What should an operating engineer do in the event of liquid slugging?

In the event of liquid slugging, shutting off the compressor is the most appropriate action. Liquid slugging occurs when liquid refrigerant enters the compressor, which is designed to compress gas only. This can lead to serious mechanical damage, including compressor failure due to hydraulic lock. By shutting off the compressor, the operating engineer can prevent further damage and allow the system to stabilize.

Liquid slugging can happen due to various factors, such as improper charge levels, malfunctioning valves, or issues with the system’s piping. By stopping the compressor, the engineer can assess and address the underlying cause of the liquid slugging before restarting the system safely.

The other options would not effectively address the immediate danger posed by liquid slugging. For example, increasing the compressor speed may exacerbate the problem by drawing in more liquid, while raising system pressure could lead to even more liquid being pushed into the compressor. Opening the suction line might relieve some pressure but doesn't resolve the core issue and could also introduce liquid into the compressor as well.