02- 658 C.M.R. ch. 109, § 11 - Outside Oil Supply Tanks
1. Oil supply tanks
shall not be installed on wood or other combustible surfaces or
supports.
3. A horizontal oil
supply tank shall be mounted on steel pipe legs, not exceeding twelve (12)
inches in height with floor flanges at the base of the steel legs and be
supported by four (4), 4 x 8 x 16 inch reinforced concrete blocks, or a one (1) piece reinforced concrete pad not
smaller than the tank dimensions. The four (4) blocks or the pad shall rest on
a firm subgrade consisting of a bed of compacted, well draining gravel (6 inch
minimum), crushed stone (6 inch minimum), or some other subgrade approved by
the Board . See Figure 12(a). There must be a minimum of 4" of clearance under
the tank from any surface. See Figure 12(a)).
4. An upright or vertical tank shall be
mounted on steel pipe legs not exceeding twelve (12) inches in height, with
floor flanges at the base of the steel leg, and supported by a reinforced
concrete pad at least three (3) inches thick. The pad's width and length shall
not be smaller than the tank dimensions. The pad shall be of one (1) piece
construction. The pad shall rest on a bed of compacted, well draining gravel (6
inches minimum), crushed stone (6 inches minimum), or some other subgrade
approved by the Board . There must be a minimum of 4 inches of clearance under
the tank from any surface. See Figure 12(b).
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5. When installing a vertical fuel oil tank
in a listed secondary containment system, the four (4) inch clearance
requirement from the bottom of the tank to any surface may be reduced to a
minimum of one (1) inch.
6. The leg
brackets welded on the tank shall not be considered a leg and may not be used
to rest on the side of the reinforced concrete pad or reinforced concrete
blocks.
7. When a reinforced
concrete pad is fabricated on-site, the legs of the supply tanks shall not be
embedded as part of the pad.
8. In
all installations, the pipe flanges must be in direct contact with a reinforced
concrete pad or reinforced concrete blocks.
9. Tanks must be disposed of in accordance
with the Department of Environmental Protections Rules. Used, underground, oil
storage tanks are prohibited from use for aboveground supply of oil except
where a Maine registered engineer certifies that the tank meets the
requirements of UL 142 and NFPA 30.
10. Outside tanks and piping must be located
such that they are not subject to falling snow or ice. To meet this
requirement, the tank and outdoor piping must be
installed with a protective cover over the tank valve, oil filter, and any
piping which is either without structural support or not attached to the side
of the building.
11. All outside
supply tanks shall be held to the same standards as newly installed
tanks.
12. For a single-tank
installation, the fuel supply line cannot extend more than twelve (12) inches
beyond the face of the tank.
Notes
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