Section 658-109-11 - Outside Oil Supply Tanks1. 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). Click here to view Image
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.02- 658 C.M.R. ch. 109, § 11