MIL-PRF-12732F
wastewater from diaphragm pump. The volume of wastewater shall not
exceed 0.6 gpm (2,270 cubic centimeters per minute [cc/min]). 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.
5. Immediately at the end of the run, read the solution graduate and 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 Divide the number of cc withdrawn from the graduate by the number of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 Divide the number of cc withdrawn from the graduate by the number of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/min).
9. Divide the pump rate (cc/min) by the main flow rate (gpm) to secure a
solution application rate in cc/gallon. Record this figure.
k.
Set up Condition A2 (table I) in the same manner as above with a flow rate of
210 gpm at a discharge pressure of 100 psig. Do not change range valve or dosage
control settings. Repeat steps j.l through j.9 except a maximum drop of 7 psi
(14-1/4 in. Hg) is allowed in step 3.
l.
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 or dosage control settings.
Repeat steps j.l through j.9, except maximum pressure drop of 7 psi (14-1/4 in Hg) is
allowed in step 3.
m.
Compare the solution application rates for Conditions Al through A3. They should be
alike within a range of 10 percent. Compare the pump rate figures recorded for
Conditions A1 through A3. They should be proportional within ±10 percent.
n.
Adjust range valve to range B position.
o.
Set up Condition Bl (table I) by adjusting backpressure valve until indicated flow rate
is 70 gpm with a discharge pressure of 25 psig ±2 psig.
p.
Make test run for Condition Bl by performing test in same manner as specified in
steps j.l through j.9.
q.
Set up Condition B2 (table I) in the same manner as above with a flow rate of
42.5 gpm at discharge pressure of 25 psig. Do not change range valve or dosage
control settings. Repeat steps j.l through j.9.
r.
Set up Condition B3 (table I) in the same manner as above with a flow rate of 15 gpm
at a discharge pressure of 25 psig. Do not change range valve or dosage control
settings. Repeat steps j.l through j.9.
s.
Compare the solution application rates for Conditions B1 through B3. They should
be alike within a range of ±10 percent. Compare the pump rate figures recorded for
Conditions Bl through B3. They should be proportional within ±10 percent.
t.
Adjust range valve to range C position.
u.
Set up Condition Cl (table I) by adjusting backpressure valve until indicated flow rate
is 15 gpm with a discharge pressure of 25 psig ±2 psig.
v.
Make test run for Condition Cl in same manner as specified in steps j.l through j.9.
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