Question 637Steam Plants - Assistant Engineer

The correct answer is D) lube oil coolers. In a pressure-type main propulsion turbine lubrication system, the lube oil service pumps normally take suction from the main sump and discharge directly to the lube oil coolers. This allows the lube oil to be filtered, cooled, and distributed to the various bearings and components that require lubrication in the turbine system. The other options are incorrect because: A) the main thrust bearing is just one of the components that receives lubrication, not the final destination of the lube oil; B) the gravity feed tank is not the typical discharge point for the lube oil service pumps; and C) the lube oil header is the distribution system that delivers the cooled and filtered lube oil to the various components, not the direct discharge point from the service pumps.