A plurality of hollow filter sheets have a suction pipe inserted therethrough to be stacked with a ring-shaped packing clamped therebetween. Therefore, a gap between the hollow filter sheet and the suction pipe is watertightly sealed. In the hollow filter sheet, a hollow portion is provided between two filters, and then a spacer with a surface having pits and projections is provided in the hollow portion. A narrow passage space allowing liquid to pass through is provided between the filter and the spacer by pressing the two filters against surfaces of the spacer with the packings and causing the filters to be deformed into a shape according to the surfaces of the spacer. The narrow passage space is smaller than a drainage space between the filters and the spacer that are not clamped by the packings.

A plurality of hollow filter sheets have a suction pipe inserted therethrough to be stacked with a ring-shaped packing clamped therebetween. Therefore, a gap between the hollow filter sheet and the suction pipe is watertightly sealed. In the hollow filter sheet, a hollow portion is provided between two filters, and then a spacer with a surface having pits and projections is provided in the hollow portion. A narrow passage space allowing liquid to pass through is provided between the filter and the spacer by pressing the two filters against surfaces of the spacer with the packings and causing the filters to be deformed into a shape according to the surfaces of the spacer. The narrow passage space is smaller than a drainage space between the filters and the spacer that are not clamped by the packings.

The present invention relates to filters used to remove debris from water being sucked into a piping system. It has particular application use in nuclear power plants, which, after a loss of coolant accident, must pump cooling water back into the reactor core from a collection sump. This water may contain various types of debris that must be removed before the water is sent back into the reactor cooling system. There are restrictions on the allowable pressure drop across the strainer and the space available for installing this equipment. The finned strainer of the present invention addresses these issues while maximizing the quantity of debris filtered from the water.

The present invention relates to filters used to remove debris from water being sucked into a piping system. It has particular application use in nuclear power plants, which, after a loss of coolant accident, must pump cooling water back into the reactor core from a collection sump. This water may contain various types of debris that must be removed before the water is sent back into the reactor cooling system. There are restrictions on the allowable pressure drop across the strainer and the space available for installing this equipment. The finned strainer of the present invention addresses these issues while maximizing the quantity of debris filtered from the water.

The present invention relates to filters used to remove debris from water being sucked into a piping system. It has particular application use in nuclear power plants, which, after a loss of coolant accident, must pump cooling water back into the reactor core from a collection sump. This water may contain various types of debris that must be removed before the water is sent back into the reactor cooling system. There are restrictions on the allowable pressure drop across the strainer and the space available for installing this equipment. The finned strainer of the present invention addresses these issues while maximizing the quantity of debris filtered from the water.

Methods and systems are provided for a multiphase separating device comprising a superhydrophobic filter composed of at least one passage from an inlet of the multiphase separating device to a second outlet of the multiphase separating device, with a first outlet approximately midway between the inlet and the second outlet and perpendicular thereto. The superhydrophobic filter is formed of a plurality of superhydrophobic disks which are superhydrophobic on both a first face and a second face such that capillary non-wetting (e.g., gas-wicking) forces are established when the plurality of superhydrophobic disks are stacked in face-sharing contact. In one example, the at least one passage is formed as helical through holes configured to generate centrifugal separating forces.

Methods and systems are provided for a multiphase separating device comprising a superhydrophobic filter composed of at least one passage from an inlet of the multiphase separating device to a second outlet of the multiphase separating device, with a first outlet approximately midway between the inlet and the second outlet and perpendicular thereto. The superhydrophobic filter is formed of a plurality of superhydrophobic disks which are superhydrophobic on both a first face and a second face such that capillary non-wetting (e.g., gas-wicking) forces are established when the plurality of superhydrophobic disks are stacked in face-sharing contact. In one example, the at least one passage is formed as helical through holes configured to generate centrifugal separating forces.

A method and system for treating oilfield produced water is disclosed. The method includes passing oilfield produced water through a chain of filters, first filter configured to filter particles of a size larger than 10 m from the water, a second filter configured to filter remaining particles of a size larger than 2 m from the water and a third filter configured to filter remaining particles of a size larger than 0.5 m from the water and automatically cleaning at least one of the filters.

A desalination method includes the steps of: providing a plurality of reverse osmosis membrane discs at a depth in an ocean selected to provide a hydrostatic pressure; directing seawater through the membrane discs using the hydrostatic pressure; collecting the freshwater directed through the membrane discs; pumping the freshwater to a surface of the ocean; and then transporting the freshwater to land.

A desalination method includes the steps of: providing a plurality of reverse osmosis membrane discs at a depth in an ocean selected to provide a hydrostatic pressure; directing seawater through the membrane discs using the hydrostatic pressure; collecting the freshwater directed through the membrane discs; pumping the freshwater to a surface of the ocean; and then transporting the freshwater to land.