E D U R - Multiphase Pumps Innovative Pump Techniques for Handling of Liquid-Gas Mixtures and for Generation of Dispersions

The typical purpose of centrifugal pumps is the transport of pure liquids. However, this ideal application is not often found under real working conditions. In many cases the pumps also have to transport undissolved gas or vapor. The reasons for this may be inadequate installation, like slight leakages in the suction pipe lines, or insufficient liquid levels above the inflow of the suction pipe line in open systems etc. On the other hand, process-bounded requirements must be considered when presence of gas is desired. In a great number of engineering applications, multiphase media may occur and must be moved. Generally liquids have to be charged with gases, liquid-gas mixtures have to be pumped and gasemitting liquids must be reliably delivered.

Under such conditions, ordinary non-selfpriming centrifugal pumps either break down or do not allow reliable operation. Such failures basically have their roots in the impeller design. With increasing gas content, more and more stationary gas is created at the center of the impeller. This finally blocks the impeller entry of liquid and interrupts the supply output. Even with slight gas content, the characteristic curve is no longer stable.
Therefore, standard pumps are not suitable for such difficult working conditions. Process automated applications especially require controlled and trouble-free pump operation.

Today difficult applications like these are solved by the use of EDUR multiphase pumps.