Oilers/Plant Tenders (HHC) Civil Service Practice Exam

What should the oil pressure for a steam turbine cooler be compared to the water pressure?

1. Less than the water pressure

2. Equal to the water pressure

3. Greater than the water pressure

4. Variable against the water pressure

The correct answer is: Greater than the water pressure

In the context of steam turbine coolers, the oil pressure being greater than the water pressure is crucial for several reasons, primarily related to the safety and efficiency of turbine operation. Having a higher oil pressure ensures that the oil is effectively circulated through the cooler to absorb heat from the turbine components. This helps maintain optimal operating temperatures and protects against overheating, which can lead to mechanical failure. Additionally, when oil pressure is greater than water pressure, it prevents the possibility of water from entering the oil system. This is important because water contamination can severely affect the lubrication properties of the oil, potentially leading to increased wear on turbine components. Therefore, maintaining higher oil pressure is a protective measure to safeguard the turbine’s performance and reliability. In contrast, if the oil pressure were less than or equal to the water pressure, there would be a risk of backflow or mixing, which could compromise the integrity of the lubrication system and adversely affect turbine functionality. Furthermore, varying the oil pressure against the water pressure would not establish a consistent operational standard, which is generally not advisable in turbine cooling systems.