A material storage unit including a bin having a bottom end, a top end, and a sidewall extending therebetween and defining an interior configured to hold particulates, where a portion of the sidewall defines an angular air flow vent having a top air inlet and a bottom air inlet. The material storage unit further includes a fill line inlet extending through one or both of the bottom end of the bin or the sidewall of the bin and in fluid communication with the interior, a venting outlet extending through one or both of the top end of the bin or the sidewall of the bin and in fluid communication with the interior, and a discharge outlet extending through the bottom end of the bin and in fluid communication with the interior.

A container is constructed to carry granular material from a quarry or source to the frac site. An open frame the size of a standard cargo container is constructed. An enclosed hopper is formed using flat sheet metal with bolted together perpendicular edges. The hopper is set within, and attached to, the frame. Top hatches provide for loading the hopper, and a lower sliding gate in a bottom opening provides for unloading the hopper. The bottom of the hopper is at an angle slightly above the angle of repose of the granular material carried therein.

A container is constructed to carry granular material from a quarry or source to the frac site. An open frame the size of a standard cargo container is constructed. An enclosed hopper is formed using flat sheet metal with bolted together perpendicular edges. The hopper is set within, and attached to, the frame. Top hatches provide for loading the hopper, and a lower sliding gate in a bottom opening provides for unloading the hopper. The bottom of the hopper is at an angle slightly above the angle of repose of the granular material carried therein.

A vertical hydraulic tank includes an upper cylindrical section and a lower conical section, with an outlet in the lower conical section. A lower multi-path manifold is attached to the outlet, the manifold including a vertical conduit in fluid communication with the outlet and a plurality of horizontal conduits in fluid communication with the vertical conduit. An upper multi-path manifold can also be attached to the tank with a plurality of upper horizontal conduits and a vertical conduit in fluid communication with the upper cylindrical section of the tank. Valves may be provided along the vertical conduit and the horizontal conduits to regulate flow of material through the conduits. A pump may be connected to either the upper manifold or the lower manifold, or both by way of a pump conduit. Multiple tanks can be connected together by way of tubing between the manifolds of each tank.

A vertical hydraulic tank includes an upper cylindrical section and a lower conical section, with an outlet in the lower conical section. A lower multi-path manifold is attached to the outlet, the manifold including a vertical conduit in fluid communication with the outlet and a plurality of horizontal conduits in fluid communication with the vertical conduit. An upper multi-path manifold can also be attached to the tank with a plurality of upper horizontal conduits and a vertical conduit in fluid communication with the upper cylindrical section of the tank. Valves may be provided along the vertical conduit and the horizontal conduits to regulate flow of material through the conduits. A pump may be connected to either the upper manifold or the lower manifold, or both by way of a pump conduit. Multiple tanks can be connected together by way of tubing between the manifolds of each tank.

Aspects of the present disclosure provide techniques and apparatus for multiple physical resource block (PRB) operations for narrowband (NB) systems, such as NB internet-of-things (IoT). In one aspect, a method is provided which may be performed by a wireless device such as a user equipment (UE), which may be an NB-IoT device. The method generally includes performing a cell search based on one or more signals received in an anchor RB within a set of RBs available for narrowband communications with a base station (BS); determining a location of at least one additional RB available for the narrowband communications with the BS based on an indication received in the anchor RB; and performing narrowband communications with the BS using at least one of: the anchor RB or the at least one additional resource block.

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 stackable container system configured to carry material includes at least one container having a first end and a second end, a holding area for the material, the holding area extending from the first end to the second end, a first opening at the second end, the material controllably releasable from the holding area through the first opening, and a chute that passes through the holding area, the chute extending from the first end to the second end, a first end of the chute including a receiving portion having a larger area than a combined area of the first opening and a second end of the chute.

A stackable container system configured to carry material includes at least one container having a first end and a second end, a holding area for the material, the holding area extending from the first end to the second end, a first opening at the second end, the material controllably releasable from the holding area through the first opening, and a chute that passes through the holding area, the chute extending from the first end to the second end, a first end of the chute including a receiving portion having a larger area than a combined area of the first opening and a second end of the chute.

A seed storage and dispensing bin includes a walled container having a top, a bottom opposite the top, an interior space defined between the top and the bottom and a divider dividing the interior space into first and second separate spaces each sized to receive a plurality of seeds therein. First and second openings are defined in the walled container at or near the bottom thereof, with each opening to a respective one of the first and second spaces. First and second doors are mounted to the container over the first and second openings respectively. Means are provided for moving the first door between open and closed positions thereof, and for moving the second door between open and closed positions thereof. In some embodiments, the same or different cross-sectional areas of the first and second openings may be exposed through selective movement of the first and second doors respectively.