Double-Bearing multi-Section single-casing pumps NDMO

The pump is a sectional design with one-sided arrangement of impellers. The sectional casing consists of a set of sections with a connector in planes perpendicular to the pump axis. The sections are centered between each other and the covers on cylindrical grooves, the joints can be sealed either by metallic contact of the sealing belts or by means of sealing rings. The guide vanes in the pump are pressed into the sections. The sections and covers are connected to each other by tie rods and form the pump casing. Bearing brackets are attached to the casing covers by rods. Branch pipes and support feet are cast together with the covers. The axial force is balanced by the unloading drum, water from it is diverted into the annular chamber to the first stage. The end seals are mechanical seals of the "tandem" type. The residual axial load is supported by thrust roller bearings. The bearings are lubricated by the crankcase lubrication. The advantage of single-casing pumps is lower metal consumption and labor intensity compared to double-casing pumps. The pump is designed in accordance with API610 and fully complies with safety and reliability requirements. They are used for pumping products with temperatures up to 150̊С. The pump design is determined by three main factors: temperature, pressure and the nature of the pumped liquid. The suction and discharge pipes are designed taking into account the permissible loads according to API610. Main advantages: Simple design with a minimum number of parts to minimize dimensions and maintenance costs; Increased suction capacity of the first stage; Unloading from axial force using an unloading drum; Disassembly of the bearing assembly without the need to disassemble the entire pump. The design of the NDMO series pumps fully complies with API 610 type BB4.