What is the function of a discharge pressure relief device in an NFPA 20 system?

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Multiple Choice

What is the function of a discharge pressure relief device in an NFPA 20 system?

The main idea is safety against overpressure on the fire pump discharge. A discharge pressure relief device opens when the discharge pressure would rise above a safe limit, venting excess pressure to prevent damage to the pump, piping, and components downstream. It’s set to a predetermined relief pressure and stays closed under normal operation, then vents to a safe location (often to the atmosphere or a designated safe path) until pressure drops back to normal. This is especially important if a downstream valve is closed or a discharge path is blocked, which could cause the pump to generate excessive pressure. It doesn’t regulate temperature, measure flow, or add capacity during peak demand; its purpose is to protect the system from overpressure by relieving the excess discharge pressure.

The main idea is safety against overpressure on the fire pump discharge. A discharge pressure relief device opens when the discharge pressure would rise above a safe limit, venting excess pressure to prevent damage to the pump, piping, and components downstream. It’s set to a predetermined relief pressure and stays closed under normal operation, then vents to a safe location (often to the atmosphere or a designated safe path) until pressure drops back to normal. This is especially important if a downstream valve is closed or a discharge path is blocked, which could cause the pump to generate excessive pressure. It doesn’t regulate temperature, measure flow, or add capacity during peak demand; its purpose is to protect the system from overpressure by relieving the excess discharge pressure.

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