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(a) The provisions of this section shall not apply to buildings each occupied by one (1) tenant and used for the processing or manufacturing of flammable liquid, provided such buildings are adequately isolated from other premises and do not present a conflagration hazard to the community.
(b) Except as provided in subsection (a) hereof, tanks for Class III liquid larger than sixty (60) gallon capacity shall not be located above the lowest story of any building. No inside storage tank for Class III liquid shall be located within seven (7) feet horizontally of any open flame.
(c) In buildings of Class III, exterior protected construction, or Class IV, wood construction, the nominal aggregate capacity of such tanks for Class III liquid shall not exceed five thousand (5,000) gallons unless installed as provided in subsection (e) hereof.
(d) In buildings of Class I, fireproof, or Class II, incombustible construction, the nominal aggregate capacity of such tanks for Class III liquid shall not exceed fifteen thousand (15,000) gallons unless installed as provided in subsection (e) hereof.
(e) In any building, if within or buried below a fire-resistive detached room cut off vertically and horizontally in an approved manner by means of an incombustible separation having a fire resistance rating of not less than four (4) hours, the nominal aggregate capacity of such tanks for Class III liquid shall not exceed fifty thousand (50,000) gallons, with no individual tank capacity extending twenty-five thousand (25,000) gallon capacity. Such room shall be so constructed and openings to such room shall be so located that the room will serve as a dike to retain any leakage or seepage.
(f) Except as provided in subsection (a) hereof, tanks for Class III liquid located inside buildings shall not exceed two hundred seventy-five (275) gallons individual capacity or five hundred fifty (550) gallons aggregate capacity in one (1) building or fire area unless installed at least three (3) feet below a concrete floor of the lowest floor level, or installed in the lowest story within or below a fire-resistive detached room as provided in subsection (a) hereof, or in an enclosure or casing constructed as follows:
(1) The walls of the enclosure shall be constructed of reinforced concrete at least six (6) inches thick or of brickwork at least eight (8) inches thick, and shall be bonded to the floor. The space between the tank and the enclosure shall be completely filled with sand or well tamped earth. When the floor or other construction immediately above the tank is of fire-resistive construction capable of safely sustaining a load of one hundred fifty (150) pounds per square foot, the walls of the enclosure shall be carried to a height not less than one (1) foot above the tank and the space above the tank filled with sand or well tamped earth to the top of the wall; otherwise the enclosure shall have a top of reinforced concrete at least five (5) inches thick, or a top of equivalent construction.
(2) Instead of the enclosure described in subsection (f)(1) hereof, the tank may be encased in reinforced concrete not less than six (6) inches in thickness, applied directly to the tank so as to completely eliminate any air space.
(Ord. No. 991-49. Passed 6-27-49, eff. 6-27-49)
(a) Underground tanks outside buildings used for the storage of flammable liquid shall conform to the provisions of this section.
(b) Individual underground tanks for flammable liquid located outside of buildings shall not exceed thirty thousand (30,000) gallon capacity.
(c) The distance from any underground tank outside buildings to a lot line or a building shall be not less than three (3) feet.
(d) No underground tank for liquid with flash point of one hundred degrees Fahrenheit (100°F) or less shall be installed under any street, alley or other public thoroughfare.
(e) The shells of underground storage tanks for Class I or Class II flammable liquid shall be located not less than three (3) feet horizontally from the nearest outside wall of any basement, pit or cellar with floor lower in elevation than the top of such tank, except that a lesser distance may be approved when the tank is enclosed, encased or otherwise protected against injury in an approved manner. Where deemed necessary by the Division of Fire to provide a means of guarding against leakage, tanks for such liquids shall be encircled by a line of open-jointed or perforated drainage tile laid in an approved manner in porous material at a level below the lowest adjoining tank, with inspection wells extending from the drainage tile to the grade level, where directed by the Division. Such inspection wells shall have tight-fitting, easily removable plugs or caps at the grade level.
(f) The distance between underground tanks shall be not less than two (2) feet.
(g) Tanks buried underground outside buildings shall have the top of the tank below the level of any piping to which the tanks may be connected and not less than three (3) feet below the surface of the ground, except that:
(1) In lieu of three (3) feet earth cover, tanks may be buried under twenty-four (24) inches of earth plus a slab of reinforced concrete not less than six (6) inches in thickness extending at least one (1) foot beyond the shell of the tank in all directions.
(2) When tanks are buried under driveways, the total coverage shall be not less than three (3) feet when the uppermost six (6) inches of such coverage is reinforced concrete extending at least one (1) foot beyond the shell of the tanks in all directions, and four (4) feet total coverage in other cases.
(h) Where a tank located outside of buildings cannot be entirely buried, it shall be covered over with earth to a depth of at least three (3) feet. Any sloped surfaces of earth cover shall not be steeper than the angle of repose of the cover material.
(Ord. No. 991-49. Passed 6-27-49, eff. 6-27-49)
(a) Underground tanks shall be bedded in and surrounded by approved noncorrosive backfill, such as clean sand. Clay or cinder backfill shall not be used. Where concrete paving is the finished surface above a tank, such concrete shall be placed upon well tamped backfill. All underground tanks shall be so located and installed as not to endanger any foundation.
(b) No underground storage tank or piping thereto shall be backfilled or covered until it has been inspected and approved by an authorized representative of the Division of Fire. A request for inspection shall be made when the work is ready for inspection and such inspection shall be made within two (2) working days after receipt of such request by the Division.
(c) Where subsurface water conditions exist or are likely to develop, tanks shall be securely anchored or weighted to prevent floating.
(d) Piping to or from underground tanks shall be pitched to drain back to the tanks and all such piping installed outside buildings and carrying flammable liquid shall, unless otherwise specifically approved by the Fire Chief, be installed underground with sufficient cover for protection from damage.
(Ord. No. 991-49. Passed 6-27-49, eff. 6-27-49)
(a) The location of tanks for above-ground storage of flammable liquid shall conform to the following requirements:
(1) Minimum Distance to Common Property Lines. The distance from a tank to a common property line shall be not less than the diameter or height of the tank, whichever is greater, but shall not be less than the following distances. However, when adjoining premises are used for a similar purpose, the Fire Chief may permit storage arranged as permitted when such premises are in one (1) ownership.
Capacity of Tank (Gallons) | Minimum Distance to Common Property Line (Feet) |
Up to 1,100 | 5 |
1,101 to 15,000 | 10 |
15,001 to 30,000 | 20 |
Over 30,000 | 30 |
(2) Minimum Distance to Building on Same Premises. The distance from a tank to a building on the same premises as the tank shall be not less than the diameter or height of the tank, whichever is greater; but shall in no case be less than twenty (20) feet or less than the height of the building, whichever is greater, when the building is used for the processing or manufacturing of flammable liquid or other highly flammable or explosive products; or less than ten (10) feet or one-half (1/2) the height of the building, whichever is greater, in other cases.
(3) Minimum Distance to Street, Alley or Other Public Thoroughfare. The distance from a tank to a street line, alley line or property line abutting a public thoroughfare, shall be such that the tank shall be distant from all premises on the opposite sides of such streets, alleys or public thoroughfares a distance equal to the diameter or height of the tank, whichever is greater; provided that no tank shall be less than ten (10) feet from a street line, alley line or property line abutting a public thoroughfare, or less than thirty (30) feet from premises on the opposite side of such street, alley or public thoroughfare.
(4) Minimum Distance to Railroad.
A. The distance from a tank to a railroad main track over which passenger trains or cars or through freight trains operate shall not be less than the distance to a common property line specified in subsection (a)(1) hereof.
B. The distance from a tank to the right-of-way of a railroad shall be not less than one-half (1/2) the diameter or height of the tank, whichever is greater, but shall be not less than ten (10) feet.
(5) Maximum Number of Tanks in One (1) Group or Battery. Not more than six (6) tanks shall be included in one (1) group or battery.
(6) Minimum Distance Between Tanks.
A. The grouping of tanks shall be such that each tank shall be accessible on at least one (1) side or end for fire fighting. The minimum clear ground level distance deemed to provide such accessibility shall be twenty (20) feet.
B. The minimum clear distance between separate groups or batteries of tanks shall be not less than twice the diameter or height, whichever is greater, of the largest tank abutting on such clear distance; except that when such required distance exceeds forty (40) feet the minimum clear distance shall not be required to be more than one and one-half (1-1/2) times the diameter or height, whichever is greater, of the largest tank abutting on such clear distance.
C. The minimum distance between adjacent tanks in the same group or battery with capacities not exceeding thirty thousand (30,000) gallon each shall be three (3) feet.
D. Except as permitted in subsection (a)(6)C. hereof, the minimum distance between adjacent tanks in the same group or battery of capacities up to five hundred thousand (500,000) gallons shall be one-half (1/2) the diameter or height of the larger tank, whichever is greater; and three-fourths (3/4) the diameter or height of the larger tank, whichever is greater, for tanks exceeding five hundred thousand (500,000) gallon capacity.
(7) Liquids Subject to Boil-Over. Tanks used for the storage of crude petroleum or other flammable liquid subject to boil-over, other than gathering tanks in oil fields, shall be located at distances twice those specified in subsections (a)(1) to (4) and (6) hereof, provided that such distance shall in no case be less than fifty (50) feet. Gathering tanks in oil fields shall be located, constructed, arranged and equipped in conformity with the rules therefor of the Board of Building Standards and Building Appeals.
(b) All above-ground tanks shall be set upon firm foundations and shall be effectively grounded. Telephone poles or other projections liable to act as lightning discharge points shall be kept as far as practicable from tanks. Steel reinforcing of reinforced concrete tanks shall be interconnected and grounded.
(c) Supports for outside above-ground tanks shall be of concrete, masonry or protected steel having a fire resistance rating of not less than three (3) hours. Material used for support or for fire protection shall be either weather resistant or shall be protected against damage by frost or weather action.
(Ord. No. 991-49. Passed 6-27-49, eff. 6-27-49)
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