Electric heating – Metal heating – Nonatmospheric environment at hot spot
Reissue Patent
2000-01-24
2001-04-24
Shaw, Clifford C. (Department: 1725)
Electric heating
Metal heating
Nonatmospheric environment at hot spot
C219S126000, C219S13700R, C220S612000
Reissue Patent
active
RE037144
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an above-ground fire-resistant tank system for flammable and combustible material. More specifically, the invention relates to a tank, fabricated from a specific metal of a minimum thickness which is welded in a specific manner, which can withstand 2000° F. environment for a minimum of two hours.
2. Description of the Related Technology
Numerous applications exist for above-ground tanks for flammable and combustible materials, i.e. gas stations, airports, and construction sites. In all these applications, and more, tanks storing flammable and combustible materials have a potential for fire and explosion, which should obviously be minimized. It has been determined that the risk is sufficiently minimized when a tank can withstand a 2000° F. environment for two hours, as per Underwriters Laboratories test procedure 2085.
A number of different designs of above-ground fire-resistant tanks have been developed which meet the Underwriters Laboratories test procedures. One type of tank is encased in a thickness of cement, which increases the cost of a tank. Besides the economic penalty of adding another component to the tank, the cement is a minimum six inches thick which decreases its maneuverability. Another design requires constructing a storage tank, surrounding the storage tank with insulation, and constructing a secondary containment tank around the insulation. The insulation adds material cost to the tanks and increases the construction labor costs.
It is clear that there has existed a long and unfilled need in the prior art for an above-ground fire-resistant tank for flammable and combustible liquids which does not require additional components in order to withstand 2000° F. for two hours.
SUMMARY OF THE INVENTION
Accordingly, is it an object of the invention to provide a fire-resistant above-ground tank system for storing flammable and combustible material, such as gasoline, by fabricating a tank from steel plates of at least 10 gauge, the steel having a maximum of approximately 0.15% carbon and a maximum of approximately 0.8% manganese. The plates being welded together either with joggle joints or butt weld joints. Further, at least one of the welds contains weld metal having a maximum of approximately 0.15% carbon and a maximum of approximately 1.4% manganese. The tank system contains tank fittings to transfer material into and out of the tank.
It is a further object to provide a double-wall fire-resistant above-ground tank system for storing flammable and combustible material, such as gasoline, by fabricating a product storage tank from steel plates of at least 7 gauge and nesting the storage tank within a secondary containment tank fabricated from steel plates of at least 10 gauge. Both tanks being made out of steel plates having a maximum of approximately 0.15% carbon and a maximum of approximately 0.8% manganese. The plates being welded together either with joggle joints or butt weld joints. Further, at least one of the welds contains weld metal having a maximum of approximately 0.15% carbon and approximately 1.4% manganese.
It is another object to provide a method to fabricate a fire-resistant above-ground tank system for storing flammable and combustible material, such as gasoline, by fabricating a product storage tank of at 10 gauge steel plates. The steel having a maximum of approximately 0.15% carbon and a maximum of approximately 0.8% manganese. The plates being welded together either with joggle joints or butt weld joints. The welds are made either using a submerged arc welder at 225 to 280 amps with L 61 wire and 761 flux or a hot gas metal arc welder with the gas shield being carbon dioxide, the wire feed being an AWS E71T-1 class, titania type flux cored wire designed for use with 100% carbon dioxide gas shielding, the wire having a maximum of approximately 0.15% carbon and a maximum of approximately 1.4% manganese, and the amperage used during welding is 180 to 220 amps. The tank system contains tank fittings to transfer material into and out of the tank.
It is another object to provide a method to fabricate a fire-resistant above-ground tank system for storing flammable and combustible material, such as gasoline, by fabricating a double wall tank with an inner product storage tank made from steel plates of at least 7 gauge and an outer secondary containment tank made from steel plates of at least 10 gauge. The steel for both tanks having a maximum of approximately 0.15% carbon and a maximum of approximately 0.8% manganese. The plates being welded together either with joggle joints or butt weld joints. The welds are made either using a submerged arc welder at 225 to 280 amps with L 61 wire and 761 flux or a hot gas metal arc welder with the gas shield being carbon dioxide, the wire feed being an AWS E71T-1 class, titania type flux cored wire designed for use with 100% carbon dioxide gas shielding, the wire having a maximum of approximately 0.15% carbon and a maximum of approximately 1.4% manganese, and the amperage used during welding is 180 to 220 amps. The tank system contains tank fittings to transfer material into and out of the tank.
In order to achieve the above and other objects of the invention, an above-ground fire-resistant storage tank system for storing combustible material, such as gasoline, is fabricated from steel plates of a minimum thickness, the sheets being made from a special metal alloy, and the plates welded in a specific way, in order to withstand a 2000° F. environment for a minimum of two hours.
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patent: 5305926 (1994-04-01), Webb
Griffing, Len, ed., Welding Handbook, Sixth Edition, Section Four, Metals and their Weldabiltiy, 1972, pp. 63.1-63.5.*
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“Automotive and Marine Service Station Code”, p. 30A-8, section 2-4.5.*
“Insulated Aboveground Tanks for Flammable Liquids”, UL2085, Dec. 27, 1994.*
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“Introducing a New Concept for on Site Storage and Dispensing of Fuel. Double Skin Cylindrical Tank Installations with the Maximum Advantages.” E.W. Taylor Fuel Control Ltd., Harlow, Essex, Jan. 1988.
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“Gasboy 390”.
Knoble & Yoshida LLC
Shaw Clifford C.
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