A multifunction tank access device is configured for connection to a storage tank capable of storing crude oil that has an opening for a conventional thief hatch. The multifunction tank access device has a lower assembly with an isolation valve, and an upper assembly removably connected to the lower assembly. The upper assembly includes a central housing, a pressure relief module, a vacuum relief module, and a tank access module. In some embodiments, at least a portion of the multifunction tank access device is constructed from a material that melts at a temperature below 450° F.

A multifunction tank access device is configured for connection to a storage tank capable of storing crude oil that has an opening for a conventional thief hatch. The multifunction tank access device has a lower assembly with an isolation valve, and an upper assembly removably connected to the lower assembly. The upper assembly includes a central housing, a pressure relief module, a vacuum relief module, and a tank access module. In some embodiments, at least a portion of the multifunction tank access device is constructed from a material that melts at a temperature below 450° F.

A bladder for retaining material to be stored within a bladder tank. The bladder comprises a flexible enclosure comprising a floor portion connected to one or more wall portions, and a leak retention enclosure having upper and lower edges sealed to the flexible enclosure to create a sealed chamber between the flexible enclosure and the leak retention enclosure. Leakage of material from within the flexible enclosure adjacent to the sealed chamber is received within the sealed chamber and retained by the leak retention enclosure.

A bladder for retaining material to be stored within a bladder tank. The bladder comprises a flexible enclosure comprising a floor portion connected to one or more wall portions, and a leak retention enclosure having upper and lower edges sealed to the flexible enclosure to create a sealed chamber between the flexible enclosure and the leak retention enclosure. Leakage of material from within the flexible enclosure adjacent to the sealed chamber is received within the sealed chamber and retained by the leak retention enclosure.

A safety door latch system is presented for a grain bin having a door frame. An inner door is connected to the door frame that is configured to move between an open position and a closed position. An outer door is connected to the door frame and is configured to move between an open position and a closed position. A safety mechanism is connected to the door frame and is configured to move between an open position and a closed position. When the inner door frame is moved to a closed position, a portion of the inner door engages the safety mechanism thereby causing the safety mechanism to move to the closed position. When the safety mechanism is in the closed position, the outer door may be latched to the safety mechanism. When the safety mechanism is in the open position, the outer door cannot latch to the safety mechanism.

A safety door latch system is presented for a grain bin having a door frame. An inner door is connected to the door frame that is configured to move between an open position and a closed position. An outer door is connected to the door frame and is configured to move between an open position and a closed position. A safety mechanism is connected to the door frame and is configured to move between an open position and a closed position. When the inner door frame is moved to a closed position, a portion of the inner door engages the safety mechanism thereby causing the safety mechanism to move to the closed position. When the safety mechanism is in the closed position, the outer door may be latched to the safety mechanism. When the safety mechanism is in the open position, the outer door cannot latch to the safety mechanism.

A system of connecting a stiffener to the sidewall of a grain bin using a stud bolt having a first threaded end, a second threaded end and a feature positioned between the first end and a second end. A sealing member is positioned over the first end of the stud bolt, which in one case is a metallic washer with an affixed compressible sealing member. The first end of the stud bolt is inserted into a hole in the sidewall and an inner nut is placed over the first end inside the sidewall. As the inner nut is tightened, the feature is pulled toward the exterior surface of the grain bin thereby causing the sealing member to form a seal with the exterior surface of the grain bin. The second end of the stud bolt is inserted into a hole in the stiffener which is tightened onto the stud bolt.

A system of connecting a stiffener to the sidewall of a grain bin using a stud bolt having a first threaded end, a second threaded end and a feature positioned between the first end and a second end. A sealing member is positioned over the first end of the stud bolt, which in one case is a metallic washer with an affixed compressible sealing member. The first end of the stud bolt is inserted into a hole in the sidewall and an inner nut is placed over the first end inside the sidewall. As the inner nut is tightened, the feature is pulled toward the exterior surface of the grain bin thereby causing the sealing member to form a seal with the exterior surface of the grain bin. The second end of the stud bolt is inserted into a hole in the stiffener which is tightened onto the stud bolt.

A modular storage tank has a secondary containment receptacle defined by a plurality of rigid floor panels which are joined to one another to form a continuous floor and a plurality of rigid, upright wall panels joined to one another to form a continuous perimeter wall extending upwardly from the continuous floor, and a primary containment receptacle defined by a flexible line membrane within the secondary containment receptacle. The wall panels are joined to one another using a gasket and threaded fasteners such that the wall panels are readily separable from one another for reuse at different site after disassembly. The floor panels are joined to one another and to the perimeter wall by welded seams.

A modular storage tank has a secondary containment receptacle defined by a plurality of rigid floor panels which are joined to one another to form a continuous floor and a plurality of rigid, upright wall panels joined to one another to form a continuous perimeter wall extending upwardly from the continuous floor, and a primary containment receptacle defined by a flexible line membrane within the secondary containment receptacle. The wall panels are joined to one another using a gasket and threaded fasteners such that the wall panels are readily separable from one another for reuse at different site after disassembly. The floor panels are joined to one another and to the perimeter wall by welded seams.