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The minimum horizontal separation between an LP-gas container and a Class I, II or IIIA liquid storage tank shall be 20 feet (6096 mm) except in the case of Class I, II or IIIA liquid tanks operating at pressures exceeding 2.5 psig (17.2 kPa) or equipped with emergency venting allowing pressures to exceed 2.5 psig (17.2 kPa), in which case the provisions of paragraph (D)(2)(i)(v)(b)(5704.2.9.5.2) of this rule shall apply.
Dikes, diversion curbs, grading or other method approved by the fire code official shall be provided to prevent the accumulation of Class I, II or IIIA liquids under adjacent LP-gas containers. Where flammable or combustible liquid storage tanks are within a diked area, the LP-gas containers shall be outside the diked area and not less than 10 feet (3048 mm) away from the centerline of the wall of the diked area.
Exceptions:
  1. Liquefied petroleum gas containers of 125 gallons (473 L) or less in capacity installed adjacent to fuel-oil supply tanks of 660 gallons (2498 L) or less in capacity.
  2. Horizontal separation is not required between above-ground LP-gas containers and underground flammable and combustible liquid tanks.

Related Code Sections

3804.3 Ohio Administrative Code 1301:7-7-38 Liquefied Petroleum Gases, Container Location
BETWEEN LP-GAS CONTAINERS AND BUILDINGS, PUBLIC WAYS OR LOT LINES OF ADJOINING PROPERTY THAT CAN BE BUILT UPON MINIMUM SEPARATION BETWEEN LP-GAS ...