ASTM F2785 - 12 Standard Specification for Polyamide 12 Gas Pressure Pipe, Tubing, and Fittings

ASTM F2785 - 12

Standard Specification for Polyamide 12 Gas Pressure Pipe, Tubing, and Fittings

Active Standard ASTM F2785 | Developed by Subcommittee: F17.60

Book of Standards Volume: 08.04

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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.

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

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 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 (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D543 Practices for Evaluating the Resistance of Plastics to Chemical Reagents

D618 Practice for Conditioning Plastics for Testing

D638 Test Method for Tensile Properties of Plastics

D648 Test Method for Deflection Temperature of Plastics Under Flexural Load in the Edgewise Position

D789 Test Methods for Determination of Solution Viscosities of Polyamide (PA)

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

D1600 Terminology for Abbreviated Terms Relating to Plastics

D1898 Practice for Sampling of Plastics

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 by Split Disk Method

D2774 Practice for Underground Installation of Thermoplastic Pressure Piping

D2837 Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials or Pressure Design Basis for Thermoplastic Pipe Products

D6779 Classification System for and Basis of Specification for Polyamide Molding and Extrusion Materials (PA)

F412 Terminology Relating to Plastic Piping Systems

F1025 Guide for Selection and Use of Full-Encirclement-Type Band Clamps for Reinforcement or Repair of Punctures or Holes in Polyethylene Gas Pressure Pipe

F1473 Test Method for Notch Tensile Test to Measure the Resistance to Slow Crack Growth of Polyethylene Pipes and Resins

F1733 Specification for Butt Heat Fusion Polyamide(PA) Plastic Fitting for Polyamide(PA) Plastic Pipe and Tubing

F1973 Specification for Factory Assembled Anodeless Risers and Transition Fittings in Polyethylene (PE) and Polyamide 11 (PA11) and Polyamide 12 (PA12) Fuel Gas Distribution Systems

F2138 Specification for Excess Flow Valves for Natural Gas Service

F2145 Specification for Polyamide 11 (PA 11) and Polyamide 12 (PA12) Mechanical Fittings for Use on Outside Diameter Controlled Polyamide 11 and Polyamide 12 Pipe and Tubing

F2767 Specification for Electrofusion Type Polyamide-12 Fittings for Outside Diameter Controlled Polyamide-12 Pipe and Tubing for Gas Distribution

F2897 Specification for Tracking and Traceability Encoding System of Natural Gas Distribution Components (Pipe, Tubing, Fittings, Valves, and Appurtenances)

Federal Specifications

OPS Part 192 Title 49 ,Title 49 Code of Federal Regulations

ANSI Standards

B 31.8 Gas Transmission and Distribution Piping Systems

ICS Code

ICS Number Code 23.040.20 (Plastic pipes); 23.040.45 (Plastic fittings)

Referencing This Standard

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DOI: 10.1520/F2785-12

Citation Format

ASTM F2785-12, Standard Specification for Polyamide 12 Gas Pressure Pipe, Tubing, and Fittings, ASTM International, West Conshohocken, PA, 2012, www.astm.org