Oilers/Plant Tenders (HHC) Civil Service Practice Exam

When should oil coolers be cut in during operation?

1. Before starting the oil pumps

2. After oil pumps have been started

3. Whenever the temperature exceeds a certain limit

4. Only during maintenance checks

The correct answer is: After oil pumps have been started

The practice of cutting in oil coolers after oil pumps have been started is essential for several reasons related to the safe and efficient operation of equipment. When oil pumps are started first, this ensures that the oil is flowing properly before introducing the cooling system into the circuit. Introducing coolers while the pumps are still off could lead to a momentary loss of lubrication in critical parts of the system, which might result in overheating or damage. When the oil pumps are already operating, the cooler can effectively reduce the temperature of the circulating oil, maintaining optimal operating conditions. This prevents thermal degradation and maintains the integrity of the oil and the machinery. Additionally, depending on the system design, running the oil pumps first ensures that there is adequate pressure to facilitate the circulation of oil through the cooler without air pockets, contributing to more reliable cooling and performance overall. In contrast, other choices may present risks or inefficiencies. For instance, starting the oil pumps after the coolers may disrupt the oil flow and lead to potential overheating of critical components, as there may be dry periods without adequate lubrication. Cutting in coolers based on temperature limits or during maintenance checks does not ensure consistent and optimal cooling during normal operations. Instead, the focus should be on maintaining the flow and temperature through