Six technical protective lines for a stainless steel centrifugal pump

A stainless steel centrifugal pump usually has six protective lines. They are to protect the pump from damage and keep it running normally. We should set the protective lines according to the working conditions.

1.We should set DN20-25 warm-up lines if the pump delivers high temperature oil over 200 ℃, on condition that a standby pump is available.
2.Small flow quantity line
Sometimes the working flow quantity of the stainless steel centrifugal pump is lower than the rated value by 30%. In this case, we should set a small flow quantity line when it is running with minimum flow quantity.
3.Balance line
Sometimes, the saturated vapor pressure of the fluids the stainless steel centrifugal pump delivers is higher than the atmospheric pressure at room temperature. Sometimes, the fluids are at bubble point. In these cases, in order to prevent vapor or bubble from entering the pump and causing cavitation, we should add a balance line.
4.Bypass-line
If the stainless steel centrifugal pump is taking a test run or if it is not running normally, the main valve at its outlet will close. A bypass-line can make the pump continue running in that case. Generally, in conditions where the pressure difference at two sides of the valve is large, we should set a bypass-valve with metering hole.
5.Anti-condensation line
If you use the stainless steel centrifugal pump to deliver a fluid of high freezing point under room temperature, you should set a anti-condensation line to its preparatory pump and the pipelines to prevent clogging.
6.Safety valve line
For positive displacement pumps, such as electric reciprocation pump, gear pump, screw pump, we should set a safety valve at exit. If the pressure at exit is larger than the rated value, the safety valve will bounce up. And the fluid will move back toward the entrance.
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