Operators with a flooded system should consider?

When dealing with a flooded system, operators must assess various factors to ensure safety and proper system operation. Considering hydrostatic expansion conditions when isolating the evaporator is important because when the evaporator is isolated, there may still be refrigerant present in the system. This refrigerant can expand due to changes in temperature, potentially leading to overpressure scenarios if not accounted for.

Furthermore, ensuring that the return pipe to the surge drum remains open is crucial. This allows for proper fluid circulation and pressure equalization, helping prevent potential blockages or pressure build-up in the system.

Lastly, awareness of hydrostatic reliefs around an isolation valve is essential. If the isolation valve is closed without proper relief measures in place, it can create conditions for hydrostatic pressures to increase, leading to possible equipment failure or safety hazards.

Considering all these points collectively illustrates why it is important for operators to address all aspects related to hydrostatic conditions in flooded systems, making the selection of all options the most comprehensive and appropriate choice.