TM 5-809-6/AFM 88-3, Chap. 6
Protection Agency and local agencies who would have
and 15072.01D. Other acceptable standard design methods
jurisdiction for privately developed projects.
or concepts may also be used.
(a) Earth cover. Earth cover will be provided over
(b) Prestressed concrete tanks. Design of prestressed
the top of tanks in accordance with frost penetration
concrete tanks will be in accordance with ACT 344R. Other
requirements (considering concrete distribution slab
current acceptable methods may also be used.
(5) Petroleum, oil and lubricant (POL) tanks and
thickness) but will be not less than 2 feet 6 inches.
(b) Backfill material. Backfill for underground tanks
facilities. Design of POL tanks will be in accordance with
will include a &inch course of inert sand or fine gravel
(6) Water storage tanks. Design of water storage tanks
placed against exposed exterior surfaces.
(4) Concrete tanks and reservoirs. Tanks and reser-
will be in accordance with applicable American Water
voirs designed to contain fresh water and other non-
Works Association publications but subject to specific
deteriorating substances will have a clear cover over the
design restrictions as set forth above.
(7) Tanks for other than oil or water. The basis for
reinforcement of not less than 1-1/2 inches for slabs and 2
inches for beams and girders or shall be constructed using
design of steel tanks will be API 650, but special considera-
conventional depth of cover but with surface sealants or
tions related to the product stored in the tank must be
coated reinforcing or both. A minimum temperature dif-
accounted for. Steel tanks to store liquefied gases at or near
ferential of 40 degrees F will be assumed to exist between
atmospheric pressures will be designed in accordance with
inside and outside faces of tank walls.
API 620. Storage of corrosive solutions and the effects of
(a) Reinforced concrete tanks. Design of reinforced
temperature in conjunction with corrosive solutions will be
concrete tanks will be in accordance with PCA 15003.02D
considerations in selecting tank materials.