*TM 5-813-1/AFM-88-10, Vol. 1
Table 5-5. Characteristics of pumps used in water supply systems.
Source: Manual of Individual Water Supply Systems, UDHEW.
Practical
Usual well-
Usual
Type of Pump
suction
pumping
pressure
Advantages
Disadvantages
Remarks
lift
depths
heads
b. Submersible tur-
Pump &
50-400 ft.
80-900 ft.
1. Same as shal-
1. Repair to mo-
1. Difficulty w/seal-
bine
motor sub-
low well turbine.
tor or pump re-
ing has caused un-
(multi-stage)
merged
2. Easy to frost-
quires pulling
certainty as to
proof installa-
from well.
service life to date.
tion.
2. Sealing of
3. Short pump
electrical equip-
shaft to motor.
ment from water
vapor critical.
3. Abrasion from
sand.
Jet:
1. Shallow well
15-20 ft.
Up to 15-20
80-150 ft.
1. High capacity
1. Capacity re-
below ejec-
feet below
at low heads.
duces as lift in-
tor
ejector.
2. Simple in op-
creases.
eration.
2. Air in suction
3. Does not have
or return line
to be installed
will stop pump-
over the well.
ing.
4. No moving
parts in the well.
2. Deep well
15-20 ft.
25-120 ft.
80-150 ft.
1. Same as shal-
1. Same as shal-
1. The amount of
below ejec-
200 ft.
low well jet.
low well jet.
water returned to
tor
maximum
ejector increase w/
increased lift-50%
of total water
pumped at 50 ft. lift
& 75% at 100 ft. lift.
Rotary:
1. Shallow well
22 ft.
22 ft.
50-250 ft.
1. Positive ac-
1. Subject to
(gear type)
tion.
rapid wear if
2. Discharge con-
water contains
stant under vari-
sand or silt.
able heads.
2. Wear of gears
3. Efficient oper-
reduces effi-
ation.
ciency.
2. Deep well
Usually
50-500 ft.
100-500 ft.
1. Same as shal-
1. Same as shal-
1. A cutless rubber
(helical rotary type)
submerged
low well rotary.
low well rotary
stator increases life
2. Only one mov-
except no gear
of pump. Flexible
ing pump device
wear.
drive coupling has
in well.
been weak point in
pump. Best adapted
for low capacity &
high heads.
1
Practical suction lift at sea level. Reduce lift 1 foot for each 1,000 feet above sea level.
(3)
Capacity selection.
The design
capacity for their particular pumps at various operating
capacity of the pump must exceed the system
pressures. The total dynamic head (TDH) of the system
requirements. However, the capacity of the pump must
must be calculated accurately from the physical
not exceed the capacity of the well.
Pump
arrangement and is represented by the following
manufacturers publish charts giving the pump discharge
equation:
5-18
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