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Dosing pump installation and pipe laying precautions ◆ prevent pipeline vibration discharge end of the fluid due to inertial resistance at the beginning of the pump operation, will have a pulsating impact on the pipeline. This is a peculiar phenomenon of reciprocating pumps, caused by the sudden acceleration of the liquid in the pipe. In order to prevent this phenomenon from occurring, we request that the discharge end has an inertial resistance (Pid) <1.0kgf / cm2. When the Pid reaches 1.0kgf / cm2, the piping will vibrate, adversely affecting the pump and its peripherals. The solution: 1. Install pulsation damper; 2. Increase the outlet pipe diameter and shorten the length of the outlet pipe. ◆ To prevent excessive supply of excess supply is due to the flow of liquid in the pipeline inertia, affecting the normal operation of the check valve, the check valve failure, resulting in excessive pump flow, instability. This phenomenon may occur whenever there is insufficient negative pressure at the suction end or the piping is too long. Therefore, we require: Pump differential pressure> Inertial resistance Pi (greater of inlet or outlet). The solution: 1. Install the pulsation damper; 2. Install the back pressure valve; 3. Try to shorten the length of the inlet and outlet pipelines; ◆ Prevent the cavitation from occurring. If the equipment cavitation margin (NPSHa) is not enough, Cavitation is damaged. Therefore, we require installation cavitation allowance, NPSHa> NPSHr, and NPSHa = Pa-Pv ± Phs-Pis * (* or the larger of Pfs). Pa: absolute pressure of the liquid surface kg / cm2Pv: vapor pressure of the liquid surface kg / cm2Phs: relative pressure (kg / cm2, height of the liquid inlet) Pis: inlet resistance inertia kg / cm2Pfs: inlet pipe resistance kg / cm2