Self-Priming Pumps: Above-Grade Pumps That Reprime on Their Own
Self-priming pumps mounted where you can reach them that clear their own suction line and reprime automatically, sized and serviced across the Upper Midwest.
What problem does a self-priming pump solve?
A self-priming pump solves the problem of a pump mounted above the liquid it needs to draw: it clears air out of the suction line on its own and reprimes automatically between runs, so no one has to refill the suction line each time. That lets you keep the pump above grade where it is easy to reach, service, and inspect while still pulling liquid up from a pit, tank, or sump below. It is a common choice for dewatering, sump, and transfer duty.
How self-priming happens
The pump keeps a reservoir of liquid trapped in its casing. On startup the impeller churns that retained liquid together with air from the suction line, forming a frothy slurry the pump can move, and it pushes that air out through the discharge. As the air clears, liquid rises to fill the line and the pump settles into normal centrifugal operation. Because it holds liquid between runs, it can repeat the process without an operator, which is the whole point of the design.
Suction lift is the first sizing check
The defining spec is how high the pump can lift liquid on the suction side. That lift is bounded by atmospheric pressure and the pump design, and real-world lift is always less than the theoretical figure because friction, fluid temperature, and altitude all subtract from it. Keep the suction line as short and straight as possible, keep it airtight, and confirm the pump rated lift covers your actual geometry with margin. A leaky or overly long suction line is the most common reason a self-priming pump will not prime.
Solids handling and duty cycle
Many self-priming pumps are built to pass solids, which is why they suit dewatering, sump, and trash service. The solid size the pump can pass depends on its impeller and casing, so match the rated solids handling to what the fluid actually carries, and confirm the pump can take stringy or heavy trash if that is the duty. Also match the pump to the duty cycle: continuous dewatering, intermittent sump pumping, and job-site transfer place different demands on the pump and motor.
Self-priming pump lines available through Brabazon
Brabazon supplies Curflo self-priming pumps and sizes them to your suction lift, flow, head, and solids. Tell us the fluid and the setup and we will match the pump to the job.
Where self-priming pumps earn their keep
When a self-priming pump is NOT the right fit: if there is no room above grade or the liquid sits far below in a deep pit, a submersible pump placed in the liquid is the better answer. Self-priming pumps trade a modest lift limit for above-grade access. When placement rules over access, start at the pump category overview.
Repair and rentals
For rebuilds, wear-part replacement, or a temporary unit while yours is down, see pump repair and rebuild and pump and blower rentals.
Self-priming pump questions, answered first
How does a self-priming pump work?
A self-priming pump works by keeping a reservoir of liquid in its casing that mixes with incoming air on startup, forming a slurry the impeller can move so the pump evacuates air from the suction line and draws liquid up. Once the air is cleared the pump runs as a normal centrifugal pump. Because it retains liquid between runs, it can reprime on its own without an operator refilling the suction line every time.
How high can a self-priming pump lift liquid?
Suction lift is limited by atmospheric pressure and the pump design, and practical lifts are well under the theoretical maximum because friction, temperature, and altitude all reduce it. A self-priming pump can pull liquid up from below its own level, which is its main advantage, but every foot of lift and every fitting on the suction side eats into performance. Keep the suction line short, straight, and airtight, and confirm the rated lift covers your setup with margin.
When is a self-priming pump better than a submersible pump?
A self-priming pump is better when you want the pump out of the liquid for easy access, service, and inspection rather than submerged. Mounting above grade keeps the motor and pump dry, simplifies maintenance, and avoids lowering equipment into a pit or tank. A submersible pump wins when there is no room above grade or when the liquid must be pumped from deep down, so the choice comes down to access versus placement.
Can a self-priming pump handle solids?
Yes, many self-priming pumps are built to pass solids, which is why they suit dewatering, sump, and trash duty. The size of solid the pump can pass depends on the impeller and casing design, so match the rated solids size to what your fluid actually carries. For heavy trash or stringy material, confirm the pump is rated for it rather than assuming any self-priming pump will cope.
Talk to a Pump Engineer
Send your suction lift, flow, head, and solids and an engineer will size a self-priming pump for the job, then quote sale, repair, or rental. We answer 24/7.
Request a quote or sizing review
Tell us the suction lift, flow, head, and solids and an engineer will size a Curflo self-priming pump. Urgent? Call 800.825.3222, answered 24/7.
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