How to know the specific working head of deep well submersible pump

How to know the specific working head of deep well submersible pump
The so-called submersible pump working head refers to the submersible pump installation project has been completed, is running the pump head.
From (3-2) we can see that the pump head H = E2-E1. The horizontal centrifugal pump shown in Figure 4-1 is analyzed. Take the surface 0-0 of the suction pool as the datum, list the energy equation of the pump inlet section 1-1 and the submerged pump outlet section 2-2. The head is
H = E2-E1
Where zl, - the position head, the absolute pressure head and the velocity head (m) corresponding to the end face 1-1;
Corresponds to the position head, the absolute pressure head and the velocity head (m) at section 2-2.
In order to view the work of the submersible pump head, in the submersible pump inlet and outlet sections were installed at the vacuum gauge and pressure gauge. Vacuum and pressure gauge readings for the relative pressure, there are
P1 = Pa - Pv
P2 = pa + pd
Where pa - atmospheric pressure (Pa);
Pv - vacuum meter reading (Pa);
Pd - pressure gauge reading (Pa).
Because the submersible pump suction pipe and pressure pipe diameter is basically the same, so u1, u2 difference is very small,
Can be ignored; the actual project △ Z is also very small, can also be ignored. (4-5) in the practical application can be written as
H = Hv + Hd (4-6)
Formula (4-6) is the work of the submersible pump working head calculation formula, that is, as long as the running pump vacuum gauge and pressure gauge readings (by mHO total), you can get the work of the corresponding pump head pressure.