Regarding the pump head
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One question is this: for example, if the pump’s head is 50 and the outlet pressure is 0.5 Mpa, then if the inlet pressure is 0.3 Mpa, will the outlet pressure still be 0.5 Mpa? And if the inlet pressure is 0.5 Mpa, will the outlet pressure also be 0.5 Mpa?
The head of a pump, at a constant rotational speed of the centrifugal pump, decreases as the outlet flow rate increases, and it is independent of the inlet pressure； It is recommended to study the characteristic curve of centrifugal pumps ； 1# gegegewu
Generally, the outlet pressure of a pump is roughly equal to the inlet pressure plus the head.
By referring to the pump’s characteristic curve and applying Bernoulli’s equation, it can be calculated easily.
If the inlet pressure is 0.3 Mpa and the head is 50, then the outlet pressure should be 0.8 Mpa. If the inlet pressure is 0.5 Mpa, the outlet pressure will be 1.0 Mpa. The pump’s outlet pressure can be roughly calculated as: head + inlet pressure of the pump.
Floor 5 explained it very clearly. A pump can be regarded as a unit that provides energy, and the energy it provides is the head. It is the increased energy based on the import pressure. I think you understand now.