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| MIL-H-12732E
Test procedure shall be as follows:
Adjust range valve to range A position.
h.
Open downstream back-pressure
Set up Condition Al (table I) as follows:
i.
valve. Open inlet line valve and adjust backpressure valve until indi-
cated flow rate is 350 gpm with a discharge pressure of 100 psig plus or
minus 2 psig.
With Condition Al established, make a test run in the following manner:
j
Start timing the run, using a stopwatch, just as a suction stroke is
1.
completed by the diaphragm pump.
2.
Immediately read the solution graduate and record the data.
During the run, observe the pressure drop across the unit. The
3.
pressure drop shall not exceed 18 psig (36.6 inches of mecury [in.
Also measure total wastewater from diaphragm pump. The volume
Hgl).
of wastewater shall not exceed 0.6 gpm (2,270 cubic centimeters per
minute [cc/rein]). Measure water meter flow by use of totalizer on
meter and stopwatch. Time for approximately 1 minute. Record water
meter flow in gpm.
4.
Continue the run until the diaphragm pump has completed 24 strokes.
Record the total time in minutes, seconds, and tenths of a second.
Immeaditely at the end of the run, read the solution graduate and
5.
record the data.
6.
Do not change adjustment of range valve.
7.
Divide the number of cc withdrawn from the graduate by the number of
strokes (24). The pumpage rate per stroke shall be between 12.0 and
16.5 cc.
8.
Divide the number of cc withdrawn from the graduate by the number of
minutes for the run to get a pump rate in cc per minute (cc/rein).
Divide the pump rate (cc/rein? by the main flow rate (gpm) to secure a
9.
Record this figure.
solution application rate in cc/gallon.
Set up Condition A2 (table I) in the same manner as above with a flow
k.
Do not change range
rate of 210 gpm at a discharge pressure of 100 psig.
valve or dosage control settings. Repeat steps j.1 through j.9 except a
maximum drop of 7 psi (14-1/4 in. Hg) is allowed in step 3.
1.
Set up Condition A3 (table I) in the same manner with a flow rate of
70 gpm at a discharge pressure of 100 psig. Do not change range valve
Repeat steps j.1 through j.9, except maxi-
or dosage control settings.
mum pressure drop of 7 psi (14-1/4 in Hg) is allowed in step 3.
Compare the solution application rates for Conditions Al through A3 .
m.
Compare the pump
They should be alike within a range of +10 percent.
They should be
rate figures recorded for Conditions Al-through A3.
proportional within +10 percent.
n.
Adjust range valve to range B position.
Set up Condition B1 (table I) by adjusting backpressure valve until
0.
indicated flow rate is 70 gpm with a discharge pressure of 25 psig
+2 psig.
Make test run for Condition B1 by performing test in same manner as
P"
specified in steps j.1 through j.9.
13
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