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2-2.6 50,000 Gallon Tank TPT Optional Configuration Plot Plan - Cont'd.
to replace or supplement the 5,000 bbl tanks in a fuel module or under some conditions in a completely separate area.
Figure 2-7 shows a possible layout utilizing all six fuel tanks.
b.
Note that no pump is included with the option, so installation plans will need to include a source of pump power
(4-inch to 6-inch adapters are included with the option). For this purpose, one of the 600 gpm hoseline pumps may be
used (see para. 2-4.3). Alternatively, one of the 1250 gpm flood and transfer pumps normally supplied with the
associated pipeline system may be used (see para. 2-4.5).
c.
Each pair of 50,000 gallon tanks will require a leveled area approximately 105 ft. x 100 ft. (96 ft. x 87 ft. if
sand bags are used).
d.
If less than six tanks are required at a particular location, the layout can be modified as necessary.
2-3 Typical Pad and Berm Design
All tanks are installed on pads inside berms (firewalls) to contain any spills and isolate any fire resulting from such spills.
The following are basic design criteria for tank berms. Refer to Fig's. 2-8, 2-9, and 2-10 for additional graphic
information.
2-3.1 Sites
Sites for tanks and their berms should be carefully selected,, giving consideration to space, terrain, soil consistency,
camouflage and accessibility. Once the site is selected, it should be cleared and graded such that there can be
approximately 10 slope in the final tank pad toward the location of the drain assembly that is closest to the tank's pump
suction fitting. All sharp objects, rocks, sticks, etc. that might puncture the fabric tank must be removed.
2-3.2 Materials of Construction
a.
Berms are normally constructed of earth from the surrounding area. The more impermeable the soil the better.
A high clay content is desirable to avoid leakage and keep the berm in shape. Some rock and gravel content will tend to
avoid washout.
b.
Berms may be constructed of sand bags if site conditions preclude earth construction, however, sand bag berms
will not hold a tank spill very well unless action is taken to seal the gaps between bag ends. Heavy clay packing between
joints will help. Nevertheless, considerable leakage can take place. An alternative to sandbag construction is the use of
sand confinement grids, NSN 5680-01-198-7955, with a construction procedure similar to AFCS Dwg. 14910 KM-KP.
Sandbags are supplied with the TPT, NSN 3835-01-182-1976.
c.
Tank pads and berms may be lined with a heavy gage plastic sheeting if soil permeability is a problem at a
particular site. Construction grade low density polyethylene preferably with a fibre net molded in, is acceptable. Care
must be taken to adequately overlap and, if possible, seal the joints and then hold them down with a light earth fill over
the liner. Low density polyethylene can be heat sealed at the joints if time and site conditions permit it prior to the advent
of fuel to the area. Another acceptable method of
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