Download PDF by Philip A. Schweitzer P.E.: Corrosion-Resistant Piping Systems
By Philip A. Schweitzer P.E.
This paintings provides a step by step approach for opting for the main appropriate piping fabric for any given state of affairs. It describes all corrosion-resistant piping structures - together with thermoset and thermoplastic, coated and metal structures and miscellaneous structures reminiscent of glass, carbon and clay. A compatibility desk for every piping process, compiling the corrosion resistance of over one hundred seventy five universal corrodents, is equipped.
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Additional resources for Corrosion-Resistant Piping Systems
75 to give an allowable operating pressure of psi at 120°F (49°C). Table 2-43provides the maximum allowable operating pressureof flanged homopolymer PP systems based on operating temperature. When a piping system is used under negative pressure, such as a pump suction line, care should be taken not to exceed the collapse pressure rating of the pipe. These values are given in Table 2-44 for schedule 80 homopolymer PP pipe. Homopolymer polypropylene pipe is also available in standard pressure ratings of 45 psi, 90 psi, and 150 psi.
For nonpressure applications it may be used up to 180°F (82°C). with other thermoplastic piping systems, as the temperature increases above 73°F(23"C), the pressure rating must be reduced. Table2-5 1 provides the temperature correction factors to be used at elevated temperatures. These factors can be used in the following manner. 63. 63) = 126psi. A high-temperature pipe, Plexico HTPE, is also available. Its pressure/temperature ratings are given in Table 2-52. Pipe for burial underground is furnished color coded by means of four longitudinal stripes in blue, red, or yellow.
Under normal circumstances this does not impair the usefulness of the polymer. Upon removal of the solvent from contact and upon drying, its mechanical properties return to their original values, indicating that no chemical attack has taken place. ECTFE, like other fluoropolymers, will be attacked by metallic sodium and potassium. Table 2-59 provides the compatibility of ECTFE with selected corrodents. Although the table may indicate that ECTFE canbeusedwithaspecific corrodent, allowable operating pressures and temperatures of the piping system mustalso be checked,since the table only refers to the corrosion resistance of ECTFE.
Corrosion-Resistant Piping Systems by Philip A. Schweitzer P.E.