1、Designation: F2788/F2788M 13F2788/F2788M 15Standard Specification forMetric and Inch-sized Crosslinked Polyethylene (PEX) Pipe1This standard is issued under the fixed designation F2788/F2788M; the number immediately following the designation indicates the yearof original adoption or, in the case of
2、revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers crosslinked polyethylene (PEX) pipe that is outside diameter controll
3、ed in metric pipe sizes 16 mmto 100 mm and inch pipe sizes 3 in. to 54 in., made in nominal pipe dimension ratios, and pressure rated for water at threetemperatures (see Appendix X1). Included are requirements and test methods for material, workmanship, dimensions, burstpressure, hydrostatic sustain
4、ed 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 pipemarkings are also given. The pipe covered by this specification is i
5、ntended for buried pressure piping applications (such as,industrial and general-purpose pipelines, potable water pipelines, fire extinguishing pipelines). This specification also includescarbon black requirements for PEX pipe used for aboveground pressure piping applications.1.2 The text of this spe
6、cification 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 The values stated in either SI units or inch-pound units are to be regarded se
7、parately as standard. The values stated in eachsystem may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from thetwo systems may result in non-conformance with the standard.NOTE 1Metric sized (SI units) pipe should only be joined with corr
8、esponding metric-sized fittings and inch-sized pipe should only be joined withcorresponding inch-sized fittings. Inch sized fittings should not be used for metric sized pipe, and metric sized fittings should not be used for inch-sizedpipe.1.4 This standard does not purport to address all of the safe
9、ty concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plas
10、tics for TestingD792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by DisplacementD1505 Test 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 Resi
11、stance to Short-Time Hydraulic Pressure of Plastic Pipe, Tubing, and FittingsD1600 Terminology for Abbreviated Terms Relating to PlasticsD1898 Practice for Sampling of Plastics (Withdrawn 1998)3D2122 Test Method for Determining Dimensions of Thermoplastic Pipe and FittingsD2765 Test Methods for Dete
12、rmination of Gel Content and Swell Ratio of Crosslinked Ethylene PlasticsD2837 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 Scan
13、ning CalorimetryF412 Terminology Relating to Plastic Piping Systems1 This specification is under the jurisdiction of ASTM Committee F17 on Plastic Piping Systems and is the direct responsibility of Subcommittee F17.26 on Olefin BasedPipe.Current edition approved Nov. 1, 2013Dec. 1, 2015. Published D
14、ecember 2013January 2016. Originally approved in 2009. Last previous edition approved in 20112013as F2788F2788/F2788M11.13. DOI: 10.1520/F2788_F2788M-13.10.1520/F2788_F2788M-15.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. Fo
15、r Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 The last approved version 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
16、 an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is
17、 to be considered the official document.*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 States1F2023 Test Method for Evaluating the Oxidative Resistance of Crosslinked Polyethy
18、lene (PEX) Pipe, Tubing and Systems toHot Chlorinated WaterF2788/F2788M 1522.2 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:6NSF
19、/ANSI 14 for Plastic Piping Components and Related Materials2.6 ISO Standards:7ISO 1167 Thermoplastics pipes, fittings and assemblies for the conveyance of fluids Determination of the resistance tointernal pressure Part 1: General methodISO 4427 Plastic piping systems - Polyethylene (PE) pipes and f
20、ittings for water supplyISO 13760 Plastics pipes for the conveyance of fluids under pressure Miners rule Calculation method for cumulativedamageISO R 161-1690 Pipes of Plastic Materials for theTransport of Fluids (Outside Diameters and Nominal Pressures) Part 1, MetricSeries2.7 PPI Standards:8PPI TR
21、-3 Policies and Procedures for Developing Hydrostatic Design Basis (HDB), Pressure Design Basis (PDB), StrengthDesign Basis (SDB), and Minimum Required Strength (MRS) Ratings for Thermoplastic Piping Materials or PipePPI TR-4 PPI Listing of Hydrostatic Design Basis (HDB), Strength Design Basis (SDB)
22、, Pressure Design Basis (PDB) andMinimum Required Strength (MRS) Ratings for Thermoplastic Piping Materials or Pipe3. Terminology3.1 DefinitionsDefinitions are in accordance with Terminology F412, and abbreviations are in accordance with TerminologyD1600, unless otherwise specified.The abbreviation
23、for crosslinked polyethylene is PEX. Plastic pipe denotes a particular diameterschedule of plastic pipe in which outside diameter of the pipe conforms with ISO 4427.3.2 Definitions of Terms Specific to This Standard:3.2.1 crosslinked polyethylene plasticsplastics prepared by crosslinking (curing) po
24、lyethylene compounds.3.2.2 hydrostatic design stress (HDS)the estimated maximum tensile stress the material is capable of withstandingcontinuously with a high degree of certainty that failure of the pipe will not occur. This stress is circumferential when internalhydrostatic water pressure is applie
25、d. 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.HDS5HDB3DF (1)5HDB30.50 for this standard!3.2.3 hydrostatic design basis (HDB)one of a series of established stress values (specified inTest Method D
26、2837) for a plasticcompound obtained by categorizing the long-term hydrostatic strength determined in accordance with Test Method D2837.3.2.3.1 DiscussionA 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 i
27、s capable of withstanding continuously with a highdegree of certainty that failure of the pipe will not occur.3.2.5 relation between dimensions, hydrostatic design stress, and pressure ratingthe following expression, commonly knownas the ISO equation9 is used in this specification to relate dimensio
28、ns, hydrostatic design stress, and pressure rating:2S/P 5Do/t!21or (2)2S/P 5R 2I4 Available from American National 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 Robb
29、insAve., Philadelphia, PA19111-5098, http:/www.dodssp.daps.mil.DLADocument Services Building 4/D 700 Robbins Avenue Philadelphia, PA 19111-5094 http:/quicksearch.dla.mil/6 Available from NSF International, P.O. Box 130140, 789 N. Dixboro Rd., Ann Arbor, MI 48113-0140, http:/www.nsf.org.7 Available f
30、rom 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, Suite 825, Irving, TX 75062, http:/www.plasticpipe.org.9 ISO R1611690.F2788/F2788M
31、153S = 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)3.2.6 standard dimension ratio (SDR)/dimension ratio (DR)the ratio of outs
32、ide 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 called an SDR (standard dimension ratio); fo
33、r 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 accordance with applicableASTM standardsand as sho
34、wn 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 requirement for chlorine resistance.(2)
35、A digit “1” indicates the PEX pipe has been tested and meets the F XXXX FXXXX requirement for minimum chlorineresistance 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 “3” indicates that the PEX pipe has been tested a
36、nd meets the F XXXX FXXXX requirement for minimum chlorineresistance at 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 chlorine resistance at end usec
37、onditions 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 any decimal figures dropped.
38、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 covers one PEX pipe material
39、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 (12 in) and larger. The pres
40、sure 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 crosslinking, and (3) long-term
41、 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 73Fand 50 %at 140FRe-served100
42、 %at 140F. . . .Reserved . . . . . . . . . . .HDSfor water at73F. . . . . . . 630 . 800 .F2788/F2788M 154NOTE 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 local health authority. The evalu
43、ation 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 shall be made from polyethylene
44、 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 marked for, the materials, pro
45、cedure formixing, and the process for crosslinking shall result in a product with long term hydrostatic stress ratings equal better thanthosedesign stresses and pressure ratings as shown in Table 2, when determined in accordance with procedures no less restrictivethan those of PPI TR-39. See Appendi
46、x X1 for additional 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
47、polyethylene 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
48、 black PEX 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.TABLE 2 Material Designation Code CellsPEX Pipe Pressure Ratings Based on DR/SDR and TemperatureDR/SDR Rated Temperature
49、Hydrostatic Design Stress Pressure Rating for WaterF C psi MPa Psig MPaDR 6 73.4 23 630 4.34 210 1.45DR 6 73.4 (23) 630 (4.34) 250 (1.72)73.4 (23) 800 (5.51) 320 (2.21)180 82.2 400 2.76 160 1.10180 (82.2) 400 (2.76) 160 (1.10)200 93.3 315 2.17 125 0.86200 (93.3) 315 (2.17) 125 (0.86)DR 7.4 73.4 23 630 4.34 200 1.60DR 7.4 73.4 (23) 630 (4.34) 200 (1.38)73.4 (23) 800 (5.51) 250 (1.72)180 82.2 400 2.76 125 0.86180 (82.2) 400 (2.76) 125 (0.86)200 93.3 315 2.17 100 0.69200 (93.3) 315 (2.17) 100 (0.69)SDR 9 73.4 23 630 4.34
