the values stated in SI units are to be regardedas standard. The values given in parentheses for nominal sizesare mathematical conversions to inch-pound units that areprovided for information only
8、and are not considered standard.NOTE 1Metric sized (SI units) pipe should only be joined withcorresponding metric sized fittings. Inch sized fittings should not be usedfor metric sized pipe.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It i
9、s theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD792 Test Methods for Density a
10、nd Specific Gravity (Rela-tive Density) of Plastics by DisplacementD1505 Test Method for Density of Plastics by the Density-Gradient TechniqueD1598 Test Method for Time-to-Failure of Plastic PipeUnder Constant Internal PressureD1599 Test Method for Resistance to Short-Time HydraulicPressure of Plast
11、ic Pipe, Tubing, and FittingsD1600 Terminology for Abbreviated Terms Relating toPlasticsD1898 Practice for Sampling of Plastics3D2122 Test Method for Determining Dimensions of Ther-moplastic Pipe and FittingsD2765 Test Methods for Determination of Gel Content andSwell Ratio of Crosslinked Ethylene P
12、lasticsD2837 Test Method for Obtaining Hydrostatic Design Basisfor Thermoplastic Pipe Materials or Pressure Design Basisfor Thermoplastic Pipe ProductsD3895 Test Method for Oxidative-Induction Time of Poly-olefins by Differential Scanning CalorimetryF412 Terminology Relating to Plastic Piping System
13、sF2023 Test Method for Evaluating the Oxidative Resistanceof Crosslinked Polyethylene (PEX) Tubing and Systems toHot Chlorinated Water1This specification is under the jurisdiction of ASTM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.26 on OlefinBased Pi
14、pe.Current edition approved May 1, 2011. Published May 2011. Originallyapproved in 2009. Last previous edition approved in 2009 as F278809. DOI:10.1520/F2788-11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book o
15、f ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Withdrawn. The last approved version of this historical standard is referencedon www.astm.org.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr
16、 Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.2.2 ANSI Standard:4B36.10 Standards Dimensions of Steel Pipe (IPS)2.3 Federal Standard:5FED-STD-123 Marking for Shipment (Civil Agencies)2.4 Military Standard:5MIL-STD-129 Marking for Shipment and Storage2.5 NSF Standard:6NS
17、F/ANSI 14 for Plastic Piping Components and RelatedMaterials2.6 ISO Standards:7ISO 1167 Thermoplastics pipes, fittings and assemblies forthe conveyance of fluids Determination of the resis-tance to internal pressure Part 1: General methodISO 4427 Plastic piping systems - Polyethylene (PE) pipesand f
18、ittings for water supplyISO 13760 Plastics pipes for the conveyance of fluids underpressure Miners rule Calculation method for cumu-lative damageISO R 161-1690 Pipes of Plastic Materials for the Transportof Fluids (Outside Diameters and Nominal Pressures) Part1, Metric Series2.7 PPI Standards:8PPI T
19、R-3 Policies and Procedures for Developing Hydro-static Design Basis (HDB), Pressure Design Basis (PDB),Strength Design Basis (SDB), and Minimum RequiredStrength (MRS) Ratings for Thermoplastic Piping Mate-rials or PipePPI TR-4 PPI Listing of Hydrostatic Design Basis (HDB),Strength Design Basis (SDB
20、), Pressure Design Basis(PDB) and Minimum Required Strength (MRS) Ratingsfor Thermoplastic Piping Materials or Pipe3. Terminology3.1 DefinitionsDefinitions are in accordance with Termi-nology F412, and abbreviations are in accordance with Termi-nology D1600, unless otherwise specified. The abbreviat
21、ion forcrosslinked polyethylene is PEX. Plastic pipe denotes a par-ticular diameter schedule of plastic pipe in which outsidediameter of the pipe conforms with ISO 4427.3.2 Definitions of Terms Specific to This Standard:3.3 crosslinked polyethylene plasticsplastics prepared bycrosslinking (curing) p
22、olyethylene compounds.3.4 hydrostatic design stress (HDS)the estimated maxi-mum tensile stress the material is capable of withstandingcontinuously with a high degree of certainty that failure of thepipe will not occur. This stress is circumferential when internalhydrostatic water pressure is applied
23、. The HDS is equal to thehydrostatic design basis (HDB) times the design factor (DF)for water. For this standard, the design factor is equal to 0.50.HDS 5 HDB 3 DF5 HDB 3 0.50 for this standard! (1)3.5 hydrostatic design basis (HDB)one of a series ofestablished stress values (specified in Test Metho
24、d D2837) fora plastic compound obtained by categorizing the long-termhydrostatic strength determined in accordance with TestMethod D2837.3.5.1 DiscussionA listing of HDB and HDS values arecontained in PPI publication PPI TR-43.6 pressure rating (PR)the estimated maximum waterpressure the pipe is cap
25、able of withstanding continuously witha high degree of certainty that failure of the pipe will not occur.3.7 relation between dimensions, hydrostatic design stress,and pressure ratingthe following expression, commonlyknown as the ISO equation9is used in this specification torelate dimensions, hydros
26、tatic design stress, and pressurerating:2S/P5 Do/t!2 1 or(2)2S/P 5 R2 IS = hydrostatic design stress, psi (or MPa),P = pressure rating, psi (or MPa),Do= average outside diameter, in. (or mm),t = minimum wall thickness, in. (or mm), andR = standard dimension ratio (SDR) or dimension ratio(DR)3.8 stan
27、dard dimension ratio (SDR)/dimension ratio(DR)the ratio of outside diameter to wall thickness. ForPEX-pipe, it is calculated by dividing the average outsidediameter of the pipe by the minimum wall thickness. If thecalculated dimension ratio is a Preferred Number Series R 10modified by +1 (7, 9, 11 e
28、tc.), then it is called an SDR(standard dimension ratio); for all other numbers, it is called aDR.3.9 standard pipe material designation codeThe pipematerial designation code shall consist of the abbreviation forthe type of plastic (PEX) followed by four Arabic digits thatdescribe short-term propert
29、ies in accordance with applicableASTM standards and as shown in Table 1.3.9.1 DiscussionThe first digit is for chlorine resistancetested in accordance with Test Method F2023.(1) A digit “0” indicates that the PEX pipe either has not beentested for chlorine resistance or that the PEX pipe does notmee
30、t the minimum requirement for chlorine resistance.(2) A digit “1” indicates the PEX pipe has been tested andmeets the F XXXX requirement for minimum chlorine resis-tance at the end use condition of 25% at 140F (60C) and 75%at 73F (23C).(3) A digit “2” is reserved for future application.(4) A digit “
31、3” indicates that the PEX pipe has been tested andmeets the F XXXX requirement for minimum chlorine resis-tance at end use condition of 50% at 140F and 50% at 73F.4Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.5Available
32、 from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http:/www.dodssp.daps.mil.6Available from NSF International, P.O. Box 130140, 789 N. Dixboro Rd., AnnArbor, MI 48113-0140, http:/www.nsf.org.7Available from International Organizatio
33、n for Standardization (ISO), 1, ch. dela Voie-Creuse, Case postale 56, CH-1211, Geneva 20, Switzerland, http:/www.iso.ch.8Available from Plastics Pipe Institute (PPI), 105 Decker Court, Suite 825,Irving, TX 75062, http:/www.plasticpipe.org.9ISO R1611690.F2788 112(5) A digit “4” is reserved for futur
34、e application.(6) A digit “5” indicates that the PEX pipe has been tested andmeets the requirement for minimum chlorine resistance at enduse conditions of 100% of the time at 140F3.9.2 DiscussionThe second digit is a 909. This digit isreserved for a currently unspecified PEX pipe property.3.9.3 Disc
35、ussionThe last two digits are the hydrostaticdesign stress for water at 73F (23C) in units of 100 psi withany decimal figures dropped. Where the hydrostatic designstress code contains less than two figures, a zero is used beforethe number. Thus, a complete material designation code forPEX pipe shall
36、 consist of the three letters 9PEX9 and fourdigits.4. Pipe Classification4.1 GeneralThis specification covers one PEX pipe ma-terial having pressure ratings for water at three temperatures.The pressure ratings decrease as the temperature is increased.4.2 Standard Dimension Ratio (SDR)This specificat
37、ioncovers PEX pipe in various standard dimension ratios anddimension ratios for nominal diameters 16 mm (12 in) andlarger. The pressure ratings are uniform for all nominal pipesizes with the same DR or SDR.5. Materials5.1 GeneralCrosslinked polyethylene pipe, meeting therequirements of this specific
38、ation, are primarily defined bymeans of three criteria, namely, (1) nominal density, (2) degreeof crosslinking, and (3) long-term strength tests. There is astrong correlation between nominal density and results ofshort-term strength tests.NOTE 2PEX pipe intended for use in the transport of potable w
39、atershould be evaluated and certified as safe for this purpose by a testingagency acceptable to the local health authority. The evaluation should bein accordance with requirements for chemical extraction, taste, and odorthat are no less restrictive than those included in NSF/ANSI 14. The sealor mark
40、 of the laboratory making the evaluation should be included on thepipe.5.2 Basic MaterialsPEX pipe shall be made from poly-ethylene compounds which have been crosslinked by perox-ides, Azo compounds, or silane compounds in extrusion, or byelectron beam after extrusion, or by other means such that th
41、epipe meets the performance requirements of Section 6. For theuse temperatures that the pipe will be marked for, the materials,procedure for mixing, and the process for crosslinking shallresult in a product with long term hydrostatic stress ratingsequal better than those shown in Table 2, when deter
42、mined inaccordance with procedures no less restrictive than those ofPPI TR-39. SeeAppendix X1 for additional information on PPIhydrostatic stress ratings.NOTE 3Pipe produced by crosslinking by peroxides,Azo compounds,or silane compounds in extrusion, or by electron beam after extrusion havemet the r
43、equirements of Section 6. There are several other processes forproducing crosslinked polyethylene pipe. However, each process must beestablished as meeting the requirements of this specification.TABLE 1 Material Designation Code CellsProperty Standard 0 1 2 3 4 5 6789ChlorineResistanceF2023 Not test
44、edor rated75 %at 73Fand 25 %at 140FReserved 50 %at 73Fand 50 %at 140FReserved 100 %at 140F. . . .Reserved . . . . . . . . . . .HDSfor water at73F. . . . . . . 630 . 800 .TABLE 2 Material Designation Code CellsDR/SDR Rated Temperature Hydrostatic Design Stress Pressure Rating for WaterF C psi MPa Psi
45、g MPaDR 6 73.4 23 630 4.34 210 1.45180 82.2 400 2.76 160 1.10200 93.3 315 2.17 125 0.86DR 7.4 73.4 23 630 4.34 200 1.60180 82.2 400 2.76 125 0.86200 93.3 315 2.17 100 0.69SDR 9 73.4 23 630 4.34 160 1.10180 82.2 400 2.76 100 0.69200 93.3 315 2.17 80 0.55SDR 11 73.4 23 630 4.34 125 0.86180 82.2 400 2.
46、76 80 0.55200 93.3 315 2.17 60 0.41DR 13.6 73.4 23 630 4.34 100 0.69180 82.2 400 2.76 60 0.41200 93.3 315 2.17 50 0.35DR 16.2 73.4 23 630 4.34 41 0.28180 82.2 400 2.76 26 0.18200 93.3 315 2.17 21 0.14SDR 17 73.4 23 630 4.34 80 0.55180 82.2 400 2.76 50 0.35200 93.3 315 2.17 40 0.28F2788 1135.3 Pipe M
47、aterial DesignationThe pipe meeting the re-quirements of this specification shall be designated PEX.5.4 Carbon BlackWhen black PEX pipe is intended foraboveground applications, the black PEX compound shallcontain 2% to 3% carbon black. When PEX pipe is intended forapplications other than above groun
48、d (UV exposed), seeAppendix X2 for UV labeling guidelines.NOTE 4Plastics Pipe Institute literature states, “It has been demon-strated that a minimum of 2% well-dispersed very fine particle carbonblack is sufficient protection for continuous outdoor service”.6. Requirements6.1 WorkmanshipThe pipe sha
49、ll be homogeneousthroughout and free of visible cracks, holes, foreign inclusions,or other defects. The pipe shall be as uniform as commerciallypracticable in color, opacity, density, and other physical prop-erties.6.2 Out-of RoundnessThe maximum out-of roundnessrequirements, shown in Table 3 for pipe, apply to the average,measured diameter after rounding with a rounding tool recom-mended by the manufacturer.6.3 Dimensions and Tolerances:6.3.1 Outside DiametersThe outside diameters and toler-ances shall be as shown in Ta
