made on basis of existing station or base practices,
local availability, and comparative costs.
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The pulley and belt drive shall be inspected and adjusted for the average
flow of feed solution desired. The capacity of the feeder shall be tested
for a period of not less than 2 hours nor more than 6 hours. The following
tests shall be made:
a.
Check the unit for leaks.
b.
Determine the amount of chemical solution used during the test run
to ascertain if the unit is functioning within the prescribed
limits of the feed rate indication plus 15 percent.
c.
The unit shall shut off automatically when the liquid elevation in
the chlorine contact tank drops below the contact sensing probes
and start when the water rises. The unit shall start and stop 10
times out of 10 consecutive starts.
3.10.3.6
Chlorinator Tests
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NOTE: Delete this paragraph when chlorinator is not
required.
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The unit shall be operated for a period of not less than 2 hours nor more
than 6 hours. The tests to be performed shall be as follows:
a.
The unit shall be checked for leaks. The shall be done by using
an aqueous ammonia solution on a cotton or cloth swab on a wooden
stick held close to all connections of the chlorinator.
b.
Determine the amount of chlorine used during the test run to
ascertain if the unit is functioning within the prescribed limits
of 4 percent of the set feed rate.
c.
The chlorinator shall be stopped when the water supply is
interrupted or shut off.
d.
When the gas supply is exhausted or shut off, there shall be no
back-flow of water into the unit.
3.10.3.7
Air Lift Pump
The air lift pump shall be tested for discharge capacity in liters per
second gallons per minute of clean water. This shall be based on
percentage of submergence of the eductor pipe to the total height of the
eductor pipe. The amount of air in L/s cfm required to lift 1.26, 2.52,
and 3.16 L/s 20, 40, and 50 gallons per minute of clear water shall be
determined. The air throttling valve shall be tested and adjusted to
provide the desired discharge rate. Test all joints in airline for leaks at
689.4 kPa 100 psi pressure.
3.10.3.8
Flow Measuring Equipment
V-notch weir shall be tested for accuracy of flow measurements as stated by
equipment manufacturer. Tests shall be made using clear water, using
SECTION 11375N
Page 121
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