(4) Close the petcock on the discharge elbow when water begins to flow out of the petcock.
(5) Notify operators on the lead pump station to shut down pump operation.
(6) Close the butterfly valve on the boost pump discharge hose to contain water column.
c. Begin moving water when the next downline station is installed and connected to the hose line.
Repeat the applicable steps above. Start up the lead pump and the first boost pump. en the water column
reaches the second boost pumping station, close the petcock on the discharge elbow, shut down the pumps, and
cease operation of the system. Close the butterfly valve on the second boost pump discharge hose to contain the
water column.
d. Continue packing the hose line as each boost pumping station is installed and connected.
e. Complete operation of the TWDS can begin as soon as all pumping stations. storage assemblies, and
distribution points have been installed.
f. During start-up of the complete system, run all pumps in manual or electric manual mode. After
start-up, boost pumping stations can be operated in the electric automatic mode. However, the lead pump
should always be operated in manual or electric manual mode.
g. Maintain the pump discharge pressure at 150 5 PSI when the pump suction pressure is above 20
PSI.
h. Reduce the engine speed to idle to prevent pump discharge pressure from exceeding 155 PSI when
the pump suction pressure rises above 120 PSI.
i. Ensure the lead pumping station is permanently manned during TWDS operation. The boost
pumping stations operating in the electric automatic mode require only periodic monitoring and refueling.
j. Service each of the boost pumping stations every three hours while the TWDS is operating.
k. Use a check valve on the discharge line of all pumps.
l. When storage ranks are approaching maximum holding capacity, reduce speed on the lead pump to
decrease the rate of downline water flow. If operating in the electric automatic mode, the rate of boost pump
should decrease automatically. If boost pumps are operating in the manual or electric manual modes, operators
will have to manually reduce the pump speed. When storage tanks are filled to maximum capacity, close the
gate valve on each storage assembly and shut down the operation of the pumping stations.
m. Start distribution operations at the distribution points when storage tanks contain enough water to
allow a normal discharge rate.
n. Monitor pumping rates during operation. Rates will vary, depending on the amount of water being
discharged at either the distribution points, or the large scale storage and distribution units, or both. Operate the
pumping stations at intervals long enough to refill storage tanks if discharge rate is minimal. When water is
being pumped on a continual basis and boost pumping
QM4918
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