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(v) 3404.2.9.5 Aboveground Tanks Outside of Buildings

Ohio Fire Code 2011 > Ohio Administrative Code 1301:7-7-34 Flammable and Combustible Liquids > 3404 Storage > 3404.2 Tank Storage > 3404.2.9 Aboveground Tanks > 3404.2.9.5 Aboveground Tanks Outside of Buildings

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Aboveground tanks outside of buildings shall comply with paragraphs (D)(2)(i)(vi)(a)(3404.2.9.6.1) to (D)(2)(i)(vi)(c)(3404.2.9.6.3) of this rule.

(a) 3404.2.9.5.1 Locations Where Aboveground Tanks Are Prohibited

The aboveground tank storage of flammable and combustible liquids, shall be prohibited on premises to which the public has access.

Exceptions:

1. At a bulk plant or terminal, the public may access the facility premises but shall be prohibited from the bulk storage and transfer operation area.

2. At a property that contains a fleet vehicle motor fuel dispensing facility, the public may access the property but shall be prohibited from the fleet vehicle facility.

(i) 3404.2.9.5.1.1 Location of tanks with pressures 2.5 psig or less.
Aboveground tanks operating at pressures not exceeding 2.5 psig (17.2 kPa) for storage of Class I, II or IIIA liquids, which are designed with a floating roof, a weak roof-to-shell seam or equipped with emergency venting devices limiting pressure to 2.5 psig (17.2 kPa), shall be located in accordance with Table 22.4.1.1(a) of NFPA 30 as listed in rule 1301:7-7-47 of the Administrative Code.

Exceptions:

1. Vertical tanks having a weak roof-to-shell seam and storing Class IIIA liquids are allowed to be located at one-half the distances specified in Table 22.4.1.1(a) of NFPA 30 as listed in rule 1301:7-7-47 of the Administrative Code, provided the tanks are not within a diked area or drainage path for a tank storing Class I or II liquids.

2. Liquids with boilover characteristics and unstable liquids in accordance with paragraphs (D)(2)(i)(vi)(a)(iii) (3404.2.9.6.1.3) and (D)(2)(i)(vi)(a) (iv)(3404.2.9.6.1.4) of this rule.

3. For protected aboveground tanks in accordance with paragraph (D)(2)(i) (vii)(3404.2.9.7) of this rule and tanks in at-grade or above-grade vaults in accordance with paragraph (D)(2)(h) (3404.2.8) of this rule, the distances in Table 22.4.1.1(b) of NFPA 30 as listed in rule 1301:7-7-47 of the Administrative Code shall apply and shall be reduced by one-half, but not less than 5 feet (1524 mm).

(ii) 3404.2.9.5.1.2 Location of tanks with pressures exceeding 2.5 psig.
Aboveground tanks for the storage of Class I, II or IIIA liquids 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) shall be located in accordance with Table 22.4.1.3 of NFPA 30 as listed in rule 1301:7-7-47 of the Administrative Code.

Exception: Liquids with boilover characteristics and unstable liquids in accordance with paragraphs (D)(2)(i)(vi)(a)(iv)(3404.2.9.6.1.4) and (D)(2)(i)(vi)(a)(v)(3404.2.9.6.1.5) of this rule.

(iii) 3404.2.9.5.1.3 Location of tanks for boilover liquids.
Aboveground tanks for the storage of liquids with boilover characteristics shall be located in accordance with Table 22.4.1.4 of NFPA 30 as listed in rule 1301:7-7-47 of the Administrative Code.

(iv) 3404.2.9.5.1.4 Location of tanks storing unstable liquids.
Aboveground tanks for the storage of unstable liquids shall be located in accordance with Table 22.4.1.5 of NFPA 30 as listed in rule 1301:7-7-47 of the Administrative Code.

(v) 3404.2.9.5.1.5 Location of tanks storing Class IIIB liquids.
Aboveground tanks for the storage of Class IIIB liquids, excluding unstable liquids, shall be located in accordance with Table 22.4.1.6 of NFPA 30 as listed in rule 1301:7-7-47 of the Administrative Code, except when located within a diked area or drainage path for a tank or tanks storing Class I or II liquids. Where a Class IIIB liquid storage tank is within the diked area or drainage path for a Class I or II liquid, distances required by paragraph (D)(2)(i)(vi) (a)(i)(3404.2.9.6.1.1) of this rule shall apply.

(vi) 3404.2.9.5.1.6 Reduction of separation distances to adjacent property.
Where two tank properties of diverse ownership have a common boundary, the fire code official is authorized to, with the written consent of the owners of the two properties, apply the distances in paragraphs (D)(2)(i)(vi)(a)(ii)(3404.2.9.6.1.2) to (D)(2)(i) (vi)(a)(v)(3404.2.9.6.1.5) of this rule assuming a single property.

(b) 3404.2.9.5.2 Separation Between Adjacent Stable or Unstable Liquid Tanks

The separation between tanks containing stable liquids shall be in accordance with Table 22.4.2.1 of NFPA 30 as listed in rule 1301:7-7-47 of the Administrative Code. Where tanks are in a diked area containing Class I or II liquids, or in the drainage path of Class I or II liquids, and are compacted in three or more rows or in an irregular pattern, the fire code official is authorized to require greater separation than specified in Table 22.4.2.1 of NFPA 30 as listed in rule 1301:7-7-47 of the Administrative Code or other means to make tanks in the interior of the pattern accessible for fire-fighting purposes.

Exception: Tanks used for storing Class IIIB liquids are allowed to be spaced 3 feet (914 mm) apart unless within a diked area or drainage path for a tank storing Class I or II liquids.

The separation between tanks containing unstable liquids shall not be less than one-half the sum of their diameters.

(c) 3404.2.9.5.3 Separation Between Adjacent Tanks Containing Flammable and Combustible Liquids and LP-gas

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)(vi)(b) (3404.2.9.6.2) 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. When flammable or combustible liquid storage tanks are within a diked area, the LP-gas containers shall be outside the diked area and at least 10 feet (3048 mm) away from the centerline of the wall of the diked area.

Exceptions:

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.
Horizontal separation is not required between aboveground LP-gas containers and underground flammable and combustible liquid tanks.

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