Heating And Cooling Of Tanks
Tank Coils Pipe tank coils are made in a wide variety of configurations, depending upon the application and shape of the vessel. Helical and spiral coils are most commonly shop-fabricated, while the hairpin pattern is generally field-fabricated. The helical coils are used principally in process tanks and pressure vessels when large areas for rapid heating or cooling are required. In general, heating coils are placed low in the tank, and cooling coils are placed high or distributed uniformly through the vertical height.
Stocks which tend to solidify on cooling require uniform coverage of the bottom or agitation. A maximum spacing of 0.6 m (2 ft) between turns of 50.8-mm (2-in) and larger pipe and a close approach to the tank wall are recommended. For smaller pipe or for low-temperature heating media, closer spacing should be used. In the case of the com h
TABLE 11-2 Overall Heat-Transfer Coefficients for Coils Immersed in Liquids
TABLE 11-2 Overall Heat-Transfer Coefficients for Coils Immersed in Liquids
|
Substance inside coil |
Substance outside coil |
Coil material |
Agitation |
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