What needs to be corrected in a gravity flooded system to resolve changing conditions?

In a gravity flooded system, maintaining a consistent flow of liquid to the surge drum is crucial for stable operation. If conditions are changing—such as fluctuations in pressure or flow rates—it often indicates that the supply of liquid to the surge drum is being impacted. Investigating the liquid supply allows operators to identify blockages, fluctuations, or other issues that might be disrupting this flow.

The surge drum acts as a buffer that helps to manage the variability in the system, and any issues with liquid supply can lead to unstable operating conditions, potentially causing cavitation in pumps or variations in liquid levels. By ensuring that the supply to the surge drum is sufficient and consistent, operators can mitigate these changes and maintain proper system operation.

Looking at the other options, while increasing the suction header pressure, adjusting the compressor discharge pressure, or changing suction header temperature might address specific symptoms, they do not directly target the fundamental issue of liquid supply, which is central to the stability of a gravity flooded system. Thus, investigating the liquid supply to the surge drum is the key corrective action in this scenario.