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Comment PDF Heat Transfer

Insulating Heat-Transfer-Fluid Piping

By Chemical Engineering |

Heat-transfer-fluid (HTF) system piping is insulated to reduce heat loss and prevent worker contact with hot surfaces. Insulated piping minimizes the effects of changes in ambient temperature to help ensure precise control of process temperature. Proper design of the HTF system and its insulation is required to reduce the risk of fire as a result of fluid leakage into insulation. Types of insulation The main insulation materials used for HTF system piping are fiberglass, mineral wool, calcium silicate and cellular glass. Table 1 lists some important properties to consider when choosing insulation. Fiberglass and mineral wool are fibrous materials produced in similar processes. Thermal conductivity is similarly low for both materials. Calcium silicate insulation is formed by drying a calcium silicate slurry in a mold, yielding a material with a slightly higher thermal conductivity than fiberglass or mineral wool. These three materials have open, air-filled channels, which can wick leaking fluid into the insulation. Cellular glass insulation is formed by heating a glass powder mixture, which melts and expands, leaving tiny, sealed glass cells throughout the material. It is impermeable to leaking fluid and has a thermal conductivity…
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