A tank and a method of carrying a load and discharging a load therefrom. The tank includes a tank having a first wall that bounds and defines a first compartment for carrying a load therein and a second wall spaced outwardly from at least a portion of the first wall; wherein a second compartment is defined between the first wall and the second wall. The tank assembly includes an air piping system that is selectively actuated to place the first compartment and the second compartment under equal air pressure. In one example the air piping system pumps air into the first compartment and the second compartment. In another example the air piping system evacuates air from the first and second compartments.

A tank and a method of holding a load and discharging a load therefrom. The tank includes a first wall that bounds and defines a first compartment for holding a load therein and a second wall spaced outwardly from at least a portion of the first wall; wherein a second compartment is defined between the first wall and the second wall. The tank assembly includes an air piping system that is selectively actuated to place the first compartment and the second compartment under substantially similar or substantially equal air pressure. In one example the air piping system pumps air into the first compartment and the second compartment. In another example the air piping system evacuates air from the first and second compartments.

An apparatus for reducing a probability of damage to a vehicle from rising water includes a first sheet of a water-resistant material and a second sheet of the water-resistant material. A first side of a connector (e.g., zipper) is interfaced to a first periphery of the first sheet of the water-resistant material and a second side of the connector is interfaced to a second periphery of the second sheet of the water-resistant material. After a vehicle is placed upon the first sheet of the water-resistant material, the second sheet of the water-resistant material is draped over the vehicle and the first side connector is engaged with the second side connector, thereby encapsulating the vehicle within the first sheet and second sheet of the water-resistant material

A barrel is capable of vacuum loading and unloading, gravity unloading and loading, and pneumatic unloading. A roll-off skid is coupled to the barrel.

A material (e.g., proppant) handling system includes a storage container, a mechanical conveyor system, and a pneumatic conveyor system. The mechanical conveyor system is configured to convey material from an unloading station to a conveyor system discharge and into an inlet of the storage container (e.g., at an elevation that is higher than the unloading station). The pneumatic delivery system is configured to deliver material from the storage container to an off-system destination (e.g., a silo or the like), pneumatically. In a typical implementation, the storage container, the mechanical conveyor system, and the pneumatic conveyor system are all on, or connected to, or supported by one common chassis.

Granular material flows out through the discharge opening of a silo and through a sealed housing to a target location. A vent opening in a top portion of the silo has a vent cover operative to selectively open and close the vent opening. When the vent cover is closed, air movement into an upper portion of the silo is prevented. A gate is operative to control a flow of granular material through the discharge opening. A vacuum conduit has a lower input end thereof connected to an interior of the housing, and an upper output end thereof located in an upper portion of an interior of the silo. Material flowing out of the silo creates a vacuum drawing dust from the housing up the vacuum conduit into the silo.

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 tank and a method of carrying a load and discharging a load therefrom. The tank includes a body having a first wall that bounds and defines a first compartment for carrying a load therein and a second wall spaced outwardly from at least a portion of the first wall; wherein a second compartment is defined between the first wall and the second wall. An air piping system is selectively actuated to place the first compartment and the second compartment under substantially similar or substantially equal air pressure. In one example the air piping system pumps air into the first compartment and the second compartment. In another example the air piping system evacuates air from the first and second compartments.

A dry bulk tank and a method of carrying a load and discharging a load therefrom. The dry bulk tank includes a tank assembly having a first wall that bounds and defines a first compartment for carrying a load therein and a second wall spaced outwardly from at least a portion of the first wall; wherein a second compartment is defined between the first wall and the second wall. The tank assembly includes an air piping system that is selectively actuated to place the first compartment and the second compartment under equal air pressure. In one example the air piping system pumps air into the first compartment and the second compartment. In another example the air piping system evacuates air from the first and second compartments.

A dry bulk tank and a method of carrying a load and discharging a load therefrom. The dry bulk tank includes a tank assembly having a first wall that bounds and defines a first compartment for carrying a load therein and a second wall spaced outwardly from at least a portion of the first wall; wherein a second compartment is defined between the first wall and the second wall. The tank assembly includes an air piping system that is selectively actuated to place the first compartment and the second compartment under substantially similar or substantially equal air pressure. In one example the air piping system pumps air into the first compartment and the second compartment. In another example the air piping system evacuates air from the first and second compartments.