Pipe InsulationThe main purpose of insulating pipelines is toprevent heat passage from steam or hot-waterpipes to the surrounding air or from thesurrounding air to cold-water lines. In some coldregions, insulation also prevents water fromfreezing in a pipe, especially when the pipe runsoutside a building. Thus, hot-water lines areinsulated to prevent loss of heat from the hotwater, while potable waterlines are insulated toprevent absorption of heat in drinking water.Insulation also subdues noise made by the flowof water inside pipes, such as water closetdischarges. Common types of pipe insulatingmaterials are shown in figure 8-12.SANITARY DRAINAGE SYSTEMThe purpose of a drainage system is to carrysewage, rainwater, or other liquid wastes to apoint of disposal. Although there are three typesof drainage systems —storm, industrial, andsanitary—only the latter, which is the mostcommon drainage system installed by theSEABEEs, will be discussed.The SANITARY DRAINAGE SYSTEM car-ries sanitary and domestic wastes from a source(or collection system) to a sewage treatment plantor facility. Surface waters and groundwaters mustbe excluded from this system to prevent overloadof the sewage treatment facilities.Piping MaterialsThe types of materials actually used willdepend upon whether the installation isunderground, outside buildings, undergroundwithin buildings,or aboveground withinbuildings. The availability of certain types ofdesired piping materials and fittings may alsogovern the type of pipe actually used.Figure 8-12.-Types of pipe insulation.8-10
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