Submersible Borehole Pump Selection For Deep Wells - KSB S 100D Booklet

Submersible Borehole Pump Selection for Deep Wells

Pump Selection
The following data are required for a first rough selection of a
submersible borehole pump:
3
-- Capacity Q in m /h (l/s)
-- Pressure at well head H
-- Well diameter in inches or mm
-- Temperature of fluid handled t
-- Pump head H in m
P
While Q, H , D and t are usually specified by the customer, the
A A
head H to be developed by the pump needs to be calculated.
P
There are two typical applications to be considered (see the
drawing on the right):
1. Pumping into an open overhead tank
H = H + H + H + H
v
P A t S
where ...
H = Required pressure at well head
A
H = Lowest water level (dynamic water level)
t
H = Head losses in the check valve (see characteristic
v
curves for different stage numbers for UPA 150S
and above).
H = Head losses in riser pipe up to well head
S
(see page 10).
H = Installation depth
e
2. Pumping into a closed tank
H = H + H + H + H + p
p t v
A S
where ...
p = Gauge pressure (also air cushion) in a tank
ü
Example
Given ...
3
Q = 120 m /h,
A
H = 95 m,
A
t = + 15 °C,
A
50 Hz, 400 V and d.o.l. starting,
well diameter D = 250 mm (10 inches).
Found ...
1. step:
pump type UPA 200B/250C
(for Q taken from selection chart on page 4)
A
2. step:
pump size UPA 200B - 130
(for Q taken from selection chart on page 50)
A
3. step:
pump set UPA 200B-130/6b + UMA 200D 45/21
(for H = H + H + H + H
p A t V
with H taken from characteristic curves for different stage
V
numbers on page 61).
Pump efficiency: η = 80.5 % (without check valve)
P
8
in m
A
in °C
A
[m]
[m]
ü
= 95 + 4 + 0.75 + 0.26 = 100 m
S
50 Hz Submersible Borehole Pumps
Figure:
Deep well with submersible borehole pump and overhead tank
or closed tank at a pressure above atmospheric pressure of p
3300:54/3
ü.