Abstract
Lubricating oil heaters and coolers are available in many different forms. The most common type uses steam or water for heating or cooling the oil and consists of a stack of tubes fitted inside a tubular shell. This chapter presents guidance on the selection of units of this type. The required size of the heater and the materials of construction are influenced by factors, such as circulation rate of the lubricating oil, pressure and grade or viscosity of the lubricating oil, and maximum allowable pressure drop across the heater. The required size of cooler and the materials of construction are influenced by factors, such as inlet lubricating oil temperature to cooler, outlet lubricating oil temperature from cooler, and cooling medium pressure. The chapter provides graphical representations of required cooling surface area for desired heat dissipation at various water temperatures for a typical lubricating oil system and variation of required heat transfer surface area with the heat-flow rate and the oil velocity for a typical industrial steam-heated lubricating oil heater.
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