A proppant discharge system includes a container having an outlet formed at a bottom thereof, a gate affixed at the outlet and positioned on the floor of the container so as to be movable between a first position covering the outlet to a second position opening the outlet, a support structure having the container positioned on the top surface thereof. The support structure has at least one actuator affixed thereto. The actuator is positioned so as to move the gate between the first position and the second position. The container has a cage affixed on the floor thereof in a position over the outlet. The gate is positioned within the cage and is movable by the actuator so as to open the gate so as to allow proppant to be discharged therefrom.

A bulk material shipping container including a pallet, a compartment configured to receive, hold, and release loose materials and connected to and supported by the pallet, a material unloading assembly positioned under a bottom portion of the compartment, configured to facilitate the release or unloading of loose materials from the compartment, and connected to and supported by the pallet, and a material loading assembly configured to facilitate the loading of loose materials into the compartment and connected to and partially supported by a top wall assembly of the compartment.

In accordance with presently disclosed embodiments, systems and methods for managing dry bulk material efficiently at a well site or other location are provided. Present embodiments are directed to a rotary clamshell gate actuation system and method, where the gate is separate from the one or more actuators used to open/close the gate. The disclosed system may include a portable bulk material container with a clamshell gate for easily dispensing material from the container. The system also includes a support structure equipped with one or more rotary actuators used to actuate the clamshell gate of the container between a closed and open position when the container is positioned on the support structure. The disclosed clamshell gate actuation system is easy to operate, low cost to manufacture, and reliable even when the portable container is not precisely aligned on the support structure.

Various embodiments provide a bulk material shipping container top wall assembly, and a bulk material shipping container including the top wall assembly, that provides various advantages over previously known commercially available bulk shipping material container top wall assemblies and bulk shipping material containers.

Various embodiments provide a bulk material shipping container top wall assembly, and a bulk material shipping container including the top wall assembly, that provides various advantages over previously known commercially available bulk shipping material container top wall assemblies and bulk shipping material containers.

A reusable proppant pod provides a containerized system for transport of oilfield proppant to a well location, and facilitates rapid discharge of the proppant in support of hydraulic fracturing operation. The proppant pod has a cylindrical sidewall, a top, and a frustoconical bottom that tapers towards a discharge gate. An external frame may be provided in rectilinear form to stabilize the proppant pod for road transport and to facilitate storage-stacking of a plurality of such proppant pods, one atop the other. The proppant pod is provided with fork lift tubes extending through the cylindrical sidewall. The proppant pod may have a solid top, in which case the proppant pod is inverted for filling operations that introduce proppant into the proppant pod through the discharge gate. A vent assembly is provided to facilitate entry of air during proppant discharge operations, where the vent assembly provides also a seal against proppant leakage during the inverted fill operation.

Subassembly fora double-door leaktight connection system between two closed spaces, the system including two flanges able to be secured to each other, and two doors each normally closing an opening delimited by a flange, the subassembly including a flange and a seal, the seal being intended to provide leaktight contact between the flange and the seal, between the seal and the other flange of the connection system and between the seal and the door closing the opening of the flange, the flange including a groove and the seal being a part moulded onto the flange and being partly received in the groove.

A vacuum system for use in excavation operations. The system uses a tank having an open end that is closed by a door. The door is opened and closed by a door lifting assembly made up of an upper linkage arm, a lower linkage arm and a hydraulic cylinder. A socket is formed in the upper linkage arm, and a shaft housing is formed in the lower linkage arm. The shaft housing engages with the socket to latch the door closed. The upper linkage arm is attached to the door at a first pivot axis and is attached to the lower linkage arm at a second pivot axis. The lower linkage arm is attached to a side of the tank at a third pivot axis. When the door is open, the second pivot axis extends below a reference plane that contains the first and third pivot axis.

A discharge valve for discharging a food product may be arranged at a low point of a vessel. The discharge valve includes a valve body, a valve seat, a valve plug and an arm. The valve plug is attached to a first end of the arm and a second end of the arm is attached to a pivot point that is arranged inside the valve body. The arm is configured to pivot the valve plug between a valve closed position where the valve plug abuts the valve seat, and a valve open position where the valve plug is pivoted away from the valve seat, to a location where the valve plug is positioned at least partly within the valve body.

An example of an apparatus is provided. The apparatus includes a first track to mount on a container along a first side of the container opening. The apparatus further includes a second track to mount on the container along a second side of the container opening. The first side is opposite the second side. In addition, the apparatus includes a frame engaged with the first track and the second track. The frame is to move along the first track and the second track between an open position and a closed position. The apparatus also includes a first panel to mounted on the frame to cover a first portion of the container opening. The apparatus further includes a second panel to mounted on the frame to cover a second portion of the container opening. The first panel is to overlap the second panel by a distance.