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Split Case Pump Inlet and Outlet Pipeline Design

Categories:Technology Service Author: Origin:Origin Time of issue:2023-04-25
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1. Piping Requirements for Pump Suction and Discharge Piping

1-1. All pipelines connected to the pump (pipe burst test) should have independent and firm supports to reduce pipeline vibration and prevent the weight of the pipeline from pressing on the pump.

1-2. Adjustable brackets should be installed at the inlet and outlet pipelines of the pump. For pipelines with vibration, damping brackets should be installed to properly adjust the pipeline position and reduce the additional force on the pump nozzle caused by installation errors.

1-3. When the pipeline connecting the pump and the equipment is short and the two are not on the same foundation, the connecting pipeline should be flexible, or a metal hose should be added to compensate for the uneven settlement of the foundation.

1-4. The diameter of the suction and discharge piping should not be smaller than the pump inlet and outlet diameters.

1-5. The suction pipe of the pump should meet the net positive suction head (NPSH) required by the pump, and the pipe should be as short as possible with few turns. When the pipeline length exceeds the distance between the equipment and the pump, please ask the process system for calculation.

1-6. In order to prevent cavitation of the double suction pump, the elevation of the inlet nozzle pipe from the equipment to the pump should be gradually lowered, and there should be no U-shaped and in the middle! If it is unavoidable, a bleed valve should be added at the high point, and a drain valve should be added at the low point.

1-7. The length of the straight pipe section before the pump inlet of the centrifugal pump should not be less than 3D of the inlet diameter.

1-8. For double-suction pumps, in order to avoid cavitation caused by uneven suction in both directions, the double-suction pipes should be arranged symmetrically to ensure even flow distribution on both sides.

1-9 The pipeline arrangement at the pump end and driving end of the reciprocating pump should not hinder the disassembly and maintenance of the piston and tie rod.

2. Auxiliary Pipeline Setting of theSplit Case Pump

2-1.  Warm pump pipeline: When the temperature of the material delivered by the centrifugal pump exceeds 200 °C, a warm pump pipeline needs to be installed so that a small amount of material is led from the discharge pipeline of the operating pump to the outlet of the standby pump, then flows through the standby pump, and returns to the pump inlet to make the standby pump The pump is in hot standby for easy starting.

2-2. Anti-condensation pipes: DN20 25 anti-freeze pipes should be installed for pumps with condensable medium at normal temperature, and the setting method is the same as that of warm pump pipes.

2-3.  Balance pipe: When the medium is prone to gasification at the pump inlet, a balance pipe that can return to the gas phase space of the upstream equipment on the suction side can be installed between the pump inlet nozzle and the pump inlet shut-off valve, so that the generated gas can flow back. To avoid pump cavitation, a cut-off valve should be installed on the balance pipe.

2-4.  Minimum return pipe: In order to prevent the centrifugal pump from operating below the minimum flow rate of the pump, the minimum return pipe of the pump should be set to return a part of the fluid from the pump discharge port to the container at the split case pump suction port to ensure the flow rate of the pump.

Due to the particularity of the pump, it is necessary to have a full understanding of the performance of the pump and the process materials running in the pump, and the reasonable configuration of its inlet and outlet pipelines is required to ensure its safe and stable operation.