- Email: [email protected]
Filter element
INVENTIONSINFILTRATIONANDSEP Abstracts of British Patents Crude oil separator
Filter cartridge
In GB 2242373 British Offshore Engineering Technology Ltd describes a crude oil separator. It is located on the seabed, and separates the solids, gas and liquid phases from the product of an underwater oil well, retaining the solids and discharging the gas to a flare on the surface and the liquid to a surface mooring for transfer to a tanker. The separator may discharge oil and water through separate lines, or at different times through one line. The various control valves and discharge pumps are controlled automatically by pressure and level indicators via a common microprocessor, which is also located underwater in a separate sealed enclosure. Separate flowmeters may monitor the flows of the separated fluids, which may thereafter be recombined for passage through a single pipeline. (7jZgures, 2200 words)
In GB 2242840 Gilbarco Inc describes a filter cartridge support. It is used with a liquid fuel dispenser that is provided with a peripheral skirt that extends below the interface between the filter cartridge and its support, to deflect fuel or vapour, which may escape through the interface if the cartridge is inadvertently unscrewed from the support while the fuel pumps are still switched on. (ZJigures, 3000 words)
Rotary screening
device
In GB 2242374 Edward Victor Byers describes a rotary screening device for separating unwanted solid matter such as sewage, weeds, tar globules and fish from water which is to be used for special purposes such as cooling or other plant processes. The device comprises a rotating hollow stack of closely spaced coaxially mounted annular discs, each of which is provided with peripheral teeth on which solid matter may be caught and carried away to a collection zone. Scraper elements engaging an annular tracking surface between the teeth on adjacent discs assist in the process. The tracking surfaces have apertures or slits to permit the passage of cleaned water to the interior of the hollow stack, which may be connected to stationary ducting for conveying the cleaned water. (1 jfgure, 2000 words)
Separating
apparatus
In GB 2244937 Dandem Manufacturing Ltd describes an apparatus for separating water and washed sand. The mixture is fed into a vessel having a channel of semi-circular cross-section, along which water travels to an overflow. A bucket wheel lifts the sand from the vessel to a chute, each bucket having a mesh base for draining water off. A filter disc rotates upstream of the overflow, making a seal with the channel, and is backwashed by water from a radial nozzle tube. An auger rotates with the disc to return sand to the vessel. (Sores, 3700 words) Flltratlon
& Separation
November/December
support
The invention provides a collection chamber for oil storage, a fluid inlet for supplying fluid to the chamber, and a deflector which acts to reduce the kinetic energy of oil entering the chamber. Incoming oil is directed parallel and adjacent to the surface of any oil in the chamber. Reducing the kinetic energy of the incoming oil helps to prevent any air bubbles being further broken up. Directing the incoming oil parallel and adjacent to the surface allows the air bubbles to rise to the surface, rather than be drawn back into the hydraulic circuit. Other chambers help in condensing oil droplets in the air, and a baffle plate cuts down splashing brought about by rough movement. (3 Jigures, 3000 words)
Filter assemblies In GB 2243793 Pall Corporation describes g filter assembly for the nuclear industry. It consists of several tubular filters welded at one end to a plenum chamber made of plastic by rotational moulding and includes an outlet. The other ends of the filters are closed and supported by a plate attached to a plenum chamber by tie rods. A central rod screws into a captive nut at one end, and has a fitting to facilitate remote handling at the other. By forming the plenum chamber by a rotational moulding process, the tooling can be produced much less expensively than that for a die-casting process. Also, the chamber is produced in one piece, which obviates the requirement for a subsequent manufacturing step. The assembly is cheap and disposable. (3 jIgures, 2700 words)
Blood filter In GB 2243794 Pall Corporation describes a blood filter. It comprises a housing divided by a multi-stage filter element and supported on each side by arrays of concentric ridges defining inlet and outlet distribution zones, and extended to open into a distribution zone through a passage at the bottom of the filter. An outlet is similarly extended to open into another zone by a passage at the top of the filter. Any air expelled in front of incoming liquid flows into an outlet ahead of the liquid. One outlet zone is extended by a vertical diametrical groove, whose cross-section widens upwards and conveys liquid from concentric channels defined by the ridges to an outlet passage. (3 Figures, 2400 words)
Degassing
hydraulic
Copolymides
for membranes
In GB 2244997 The British Petroleum Company plc describes a copolymide. It is prepared by dissolving 3,3’,5,5’-tetramethyl-4,4’-diaminodiphenyl-methane in a solvent, adding to the diamine solution a mixture of 1,4-bis- (3,4dicarbonphenoxy) -2,5-di-tertiarybutybenzene dianhydride and 3,3’,4,4’-bensophenonetetracarboxylic dianhydride in a weight percent ratio from 2O:l to 1:1, and allowing the reactant to polymerise. Membranes, suitable for gas separation and micro- and ultrafiltration applications, may be prepared by dissolving the copolyimide in a solvent, spreading the resultant solution onto a substrate, allowing the solvent to evaporate and subsequently removing the membrane from the substrate. The membrane may be crosslinked with UV radiation. (10 jTgures,
1500 wo?-ds) British
fluid
In GB 2244661 Massey-Ferguson Manufacturing Ltd describes an air removal system especially for use in removing air from the oil of a hydraulic system.
1992
Filter element In GB 2244938 Pall Corporation describes a tubular filter element. It consists of a filter medium enclosed by end caps and an external helically wound ribbon, the turns of which overlap and are bonded to each other and to a medium by *helical lines of adhesion; these may be adhesive strips or involve fusion. The ribbon supports the medium against outward flow filtering or backwashing, withstanding a pressure drop of 75 psi while contributing no more than 10% of the pressure drop across itself. The medium may comprise entangled but unbound fibres and/or ion exchange resin or active carbon. (4 figures, 6000 words)
Patent Spe@ications
can be ordered
Unit 6 Nine Mite Point Industrial
Estate
;
541
Filter cartridge
In GB 2242373 British Offshore Engineering Technology Ltd describes a crude oil separator. It is located on the seabed, and separates the solids, gas and liquid phases from the product of an underwater oil well, retaining the solids and discharging the gas to a flare on the surface and the liquid to a surface mooring for transfer to a tanker. The separator may discharge oil and water through separate lines, or at different times through one line. The various control valves and discharge pumps are controlled automatically by pressure and level indicators via a common microprocessor, which is also located underwater in a separate sealed enclosure. Separate flowmeters may monitor the flows of the separated fluids, which may thereafter be recombined for passage through a single pipeline. (7jZgures, 2200 words)
In GB 2242840 Gilbarco Inc describes a filter cartridge support. It is used with a liquid fuel dispenser that is provided with a peripheral skirt that extends below the interface between the filter cartridge and its support, to deflect fuel or vapour, which may escape through the interface if the cartridge is inadvertently unscrewed from the support while the fuel pumps are still switched on. (ZJigures, 3000 words)
Rotary screening
device
In GB 2242374 Edward Victor Byers describes a rotary screening device for separating unwanted solid matter such as sewage, weeds, tar globules and fish from water which is to be used for special purposes such as cooling or other plant processes. The device comprises a rotating hollow stack of closely spaced coaxially mounted annular discs, each of which is provided with peripheral teeth on which solid matter may be caught and carried away to a collection zone. Scraper elements engaging an annular tracking surface between the teeth on adjacent discs assist in the process. The tracking surfaces have apertures or slits to permit the passage of cleaned water to the interior of the hollow stack, which may be connected to stationary ducting for conveying the cleaned water. (1 jfgure, 2000 words)
Separating
apparatus
In GB 2244937 Dandem Manufacturing Ltd describes an apparatus for separating water and washed sand. The mixture is fed into a vessel having a channel of semi-circular cross-section, along which water travels to an overflow. A bucket wheel lifts the sand from the vessel to a chute, each bucket having a mesh base for draining water off. A filter disc rotates upstream of the overflow, making a seal with the channel, and is backwashed by water from a radial nozzle tube. An auger rotates with the disc to return sand to the vessel. (Sores, 3700 words) Flltratlon
& Separation
November/December
support
The invention provides a collection chamber for oil storage, a fluid inlet for supplying fluid to the chamber, and a deflector which acts to reduce the kinetic energy of oil entering the chamber. Incoming oil is directed parallel and adjacent to the surface of any oil in the chamber. Reducing the kinetic energy of the incoming oil helps to prevent any air bubbles being further broken up. Directing the incoming oil parallel and adjacent to the surface allows the air bubbles to rise to the surface, rather than be drawn back into the hydraulic circuit. Other chambers help in condensing oil droplets in the air, and a baffle plate cuts down splashing brought about by rough movement. (3 Jigures, 3000 words)
Filter assemblies In GB 2243793 Pall Corporation describes g filter assembly for the nuclear industry. It consists of several tubular filters welded at one end to a plenum chamber made of plastic by rotational moulding and includes an outlet. The other ends of the filters are closed and supported by a plate attached to a plenum chamber by tie rods. A central rod screws into a captive nut at one end, and has a fitting to facilitate remote handling at the other. By forming the plenum chamber by a rotational moulding process, the tooling can be produced much less expensively than that for a die-casting process. Also, the chamber is produced in one piece, which obviates the requirement for a subsequent manufacturing step. The assembly is cheap and disposable. (3 jIgures, 2700 words)
Blood filter In GB 2243794 Pall Corporation describes a blood filter. It comprises a housing divided by a multi-stage filter element and supported on each side by arrays of concentric ridges defining inlet and outlet distribution zones, and extended to open into a distribution zone through a passage at the bottom of the filter. An outlet is similarly extended to open into another zone by a passage at the top of the filter. Any air expelled in front of incoming liquid flows into an outlet ahead of the liquid. One outlet zone is extended by a vertical diametrical groove, whose cross-section widens upwards and conveys liquid from concentric channels defined by the ridges to an outlet passage. (3 Figures, 2400 words)
Degassing
hydraulic
Copolymides
for membranes
In GB 2244997 The British Petroleum Company plc describes a copolymide. It is prepared by dissolving 3,3’,5,5’-tetramethyl-4,4’-diaminodiphenyl-methane in a solvent, adding to the diamine solution a mixture of 1,4-bis- (3,4dicarbonphenoxy) -2,5-di-tertiarybutybenzene dianhydride and 3,3’,4,4’-bensophenonetetracarboxylic dianhydride in a weight percent ratio from 2O:l to 1:1, and allowing the reactant to polymerise. Membranes, suitable for gas separation and micro- and ultrafiltration applications, may be prepared by dissolving the copolyimide in a solvent, spreading the resultant solution onto a substrate, allowing the solvent to evaporate and subsequently removing the membrane from the substrate. The membrane may be crosslinked with UV radiation. (10 jTgures,
1500 wo?-ds) British
fluid
In GB 2244661 Massey-Ferguson Manufacturing Ltd describes an air removal system especially for use in removing air from the oil of a hydraulic system.
1992
Filter element In GB 2244938 Pall Corporation describes a tubular filter element. It consists of a filter medium enclosed by end caps and an external helically wound ribbon, the turns of which overlap and are bonded to each other and to a medium by *helical lines of adhesion; these may be adhesive strips or involve fusion. The ribbon supports the medium against outward flow filtering or backwashing, withstanding a pressure drop of 75 psi while contributing no more than 10% of the pressure drop across itself. The medium may comprise entangled but unbound fibres and/or ion exchange resin or active carbon. (4 figures, 6000 words)
Patent Spe@ications
can be ordered
Unit 6 Nine Mite Point Industrial
Estate
;
541