🔍 Key Concepts

• Low pressure refrigerant definition and typical operating pressure range • Purpose of a rupture disc as a safety device on storage containers • Relationship between design pressure, relief setting, and maximum allowable working pressure (MAWP)

💭 Think About

• Think about what pressure a low pressure refrigerant container might normally operate at and how much above that a safety device would be set. • Consider why the rupture disc must open before the container reaches a dangerous overpressure, but not so low that it opens during normal operation. • Compare the answer choices to typical low-pressure ranges: which value is high enough to avoid nuisance ruptures but low enough to protect the container?

✅ Before You Answer

• Verify typical normal operating pressure of low-pressure refrigerant storage containers in your reference materials. • Check what percentage above normal operating pressure a rupture disc or relief device is commonly set for on similar low-pressure vessels. • Confirm that the selected pressure is well below any likely container design or test pressure, yet above normal fluctuations in operating pressure.