MIL-HDBK-1164
Table 36 (Continued)
Frequency (1),
Inspection
Action
(2)
A
Diaphragm-
Check for leakage; disassemble unit,
pendulum unit
clean, and lubricate; check working
parts and cables; repack stuffing box;
check knife edges.
M
Mercury-float-type
Check at zero differential; adjust
rate-of-flow gages
indicator arm and recording pens;
check stop collars on cables.
Check accuracy and percent error; if
SA
greater than 3 percent, adjust.
Pressure
Check and clean as necessary.
SA
lines
Float chamber
Clean float and check mercury; paint
A
all parts requiring protection.
Piping and
Check for joint leaks; check pipe
M
valves
hangars and replace, if necessary;
paint as necessary.
(1) W-Weekly; M-Monthly; Q-Quarterly; SA-Semiannually; A-Annually; V-Variable,
as conditions may indicate.
(2) The frequencies shown are suggested frequencies that may be modified by local
command, as individual installation conditions warrant.
11.5.5.1
Filter Media
a)
Each month, drain the filter to the surface of the filter medium.
Inspect the surface for unevenness, sinkholes, cracks, and evidence of algae, mud
balls, or slime.
(1)
If depressions or craters on the surface area are of
appreciable size, dig out the sand and gravel, and locate and repair any break in the
underdrain system.
(2)
Remove mud balls manually or break them up with high-
pressure sprays.
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