ASTM F2788/F2788M-21

Standard Specification for Metric and Inch-sized Crosslinked Polyethylene (PEX) Pipe

ABSTRACT
This specification details the physical and performance requirements, and the corresponding test methods, for the evaluation of crosslinked polyethylene (PEX) pipes that are outside diameter controlled, made in nominal pipe dimension ratios, and pressure rated for water at different temperatures. Crosslinked PEX pipes covered here shall be made from polyethylene compounds that have been crosslinked by peroxides, Azo compounds, or silane compounds in extrusion, or by electron beam after extrusion, and are primarily defined by means of three criteria, namely, nominal density, degree of crosslinking, and long-term strength tests. Sampled pipe specimens shall be tested for conformance with workmanship, dimension (out-of-roundness, outside diameter, and wall thickness), density, hydrostatic burst pressure, hydrostatic sustained pressure strength, excessive temperature-pressure capacity, environmental stress cracking, stabilizer functionality, bent-pipe hydrostatic sustained pressure strength, oxidative stability in potable chlorinated water, and degree of crosslinking requirements.
SCOPE
1.1 This specification covers crosslinked polyethylene (PEX) pipe that is outside diameter controlled in metric pipe sizes of DN 16 to DN 1000 (approximate outside diameters of 16 mm to 1005 mm) and inch pipe sizes NPS 3 to NPS 54 (approximate outside diameters of 3.5 in. to 54 in.), made in nominal pipe dimension ratios, and pressure rated for water at three temperatures (see Appendix X1). Included are requirements and test methods for material, 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, degree of crosslinking, and minimum operating temperature. Requirements for pipe markings are also specified. The pipe covered by this specification is intended for pressure applications, such as, industrial and general-purpose pipelines, potable water pipelines, and fire–extinguishing pipelines  
1.2 The text of this specification references notes, footnotes, and appendixes, which provide explanatory material. These notes and 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 separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 30-Apr-2021
• ICS: 23.040.20 - Plastics pipes
• Technical Committee: F17 - Plastic Piping Systems
• Drafting Committee: F17.26 - Olefin Based Pipe

Relations

• Refers: ASTM F412-20 - Standard Terminology Relating to Plastic Piping Systems
• Effective Date: 01-Apr-2020

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:F2788/F2788M −21 An American National Standard
Standard Specification for
1
Metric and Inch-sized Crosslinked Polyethylene (PEX) Pipe
ThisstandardisissuedunderthefixeddesignationF2788/F2788M;thenumberimmediatelyfollowingthedesignationindicatestheyear
of original adoption or, in the case of 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* Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
1.1 This specification covers crosslinked polyethylene
Barriers to Trade (TBT) Committee.
(PEX) pipe that is outside diameter controlled in metric pipe
sizes of DN 16 to DN 1000 (approximate outside diameters of
2. Referenced Documents
16 mm to 1005 mm) and inch pipe sizes NPS 3 to NPS 54
2
2.1 ASTM Standards:
(approximate outside diameters of 3.5 in. to 54 in.), made in
D618 Practice for Conditioning Plastics for Testing
nominal pipe dimension ratios, and pressure rated for water at
D792 Test Methods for Density and Specific Gravity (Rela-
three temperatures (see Appendix X1). Included are require-
tive Density) of Plastics by Displacement
ments and test methods for material, workmanship,
D1505 Test Method for Density of Plastics by the Density-
dimensions, burst pressure, hydrostatic sustained pressure,
Gradient Technique
excessive temperature-pressure, environmental stress cracking,
D1598 Test Method for Time-to-Failure of Plastic Pipe
stabilizer functionality, bent-pipe hydrostatic pressure, oxida-
Under Constant Internal Pressure
tive stability in potable chlorinated water, degree of
D1599 Test Method for Resistance to Short-Time Hydraulic
crosslinking, and minimum operating temperature. Require-
Pressure of Plastic Pipe, Tubing, and Fittings
ments for pipe markings are also specified. The pipe covered
D1600 TerminologyforAbbreviatedTermsRelatingtoPlas-
by this specification is intended for pressure applications, such
tics
as, industrial and general-purpose pipelines, potable water
D2122 Test Method for Determining Dimensions of Ther-
pipelines, and fire–extinguishing pipelines
moplastic Pipe and Fittings
1.2 Thetextofthisspecificationreferencesnotes,footnotes,
D2290 Test Method for Apparent Hoop Tensile Strength of
and appendixes, which provide explanatory material. These
Plastic or Reinforced Plastic Pipe
notesandfootnotes(excludingthoseintablesandfigures)shall
D2565 Practice for Xenon-Arc Exposure of Plastics In-
not be considered as requirements of the specification.
tended for Outdoor Applications
1.3 The values stated in either SI units or inch-pound units
D2765 Test Methods for Determination of Gel Content and
are to be regarded separately as standard. The values stated in
Swell Ratio of Crosslinked Ethylene Plastics
each system are not necessarily exact equivalents; therefore, to
D2837 Test Method for Obtaining Hydrostatic Design Basis
ensure conformance with the standard, each system shall be
forThermoplasticPipeMaterialsorPressureDesignBasis
used independently of the other, and values from the two
for Thermoplastic Pipe Products
systems shall not be combined.
D3895 Test Method for Oxidative-Induction Time of Poly-
olefins by Differential Scanning Calorimetry
1.4 This standard does not purport to address all of the
F412 Terminology Relating to Plastic Piping Systems
safety concerns, if any, associated with its use. It is the
F1055 Specification for Electrofusion Type Polyethylene
responsibility of the user of this standard to establish appro-
Fittings for Outside Diameter Controlled Polyethylene
priate safety, health, and environmental practices and deter-
and Crosslinked Polyethylene (PEX) Pipe and Tubing
mine the applicability of regulatory limitations prior to use.
F2023 Test Method for Evaluating the Oxidative Resistance
1.5 This international standard was developed in accor-
of Crosslinked Polyethylene (PEX) Pipe, Tubing and
dance with internationally recognized principles on standard-
Systems to Hot Chlorinated Water
ization established in the Decision on Principles for the
F2657 Test Method for Outdoor Weathering Exposure of
Crosslinked Polyethylene (PEX) Tubing
1
This specification is under the jurisdiction ofASTM Committee F17 on Plastic
Piping Systems and is the direct responsibility of Subcommittee F17.26 on Olefin
2
Based Pipe. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved May 1, 2021. Published May 2021. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 2009. Last previ
...

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. Because
it 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 version
of the standard as published by ASTM is to be considered the official document.
Designation: F2788/F2788M − 20 F2788/F2788M − 21 An American National Standard
Standard Specification for
1
Metric and Inch-sized Crosslinked Polyethylene (PEX) Pipe
This standard is issued under the fixed designation F2788/F2788M; the number immediately following the designation indicates the year
of original adoption or, in the case of 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 controlled in metric pipe sizes of DN
16 to DN 1000 (approximate outside diameters of 16 mm to 1005 mm) and inch pipe sizes NPS 3 to NPS 54 (approximate outside
diameters of 3.5 in. to 54 in.), made in nominal pipe dimension ratios, and pressure rated for water at three temperatures (see
Appendix X1). Included are requirements and test methods for material, 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, degree of crosslinking, and minimum operating temperature.
Requirements for pipe markings are also specified. The pipe covered by this specification is intended for pressure applications, such
as, industrial and general-purpose pipelines, potable water pipelines, and fire–extinguishing pipelines
1.2 The text of this specification references notes, footnotes, and appendixes, which provide explanatory material. These notes and
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 separately as standard. The values stated in each
system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used
independently of the other, and values from the two systems shall not be combined.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
D618 Practice for Conditioning Plastics for Testing
D792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement
D1505 Test Method for Density of Plastics by the Density-Gradient Technique
D1598 Test Method for Time-to-Failure of Plastic Pipe Under Constant Internal Pressure
D1599 Test Method for Resistance to Short-Time Hydraulic Pressure of Plastic Pipe, Tubing, and Fittings
D1600 Terminology for Abbreviated Terms Relating to Plastics
1
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 Based
Pipe.
Current edition approved Feb. 1, 2020May 1, 2021. Published March 2020May 2021. Originally approved in 2009. Last previous edition approved in 20192020 as
F2788/F2788M–19a.–20. DOI: 10.1520/F2788_F2788M-2010.1520/F2788_F2788M-21
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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F2788/F2788M − 21
D2122 Test Method for Determining Dimensions of Thermoplastic Pipe and Fittings
D2290 Test Method for Apparent Hoop Tensile Strength of Plastic or Reinforced Plastic Pipe
D2565 Practice for Xenon-Arc Exposure of Plastics Intended for Outdoor Applications
D2765 Test Methods for Determination of Gel Content and Swell Ratio of Crosslinked Ethylene Plastics
D2837 Test Method for Obtaining Hydrost
...