MIL-HDBK-1138
Table 7 (Continued)
Problem
Solution
Move sampler location to
decrease exposure. Install
suction lines to give a
straight fall.
Flow measurement device
Use heat tape and glass fiber
freezes
insulation on flow
Insulate chamber and heat with
one lightbulb.
Put heat tape on Parshall
flume linkage.
Float for flow measurement
Heat with light bulb and
freezes
insulate.
Add antifreeze to float box.
Grit removal bypass channel
Temporarily switch flow to by-
freezes
pass channel, 30 min/day or
more often if needed.
Water freezing at comminutor
Build plexiglass structure to
keep influent warm.
Doors frozen shut on
Put heat tape around door
screening enclosure because
enclosure.
of condensation
Stairs above screw pumps
Plant policy requires all
are slippery from icing
operators to keep one hand
free at all times to use
rails.
Source: Taken in part from U.S. Army CRREL Special Report 85-11.
7.2.1
Screens and Grinders. Screens should be cleaned
more frequently during cold weather, either automatically on
timers or manually, since the screenings will freeze to the metal
bars. Once this occurs, removing screenings from the bars is
very difficult. Mechanical mechanisms may also become jammed and
inoperable. Weatherproofing or enclosing the area and providing
heat may be desirable.
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