*TM 5-813-1/AFM-88-10, Vol. 1
two pumps will be capable of supplying raw water at a
source, a sufficient number of the pumps must be
rate equal to the rated capacity of the plant. To ensure
equipped for emergency operation when normal electric
water service in the event of a major power outage, a
power is not available. Emergency power can be
sufficient number of pumps must be equipped for
provided by gas-turbine or diesel engine generators or by
operation when normal electric power is not available.
engines arranged to provide for pump operation by direct
These pumps will be capable of supplying at least 50
engine drives during the emergency. These standby-
percent of the rated capacity of the treatment plant,
powered pumps will be capable of supplying at least 50
except where greater capacity is essential. Standby
percent of the required daily demand, except where
power for emergency operation can be provided by
greater capacity is essential.
gasturbine or diesel engine generators or by engines
arranged to provide for pump operation by direct engine
8-3. Electric power
drives during the emergency.
If dual electric power feeders, breakers, transformers
and switchgear can be provided, they will increase the
8-2. Ground water sources
station's reliability but may add appreciably to its cost. If
For most applications, either vertical line shaft turbine
a high degree of reliability is deemed necessary, the
pumps or submersible turbine pumps (see para 1-3b for
station should be served by independent transmission
definitions) will be used. For small-capacity or low-head
lines that are connected to independent power sources
applications, rotary or reciprocating (piston) pumps may
or have automatic switchover to direct drive engines.
be more appropriate. Factors influencing the selection of
pumping equipment include well size, maximum
8-4. Control of pumping facilities
pumping rate, range in pumping rate, maximum total
Supervisory or remote control of electric motor-driven
head requirements, range in total head requirements,
pumping units will be provided if such control will
and type of power available. Final selection of pumping
substantially reduce operator time at the facilities. Life
equipment will be based on life cycle cost considerations.
cycle cost will apply.
If all pumps use electric power as the primary energy
8-2
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