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NM.1 : 2018
Thermoplastic Piping Systems

Thermoplastic Piping Systems

Document No. NM.1 Document Year 2018
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This document is published by American Society of Mechanical Engineers (ASME)

Standard Details

Piping Systems (NPPS) to develop standards for the construction of nonmetallic pressure piping systems. This Committee’s goal was to specify construction1 requirements for nonmetallic piping and piping products; such requirements were not adequately defined in existing standards.

Prior to the development of the ASME Standards for Nonmetallic Pressure Piping Systems, nonmetallic pressure piping requirements were contained within several existing standards. The nonmetallic piping requirements of the ASME B31 Code for Pressure Piping varied across Sections, with some Sections having no requirements for nonmetallic components at all. Other standards and codes, such as ASME RTP-1 and the ASME Boiler and Pressure Vessel Code (BPVC), Section X, included requirements for reinforced thermoset plastic (RTP) corrosion-resistant equipment but not for piping and piping components. ASME BPVC, Section III did have a few Code Cases that addressed requirements for some nonmetallic piping and piping components, including those made from glass-fiber-reinforced thermosetting resin (FRP) and a few thermoplastics, e.g., high density polyethylene (HDPE) and poly(vinyl chloride) (PVC). However, the scope of these Code Cases was very limited, and in some cases the methodology was nearly 30 years old. The ASME NPPS Standards now serve as a centralized location for NPPS requirements and are developed by committees whose members are experts in this field. The NPPS Committee’s functions are to establish requirements related to pressure integrity for the construction of nonmetallic pressure piping systems, and to interpret these requirements when questions arise regarding their intent.

This first edition of ASME NM.1 provides requirements for the construction of thermoplastic pressure piping systems. This Standard addresses both pipe and piping components that are produced as standard products, and custom products that are designed for a specific application.

ASME NM.1-2018 was approved by the American National Standards Institute (ANSI) on July 27, 2018.

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