By Philip A. Schweitzer P.E.
This paintings offers a step by step approach for picking the main compatible piping fabric for any given scenario. It describes all corrosion-resistant piping platforms - together with thermoset and thermoplastic, coated and metal platforms and miscellaneous structures comparable to glass, carbon and clay. A compatibility desk for every piping process, compiling the corrosion resistance of over one hundred seventy five universal corrodents, is supplied.
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Extra info for Corrosion-Resistant Piping Systems
2-4). When the recommended support spacing is relatively close (2-3 feet or less), it will be more economical to provide a continuous support. For this purpose channel iron or inverted angle iron can be used (see Fig. 2-5). This procedure should also be followed when the line is operating at elevated temperatures. Thesupport hangersshouldnotrigidlygripthe pipe, butshouldpermitaxial movement to allow for thermal expansion. All valves should be individually supported and braced against operating torques.
In general CPVC can notbe used to handle most polar organic materials including chlorinated or aromatic hydrocarbons, esters and ketones. Piping Thermoplastic 37 CPVC can be used to handle most acids, alkalis, salts, halogens, and many corrosive wastes. Table 2-37 lists thecompatibilityofCPVCwithselected corrodents. It is important to recognize that Table 2-37 only provides the compatibility of CPVC with selected corrodents. At elevated temperatures, although CPVC maybe resistant to a specific corrodent, the operating conditions may be such thata CPVC piping system may not be suitable.
Regardless of the type, the basic molecular unit of PE is: H I H 1 I H I H -c-cWhen PE is exposedto ultraviolet radiation, usually from the sun, photo light oxidation will occur. Therefore, it is necessary to incorporate carbon black into the resin to stabilize it. Other types of stabilizers will not provide complete protection. Table 2-49 lists the physicalandmechanicalproperties of extra highmolecular weight (EHMW) polyethylene. 1 Pipe Data Polyethylene pipe is available in several categories.