What safety devices protect a pump and its discharge lines from overpressure?

• A. A safety switch.
• B. A relief valve only.
• C. A relief/pressure relief valve and proper gauge monitoring, along with correct valve and check valve use.
• D. Fire extinguishers.

Answer: (C)

Protecting a pump and its discharge lines from overpressure relies on a combination of automatic relief, monitoring, and proper flow control. The relief valve is the automatic safeguard that opens when pressure exceeds a set limit, venting fluid to prevent the system from being pushed beyond its design. But a relief valve alone won’t tell you when trouble is brewing, nor does it manage how the system behaves during normal operation; that’s where gauges come in. A pressure gauge provides real-time readings so operators can see rising pressure early and take action before the relief valve is needed or before damage occurs. Along with this, correct valve and check valve use ensures the flow path is controlled and protected from conditions that could cause pressure spikes—such as backflow, water hammer, or sudden surge during startup or shutdown. The check valve prevents reverse flow that can raise pressure downstream, and properly placed isolation or control valves keep the system stable and prevent dead-ends that concentrate pressure. Fire extinguishers don’t address pressure protection, so they’re not suitable for this purpose.