What is the function of an overpressure relief device located downstream of the regulator?

What is the function of an overpressure relief device located downstream of the regulator?

• A. Relieve excess pressure in the line after the regulator
• B. Reduce gas temperature
• C. Filter gas
• D. Measure flow rate

Answer: (A)

Relieving excess pressure in the line after the regulator is the purpose of an overpressure relief device. The regulator sets a safe downstream pressure, but if the regulator fails, or if a downstream restriction causes pressure to rise, the device senses that high pressure and vents gas to prevent the downstream system from exceeding safe limits. This protects piping, meters, and appliances from damage and reduces the risk of hazardous overpressure. This device isn’t intended to cool gas, filter it, or measure flow, which is why those functions aren’t correct for this location.

Relieving excess pressure in the line after the regulator is the purpose of an overpressure relief device. The regulator sets a safe downstream pressure, but if the regulator fails, or if a downstream restriction causes pressure to rise, the device senses that high pressure and vents gas to prevent the downstream system from exceeding safe limits. This protects piping, meters, and appliances from damage and reduces the risk of hazardous overpressure.

This device isn’t intended to cool gas, filter it, or measure flow, which is why those functions aren’t correct for this location.