Talking about two requirements of the horizontal multistage centrifugal pump suction system
The horizontal multistage centrifugal pump suction system must meet two requirements: 1. Maintain sufficient NPSH value; 2. Maintain pressure above all vapor pressures at all points.
Net Positive Suction Head (NPSH), the design, selection and operation of multistage centrifugal pumps. This is an important part of the multistage centrifugal pump system and should be used as a special piping. Designed to treat. The pressure available at the inlet nozzle of the NPSHa horizontal multistage centrifugal pump minus the vapor pressure is expressed as the height of the liquid column. This reflects the amount of head loss that the pump can withstand before it reaches the vapor pressure. Wenzhou Zhongna Pump & Valve Co., Ltd. has specified the NPSHr value required for the multi-stage centrifugal pump produced by the multi-stage centrifugal pump with water as the medium in the operating range of its flow rate. It is also generally applicable to other liquids of similar physical properties.
A multistage centrifugal pump is a device for treating liquids rather than vapors. Vapor is generated if the pressure inside the pump drops below the vapor pressure of the liquid. The low pressure of the Zui in the pump appears at the inlet of the impeller, where the pressure drops suddenly, the impeller rapidly raises the pressure, the bubble bursts, causing cavitation and causing damage. This is cavitation, which causes multi-stage centrifugation. The pump body and impeller are corroded and damaged, which will seriously affect the normal operation of the multistage centrifugal pump. This situation must be avoided by maintaining sufficient net positive suction head or NPSH as indicated in the manual attached to the multistage centrifugal pump. At the same time, we need to avoid the pressure at a certain point in the inlet piping system of the multistage centrifugal pump falling below the liquid vapor pressure.
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