In a pumper drum system, how is the liquid refrigerant removed into the recirculation header?

In a pumper drum system, the liquid refrigerant is typically removed into the recirculation header using high-pressure gas. This process utilizes the pressure differential between the high-pressure gas in the system and the lower pressure in the pumper drum to facilitate the movement of the liquid refrigerant.

By using high-pressure gas, the liquid refrigerant is effectively pushed or forced from the drum into the recirculation header where it can then be routed for use in the cooling process. This method is efficient, as it takes advantage of already existing pressure conditions within the system to ensure that refrigerant is continuously flowing and maintaining the desired system operation.

Other options, such as evaporator pressure or suction pressure, relate to different functions within the refrigeration cycle. Evaporator pressure pertains to the low-pressure side of the system, while suction pressure is connected to the compressor's intake. Liquid pumps, while a viable option in many systems for moving refrigerants, do not represent the primary mechanism in a pumper drum system. This function is most effectively accomplished through the use of high-pressure gas.