ASTM F2785-21
(Specification)Standard Specification for Polyamide 12 Gas Pressure Pipe, Tubing, and Fittings
Standard Specification for Polyamide 12 Gas Pressure Pipe, Tubing, and Fittings
ABSTRACT
This specification details the material and performance requirements, as well as the corresponding test methods, for the evaluation of polyamide 12 gas pressure pipes, tubing, and fittings that are intended for use in the distribution of natural gas in fuel gas mains and services for direct burial and reliner applications. It does not apply to threaded pipes. The pipes and fittings shall be made from virgin or reworked polyamide material that satisfies the short- and long-term hydrostatic design stress and hydrostatic design basis ratings, and rapid crack propagation (RCP) resistance properties. Properly sampled pipe and fitting specimens shall undergo test procedures and conform to the following requirements: workmanship; dimension (diameter, toe-in, wall thickness, wall thickness eccentricity range, ovality, and length); conditioning; slow crack growth resistance; resistance to RCP; minimum hydrostatic burst pressure/apparent tensile strength (quick burst); sustained pressure; outdoor storage stability; chemical resistance; elevated temperature service; butt fusion joints; butt heat fusion fittings; electrofusion fittings; mechanical fittings; transition fittings and anodeless risers; valves; and excess flow valves.
SCOPE
1.1 This specification covers requirements and test methods for the characterization of polyamide 12 pipe, tubing, and fittings for use in fuel gas mains and services for direct burial and reliner applications. The pipe and fittings covered by this specification are intended for use in the distribution of natural gas.
1.1.1 Pipe and fittings covered by this specification shall not be joined using taper pipe threads. Butt fusion joining shall be done in accordance with Practice F3372. Design considerations are discussed in Appendix X1. In-plant quality control programs are specified in Annex A1.
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 inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
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.
Note 1: Pipe and fittings utilizing heat fusion joining techniques produced from compounds meeting the requirements of Group 3, Class 2, and Grade 3 (PA323 or PA11) are intended for use with pipe manufactured from compounds meeting the requirements of Group 3, class 2 and Grade 3. Pipe and fittings utilizing heat fusion joining techniques produced from compounds meeting the requirements of Group 4, Class 2 and Grade 3 (PA 423 or PA12) are intended for use with pipe manufactured from compounds meeting the requirements of Group 4, Class 2 and Grade 3. As per the recommendations of the respective resin manufacturers, no cross fusion between PA 323 (PA11) and PA 423 (PA12) compounds is permitted.
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.
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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:F2785 −21 An American National Standard
Standard Specification for
1
Polyamide 12 Gas Pressure Pipe, Tubing, and Fittings
This standard is issued under the fixed designation F2785; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
1.1 This specification covers requirements and test methods
mendations issued by the World Trade Organization Technical
for the characterization of polyamide 12 pipe, tubing, and
Barriers to Trade (TBT) Committee.
fittings for use in fuel gas mains and services for direct burial
and reliner applications. The pipe and fittings covered by this
2. Referenced Documents
specification are intended for use in the distribution of natural
2
gas.
2.1 ASTM Standards:
1.1.1 Pipeandfittingscoveredbythisspecificationshallnot
D543Practices for Evaluating the Resistance of Plastics to
be joined using taper pipe threads. Butt fusion joining shall be
Chemical Reagents
doneinaccordancewithPracticeF3372.Designconsiderations
D618Practice for Conditioning Plastics for Testing
are discussed in Appendix X1. In-plant quality control pro-
D648Test Method for Deflection Temperature of Plastics
grams are specified in Annex A1.
Under Flexural Load in the Edgewise Position
1.2 Thetextofthisspecificationreferencesnotes,footnotes, D638Test Method for Tensile Properties of Plastics
and appendixes which provide explanatory material. These
D789Test Method for Determination of Relative Viscosity
notesandfootnotes(excludingthoseintablesandfigures)shall
of Concentrated Polyamide (PA) Solutions
not be considered as requirements of the specification.
D792Test Methods for Density and Specific Gravity (Rela-
tive Density) of Plastics by Displacement
1.3 Thevaluesstatedininch-poundunitsaretoberegarded
D1598Test Method for Time-to-Failure of Plastic Pipe
as standard. The values given in parentheses are mathematical
Under Constant Internal Pressure
conversions to SI units that are provided for information only
D1599Test Method for Resistance to Short-Time Hydraulic
and are not considered standard.
Pressure of Plastic Pipe, Tubing, and Fittings
1.4 This standard does not purport to address all of the
3
D1898Practice for Sampling of Plastics (Withdrawn 1998)
safety concerns, if any, associated with its use. It is the
D1600TerminologyforAbbreviatedTermsRelatingtoPlas-
responsibility of the user of this standard to establish appro-
tics
priate safety, health, and environmental practices and deter-
D2122Test Method for Determining Dimensions of Ther-
mine the applicability of regulatory limitations prior to use.
moplastic Pipe and Fittings
NOTE 1—Pipe and fittings utilizing heat fusion joining techniques
D2774PracticeforUndergroundInstallationofThermoplas-
produced from compounds meeting the requirements of Group 3, Class 2,
tic Pressure Piping
andGrade3(PA323orPA11)areintendedforusewithpipemanufactured
D2290Test Method for Apparent Hoop Tensile Strength of
from compounds meeting the requirements of Group 3, class 2 and Grade
3.Pipeandfittingsutilizing heat fusion joining techniques producedfrom Plastic or Reinforced Plastic Pipe
compoundsmeetingtherequirementsofGroup4,Class2andGrade3(PA
D2837Test Method for Obtaining Hydrostatic Design Basis
423 or PA12) are intended for use with pipe manufactured from com-
forThermoplasticPipeMaterialsorPressureDesignBasis
poundsmeetingtherequirementsofGroup4,Class2andGrade3.Asper
for Thermoplastic Pipe Products
the recommendations of the respective resin manufacturers, no cross
D6779Classification System for and Basis of Specification
fusion between PA 323 (PA11) and PA 423 (PA12) compounds is
permitted.
for Polyamide Molding and Extrusion Materials (PA)
F412Terminology Relating to Plastic Piping Systems
1.5 This international standard was developed in accor-
dance with internationally recognized principles on standard-
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1
This test method is under the jurisdiction ofASTM Committee F17 on Plastic contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Piping Systems and is the direct responsibility of Subcommittee F17.60 on Gas. Standards volume information, refer to the standard’s Document Summary page on
CurrenteditionapprovedJuly1,2021.PublishedJuly2021.Originallyapproved the ASTM website.
ɛ1 3
in 2009 as F2785–09. Last pre
...
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.
´1
Designation: F2785 − 20 F2785 − 21 An American National Standard
Standard Specification for
1
Polyamide 12 Gas Pressure Pipe, Tubing, and Fittings
This standard is issued under the fixed designation F2785; 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
ε NOTE—Table 4 was editorially corrected in April 2021.
1. Scope*
1.1 This specification covers requirements and test methods for the characterization of polyamide 12 pipe, tubing, and fittings for
use in fuel gas mains and services for direct burial and reliner applications. The pipe and fittings covered by this specification are
intended for use in the distribution of natural gas.
1.1.1 Pipe and fittings covered by this specification shall not be joined using taper pipe threads. Butt fusion joining shall be done
in accordance with Practice F3372. Design considerations are discussed in Appendix X1. In-plant quality control programs are
specified in Annex A1.
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 inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
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.
NOTE 1—Pipe and fittings utilizing heat fusion joining techniques produced from compounds meeting the requirements of Group 3, Class 2, and Grade
3 (PA323 or PA11) are intended for use with pipe manufactured from compounds meeting the requirements of Group 3, class 2 and Grade 3. Pipe and
fittings utilizing heat fusion joining techniques produced from compounds meeting the requirements of Group 4, Class 2 and Grade 3 (PA 423 or PA12)
are intended for use with pipe manufactured from compounds meeting the requirements of Group 4, Class 2 and Grade 3. As per the recommendations
of the respective resin manufacturers, no cross fusion between PA 323 (PA11) and PA 423 (PA12) compounds is permitted.
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:
D543 Practices for Evaluating the Resistance of Plastics to Chemical Reagents
1
This test method is under the jurisdiction of ASTM Committee F17 on Plastic Piping Systems and is the direct responsibility of Subcommittee F17.60 on Gas.
Current edition approved Dec. 1, 2020July 1, 2021. Published December 2020July 2021. Originally approved in 2009 as F2785–09. Last previous edition approved in
ɛ1
20182020 as F2785–18a.–20 . DOI: 10.1520/F2785-20.10.1520/F2785-21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. 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
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F2785 − 21
D618 Practice for Conditioning Plastics for Testing
D648 Test Method for Deflection Temperature of Plastics Under Flexural Load in the Edgewise Position
D638 Test Method for Tensile Properties of Plastics
D789 Test Method for Determination of Relative Viscosity of Concentrated Polyamide (PA) Solutions
D792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement
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
3
...
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