The rupture disc on a low pressure centrifugal refrigeration unit is used as an over pressure protection device and is set to relieve at 15 psig and is most likely to lift when the compressor is idle? Where is the rupture disc located?

Correct Answer: Option D — on top of chiller evaporator shell

Low-pressure centrifugal units employ a rupture disc set to 15 psig mounted directly on top of the chiller evaporator shell to safely relieve excessive over-pressurization and prevent structural damage to the vessel's low-side components.