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 tank or silo storage system comprising a plurality of curved tessellating panels, the tessellating panels being arranged in use to form a plurality of cylindrical rings, the plurality of cylindrical rings being arranged in use to be adjacent to one another to form an elongate cylindrical tank or silo body, the panels are provided with protuberances and continuity couplings for the protuberances or the tank or silo is provided with a radially alternating stiffening arrangement.

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 storage container for storing quantities of acids and other volatile liquids is described having a recirculation system that can include a recirculation pump and a recirculation line that goes from a bottom end of the container toward a top end of the container, where the recirculation line has a plurality of pressure relief valves spaced along its length. The storage container may also include a leak detection system and a high level warning system.

In an LNG tank, a dike is formed by arranging precast blocks in the circumferential direction and layering the precast blocks in the vertical direction. Each of the precast blocks has loop joints on the top, bottom, left, and right side faces, and concrete is deposited between each two precast blocks adjacent in the circumferential direction and the vertical direction, whereby masonry joints are formed in the vertical direction and the circumferential direction. Prestress is imparted to the dike by PC steel members. The PC steel members are provided in the circumferential direction and the vertical direction of the dike, and are arranged so as to avoid the masonry joints in the circumferential direction and the vertical direction. Therefore, it is possible to construct the dike in a short time, and it is possible to provide a tank or the like that can reduce the construction period.

A granular material storage container and associated method. The storage container includes a foundation, a peripheral wall supported on the foundation, a plurality of vertical stiffeners attached to the peripheral wall, and a horizontal connector connecting the peripheral wall to the foundation. The horizontal connector extends between at least a pair of vertical stiffeners and operates for load transfer from the peripheral wall to the foundation during single pass sweeping.

A mobile proppant delivery system may include a system for unloading proppant transport trailers, storing proppant in silos, and feeding proppant to frac operations. The system may include drive-over conveyors, swiveling distribution heads, internal silo bucket elevators, gravity feed, choke filling, and bases designed with internal conveying systems.

The invention relates to modular elements for building a storage basin, to a network obtained by assembling a plurality of modular elements, to a supporting structure, to a storage basin and to a process for obtaining a storage basin. The modular element according to the invention is provided in the interior with a network element constituted by main half joints (10), secondary half joints (11) and tertiary half joints (10), vertical channels (8,15), oblique channels (9), compartments (18), and is provided with joint elements (16,17). The network comprises horizontal annular channels and main, secondary and tertiary joints connected by vertical and oblique channels. The storage basin comprises a supporting structure at the interior of an insulating structure obtained by assembling the modular elements. The process for obtaining a storage basin comprises the assemblage of the modular elements and casting the hardening material in the network obtained by assembling the modular elements, forming the supporting structure.

A plastic article useful as a riser assembly for a septic tank or as part of another structure is comprised of a multiplicity of identical shape conical wall plastic risers. The risers are attached to each other at joints by tabs which engage rim segments; each end of the riser has alternating tabs and rim segments. A riser assembly wall undulates in the lengthwise direction. The risers nest within each other for shipment or storage.

A method for constructing a triple shell tank including an inner tank, an intermediate tank, and an outer tank each having a roof and a side plate includes the following procedure. As construction entrances, a first construction opening is opened in an outer tank side plate, a second construction opening is opened in an inner tank side plate, and a third construction opening is opened in an intermediate tank side plate, each during the installation of the corresponding side plate. The construction openings are opened so as to partially overlap with one another in a circumferential direction and a height direction of the triple shell tank. The first construction opening and the second construction opening are opened so as to satisfy a relationship AR1AR2, where AR1 is an opening area of the first construction opening and AR2 is an opening area of the second construction opening.