The suction system of the horizontal centrifugal pump must meet two requirements:

1. Maintain sufficient NPSH value; stainless steel self priming pump

Net positive suction head (NetPositiveSuctionHead), namely NPSH, multi-stage centrifugal pump design, selection and operation and operation of the most important parameters, which is an important part of the multi-stage centrifugal pump system, and should be treated as a special piping design. NPSHa horizontal multistage centrifugal pump inlet pressure of the inlet pressure minus the pressure of steam pressure can be expressed at the height of the liquid column. This reflects the amount of pressure loss that the pump can withstand before the steam pressure is reached. Wenzhou zhongnai Valve Co. Ltd. in the multi-stage centrifugal pump product manuals are specified in the production of multistage centrifugal pump in the water as the medium required for the operation in the flow within the operating range of the NPSHr value, the data is usually applied to other physical properties similar to liquid.

Two, the pressure to maintain all points is higher than the vapor pressure.

A multistage centrifugal pump is a device used to deal with liquids rather than steam. If the internal pressure of the pump falls below the liquid vapor pressure, the steam is produced. The minimum pressure in the pump just appear in the impeller inlet, where the pressure drop, the impeller rapid uplift pressure, bubble rupture caused by cavitation damage, this is cavitation, cavitation will cause the multistage centrifugal pump impeller is corrosion damage, serious will affect the normal operation of multistage centrifugal pump. This situation must be avoided by maintaining enough net positive suction head or cavitation allowance (NPSH) specified in the manual of the multistage centrifugal pump. At the same time, we need to avoid the pressure of some point in the inlet pipe system of the multistage centrifugal pump, which may fall below the liquid vapor pressure.

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