MIL-HDBK-1138
mechanical settings. Items suggested for inspection and a
recommended frequency for inspection are listed in Table 3.
System users must also be familiar with the capacity of the
separator and holding tanks, uses of the system, and its
potential misuses to be able to determine requirements for
periodic draining and cleaning.
Table 3
Recommended Inspection Points for Oil/Water Separators
Item
Suggested Frequency
Conventional Gravity Separator
Flight mechanism: flights,
Visual weekly; detailed
chains, sprockets, rails, drive
annually
Sludge hopper valves:
Weekly
open/close freely, close tight
Oil skimmer mechanism: moves
Weekly
freely, level, not plugged
Skimmings pump(s)
Weekly
Sludge pump(s)
Weekly
CPI Separator
Parallel plates: fouling
Weekly
Skimmer weir: level
Annually
Skimmings pump(s)
Weekly
Sludge pump(s)
Weekly
Flotation
Surface skimmer mechanism:
Visual weekly; detailed
drive, flight, roller, beach
annually
Bottom rake: flight
Annually
Pressurization pump and tank
Weekly
Back pressure valve: holds
Weekly
recommended back pressure
Sludge valve: operates freely,
Weekly
closes tightly
Skimmings/bottoms pump(s)
Weekly
Separator performance can be an important indicator of
the mechanical condition of the device. Performance can be
tracked by regular influent and effluent sampling and analysis.
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