Corrosion-Resistant Piping Systems by Philip A. Schweitzer P.E.

By Philip A. Schweitzer P.E.

This paintings provides a step by step approach for selecting the main compatible piping fabric for any given scenario. It describes all corrosion-resistant piping structures - together with thermoset and thermoplastic, covered and steel structures and miscellaneous structures reminiscent of glass, carbon and clay. A compatibility desk for every piping procedure, compiling the corrosion resistance of over a hundred seventy five universal corrodents, is supplied.

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The maximum allowable operating pressures at various operating temperatures are given in Table 2-7 Joining, Installing, Support Saran pipe is joined only by threading. No other method has proven successful. Installation should follow the details given on pages 24-32. Table 2-72 provides the recommended support spacingfor the piping. With a support spacing of 2 feet less it would be more economical to use a continuous support as shown in Figure 2-5. It has found wide applicationin the handling of plating chemicals and acid wastes.

Soils with GM,GC,SM,SC contains >12% fines Coarse-grained soils with little no fines. GW,SW,GP,SP contains <12% tines (or any borderline soil beginning with one thesesymbols GMGC,GC-SC) Slight <85%Proctor <40% rel. den. 200 Unified Soil Classification High Proctor >70% rel. den. use E, = 0 200 400 lo00 400 1000 2000 400 1000 2000 1000 2000 3000 Crushed See Table 2-7 Moderate 85-95% Proctor 40-70% rel. den. No data available-consult a soil engineer Fine-grained soils (LL < with medium to no plasticity.

The preferred method is thermal fusion. Threading is regtricted schedule 80 pipe. Hanged other connections are used primarily for connecting to pumps, instruments, valves, flanged accessories. See pages 21-23 for information on joining methods. Installation of PP pipe should follow the general rules established for thermoplastic piping as given on pages 24-32. Support spacingfor homopolymer PP pipe is given in Table 2-46, while Table 2-47 gives the recommended support spacing for copolymer PP pipe.

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