A system comprises a non-transitory machine readable storage medium storing instructions and a database identifying a plurality of assets and a state of each asset. The instructions configure a processor for receiving updates to a distributed electronic ledger managed by plural peer processors. Each update includes an event or change affecting one of the assets. The peer processors verify portions of the ledger describing each event or change. At least one of the updates has not yet been recorded in the ledger at a time of the receiving. The processor computes a state of each asset, based on the updates, receives a request for a state of one of the assets; and responds to the request, reflecting each event and change affecting that asset. The response is performed without waiting for the peer processors to verify an update that has not yet been recorded in the ledger.

A system comprises a non-transitory machine readable storage medium storing instructions and a database identifying a plurality of assets and a state of each asset. The instructions configure a processor for receiving updates to a distributed electronic ledger managed by plural peer processors. Each update includes an event or change affecting one of the assets. The peer processors verify portions of the ledger describing each event or change. At least one of the updates has not yet been recorded in the ledger at a time of the receiving. The processor computes a state of each asset, based on the updates, receives a request for a state of one of the assets; and responds to the request, reflecting each event and change affecting that asset. The response is performed without waiting for the peer processors to verify an update that has not yet been recorded in the ledger.

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.

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.

According an embodiment, a liquid storage system comprises a tank for storing liquid fuel, a vent pipe for providing communication between outside of the tank and a gas space above a level of liquid fuel in the tank, a nonflammable gas supplying apparatus for supplying the gas space with nonflammable gases, a pressure control apparatus installed in the vent pipe to operate responsively to the pressure difference between the gas space and atmospheric pressure so as to limit a pressure in the gas space to a predetermined range. The pressure control apparatus introduces ambient air outside the tank into the gas space through the vent pipe when a pressure in the gas space is lower than a predetermined lower limit, and discharge a gas from the gas space out of the tank through the vent pipe when a pressure in the gas space is higher than a predetermined upper limit.

According an embodiment, a liquid storage system comprises a tank for storing liquid fuel, a vent pipe for providing communication between outside of the tank and a gas space above a level of liquid fuel in the tank, a nonflammable gas supplying apparatus for supplying the gas space with nonflammable gases, a pressure control apparatus installed in the vent pipe to operate responsively to the pressure difference between the gas space and atmospheric pressure so as to limit a pressure in the gas space to a predetermined range. The pressure control apparatus introduces ambient air outside the tank into the gas space through the vent pipe when a pressure in the gas space is lower than a predetermined lower limit, and discharge a gas from the gas space out of the tank through the vent pipe when a pressure in the gas space is higher than a predetermined upper limit.

Devices are provided for ventilating and/or removing volatile chemicals from liquid (e.g. water) stored in a liquid-containing storage tank (e.g. water-storage tank). The devices include a first fluid flow path that is physically isolated from a second fluid flow path and a convection device for moving a first fluid along the first fluid flow path toward at a desired destination and for exhausting the first fluid at the desired destination at a desired velocity. Methods are also provided for ventilating and/or removing volatile chemicals from liquid (e.g. water) stored in liquid-containing storage tanks (e.g. water-storage tanks). The methods involve blowing a first fluid through a ventilation device into a liquid-containing storage device at a velocity sufficient to achieve a desired mass transfer rate of volatile chemicals from the liquid in the liquid-containing storage device to air in the headspace and flowing the contaminated air back through the ventilation device.

Devices are provided for ventilating and/or removing volatile chemicals from liquid (e.g. water) stored in a liquid-containing storage tank (e.g. water-storage tank). The devices include a first fluid flow path that is physically isolated from a second fluid flow path and a convection device for moving a first fluid along the first fluid flow path toward at a desired destination and for exhausting the first fluid at the desired destination at a desired velocity. Methods are also provided for ventilating and/or removing volatile chemicals from liquid (e.g. water) stored in liquid-containing storage tanks (e.g. water-storage tanks). The methods involve blowing a first fluid through a ventilation device into a liquid-containing storage device at a velocity sufficient to achieve a desired mass transfer rate of volatile chemicals from the liquid in the liquid-containing storage device to air in the headspace and flowing the contaminated air back through the ventilation device.

A system comprises a non-transitory machine readable storage medium storing instructions and a database identifying a plurality of assets and a state of each asset. The instructions configure a processor for receiving updates to a distributed electronic ledger managed by plural peer processors. Each update includes an event or change affecting one of the assets. The peer processors verify portions of the ledger describing each event or change. At least one of the updates has not yet been recorded in the ledger at a time of the receiving. The processor computes a state of each asset, based on the updates, receives a request for a state of one of the assets; and responds to the request, reflecting each event and change affecting that asset. The response is performed without waiting for the peer processors to verify an update that has not yet been recorded in the ledger.

Monitoring systems and methods for a relief valve system. In one example, a monitoring system for a relief valve includes at least one tilt sensor coupled to one or more of a cover or a latch of the relief valve. The at least one tilt sensor is associated with an interface. Upon detection by the at least one tilt sensor that one of the cover is open or the latch is unlocked, a signal is transmitted by the interface indicating one or more of the cover is open or the latch is unlocked.