SNH -E-Y type pump is derived based on SN series double heat pump body structure, the pump body is made of steel tube and steel plate welded together.At the levels of outer heating jacket symmetric position of a pair of in and out of the steam pipe, steam into the heating jacket as a transport liquid, heating on the transmission medium and preheating (purge steam temperature of 280 ℃ or less).This pump is mainly used in petroleum, chemical industry, refinery, oil depot, oil station, etc, high viscosity, illiquid liquid, such as heavy oil, residual oil, bitumen, crude oil, etc.