A method is disclosed for storing and moving proppant. A supply of fracking proppant is provided at a remote location. A plurality of containers are provided to the desired location, each container having a top, a plurality of walls extending from the top and terminating at an outlet for discharge of proppant therefrom and a flow gate positioned adjacent the outlet to control flow of proppant from an interior volume of the container through the outlet. The plurality of containers are filled with fracking proppant at the remote location, then transported from the remote location to a well site location. The plurality of containers are staged at the well site location and the amount of proppant on hand at the well site location is tracked.

Device (1) for closed systems for equalization of pressure surges, having an outlet nozzle (2), on which an impact plate (3) is provided and a hinged cover (4) is mounted pivotably, wherein the hinged cover (4) lies in a rest position (5) on the outlet nozzle (2) and in an open position (6) bears on the impact plate (3), wherein at least one holding-closed device (7) is provided, which presses the hinged cover (4) in the rest position (5) against the outlet nozzle (2) and in the case of a pressure surge releases the hinged cover (4), wherein the device has a control unit (8) that controls the holding-closed device (7).

Device (1) for closed systems for equalization of pressure surges, having an outlet nozzle (2), on which an impact plate (3) is provided and a hinged cover (4) is mounted pivotably, wherein the hinged cover (4) lies in a rest position (5) on the outlet nozzle (2) and in an open position (6) bears on the impact plate (3), wherein at least one holding-closed device (7) is provided, which presses the hinged cover (4) in the rest position (5) against the outlet nozzle (2) and in the case of a pressure surge releases the hinged cover (4), wherein the device has a control unit (8) that controls the holding-closed device (7).

The invention relates to bung plug (10) having an integrated pressure compensation means for arrangement in a container lid of a liquid container, the bung plug (10) having a valve housing (15) below a plug depression (12), the valve housing (15) being provided with air passage openings (39, 40) and having a receiving pin (16) arranged centrically in the valve housing (15) for arranging a valve diaphragm (17) whose diaphragm hub (18) is arranged on the receiving pin (16), a radially outward ring edge (19) of the valve diaphragm (17) being in contact with a ring shoulder (20) of the valve housing (15), the diaphragm hub (18) being arranged between a depression bottom (14) of the plug depression (12) and a lid hub (22) of a surge lid (21) arranged on the receiving pin (16) and provided with air passage openings (39, 40), a surge disk (32) being provided between the surge lid (21) and the valve diaphragm (17), wherein the surge disk (32) and the surge lid (21) are realized as a unit and the surge lid (21) has a mounting disk (26) arranged at an axial distance from the surge disk (32) for mounting in the valve housing (15), said mounting disk (26) having an outer mounting edge for forming an engagement connection with a mounting seat arranged at an inner side (29) of a housing wall (30) of the valve housing (15).

A bulk fluid storage container has a top wall structure and a bottom wall structure held in spaced relation by a side wall structure. An internal baffle assembly is disposed in the fluid storage volume between the side wall structure for reducing fluid sloshing. A fill port formed in the top wall structure has a fill flange for coupling with a source of the fluid. A vent port formed in the top wall structure has a pressure vacuum value. A drain port formed in the side wall structure in a lower region adjacent the gutter region has a drain valve assembly is coupled to the drain port. A frame assembly includes an upper rectangular frame member and a lower rectangular frame member arranged in spaced relation by a plurality of post; wherein the frame assembly surrounds and supports the fluid storage vessel.

This invention relates to a novel kit, transportable apparatus and method for generating in-situ CO2 snow block within the apparatus. An item such as a biological sample can be stored and transported within the same apparatus that is employed for creating the CO2 snow block. The apparatus is capable of preserving the sample during transport. The invention also includes a specially designed CO2 snow charger system including a charger and meshed conduit. The charger system is operated in accordance with the methods of the present invention to create the in-situ CO2 snow block within a container that can be also used for transport.

This invention relates to a novel kit, transportable apparatus and method for generating in-situ CO2 snow block within the apparatus. An item such as a biological sample can be stored and transported within the same apparatus that is employed for creating the CO2 snow block. The apparatus is capable of preserving the sample during transport. The invention also includes a specially designed CO2 snow charger system including a charger and meshed conduit. The charger system is operated in accordance with the methods of the present invention to create the in-situ CO2 snow block within a container that can be also used for transport.

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.

A pressure vacuum vent is disclosed which has a pressure plate having an opening, a diaphragm positioned on the pressure plate, a sealing ring for holding the diaphragm to the pressure plate, a sealing plate positioned on the diaphragm, a retaining ring for retaining the sealing ring, a screw having a cap having a vent opening, and a spring positioned between the cap and the sealing plate