Question 48Steam Plants - QMED

The correct answer is C) increase the opening of the lube oil cooler seawater discharge valve. To explain: If the main lube oil temperature is higher than normal, it indicates that the lube oil cooler is not effectively dissipating the heat from the oil. To remedy this, you should increase the opening of the lube oil cooler seawater discharge valve. This will allow more seawater to flow through the cooler, improving its heat transfer capacity and lowering the lube oil temperature. The other options are incorrect because: A) Opening the seawater inlet valve wider would not necessarily increase the flow through the cooler. B) Speeding up the lube oil pump would not affect the cooling capacity of the lube oil cooler. D) Throttling in on the seawater discharge valve would restrict flow, further reducing the cooling capacity.