The MSP-150 portable pump is based around a screw centrifugal impeller. This type of impeller combines the properties of a screw pump with those of a centrifugal pump. The low liquid velocities in the pump result in low shear forces. This makes the pump suitable for delicate liquids (which must be handled carefully and without too much motion and turbulence) and so problems such as coagulation of natural latex and emulsifi cation, such as in water-oil mixtures, are avoided. The last property makes the pump perfect for oil–recovery operations and it is for this reason that several coast guards have standardized on this type of pump. For very viscous products, like molasses and heavy fuel oil, the pump can be delivered with a different hydraulic motor.