MIL-HDBK-1164
(4)
Disassemble the unit in order to clean and lubricate it when
necessary. Check the working parts and the cables (they should be free of knots,
splices, or fraying). Repack the stuffing box if it is leaking. Make sure that the knife
edges rest solely on their edges when the pendulum is hung vertically and be sure that
all cable ends are knotted tightly.
c)
Mercury-Float-Type Rate-of-Flow Gages. General maintenance
procedures are outlined below. For more detailed procedures, consult the
manufacturer's instructions.
(1)
Once a month, check the unit by opening the equalizing
valve to eliminate the differential pressure in the gage. Adjust the indicator, the
recording pens, and the register to zero. Check the position of the stop collars on the
cables. Also, inspect and clean the stops on the indicator and recording pen.
(2)
Every 6 months, check the accuracy of the rate-of-flow
gages in the following way. Determine the exact time for the water to drop 1 foot
(30 cm), using hook gages. Determine the amount of water in this 1-foot (30-cm) depth
(calculate, allowing for inlets, gullets, structural members, etc., or measure the input, if
possible, from the wash water rinse or the drop in the level of the wash water tank).
During the period timed for the drop in the water level of 1 foot (30 cm), note and record
the reading of the flow rate. Calculate the rate of flow and percent error, according to
the following equations:
V 60
Gallons per minute =
T
Where:
V = volume in 1 foot depth of water (gallons or liters)
T = drop time (seconds)
F1 - F2
Percent =
100
F2
Where:
Percent = percent of error
F1 = indicated flow rate (gpm
or liters per minute [L/min])
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