Refrigeration Plant Operator B Practice Test

A pressure relief device on a refrigeration system is designed to prevent pressure from rising more than what percentage above its setting?

1. 5%

2. 10%

3. 15%

4. 20%

The correct answer is: 10%

The correct answer is based on industry standards related to pressure relief devices, which are designed to ensure safety and prevent equipment failure. A pressure relief device, such as a safety valve or rupture disc, typically has a set pressure at which it is designed to open and release excess pressure from the system. In refrigeration systems, regulations and safety protocols dictate that the relief device should be calibrated to open and vent pressure at a set point, but it is also designed to accommodate fluctuations. The common standard is that the relief device is allowed to relieve pressure if the system's pressure rises to 10% above its set point. This means that if the device is set to open at 100 psi, it will effectively begin to relieve pressure if the system pressure exceeds 110 psi. This threshold is established to ensure not only the safe operation of the refrigeration system but also to prevent potential damage to components that can occur if pressures exceed safe operating limits.