Double Suction Volute Pump

Double Suction Volute Pump

How to prevent suction and cavitation in the operation of double suction volute pump?

Evacuation means that there is gas and liquid in the pump, the pump can not work, and the flow and pressure tend to zero. Cavitation refers to the change and decrease of the medium, flow and pressure in the pump when the pump is running, resulting in hydraulic impact.

In general, the pumping of double suction volute pump refers to a kind of cavitation phenomenon in the pump, which is caused by the leakage of the installed pipeline, the insufficient air in the pipeline, or the change of operation and process. Therefore, in the operation, we should start from the stable process operating conditions, the operating temperature is easy to take the lower limit, and the pressure is easy to take the upper limit. In order to avoid or control the change of cavitation phenomenon, the pump flow in operation shall be operated within the range required by the pump nameplate as far as possible, and the large change of pressure and temperature shall be minimized. In the suction pipeline of the pump, gas retention shall be prevented, and the inlet of the standby pump whose inlet pressure is negative pressure shall be closed.

What should be paid attention to when double suction centrifugal pump is running?

1. Before starting the double suction pump, the pump must be filled with liquid until the liquid emerges from the vent hole at the top of the pump housing.

2. Before starting the double suction centrifugal pump, the outlet valve shall be fully closed to make it start when the flow is zero.

3.房颤ter the double suction centrifugal pump is started, the outlet valve is gradually adjusted to regulate the flow.

4. During the operation of double suction pump, check whether the bearing is overheated, whether the lubricating oil is in good condition, and whether the packing or mechanical seal is normal and hot.

5. When the pump is stopped, the outlet valve should be closed first to prevent the liquid in the outlet pipeline from reversing the pump impeller due to the pressure difference, causing the nut to fall off and the impeller to wear and impact.

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