|
| |
2-3.2 Materials of Construction - Cont'd.
seal is to tape the joint with two to four-inch self-adhering plastic tape. If a drain line penetrating the berm is used (see
para. 2-3.5), a section of the liner must be pierced and tied tightly with synthetic cord around the drain pipe or otherwise
sealed so as to avoid washout or leakage at this point. Another acceptable sealing method is to use two to four inch wide
plastic self-adhering tape, overlapping the liner and the pipe. Sealing tape and plastic sheeting are not supplied with the
TPT, NSN 3835-01-182-1976.
2-3.3 5,000 Barrel Tank Berms
The dimensions of a 5,000 bbl. fabric collapsible tank are:
a. Dry: 68 ft. 6 in. x 68 ft. 6 in.
b. Filled: 6 ft. 8 in. x 66 ft. x 66 ft.
The minimum dimensions of berm should be:
c. From toe of berm to tank wall when filled, 4 ft.
d. Berm height, to contain full tank with 1 ft free-board, 5 ft. 6 in.
2-3.4 50,000 Gallon Tank Berms
The dimensions of a 50,000 gallon fabric collapsible tank are:
a. Dry: 26 ft. x 66 ft.
b. Filled: 5ft. 8in. x24ft. x64ft.
The minimum dimensions of berm should be:
c. From toe of berm to tank wall when filled, 3 ft.
d. Berm height, to contain full tank with 1 ft. free-board, 4 ft. 6 in.
2-3.5 Berm Basin Drain
To provide a drain for the basin formed by the berms, a 2-inch or larger pipe with a gate valve (used pipe and valves of
any rating are acceptable) on the outboard end may be installed in the bottom of the berm at the lowest end of the tank
pad (see Fig. 2-8 and 2-9). The valve must be normally closed and opened only to drain water from the bermed area. If
a drain is not installed, the basin inside the berms may have to be pumped from time to time, depending on the
permeability of the soils and whether or not a sealing liner is installed. Drain pipe and valves are not supplied with the
TPT, NSN 3835-01-182-1976.
2-3.6 Other Information
For additional information, see TM 5-5430-210-12, overpacked with the 50,000 gal. tanks and the technical manual
published by ILC Dover and overpacked with the 5,000 bbl tanks. It is noted that the recommendations in paragraph 2-
3.1 through 2-3.6 and the associated drawings differ some and are considered an improvement over the information in
TM 5-5430-210-12. The tank pad slope recommendations will permit better pump out and drainage of the fabric tanks.
2-15
|
