When measuring pump installation and pipeline laying, we should prevent pipeline vibration and discharge fluid. Because of inertia resistance, it will produce pulse impact force on pipeline at the beginning of pump operation. This is a special phenomenon of the reciprocating pump, which is caused by the sudden acceleration of the liquid in the pipe.

In order to prevent this phenomenon, we require the outlet inertia resistance (Pid) <1.0kgf/cm2. When Pid reaches 1.0kgf/cm2, the pipeline will vibrate, which will cause adverse effects on the pump and its peripherals. The following problems are summed up by the following problems: the following problems are summed up in Huaian.

1. Prevent pipeline vibration

The discharge end fluid, due to the inertia resistance, will produce pulsating impact force on the pipeline when the pump starts to run. This is a special phenomenon of the reciprocating pump, which is caused by the sudden acceleration of the liquid in the pipe. In order to prevent this phenomenon, we require the discharge inertia resistance (Pid) to be less than 1.0kgf/cm2. When Pid reaches 1.0kgf/cm2, the pipeline will vibrate, which will cause adverse effects on the pump and its peripherals.

Terms of settlement：

1. installation of pulse dampers;

2. increase the diameter of the outlet pipe and shorten the length of the outlet pipeline.

Two, prevent excessive supply

Excessive supply is due to the flow inertia of the liquid in the pipeline, which affects the normal work of the check valve and makes the check valve invalid, which leads to the excessive and unstable flow of the pump. It is possible to produce this phenomenon when the negative pressure of the suction end is insufficient or the pipeline is too long. Therefore, we require the pressure difference of the pump > inertia resistance Pi (the larger in the inlet or outlet).

Terms of settlement：

1. installation of pulse dampers;

2. install the back pressure valve;

3. as far as possible to shorten the length of the import and export pipeline.

Three, prevent the occurrence of cavitation

If the gas cavitation allowance (NPSHa) is insufficient, the pump may be damaged by disconnection or cavitation erosion. Therefore, we require the cavitation allowance of the device, NPSHa > essential cavitation allowance (NPSHr), NPSHa=Pa-Pv + Phs-Pis* (* or Pfs).

Pa kg/cm2Pv: absolute pressure level: kg/cm2Phs vapor pressure level: water inlet end height (and height) of the relative pressure (kg/cm2, into the absorption "+", "-" take on suction absorption Pis: water inlet end inertia kg/cm2Pfs: water inlet end pipe resistance kg/ cm2