The rupture disc on a low-pressure centrifugal refrigeration unit is used as an overpressure 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?
• Function of a rupture disc as a non‑reclosing overpressure protection device • Where the highest pressure can occur when a centrifugal chiller compressor is idle and not circulating refrigerant • Relative pressures in evaporator, condenser, compressor discharge, and economizer areas of a low‑pressure refrigeration system
• When the compressor is idle and not pumping, which part of the system is most likely to experience the highest static pressure as the refrigerant warms up? • In a low‑pressure centrifugal chiller, which component normally contains low-pressure refrigerant and which contains higher-pressure refrigerant under normal operation? • Think about where a sudden rise in pressure (for example, due to air or noncondensables and temperature increase) would be most dangerous and therefore most likely to need a burst protection device.
• Identify which components are normally low side (evaporator, some economizer sections) versus high side (condenser, compressor discharge). • Consider which vessel is a large closed shell that could trap refrigerant and noncondensables when the unit is shut down and warming. • Match the answer choice to the component where a sudden overpressure during shutdown would most logically be relieved by a rupture disc.
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