Abstract: A storage tank system especially useful for storing gasoline has an auxiliary enclosure assembly. The system comprises a storage tank, preferably with a tank cover for gaining ingress into the storage tank, a sleeve positioned on the storage tank, a sleeve cover with an entry cover in a mid-portion thereof, preferably a dirt shield extending from the sleeve cover to ground level, a drip sump compartment positioned on the cover of the sleeve and a fill line extending through the drip sump compartment and sleeve. The assembly allows ready access to the area within the sleeve for inspection and repair purposes and can provide ready access to the interior of the tank. It also provides protection and containment for access lines leading through it.

Abstract: A storage tank system especially useful for storing gasoline comprises a storage tank, a sleeve with sleeve cover positioned on the storage tank, a drip sump compartment positioned on the cover of the sleeve and a fill line extending through the drip sump compartment and sleeve. The storage tank as well as structural accessories such as a dispensing line can have an outer containment wall. The system results in a storage facility which is capable of containing minor spills from a filling operation.

Abstract: A storage tank comprises a cylindrical-shaped main body, end caps, a manway and a set of support ribs extending circumferentially around the main body. The manway is integral with a main body of the storage tank and has a side wall which extends generally vertically from the main body with a terminus which forms a substantially horizontal plane and defines an opening. A manway lid is dimensioned to cover the opening and has means to removably secure it to the manway. The cylindrical-shaped main body and manway are formed together using a fibrous reinforcing material and a resinous material so as to be integral with one another.

Abstract: An overfill assembly for controlling overfill of liquid to an underground storage tank during a filling operation comprises a dump tank, a fill tube positioned within the dump tank, piping with a valve, a cover base anchor ring, and a cover. The cover base anchor ring and preferably the fill tube within the dump tank are encased with a shrink-fitting covering which extends from the neck and dump tank bottom wall, respectively to ensure liquid tight fits.

Abstract: A method of making a storage tank comprises forming a cylindrical-shaped inner tank with integral support ribs and forming an outer wall comprised of a series of sections which are at least partially separated from the inner tank's walls between each set of support ribs. Each outer wall section is bonded to side walls of adjacent ribs at a distance of less than about 90% of the height of the support ribs such that the ribs protrude from the outer surface of the storage tank system. The inner and outer walls of the system are both strengthened by the common support ribs. Secondary containment is provided by the outer wall. A monitored storage tank system is provided by the use of a leak detection means to monitor the closed space defined by the rib interiors, the outer wall and the storage tank.

Abstract: A method of making a storage tank comprises forming a cylindrical-shaped tank from thin gauge metal and adding spaced support ribs. In a preferred embodiment, an outer wall comprises of a series of sections which are at least partially separated from the tank's walls between each set of support ribs is provided. Each outer wall section is bonded to side walls of the ribs at a distance of less than about 90% of the height of the support ribs such that the ribs protrude from the outer surface of the storage tank.

Abstract: An underground storage tank system has an internal retained capacity area for receiving excess liquid from a filling operation. The storage tank system comprises a rigid storage tank, fill pipe, vent line, vent extension line, dispensing line, and trapped vapor release valve. The vent extension line extends into the storage tank. The lower end of the vent extension line within the storage tank defines a horizontal plane above which is an internal retained capacity area. The trapped vapor release valve is closed during a filling operation so that eventually a build up or pressure occurs within the retained capacity area to prevent further flow of liquid to the tank. Opening of the trapped vapor release valve relieves the pressure in the retained capacity area thereby allowing excess liquid in the fill pipe and delivery hose to drain into the rigid storage tank.

Abstract: A storage tank system having primary and secondary containment capability is made from a rigid outer tank shell by forming in situ an inner tank of fibrous reinforcing material and resinous material. A separating material is initially positioned on the interior surface of the rigid outer tank. The closed space between the rigid outer tank shell and formed inner tank is monitored for leakage.

Abstract: An assembly intended for use on underground storage tanks provides ready access to a fill pipe from ground level. At the same time the assembly serves as a spill containment means for accidental spillage and a secondary containment means for the fill pipe. The assembly of the invention comprises a secondary containment chamber having a sidewall with means for attaching to the storage tank. An anchor ring which is attached to an upper open end of the containment chamber acts as a permanent ground base for the assembly. A bridging surface cover within the anchor ring has a removable lid positioned in its interior portion to gain access to the chamber's interior for a filling operation. The assembly also comprises a fill pipe for delivering liquid to the storage tank. The fill pipe is positioned within the secondary containment chamber with a discharging end extending through the chamber's bottom and a receiving end terminating within the chamber but near the bridging surface cover.

Abstract: A storage tank with secondary containment with a manway for entry into the interior of the tank has an assembly which is dimensioned to fit within the manway. An annular space between the assembly and manway wall is formed which can be monitored for leakage. When secondary containment is provided by a bladder within a rigid tank, the assembly further comprises a flange at its bottom surface and a ring element dimensioned to mate with the lower flange. Securing means hold the bladder between the lower flange and ring element. Secondary containment of the manway is also provided by the assembly.

Abstract: A double walled storage tank system comprises an outer tank shell, a separating material and an inner tank made of a fibrous reinforced resinous material. The separating material has a series of holes extending therethrough to act as molds to receive resinous material. An inner tank is formed in situ. The tank system has an integral structural strength capable of withstanding external load forces normally encountered by underground storage tanks. Secondary containment with leak detection capability is provided.

Abstract: A storage tank system especially useful for storing liquid gasoline comprises a storage tank, a covered sleeve attached to the storage tank and encompassing a fill line, a drip sump compartment positioned on the cover of the sleeve and a fill line extending through the drip sump compartment and sleeve. The enclosed sleeve area is preferably monitored for leakage. The storage tank as well as structural accessories such as a dispensing line can have an outer containment wall. The system results in a storage facility which is not likely to lose its stored liquid to the environment due to slow leaks or a sudden large leak by providing total containment capability.

Abstract: A storage tank system especially useful for storing liquid gasoline comprises a rigid inner storage tank, access lines extending through the tank, a sleeve encompassing the access lines, a jacket encasing the tank and at least part of the sleeve, and a drip sump compartment positioned on a sleeve cover to the sleeve to catch drippings from a fill operation. A leak detector is associated with the closed space between the inner tank and jacket to detect leaks. The system results in a storage facility which is not likely to lose its stored liquid to the environment due to slow leak or a sudden large leak by providing total containment capability.

Abstract: A method of making a jacketed storage tank comprises applying an open-cell synthetic foam over a rigid inner storage tank, applying a layer of fibrous reinforcing material on the separating agent, and applying a resinous material. The synthetic foam is at least partly sealed to prevent excessive resinous material penetration so as to maintain the continuous open-cell nature of the foam. The resultant jacket is structurally independent from the storage tank, yet is in such close proximity thereto that the resultant jacketed storage tank has an integral structural strength capable of withstanding external load forces normally encountered by underground storage tanks. Secondary containment with leak detection capability is provided.

Abstract: A method of making a storage tank comprises forming a cylindrical-shaped inner tank with integral support ribs and forming an outer wall comprised of a series of sections which are at least partially separated from the inner tank's walls between each set of support ribs. Each outer wall section is bonded to side walls of adjoining ribs at a distance of less than about 90% of the height of the support ribs such that the ribs protrude from the outer surface of the storage tank system. The inner and outer walls of the system are both strengthened by the common support ribs. Secondary containment is provided by the outer wall. A monitored storage tank system is provided by the use of a leak detection means to monitor the closed space defined by the rib interiors, the outer wall and the storage tank.

Abstract: An underground storage tank system has an internal retained capacity area for receiving excess liquid from a filling operation. The storage tank system comprises a rigid storage tank, a coaxial fill line with a fill pipe and an outer concentric vapor recovery tube, a vent line, a dispensing line, and a trapped vapor release valve. A vapor recovery extension tube and vent extension line each extend into the storage tank. The uppermost of the lower end of the vapor recovery extension tube and lower end of the vent extension line within the rigid tank defines a horizontal plane above which is an internal retained capacity area. The trapped vapor release valve is closed during a filling operation so that eventually a build up of pressure occurs within the retained capacity area to prevent further flow of liquid to the tank.

Abstract: A method of making a storage tank system comprises forming a cylindrical-shaped inner tank with integral support ribs and forming a series of interior wall sections which are at least partially separated from the tank's walls between each set of support ribs. Each wall section is preferably bonded to the side walls of adjoining ribs. The walls of the storage tank are strengthened by the support ribs and wall sections.

Abstract: A double walled storage tank system comprises an inner storage tank, a separating material and a jacket formed of a fibrous reinforced resinous material. The separating material has a series of holes extending therethrough to act as molds to receive resinous material. The jacket has an integral structural strength capable of withstanding external load forces normally encountered by underground storage tanks. Secondary containment with leak detection capability is provided.

Abstract: A method of making a storage tank system comprises forming a series of circumferentially extending wall sections on the interior walls of a cylindrical-shaped ribbed storage tank. The storage tank has a contour surface with rib recesses. Each wall section is bonded to the tank's interior walls at a distance of less than about one inch in height from the tank wall and extends laterally across a rib recess.

Abstract: A cylindrical-shaped storage tank with substantially flattened ends is jacketed in a manner which results in storage tank system capable of holding detecting liquid or being placed under nonatmospheric pressure without structural damage. The storage tank initially has end plates mounted on its flattened ends. Thereafter, a separating agent is applied over the side walls of the storage tank, a layer of fibrous reinforcing material applied on the separating agent and the end plates, and a resinous material applied. The resultant jacket is independent from the side walls of the inner tank. True secondary containment is provided by the end plates and jacket. A fail safe containment storage tank system is provided by the use of independent leak detection means to monitor the closed space between the storage tank and end plates and the closed annular space between the storage tank and jacket for tank or jacket leakage.