Electric Driven Split Case Pump

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Electric Driven Split Case Pump construction
The main components of s, sh split casing pump are listed as follows: Lower half casing, upper half casing, impeller, shaft, double suction sealing, shaft sleeves, bearing housings and couplings.
The volute casing is split on the horizontal centerline with the suction and discharge nozzle cast integral with the pump casing. The upper casing is accurately located on the lower half by the use of dowel pins. The upper casing can be removed to inspect the interior of the pump without disturbing the pipe connections or pump alignment. The suction and discharge flanges contain tapped holes for vacuum and pressure gauge. At the bottom of the flanges, there are tapped plugs for water drainage.
The impeller has been balanced statically. It is securely keyed to the shaft and adjusted to proper axial position by the shaft sleeves and external shaft nuts. The impeller is a double-suction enclosed type. It is hydraulically balanced by its inherent design. In case there is some slight residual thrust, it can be carried up by the bearing on the shaft end.

Split casing pump shaft is provided with two roller bearing mounted in the bearing housings at both ends. They are single row, deep-groove type, being lubricated with grease.
The flexible couplings connect the pump with the motor directly. For pumps driven by belt, there must be an intermediate bracket fitted for supporting the belt pulley.
The close running fit between the wearing rings and the impeller minimizes the leakage of water back into the suction part. The rings protect the casing from wearing and can be promptly replaced with the spare parts when they have been worn out.

The shaft sleeves extend through the stuffing boxes. They protect the shaft from wearing. The sleeves can be renewable with the spare parts after worn out.
The shaft seal is soft packing. The stuffing ring is fit between the packing in order to prevent air from leaking into the pump and to cool and lubricate sealing case, and while the pump is working, a small amount of high-pressured water flows into the packing case through the concave notch on the pump cover to function as water seal.

The appropriate leakage from the packing case is at 10 to 20 drops per minute. When the diameter of the suction nozzle is not larger than 300mm, or, the motor power is lower than 90kw/h, the pump set will be completed with common bedplate, which should be specified when an order is made.

Split casing pump application:
S/sh series of horizontal double suction split case centrifugal pump is widely used for water plant, irrigation, drainage pumping station, power station, water circulation of air-conditioning, industrial water supply system, fire system and shipping industry as well as for the general purpose in the oil refining industry.