MIL-HDBK-1005/9A
structural integrity of the LET. For interior surfaces, a coal
tar epoxy coating system, similar to Carboline Carbomastic 14,
is recommended.
These coatings are typically two component mixtures
with a curing agent added just prior to use. The coating should
have a high build characteristic, allowing application thickness
of 8 to 10 mils. Two coats should be applied for a total dry
thickness of at least 16 mils.
For exterior surfaces, a flexible epoxy-amine coating
system, similar to Carboline 188, is recommended. The system
should consist of two or three coatings: a primer and a high
build finish coating; or a primer, an intermediate high build
coating, and a finish coating. For either combination, the
system should have a total dry film thickness of at least 10 to
11 mils.
3.10.3
API Separator. Use methods and criteria given in API
Manual on Disposal of Refinery Wastes, Volume on Liquid Wastes,
to design API separator, subject to the limitations presented in
Table 14. For general arrangement and vertical slot inlet
baffle detail, refer to the API Manual and Figures 18A and 18B.
3.10.4
Induced Gravity Separator. The induced gravity
separator removes free and dispersed oil to produce an effluent
that has 10 to 50 ppm oil. The oil is removed by passing water
at laminar velocity through a pack of closely spaced plates on
an incline of 45 to 55 degrees. The oil droplets rise and are
trapped along the bottom of the plates. The oil droplets
coalesce and gradually move upward along the bottom of the
plates, eventually collecting at the surface of the tank.
Suspended solids settle to the bottom. The separator should
have adequate capacity in the sludge well to collect these
solids and should have a sludge pump. An automatic valve, if
sludge transfer is by gravity displacement, should be provided
and operated frequently to avoid excessive buildup. Refer to
Figure 19 for alternative types of induced gravity separators.
Specific design features of induced gravity separators vary
among manufacturers.
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