🔍 Key Concepts

• Procedure for securing a centrifugal pump handling distillate or fuel • Purpose and normal operation of a three-way dump (recirculating) valve on a centrifugal pump • Why you must avoid deadheading (blocking discharge flow) a running centrifugal pump

💭 Think About

• Think about which action, if taken too early, could trap liquid and pressure in the pump and attached piping. • Which component in the system is specifically designed to give the pump a safe place to send flow when you are shutting it down? • In a safe shutdown, do you first isolate instruments and vents, or do you first make sure the pump has a low‑risk flow path or unloading path?

✅ Before You Answer

• Identify what happens to pump discharge pressure if you close vents/valves while the pump is still running against a closed line. • Verify the function of the three-way dump valve in your engineering reference: does it send flow back to suction or to a safe return line? • Confirm the standard sequence for avoiding overheating and overpressure when stopping a centrifugal fuel or distillate pump.