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(A) Each tank over 100-gallon capacity shall have vent openings, except safety valves, provided with approved non-corrodible flame arresters so attached as to completely cover the openings.
(B) Vent openings shall be in no case less than one-fourth inches in diameter, and where a power pump is used in filling tanks and a tight connection is made to fill pipe, vent shall not be smaller than fill pipe.
(1980 Code, § 27.017) Penalty, see § 98.999
(A) Additional vent openings or safety valves adequate to relieve any excessive pressure due to external heat shall be provided, of a type which shall be self-closing when pressure is relieved.
(B) The total area of vents shall not be less than 24 square inches for tanks of 21,000 gallons capacity or less; and 21,000 gallons capacity.
(1980 Code, § 27.018) Penalty, see § 98.999
(A) Tanks more than one foot above the ground shall have a firm foundation and supports of noncombustible materials, bases of which shall rest below the frost line.
(B) Unprotected steel as a support for tanks shall not be permitted. No combustible materials shall be permitted under or within ten feet of any storage tanks except stairways to and walks on top which shall be incombustible.
(1980 Code, § 27.019) Penalty, see § 98.999
All tanks shall be grounded electrically and effectively to permanent moisture.
(1980 Code, § 27.020) Penalty, see § 98.999
(A) All piping shall be standard full weight wrought iron or steel for working pressures less than 100 pounds; for working pressure in excess of 100 pounds, extra heavy pipe and fittings shall be used.
(B) No pipe less than one-half inch internal diameter will be permitted.
(1980 Code, § 27.021) Penalty, see § 98.999
Piping shall be run as directly as possible and proper allowance be made for expansion and contraction.
(1980 Code, § 27.022) Penalty, see § 98.999
Piping when above ground shall be protected against mechanical injury.
(1980 Code, § 27.023) Penalty, see § 98.999
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