A method for providing a drainage from a space between a lined concrete wall and a lining for protecting the lined concrete wall, wherein the method comprises the steps of arranging one or more draining member(s) each comprising a draining pipe having a blind flange arranged at both ends and having a length including the blind flanges that is substantially equal to the wall thickness in a casting frame so that the blind flanges are resting at the casting frame at the inside of the wall and the outside of the wall, respectively; filling concrete filled into the casting frame to cover the draining member(s) and allowing the concrete is allowed to cure; removing the casting frame from at least one of the sides of the concrete wall and; drilling through the blind flanges to open the draining member(s). A drained concrete wall and a concrete vessel are also described.

A system and method for monitoring liquid tanks that includes a submersible sensor within the tank below liquid surface. The system may also include a secondary sensor to determine ambient conditions, and a controller to determine when changes in liquid level are due to ambient events, or potential breach of system. A calibration rod may be used to monitor displacement of liquid in the tank and calibrate system to determine changes in height of liquid level.

A high-performance seafloor flexible oil storage system, solving the existing problems of high storage cost and difficult maintenance of crude oil in offshore oilfields, comprises, sequentially connected, an oil-water separator, a pressure pump, and an input riser extending downward below the sealevel; and a pipeline and multiple flexible oil storage tanks having the same structure with each communicated therewith through a control valve are arranged below the sealevel. One end of the pipeline is communicated with the input riser through a blocking valve and an input valve, and the other end further sequentially connected with an outlet booster pump, an output valve, and an output riser extending upwards above the sealevel and connected to a tanker through a cooler and an output pump. The flexible oil storage tank has a concrete counterweight connected thereunder for fixing it to a seabed. The system has simple structure, convenient maintenance and good practicability.

A high-performance seafloor flexible oil storage system, solving the existing problems of high storage cost and difficult maintenance of crude oil in offshore oilfields, comprises, sequentially connected, an oil-water separator, a pressure pump, and an input riser extending downward below the sealevel; and a pipeline and multiple flexible oil storage tanks having the same structure with each communicated therewith through a control valve are arranged below the sealevel. One end of the pipeline is communicated with the input riser through a blocking valve and an input valve, and the other end further sequentially connected with an outlet booster pump, an output valve, and an output riser extending upwards above the sealevel and connected to a tanker through a cooler and an output pump. The flexible oil storage tank has a concrete counterweight connected thereunder for fixing it to a seabed. The system has simple structure, convenient maintenance and good practicability.

This disclosure relates generally to a storage tank for storing a fluid, such as water, having a wall defined by a plurality of panels which are retained by opposed side edges between adjacent support members. The support members have a base portion and a support portion and are free-standing on the base portion on an earthen floor allowing the tank to be constructed at sites without concrete foundations such as a concrete pad or ring. The tank also has a liner that lines the interior surfaces of the wall and the floor. The main embodiment of the invention is based on a design where the storage water tank is divided by a rubber membrane from the middle of the tank. This will divide the single tank to act as two separate tanks with the ability to operate independently in terms of storage, water/liquid intake and water/liquid output through an outlet. The concept is to provide each half of the tank as a full tank from input and output separated by a rubber membrane.

Systems, methods and apparatuses for inspecting a tank containing a flammable fluid are provided. The system includes a vehicle having a propeller, a latch mechanism, a pressure switch, and an inspection device. The system includes a control unit in communication with the propeller, the latch mechanism, and the inspection device, and electrically connected to the pressure switch. The control unit powers on responsive to the pressure switch detecting an ambient pressure greater than a minimum threshold. The control unit receives, from the latch mechanism, an indication of a state of the latch mechanism. The control unit determines that the cable used to lower the vehicle into the tank containing the flammable fluid is detached from the vehicle. The control unit commands the propeller to move the vehicle through the flammable fluid. The control unit determines a quality metric of a portion of the tank.

Systems, methods and apparatuses for inspecting a tank containing a flammable fluid are provided. The system includes a vehicle having a propeller, a latch mechanism, a pressure switch, and an inspection device. The system includes a control unit in communication with the propeller, the latch mechanism, and the inspection device, and electrically connected to the pressure switch. The control unit powers on responsive to the pressure switch detecting an ambient pressure greater than a minimum threshold. The control unit receives, from the latch mechanism, an indication of a state of the latch mechanism. The control unit determines that the cable used to lower the vehicle into the tank containing the flammable fluid is detached from the vehicle. The control unit commands the propeller to move the vehicle through the flammable fluid. The control unit determines a quality metric of a portion of the tank.

A system and method for monitoring liquid tanks that includes a submersible sensor within the tank below liquid surface. The system may also include a secondary sensor to determine ambient conditions, and a controller to determine when changes in liquid level are due to ambient events, or potential breach of system. A calibration rod may be used to monitor displacement of liquid in the tank and calibrate system to determine changes in height of liquid level.

A method for detecting and preventing leaks of a double-walled container for the storage of poisonous, caustic, irritant and/or combustible media utilizes a double-walled container with an inner wall and an outer wall. A cavity is formed between the inner wall and the outer wall, a positive pressure is generated in the cavity, and in the event of a leak of the inner wall, a gas is fed to the cavity in order to maintain a positive pressure in the cavity. A container system includes an open-loop/closed-loop control device for the open-loop/closed-loop control of a gas throughflow in a line. The system includes a pressure measuring unit for measuring the pressure in the cavity of the double-walled container.

A method for detecting and preventing leaks of a double-walled container for the storage of poisonous, caustic, irritant and/or combustible media utilizes a double-walled container with an inner wall and an outer wall. A cavity is formed between the inner wall and the outer wall, a positive pressure is generated in the cavity, and in the event of a leak of the inner wall, a gas is fed to the cavity in order to maintain a positive pressure in the cavity. A container system includes an open-loop/closed-loop control device for the open-loop/closed-loop control of a gas throughflow in a line. The system includes a pressure measuring unit for measuring the pressure in the cavity of the double-walled container.