Comparison

The following overview gives you a overview of the advantages and disadvantages of common pump types.

Evaluation criterion Rotary Lobe P. Rotary Piston Pump Flap type pump Gear pump Progressive Cavity Pump Hose Pump Centrifugal Pump
Suitable for low viscosity media Advantage Advantage Disadvantage Advantage Advantage Advantage Advantage
Suitable for high viscosity media Advantage Advantage Advantage Advantage Advantage Advantage Disadvantage
Low pulsation and vibration Advantage Disadvantage Disadvantage Advantage Disadvantage Disadvantage Advantage
Wear/stock of spare parts Advantage Advantage Disadvantage Disadvantage Disadvantage Disadvantage Advantage
Dimensions Advantage Advantage Disadvantage Advantage Disadvantage Advantage Advantage
Self priming Advantage Advantage Disadvantage Advantage Advantage Advantage Advantage
Dry running Advantage Advantage Advantage Advantage Disadvantage Advantage Disadvantage
High pressures (over 16 bar) Disadvantage Advantage Disadvantage Advantage Advantage Disadvantage Disadvantage
Independent of the direction of rotation Advantage Advantage Disadvantage Advantage Disadvantage Advantage Disadvantage
Investment costs Disadvantage Disadvantage Disadvantage Advantage Advantage Advantage Advantage

Rotary Lobe Pump

Rotary lobe pumps are also ideal for handling media with particles. The particle size is limited by the design of the rotor and the dimension of the pump inlet and outlet. Operators benefit of a easy maintenance, because no pipeline system has to be dismounted. The rotors are synced by a separate gear in the back the pump. This design causes higher investment costs, but due to the fact that the rotors have a all round gap, the wear is reduced to a minimum. Due to that the pump can run dry.

Progressive Cavity Pump

Progressive cavity pumps (PCP) have a good suction performance, that's the reason why they are often used to empty barrels, tanks or mixers. They are also often used for exact dispense without a extra valve.

Especially at high pressures a PCP have a large dimension. (Due to pressure stages) Due to high friction resistance PCBs have a higher energy consumption in compairson to rotary lobe pumps. Furthermore a PCP forgives no dry run. And when replacing the rotor or stator, operators know how difficult it can be in comparison for example to a rotary lobe pump.

Flap Type Pump

Flap type pumps are a relict mainly used in the sugar industry for high viscous media. Due to their extrem energy inefficient pulsation, this type of pump is nowadays mostly replaced by rotary lobe pumps.

Centrifugal Pump

Centrifugal pumps are a sub-class of fluid kinetic machines. They are cheap, but can be used only for low viscous media, such as water, soft drinks, wine, yeast, brine, etc. In the food and beverage industry the centrifugal pumps often have a lower efficiency factor than displacement pumps.

Rotary Piston Pump

Rotary piston pumps are similar to a rotary lobe pump. Due to the rotor design, the shafts have a shorter design. This results in higher operating pressures. The rotor design causes higher pulsation as a general rotary lobe pump.

Hose Pump

The pump chamber of a hose pump is defined by a flexible hose. A rotor with rolls or sliding blocks squeezes this hose periodically. The amount of pulsation is defined by the ratio of the hose diameter in comparison to the immersion of the rotor. The frequency is defined by the rpm and the amount of rolls. Although the initial costs are quite cheap, the operators moan the frequent exchange of the hoses.

Gear Pump

The market offers internal and external gear pumps. The transport of the media is comes from charging and squeeze out of the space between the cogs. External gear pumps can handle high pressure—internal gear pumps only medium pressure.

Gear pumps are not an ideal solution for media with particles. An expensive external gear to sync both rotors is not necessary—and that causes high wear on the rotors.