Abstract: A screw pump for transporting a viscous product is described comprising a cylindrical housing connected to a removable bottom piece in one end and a removable cap in the opposite end, a rotor having one or more screw blades connected to a driving motor, an inlet and an outlet wherein the cylindrical housing is provided with a jacket for supply or removal of heat, and the rotor is provided with means for supply or removal of heat Such a screw pump is suitable for pumping emulsion susceptible to mechanical or temperature damage. Using such a pump e.g. food emulsions manufactured with reduced or without addition of emulsifiers may be transported without mechanical damaging the emulsion.