ASTM F2785-18a

ASTM F2785-18a - 1.9.2018

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. Joining methods qualified in accordance with the requirements of Title 49 CFR Part 192.283 are acceptable. 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, 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

OPS Part 192 Title 49	,Title 49 Code of Federal Regulations
D543-21	Standard Practices for Evaluating the Resistance of Plastics to Chemical Reagents
D618-21	Standard Practice for Conditioning Plastics for Testing
D648-18	Standard Test Method for Deflection Temperature of Plastics Under Flexural Load in the Edgewise Position
D638-22	Standard Test Method for Tensile Properties of Plastics
D789-19	Standard Test Method for Determination of Relative Viscosity of Concentrated Polyamide (PA) Solutions
D1598-23	Standard Test Method for Time-to-Failure of Plastic Pipe Under Constant Internal Pressure
D1599-18	Standard Test Method for Resistance to Short-Time Hydraulic Pressure of Plastic Pipe, Tubing, and Fittings
D1898-68(1989)	Standard Practice for Sampling of Plastics (Withdrawn 1998)
D1600-18	Standard Terminology for Abbreviated Terms Relating to Plastics (Withdrawn 2024)
D2122-22	Standard Test Method for Determining Dimensions of Thermoplastic Pipe and Fittings
F2145-23	Standard 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
B 31.8	Gas Transmission and Distribution Piping Systems
F2138-12(2017)	Standard Specification for Excess Flow Valves for Natural Gas Service
D792-20	Standard Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement
D2774-21a	Standard Practice for Underground Installation of Thermoplastic Pressure Piping (Includes all amendments and changes 10/6/2021).
D2290-19a	Standard Test Method for Apparent Hoop Tensile Strength of Plastic or Reinforced Plastic Pipe (Includes all amendments and changes 9/12/2019).
D2837-22	Standard Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials or Pressure Design Basis for Thermoplastic Pipe Products
D6779-23	Standard Classification System for and Basis of Specification for Polyamide Molding and Extrusion Materials (PA)
F412-23	Standard Terminology Relating to Plastic Piping Systems
F1025-19	Standard Guide for Selection and Use of Full-Encirclement-Type Band Clamps for Reinforcement or Repair of Punctures or Holes in Polyethylene Gas Pressure Pipe
F1473-23	Standard Test Method for Notch Tensile Test to Measure the Resistance to Slow Crack Growth of Polyethylene Pipes and Resins
F1733-24	Standard Specification for Butt Heat Fusion Polyamide(PA) Plastic Fitting for Polyamide(PA) Plastic Pipe and Tubing
F1973-21	Standard Specification for Factory Assembled Anodeless Risers and Transition Fittings in Polyethylene (PE) and Polyamide 11 (PA11) and Polyamide 12 (PA12) Fuel Gas Distribution Systems
F2767-18(2023)	Standard Specification for Electrofusion Type Polyamide-12 Fittings for Outside Diameter Controlled Polyamide-12 Pipe and Tubing for Gas Distribution
F2897-23a	Standard Specification for Tracking and Traceability Encoding System of Natural Gas Distribution Components (Pipe, Tubing, Fittings, Valves, and Appurtenances) (Includes all amendments and changes 11/3/2023).