QJ Deep Well Pump Selection and Deep Well Pump Head Calculation

QJ wholesale deep well pump selection notes:
(1) the actual depth of the well H, the hydrostatic level Hi, the water depth H and the borehole diameter.
(2) According to the pumping test, the maximum possible effluent Qmax and the corresponding maximum water level decrease are obtained. The water level drop Sq, or Sq = SmaxQmax, is obtained when the unit flow is obtained.
In the absence of accurate pumping test data, Qmax can be estimated as follows:
Qmax = (2H-Smax) SmaxQ (2H-S) S
Where H - well depth, m;
Q-pumping experiment in the water level is stable, the well in the water, msh;
S corresponds to the water level drop in the Q, ie the distance between the hydrostatic level and the stable water level, m;
Smax-well the maximum water level drop, m, generally H2;
Qmax - the maximum possible amount of water corresponding to Smax, m3h.
QJ deep well pump selection steps:
(1) to determine the model of QJ deep well pump according to the well bore diameter and well depth preliminary selection of deep well pump model. If the borehole diameter is 200mm, only 8JD or SD8 deep well pump can be used to keep enough clearance between the well and the pump.
(2) Seeking water level drop According to the selected model, refer to the product sample, find the rated flow Qe, according to the following formula to find the water level drop.
SM = SqQe (6-40)
Where SM-water drop, m, SM ≤ H2.
(3) to find the depth of the water level according to the following formula to find the corresponding water level
Hd = Hi + SM (6-41)
(4) Calculate the total length of the QJ deep well pump in the well
L = Ha + (1 ~ 2) (6-42) where the total length of the L-water pipe, m.
The L value obtained should not be greater than the maximum length of the wellhead given in the product sample.
(5) the total loss of the head according to the diameter and flow of water pipes, found every 10m long water pipe friction
Loss of h value, then the total loss of water pipes:
△ Hz = 0.1hL (6-43) where the total loss of L-water pipe head, m.
(6) to raise water required head
Hx = Hd + ΔHz (6-44)
Where Hx - QJ deep well pump water to the head of the wellhead required. If the water is taken to a certain height from the ground, then the above formula Hx also added to the ground above a section of pipeline water loss.
(7) to determine the impeller series and pump head based on the Hx, check the product samples to determine the pump impeller series, so that the pump rated head is not less than Hx, that is, He = KHx. Where K is the reserve factor, about 1.1 to 1.2.