TABLE OF CONTENTS This chapter covers the general design concepts that apply to various thermoplastic-piping systems. Regardless of the type of material being used, the effective use of thermoplastic piping systems depends on a thorough knowledge of pipe system design and the characteristics of the plastic material being used. When designing a thermoplastic piping system careful attention should be given to the unique properties of plastics and their effects on the piping system design, installation, and operation. In the majority of thermoplastic piping systems the main properties of concern are:
Pressure limitations
Temperature limitations
Piping expansion and contraction
Thermoplastic piping systems are composed of various additives to a base resin or composition. Thermoplastics are characterized by their ability to be softened and reshaped repeatedly by the application of heat. Because of the slightly different compositions, the properties of plastic piping materials may vary between different manufacturers. As a result, designs and specifications need to address specific material requirements on a type and grade basis, which may need to be confirmed with the manufacturer.
All piping system designs are based on designing a piping system that will effectively and efficiently transport the required product. The design criteria for all piping applications are based on experience and applicable codes, standards, environmental requirements, and other parameters that may effect or constrain the work. An effective piping system design must include a methodical, step-by-step approach that gives proper consideration to the purpose of the piping system, how...
