02-658-8 Me. Code R. § 11
The leg brackets welded on the tank are not considered a leg and may not be used to rest on the side of the reinforced concrete pad or solid concrete blocks.
Oil supply tanks shall not be installed on wood or other combustible surfaces.
The tank legs of an installation of an unenclosed supply tank(s) located inside a building(s) with a finished cement floor shall not exceed twelve (12) inches in height with floor flanges at the base of the steel legs. The use of shims is prohibited.
The installation of an unenclosed supply tank(s) located inside a building(s) without a finished cement floor must be supported by four 4 inch x 8 inch x 16 inch solid concrete blocks or a reinforced concrete pad. The pad must be at least three (3) inches thick, the width and length extending the full dimensions of the tank. The tank legs shall not exceed twelve (12) inches in height with floor flanges at the base of the steel legs. There must be a minimum of four (4) inches of clearance under the tank from any surface. The use of shims is prohibited.
The top of all of the fuel oil tanks on a multiple tank installation must be on the same horizontal plane.
Oil shut-off valves must be provided immediately adjacent to the burner supply connections at the bottom of the supply tanks.
The manifold at the cross connections of the burner supply line must be of steel, wrought-iron pipe or copper tubing. The manifold piping must be as close to the shut-off valves as possible so that the distance between the tank and the last fitting does not extend beyond six (6) inches from the face of the tanks and the final fitting (elbow or tee). See Figure 8-3.
On multiple tank installations, it is the installer's responsibility to ensure that return line product will not cause spillage.
When installing multiple fuel oil tanks with separate fill pipes and a common venting system, the requirement for increasing the vent pipe one pipe size larger than the largest individual vent pipe is not applicable.
When installing two tanks that are cross connected according to Figure 8.9.1 of NFPA 31, the gauge must be installed only in the vented tank and all burner supply piping from the tank outlet to the filter installed at the tank must be black iron pipe. The piping connected from the second tank may be either black iron pipe or copper tubing. If the filter is not located at the tank manifold, then copper tubing may be used to connect the black iron pipe manifold to the inlet of the filter.
When removing, replacing, or taking a tank out of service for any period of time, the oil tank fill and vent piping must be removed from the side of the building.
02-658 C.M.R. ch. 8, § 11