G2 Gas Fitter Practice Exam

What is the discharge pressure of a relief valve on a cylinder?

1. 250 PSIG

2. 375 PSIG

3. 150 PSIG

4. 500 PSIG

The correct answer is: 375 PSIG

The discharge pressure of a relief valve on a cylinder is set to ensure safety by preventing overpressure conditions that could lead to catastrophic failures. In the context of gas cylinders, the replacement and adjustment of relief valves are critical for maintaining operational safety. A relief valve typically has a predefined set pressure that it will activate to release excess pressure from the cylinder. In many situations, the industry standard for the discharge pressure of a relief valve might often be around 375 PSIG, as this allows for a safe margin above the working pressure of various gases while still effectively protecting the cylinder from excessive pressure build-up. Recognizing that different gases and applications may have specific requirements for their relief valves, 375 PSIG is a common standard value for many industrial applications. This not only provides an adequate safety buffer but also aligns with regulatory measures that demand such configurations to safeguard against pressure excursions in gas systems. Therefore, understanding this compliance with industry standards reinforces why 375 PSIG is the correct discharge pressure for a relief valve on a cylinder.