A system for controlling an environment within a fuel tank is provided. The system includes a conduit with a plurality of vents, wherein the conduit defines a path through the fuel tank, and wherein the conduit is configured to direct a flow of air along the path and out the plurality of vents.

A vent is described, more specifically a vent for the egress of fluid. The vent comprises a housing comprising an opening and at least one valve that extends through the housing. Additionally, the vent includes a plurality of baffles within the housing, where each baffle in the plurality of baffles comprises at least one aperture, and wherein the aperture or apertures of a first baffle within the plurality of baffles are offset from the aperture or apertures of a second baffle within the plurality of baffles. In this way, the egress of various fluids though the housing may be controlled.

A vent is described, more specifically a vent for the egress of fluid. The vent comprises a housing comprising an opening and at least one valve that extends through the housing. Additionally, the vent includes a plurality of baffles within the housing, where each baffle in the plurality of baffles comprises at least one aperture, and wherein the aperture or apertures of a first baffle within the plurality of baffles are offset from the aperture or apertures of a second baffle within the plurality of baffles. In this way, the egress of various fluids though the housing may be controlled.

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.

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.

Methods, systems, and apparatus for the safe storage of atmospheric air inside a vessel that stores volatile liquid and vapors. The apparatus includes a storage tank defining a tank cavity for storing the volatile liquid and vapors. The apparatus includes a tube having a top opening positioned outside the tank cavity and a bottom opening positioned within the tank cavity. The apparatus includes a bag flange connected to the tube bottom opening and located within the tank cavity. The apparatus includes a bag connected to the bag flange and located within the tank cavity, the bag receiving or emitting atmospheric air via the tube when the volatile liquid and vapors stored within the storage tank contract or expand due to variations in temperature of the stored volatile liquid and vapors, and a weight and a location of the bag within the tank cavity being supported by the bag flange.

Methods, systems, and apparatus for the safe storage of atmospheric air inside a vessel that stores volatile liquid and vapors. The apparatus includes a storage tank defining a tank cavity for storing the volatile liquid and vapors. The apparatus includes a tube having a top opening positioned outside the tank cavity and a bottom opening positioned within the tank cavity. The apparatus includes a bag flange connected to the tube bottom opening and located within the tank cavity. The apparatus includes a bag connected to the bag flange and located within the tank cavity, the bag receiving or emitting atmospheric air via the tube when the volatile liquid and vapors stored within the storage tank contract or expand due to variations in temperature of the stored volatile liquid and vapors, and a weight and a location of the bag within the tank cavity being supported by the bag flange.

A method of delivering proppant to a well site has the steps of transporting a load of proppant in a vessel to a desired location, moving the load of proppant from the vessel into a container so as to create a proppant-loaded container, unloading the proppant-loaded container into a pneumatic bulk trailer, and transporting the unloaded proppant in the pneumatic bulk trailer to well site. The container is placed onto a bed of a truck and moved in proximity to the vessel. The proppant-loaded container is placed onto a tilting mechanism and then tilted so that the proppant is discharged through a flow gate of a container into a hopper. The proppant in the hopper can then be conveyed to the pneumatic bulk trailer.

A liquid tank system comprises a main liquid tank, an outlet communicating between a fluid circuit and the main liquid tank, an inlet communicating between the fluid circuit and the main liquid tank, and an auxiliary cavity. First vent passage and second vent passage(s) communicate between the main liquid tank and the auxiliary cavity and allows liquid and gas to flow from the main liquid tank to the auxiliary cavity. The second vent passage has a flow control device regulating flow through the second vent passage and having a set point at which it allows liquid and gas to flow from the main liquid tank to the auxiliary cavity only when a pressure in the main liquid tank is beyond a threshold. The liquid tank system has an attitude envelope in which the liquid tank system is configured such that, in use, the flow control device blocks flow through the second vent passage when an end of the first vent passage in the main liquid tank is above a liquid level, and the flow control device allows gas and/or fluid flow through the second vent passage when main fluid tank pressure is above the threshold and the end of the first vent passage in the main liquid tank is below the liquid level.

A liquid tank system comprises a main liquid tank, an outlet communicating between a fluid circuit and the main liquid tank, an inlet communicating between the fluid circuit and the main liquid tank, and an auxiliary cavity. First vent passage and second vent passage(s) communicate between the main liquid tank and the auxiliary cavity and allows liquid and gas to flow from the main liquid tank to the auxiliary cavity. The second vent passage has a flow control device regulating flow through the second vent passage and having a set point at which it allows liquid and gas to flow from the main liquid tank to the auxiliary cavity only when a pressure in the main liquid tank is beyond a threshold. The liquid tank system has an attitude envelope in which the liquid tank system is configured such that, in use, the flow control device blocks flow through the second vent passage when an end of the first vent passage in the main liquid tank is above a liquid level, and the flow control device allows gas and/or fluid flow through the second vent passage when main fluid tank pressure is above the threshold and the end of the first vent passage in the main liquid tank is below the liquid level.