12. Nonmetallic Pressure Piping System Components1: Part A: Experience With Nonmetallic Materials in Structural/Pressure Boundary Applications
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This chapter discusses the current and future nonmetallic construction codes and standards using nonmetallic plastic polymers. It is divided into four parts. Part A provides an overview of the major nonmetallic materials used in structural applications, namely, thermoplastic materials, thermoset plastic materials, and graphite materials. It describes the importance of a design specification as well as its recommended contents and major aspects. Part A also provides information on two extensively utilized thermoplastic jointing techniques: butt fusion and electro-fusion. Part B and C cover NM-1 and NM-2 Standards, which prescribe requirements for the design, materials, fabrication, erection, inspections, examination, and testing of thermoplastic piping systems and glass-fiber-reinforced thermosetting-plastic piping systems, respectively. Included within the scope of the NM-1 Standard is thermoplastic piping which interconnects pieces or stages within a packaged equipment assembly. The contents and coverage of the NM-2 Standard address pipe and piping components that are produced as standard products, as well as custom products that are designed for a specific application. Fiberglass-reinforced plastic pipe and piping components manufactured by contact molding, centrifugal casting, filament winding, and other methods are covered. The organization of the NM-3 Standard, addressed in Part D, is modeled on the ASME Boiler and Pressure Vessel Code, Section II – Materials. ASME NM-3 addresses material specifications and material properties for both thermoplastic and thermoset plastic with glass reinforcing fibers. The NM-1 and NM-2 Standards reference NM-3 Standard for applicable material specifications and material physical and engineering property data.