Suction Lift Applications

Suction Lift using Gooseneck Flanges

For suction lift applications, the gooseneck flange configuration is required because it allows the pump to remain nearly filled with liquid. Two factors can then come into play to provide exceptional suction lift.

Good Prime

A fully primed Vogelsang HiFo rotary lobe pump floods the fluid chamber, fills all air gaps, and allows the closely fit lobes to actually pull air out of the suction pipe lifting the liquid below. Water columns over 20 feet can be lifted in this fashion. 

High speed

The second principle is high speed. Tests show that as pump speed increases, the ability of that pump to create exceptional suction lift also increases.

The Answer

We design the flanges on both sides of the pump in such a way that the pump remains primed even when the suction line may actually have drained back down into the supply vessel during a shut down, or on initial start-up. This superior ability to pull product up into the pump makes Vogelsang rotary lobe pumps fitted with goose neck style flanges, the clear suction lift leader.


Suction Lift using Straight Flanges

For suction lift applications, the straight flange configuration is not recommended because it doesn't allow the pump enough liquid to pull a vacuum.

The Vogelsang rotary lobe pump actually uses a flooded suction within the pump to create a vacuum. So long as the fluid level remains above the pump opening (as is the case with primed gooseneck or 90 degree style flanges) the pump is capable of pulling a 28 foot column of water with no trouble.

Since straight flanges do not provide for the priming effect which allow for the full vacuum pull the pump can be expected to provide, a much shorter column of water can be lifted.

We cannot overcome physics, and, at least in this universe, straight flanges will not provide conditions ideal for suction lift applications.