Refrigeration & Air Conditioning Mechanic Red Seal · Question
A refrigeration system with a 200 L receiver containing R-134a at 25°C has a rated pressure of 1800 kPa. If the system is to be protected by a pressure relief valve, what is the maximum permissible setting for this valve according to CSA B52?
CSA B52, Section 7.4.2.1, states that the 'set pressure' of a pressure relief device shall not exceed the lesser of the design pressure of the protected compone
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Question: A refrigeration system with a 200 L receiver containing R-134a at 25°C has a rated pressure of 1800 kPa. If the system is to be protected by a pressure relief valve, what is the maximum permissible setting for this valve according to CSA B52?
Answer options:
- 1800 kPa ✅ 1620 kPa
- 1980 kPa
- 2160 kPa
Correct answer: 1620 kPa
Explanation: CSA B52, Section 7.4.2.1, states that the 'set pressure' of a pressure relief device shall not exceed the lesser of the design pressure of the protected component or 90% of the maximum rated pressure of the protected component. Thus, 90% of 1800 kPa is 1620 kPa.
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