ASTM F2785-12
(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 This specification does not cover threaded pipe. Generic fusion guidelines are given in Appendix X1. Design considerations are discussed in Appendix X2. 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 and health 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.
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Designation:F2785 −12 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. Scope* 2. Referenced Documents
2
1.1 This specification covers requirements and test methods 2.1 ASTM Standards:
for the characterization of polyamide 12 pipe, tubing, and D543 Practices for Evaluating the Resistance of Plastics to
fittings for use in fuel gas mains and services for direct burial Chemical Reagents
and reliner applications. The pipe and fittings covered by this D618 Practice for Conditioning Plastics for Testing
specification are intended for use in the distribution of natural D648 Test Method for Deflection Temperature of Plastics
gas. Under Flexural Load in the Edgewise Position
1.1.1 This specification does not cover threaded pipe. Ge- D638 Test Method for Tensile Properties of Plastics
neric fusion guidelines are given in Appendix X1. Design D789 Test Methods for Determination of Solution Viscosi-
considerations are discussed in Appendix X2. In-plant quality ties of Polyamide (PA)
control programs are specified in Annex A1. D792 Test Methods for Density and Specific Gravity (Rela-
tive Density) of Plastics by Displacement
1.2 Thetextofthisspecificationreferencesnotes,footnotes,
D1598 Test Method for Time-to-Failure of Plastic Pipe
and appendixes which provide explanatory material. These
Under Constant Internal Pressure
notesandfootnotes(excludingthoseintablesandfigures)shall
D1599 Test Method for Resistance to Short-Time Hydraulic
not be considered as requirements of the specification.
Pressure of Plastic Pipe, Tubing, and Fittings
3
1.3 The values stated in inch-pound units are to be regarded
D1898 Practice for Sampling of Plastics (Withdrawn 1998)
as standard. The values given in parentheses are mathematical
D1600 TerminologyforAbbreviatedTermsRelatingtoPlas-
conversions to SI units that are provided for information only
tics
and are not considered standard.
D2122 Test Method for Determining Dimensions of Ther-
1.4 This standard does not purport to address all of the moplastic Pipe and Fittings
safety concerns, if any, associated with its use. It is the
D2774 PracticeforUndergroundInstallationofThermoplas-
responsibility of the user of this standard to establish appro- tic Pressure Piping
priate safety and health practices and determine the applica-
D2290 Test Method for Apparent Hoop Tensile Strength of
bility of regulatory limitations prior to use. Plastic or Reinforced Plastic Pipe
D2837 Test Method for Obtaining Hydrostatic Design Basis
NOTE 1—Pipe and fittings utilizing heat fusion joining techniques
forThermoplasticPipeMaterialsorPressureDesignBasis
produced from compounds meeting the requirements of Group 3, Class 2,
andGrade3(PA323orPA11)areintendedforusewithpipemanufactured for Thermoplastic Pipe Products
from compounds meeting the requirements of Group 3, class 2 and Grade
D6779 Classification System for and Basis of Specification
3. Pipe and fittings utilizing heat fusion joining techniques produced from
for Polyamide Molding and Extrusion Materials (PA)
compoundsmeetingtherequirementsofGroup4,Class2andGrade3(PA
F412 Terminology Relating to Plastic Piping Systems
423 or PA12) are intended for use with pipe manufactured from com-
F1025 Guide for Selection and Use of Full-Encirclement-
pounds meeting the requirements of Group 4, Class 2 and Grade 3.As per
the recommendations of the respective resin manufacturers, no cross Type Band Clamps for Reinforcement or Repair of Punc-
fusion between PA 323 (PA11) and PA 423 (PA12) compounds is
tures or Holes in Polyethylene Gas Pressure Pipe
permitted.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1
This test method is under the jurisdiction of ASTM 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
Current edition approved Aug. 1, 2012. Published September 2012. Originally the ASTM website.
3
approved in 2009 as F2785–09. Last previous edition approved in 2010 as The last approved version of this historical standard is referenced on
F2785–10a. DOI: 10.1520/F2785-12. www.astm.org.
*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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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: F2785 − 10a F2785 − 12 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. Scope 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 This specification does not cover threaded pipe. Generic fusion guidelines are given in Appendix X1. Design considerations
are discussed in Appendix X2. 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 and health 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D256 Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
D543 Practices for Evaluating the Resistance of Plastics to Chemical Reagents
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 Methods for Determination of Solution Viscosities of Polyamide (PA)
D790 Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials
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
D1898 Practice for Sampling of Plastics (Withdrawn 1998)
D1600 Terminology for Abbreviated Terms Relating to Plastics
D2122 Test Method for Determining Dimensions of Thermoplastic Pipe and Fittings
D2774 Practice for Underground Installation of Thermoplastic Pressure Piping
D2290 Test Method for Apparent Hoop Tensile Strength of Plastic or Reinforced Plastic Pipe by Split Disk Method
D2837 Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials or Pressure Design Basis for
Thermoplastic Pipe Products
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, 2010Aug. 1, 2012. Published January 2011September 2012. Originally approved in 2009 as F2785–09. Last previous edition approved
in 2010 as F2785–10.–10a. DOI: 10.1520/F2785-10A.10.1520/F2785-12.
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 websit
...
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