When recovering the remaining R-134a refrigerant from the centrifugal chiller shown in the illustration as a vapor using the recovery unit's compressor, in addition to opening valves "1a", "1b", and the compressor suction and discharge isolation valves, which of the following would be the correct valve lineup? Illustration GS-RA-28

Illustration GS-RA-28: the U.S. Coast Guard has not released this illustration.

Question

When recovering the remaining R-134a refrigerant from the centrifugal chiller shown in the illustration as a vapor using the recovery unit's compressor, in addition to opening valves "1a", "1b", and the compressor suction and discharge isolation valves, which of the following would be the correct valve lineup? Illustration GS-RA-28

Illustration GS-RA-28: the U.S. Coast Guard has not released this illustration.

Accepted Answer

Option B: valves "3", "4", and "6" open; valves "2", "5", "7", "8", and "10" closed. Centrifugal chiller vapor recovery lineups dictate opening valves 3, 4, and 6 to route refrigerant vapor from the vessel through the recovery compressor suction while isolating liquid lines, preventing hydraulic lock and ensuring safe, compliant evacuation per EPA and marine guidelines.