You are installing a new refrigeration system aboard your vessel. The system comes with a 240 psi rupture disk, a safety valve set at 240 psi and a pressure gauge connection and gauge. According to the federal code of regulations, what is the preferred setup for installing the equipment on the condenser?

Correct Answer: Option D — Safety valve closest to the condenser, then pressure gage then rupture disk in series after the safety valve.

46 CFR 54.01-10 requires that safety valves be installed closest to the pressure vessel to ensure immediate relief. The rupture disk is placed in series after the safety valve to protect the valve from corrosive process fluids, while the gauge provides monitoring between the two safety devices.