Before a centrifugal pump can move liquid reliably, it needs to be properly primed. This simple preparation helps prevent startup problems and keeps your system working efficiently.
What is pump priming?
Priming means removing trapped air and filling the pump casing—and, where required, the suction line—with the liquid being pumped. Most standard centrifugal pumps cannot clear an air-filled suction line on their own.
Why does it matter?
Trapped air can prevent the pump from establishing flow. Correct priming helps protect the equipment and avoids unnecessary downtime.
How do you prime a centrifugal pump?
Always follow the manufacturer’s instructions for your pump and installation.
Supply above the pump: Slowly admit liquid through the suction valve and release trapped air through the designated vents.
Supply below the pump: Use the specified filling arrangement or priming system to fill the casing and suction line. A suitable foot valve may help retain the prime.
Once priming is complete, close the vents and follow the approved startup procedure.
What about self-priming pumps?
Self-priming does not necessarily mean starting dry. Many designs require an initial liquid fill.
Need help with pump selection, priming or maintenance? Contact All-Pumps for support suited to your application.