In order to maintain the required lube oil temperature leaving a lube oil cooler, where an automatic bypass valve is not provided, which of the following operations is correct?
• Heat exchanger operation between lube oil and cooling water • Difference between adjusting cooling medium flow versus oil flow • Effect of regulating inlet vs. outlet side of a fluid system
• Which fluid (lube oil or cooling water) is normally kept as steady and constant as possible for reliable lubrication? • If you throttle or restrict flow on the wrong side of the cooler, what risks do you create for the lube oil system (pressure, flow, bearing safety)? • Think about which side is safer to control: the side supplying lubrication to machinery, or the side removing heat?
• Identify which system must maintain adequate flow and pressure at all times for bearing protection. • Decide whether control should normally be applied on the cooling water side or the lube oil side. • Consider whether control is typically done on the inlet to the cooler or the outlet/discharge from the cooler, and why.
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