Equipment Name DG Sub-high-pressure Boiler Feed Pumps Specifications Range of head: (m). Range of head: 500 ~ 1050. m Range of quantity(m3/h). Range of quantity: 12â??280m3/h. Introduction A DG Sub-high-pressure boiler feed pump is a segmental mono-casing multi-stage pump, where its inlet and outlet flanges are vertically upward, centrally supported to effectively prevent central asymmetry and vibration due to thermal expansion, its cooling water runs in a piping-main scheme system, and it provides a mechanical seal self-flushing system for user-friendly connection. It is characterized by a compact structure, attractive appearance, and reliable operation. The pump rotates clockwise when looked in the coupling direction.