1、Designation: F2788 11F2788/F2788M 13 An American National StandardStandard Specification forMetric-sized Metric and Inch-sized Crosslinked Polyethylene(PEX) Pipe1This standard is issued under the fixed designation F2788;F2788/F2788M; the number immediately following the designation indicatesthe year
2、 of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers metric-sized crosslinked pol
3、yethylene (PEX) pipe that is outside diameter controlled, controlledin metric pipe sizes 16 mm to 100 mm and inch pipe sizes 3 in. to 54 in., made in nominal pipe dimension ratios, and pressurerated for water at three temperatures (see Appendix X1). Included are requirements and test methods for mat
4、erial, workmanship,dimensions, burst pressure, hydrostatic sustained pressure, excessive temperature-pressure, environmental stress cracking,stabilizer functionality, bent-pipe hydrostatic pressure, oxidative stability in potable chlorinated water, and degree of crosslinking.Requirements for pipe ma
5、rkings are also given. The pipe covered by this specification is intended for buried pressure pipingapplications (such as, industrial and general-purpose pipelines, potable water pipelines, fire extinguishing pipelines). Thisspecification also includes carbon black requirements for PEX pipe used for
6、 aboveground pressure piping applications.1.2 The text of this specification references notes, footnotes, and appendixes, which provide explanatory material. These notesand footnotes (excluding those in tables and figures) shall not be considered as requirements of the specification.1.3 Except for d
7、imensions, the The values stated in either SI units or inch-pound units are to be regarded separately as standard.The values given in parentheses are mathematical conversions to SI units that are provided for information only and are notconsidered standard. For dimensions, the values stated in SI un
8、its are to be regarded as standard. The values given in parenthesesfor nominal sizes are mathematical conversions to inch-pound units that are provided for information only and are not consideredstated in each system may not be exact equivalents; therefore, each system shall be used independently of
9、 the other. Combiningvalues from the two systems may result in non-conformance with the standard.NOTE 1Metric sized (SI units) pipe should only be joined with corresponding metric sized metric-sized fittings and inch-sized pipe should only bejoined with corresponding inch-sized fittings. Inch sized
10、fittings should not be used for metric sized pipe, and metric sized fittings should not be usedfor inch-sized pipe.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate
11、safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by DisplacementD1505 Test
12、Method for Density of Plastics by the Density-Gradient TechniqueD1598 Test Method for Time-to-Failure of Plastic Pipe Under Constant Internal PressureD1599 Test Method for Resistance to Short-Time Hydraulic Pressure of Plastic Pipe, Tubing, and FittingsD1600 Terminology for Abbreviated Terms Relatin
13、g to PlasticsD1898 Practice for Sampling of Plastics (Withdrawn 1998)3D2122 Test Method for Determining Dimensions of Thermoplastic Pipe and FittingsD2765 Test Methods for Determination of Gel Content and Swell Ratio of Crosslinked Ethylene Plastics1 This specification is under the jurisdiction of A
14、STM Committee F17 on Plastic Piping Systems and is the direct responsibility of Subcommittee F17.26 on Olefin BasedPipe.Current edition approved May 1, 2011Nov. 1, 2013. Published May 2011December 2013. Originally approved in 2009. Last previous edition approved in 20092011 asF278809.11. DOI: 10.152
15、0/F2788-11.10.1520/F2788_F2788M-13.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 The last approved versio
16、n of this historical standard is referenced on www.astm.org.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all chan
17、ges accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Bar
18、r Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1D2837 Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials or Pressure Design Basis forThermoplastic Pipe ProductsD3895 Test Method for Oxidative-Induction Time of Polyolefins by Differential
19、Scanning CalorimetryF412 Terminology Relating to Plastic Piping SystemsF2023 Test Method for Evaluating the Oxidative Resistance of Crosslinked Polyethylene (PEX) Tubing and Systems to HotChlorinated WaterF2788/F2788M 1322.2 ANSI Standard:4B36.10 Standards Dimensions of Steel Pipe (IPS)2.3 Federal S
20、tandard:5FED-STD-123 Marking for Shipment (Civil Agencies)2.4 Military Standard:5MIL-STD-129 Marking for Shipment and Storage2.5 NSF Standard:6NSF/ANSI 14 for Plastic Piping Components and Related Materials2.6 ISO Standards:7ISO 1167 Thermoplastics pipes, fittings and assemblies for the conveyance o
21、f fluids Determination of the resistance tointernal pressure Part 1: General methodISO 4427 Plastic piping systems - Polyethylene (PE) pipes and fittings for water supplyISO 13760 Plastics pipes for the conveyance of fluids under pressure Miners rule Calculation method for cumulativedamageISO R 161-
22、1690 Pipes of Plastic Materials for theTransport of Fluids (Outside Diameters and Nominal Pressures) Part 1, MetricSeries2.7 PPI Standards:8PPI TR-3 Policies and Procedures for Developing Hydrostatic Design Basis (HDB), Pressure Design Basis (PDB), StrengthDesign Basis (SDB), and Minimum Required St
23、rength (MRS) Ratings for Thermoplastic Piping Materials or PipePPI TR-4 PPI Listing of Hydrostatic Design Basis (HDB), Strength Design Basis (SDB), Pressure Design Basis (PDB) andMinimum Required Strength (MRS) Ratings for Thermoplastic Piping Materials or Pipe3. Terminology3.1 DefinitionsDefinition
24、s are in accordance with Terminology F412, and abbreviations are in accordance with TerminologyD1600, unless otherwise specified.The abbreviation for crosslinked polyethylene is PEX. Plastic pipe denotes a particular diameterschedule of plastic pipe in which outside diameter of the pipe conforms wit
25、h ISO 4427.3.2 Definitions of Terms Specific to This Standard:3.2.1 crosslinked polyethylene plasticsplastics prepared by crosslinking (curing) polyethylene compounds.3.2.2 hydrostatic design stress (HDS)the estimated maximum tensile stress the material is capable of withstandingcontinuously with a
26、high degree of certainty that failure of the pipe will not occur. This stress is circumferential when internalhydrostatic water pressure is applied. The HDS is equal to the hydrostatic design basis (HDB) times the design factor (DF) forwater. For this standard, the design factor is equal to 0.50.HDS
27、5HDB3DF (1)5HDB30.50 for this standard!3.2.3 hydrostatic design basis (HDB)one of a series of established stress values (specified inTest Method D2837) for a plasticcompound obtained by categorizing the long-term hydrostatic strength determined in accordance with Test Method D2837.3.2.3.1 Discussion
28、A listing of HDB and HDS values are contained in PPI publication PPI TR-43.2.4 pressure rating (PR)the estimated maximum water pressure the pipe is capable of withstanding continuously with a highdegree of certainty that failure of the pipe will not occur.3.2.5 relation between dimensions, hydrostat
29、ic design stress, and pressure ratingthe following expression, commonly knownas the ISO equation9 is used in this specification to relate dimensions, hydrostatic design stress, and pressure rating:2S/P 5Do/t!21or (2)2S/P 5R 2IS = hydrostatic design stress, psi (or MPa),4 Available from American Nati
30、onal Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http:/www.ansi.org.5 Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http:/www.dodssp.daps.mil.6 Available from NSF International, P.O. Box
31、130140, 789 N. Dixboro Rd., Ann Arbor, MI 48113-0140, http:/www.nsf.org.7 Available from International Organization for Standardization (ISO), 1, ch. de la Voie-Creuse, Case postale 56, CH-1211, Geneva 20, Switzerland, http:/www.iso.ch.8 Available from Plastics Pipe Institute (PPI), 105 Decker Court
32、, Suite 825, Irving, TX 75062, http:/www.plasticpipe.org.9 ISO R1611690.F2788/F2788M 133P = 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)3.2.6 standard dimension ratio (S
33、DR)/dimension ratio (DR)the ratio of outside diameter to wall thickness. For PEX-pipe, itis calculated by dividing the average outside diameter of the pipe by the minimum wall thickness. If the calculated dimension ratiois a Preferred Number Series R 10 modified by +1 (7, 9, 11 etc.), then it is cal
34、led an SDR (standard dimension ratio); for all othernumbers, it is called a DR.3.2.7 standard pipe material designation codeThe pipe material designation code shall consist of the abbreviation for the typeof plastic (PEX) followed by fourArabic digits that describe short-term properties in accordanc
35、e with applicableASTM standardsand as shown in Table 1.3.2.7.1 DiscussionThe first digit is for chlorine resistance tested in accordance with Test Method F2023.(1) A digit “0” indicates that the PEX pipe either has not been tested for chlorine resistance or that the PEX pipe does not meetthe minimum
36、 requirement for chlorine resistance.(2) A digit “1” indicates the PEX pipe has been tested and meets the F XXXX requirement for minimum chlorine resistance atthe 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 “3” indicates
37、that the PEX pipe has been tested and meets the F XXXX requirement for minimum chlorine resistanceat end use condition of 50% at 140F and 50% at 73F.(5) A digit “4” is reserved for future application.(6) A digit “5” indicates that the PEX pipe has been tested and meets the requirement for minimum ch
38、lorine resistance at end useconditions of 100% of the time at 140F.3.2.7.2 DiscussionThe second digit is a “0“. This digit is reserved for a currently unspecified PEX pipe property.3.2.7.3 DiscussionThe last two digits are the hydrostatic design stress for water at 73F (23C) in units of 100 psi with
39、 any decimal figures dropped.Where the hydrostatic design stress code contains less than two figures, a zero is used before the number. Thus, a complete materialdesignation code for PEX pipe shall consist of the three letters “PEX“ and four digits.4. Pipe Classification4.1 GeneralThis specification
40、covers one PEX pipe material having pressure ratings for water at three temperatures. Thepressure ratings decrease as the temperature is increased.4.2 Standard Dimension Ratio (SDR)This specification covers PEX pipe in various standard dimension ratios and dimensionratios for nominal diameters 16 mm
41、 (12 in) and larger. The pressure ratings are uniform for all nominal pipe sizes with the sameDR or SDR.5. Materials5.1 GeneralCrosslinked polyethylene pipe, meeting the requirements of this specification, are primarily defined by means ofthree criteria, namely, (1) nominal density, (2) degree of cr
42、osslinking, and (3) long-term strength tests. There is a strong correlationbetween nominal density and results of short-term strength tests.TABLE 1 Material Designation Code CellsProperty Standard 0 1 2 3 4 5 6 7 8 9ChlorineResistanceF2023 Not testedor rated75 %at 73Fand 25 %at 140FRe-served50 %at 7
43、3Fand 50 %at 140FRe-served100 %at 140F. . . .Reserved . . . . . . . . . . .HDSfor water at73F. . . . . . . 630 . 800 .F2788/F2788M 134NOTE 2PEX pipe intended for use in the transport of potable water should be evaluated and certified as safe for this purpose by a testing agencyacceptable to the loca
44、l health authority. The evaluation should be in accordance with requirements for chemical extraction, taste, and odor that are noless restrictive than those included in NSF/ANSI 14. The seal or mark of the laboratory making the evaluation should be included on the pipe.5.2 Basic MaterialsPEX pipe sh
45、all be made from polyethylene compounds which have been crosslinked by peroxides, Azocompounds, or silane compounds in extrusion, or by electron beam after extrusion, or by other means such that the pipe meets theperformance requirements of Section 6. For the use temperatures that the pipe will be m
46、arked for, the materials, procedure formixing, and the process for crosslinking shall result in a product with long term hydrostatic stress ratings equal better than thoseshown in Table 2, when determined in accordance with procedures no less restrictive than those of PPI TR-39. See Appendix X1for a
47、dditional information on PPI hydrostatic stress ratings.NOTE 3Pipe produced by crosslinking by peroxides, Azo compounds, or silane compounds in extrusion, or by electron beam after extrusion havemet the requirements of Section 6. There are several other processes for producing crosslinked polyethyle
48、ne pipe. However, each process must beestablished as meeting the requirements of this specification.5.3 Pipe Material DesignationThe pipe meeting the requirements of this specification shall be designated PEX.5.4 Carbon BlackWhen black PEX pipe is intended for aboveground applications, the black PEX
49、 compound shall contain 2%to 3% carbon black. When PEX pipe is intended for applications other than above ground (UV exposed), see Appendix X2 forUV labeling guidelines.NOTE 4Plastics Pipe Institute literature states, “It has been demonstrated that a minimum of 2% well-dispersed very fine particle carbon black issufficient protection for continuous outdoor service”.6. Requirements6.1 WorkmanshipThe pipe shall be homogeneous throughout and free of visible cracks, holes, foreign inclusions, or otherdefects. The pipe shall
