Pumping liquids from a tank with underpressure or even with (high) vacuum is not that easy. The only driving force left to get the liquid into the pump is gravity. In such situations, the so-called NPSHa (“net positive suction head available”) is often very small. Then it is extremely important that the pump has an even lower NPSHr (net positive suction head required).
Gear pumps in particular are characterized by a very low NPSHr and are therefore extremely suitable for pumping liquids from a vacuum. While centrifugal pumps often have a NPSHr of several meters of water column (mwk), gear pumps have a NPSHr of several centimeters mwk. This is achieved by a low speed, a large inlet and the high suction power of this type of pump.
It is even possible to use a gear pump to pump a high viscosity polymer from a vacuum tank with a positive supply height of only a few decimeters!!
Our gear pumps are also used under thin-film evaporators (with vacuum conditions) to pump the so-called bottom product from a collector. For example, when processing oligomers.
Suurmond offers solutions for this application for production, R&D and laboratory environments.
MAAG industrial pumps (*) – flow rates 0.5 to 2'400 l./min.
With or without magnetic coupling and possibly equipped with
a double, heatable magnetic sleeve in case of solidifying liquids.
(*)1 both MAAG chemical pumps and polymer pumps (VACOREX®)
GATHER magnetically coupled gear pumps
– flow rates from 0.33 ml/min to 66.7 l/min
HNPM micro gear pumps – flow rates 1.5 µl/min to 1.1 l/min
For example, for under a distillation column in a laboratory.
Are you looking for a solution for your demanding process? We like to think along with you!
Let's talk!
Nederlands