Seeking advice: How to select an inlet pressure gauge for a centrifugal pump?
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A recent project required pressure gauges to be installed at both the inlet and outlet of the pump. But how is the inlet pressure of the pump determined? What is being made now is a transfer pump for a storage tank; the tank is about 3 meters high. In such a case, the inlet of the pump must be under positive pressure, right?
Check whether there is positive pressure or negative pressure on the liquid surface
Under normal circumstances, storage tanks are generally considered to be at atmospheric pressure or slightly positive pressure. So, the original poster only needs to calculate the maximum pressure of the liquid inside the tank.
Generally that’s the case; usually, there is a possibility of negative pressure
https://bbs.hcbbs.com/thread-1764877-1-1.html It is necessary to calculate the inlet pressure of the pump, taking into account both the highest and lowest liquid levels; this will allow the measurement range to be determined. By adding a certain margin, it becomes possible to select the appropriate gauge. Let me calculate it with my watch
It is relatively easy to determine the range for the pressure gauge at the inlet of a centrifugal pump: the pressure above the liquid level plus the pressure resulting from the liquid level at the pump inlet (liquid level height × density × 9.81), with some extra margin added as well. But could you please explain why a pressure gauge is installed at the inlet?
P=ρgh+P0; if P0 is the atmospheric pressure, then it’s simply ρgh. The range should be set within 1.5 to 2 times this value. For high precision, choose remote transmission
This belongs to the process parameters; please ask the process engineers