Abstract
Many rotary pumping applications require that the pump be provided with some preheating or cooling. Preheating may be needed to handle hot liquid products such as asphalt, vacuum tower bottoms, hot melt adhesives, molten sulfur, etc. Pump cooling is sometimes required to maintain bearings, timing gears or other lubricated mechanisms at reasonable temperatures for longer life. There are times when both heating and cooling are required on the same pump, Figure 1. Rotary pumps have been successfully applied to process fluids in the 475 to 575 °F (245 to 300 °C) range and on occasion up to 650 °F (345 °C).
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