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A split casing pump is a type of pump whereby the casing is split either perpendicular or radially across the shaft to allow easy access to internal pump parts for maintenance.

The term is widely used to refer to a double suction pump / pipeline pump where an impeller which is designed for producing high volume flows. This is due to the impeller being of back to back design, where its design is like two impellers mounted together, mounted within a double volute.

Split casing pump designs have a single double impeller mounted on a shaft, with twin wear rings, twin mechanical seals or packing box, twin bearings and double volute. Such units are known to be highly efficient and consequently used in pipelines both for water and oil where pumps operate 24/7 transferring high amounts across large distances. These are known as axially split pumps.

1. The double-suction centrifugal pump is more suitable for conveying large flow and requires stable operation. When the flow rate of the pump is very high, if it is a single-suction pump, it must have a large pump inlet and outlet diameter. At the same time, the speed should not be too large, and it should be stabilized at about 1450rmp. If a double-suction pump is used, the size and weight of the pump can be relatively reduced, the speed can be increased, and the volumetric efficiency can be increased.

2. The anti-cavitation ability of the double-suction pump is stronger than that of the single-suction pump. Since the medium is sucked in at both ends of the impeller, hydraulic symmetry will be formed, so that the balanced axial thrust of the double-suction pump is better than that of the single-suction pump, and it runs more smoothly. Moreover, the flow rate of the medium is low, and the impeller is not prone to cavitation.

Double suction pump mainly sucks the medium at both ends of the impeller, and there is a sealed cavity on each side of the impeller. Instead of the pump has two suction ports. The anti-cavitation ability of double suction pump is stronger than single suction pump. Since the medium is sucked in at both ends of the impeller, hydraulic symmetry will be formed. In this way, the balanced axial thrust of the double-suction pump is better than that of the end-suction pump, and it runs more smoothly. Moreover, the flow rate of the medium is low, and the impeller is not prone to cavitation. However, the double-suction pump has one more sealed cavity than the single-suction pump, so its cost is relatively high.