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Method for forming a flexible carbon composite self-lubricating seal
PATENTS
Patent WO/2016/081434 describes a gasket assembly for sealing between mating flange faces of a flanged connection with a central bore. Included is a seal member (18) that is ring-shaped and has a seal-member profile (20) on an inner diameter. A ring-shaped galvanic anode (32) engages with the sealmember profile (20).
such as those specified by ASME B 16.20, without any modifications to the flanged connection. In one embodiment of this disclosure, a gasket assembly for sealing between mating faces of a flanged connection with a central bore includes a seal member. This is ring-shaped and has a seal-member profile on an inner diameter. The galvanic anode is a ring-shaped member with an outer diameter that engages the seal-member profile, and an inner diameter that is at least as large as the diameter of the central bore. In alternative embodiments, the galvanic anode can be formed from aluminium, magnesium or zinc. It has an axial height that is less than the distance between the mating flange faces. The seal member can be sized to engage a ring-joint groove of the mating flange faces and the galvanic anode can be sized to extend from this groove to the central bore. The gasket assembly may further include an outer ring, which has an inner diameter that engages an outer diameter of the seal member. Patent number: WO/2016/081434 Inventor: I.A. Al-Buraiki Publication date: 26 May 2016
O-ring sealing system for metal, thermoplastic and fibre-reinforced plastic flanges Applicant: Britt Engineering Inc, USA This invention relates to piping systems, but more particularly to an O-ring flange sealing device that can be used to provide a full seal without the need to cut a groove in the flange.
April 2017
The associated patent describes an O-ring seal for pipe flanges, which has a backing ring, an O-ring seal positioned within the backing ring and a vacuum ring positioned within the O-ring seal. The backing ring and the vacuum ring form a rigid base against which mating flanges on pipes can be bolted together, thereby preventing bending of the mating flanges and permitting flange bolts to be “torqued” to their full tensile load limit without damage to the mating flanges. This system is constructed so that the O-ring seal is retained between the mating flanges without the need to position it in a groove in one of the mating flanges. Bending of the flanges is minimised since they are clamped against the backing ring – minimising stresses caused by bending and extending their service life. Patent number: WO/2016/081428 Inventor: W.F. Britt Publication date: 26 May 2016
Highly durable floating oil seal Applicant/Inventor: C. Li, China This patent focuses on what is described as a highly durable floating oil seal, composed of a top–bottom structurally symmetrical sealing-ring body. The working surface of the sealing-ring body is provided with a circle of grooves for accommodating the sealing ring. In addition, a circle of wear-resistant belt is disposed on this surface. This belt is made from an engineering ceramic material or a metal modified and strengthened with an engineering ceramic material. The friction surface of the wear-resistant belt is in the same plane as the working surface of the sealing ring body, or it protrudes relative to the working surface. The floating oil seal effectively improves wear resistance of the working surface and increases its service life. It can be easily manufactured and is relatively inexpensive to produce, says the inventor. Patent number: WO/2016/078623 Publication date: 26 May 2016
Method for forming a flexible carbon composite self-lubricating seal Applicant: Baker Hughes Inc, USA A method has been developed for forming a flexible carbon composite self-lubricating seal. It involves compressing a carbon composite mixture into a mould to form the self-lubricating annular seal. The inventors have found that carbon composites formed from graphite and micro-sized or nano-sized
binders at high temperatures have improved balanced properties compared with graphite alone, a composition formed from the same graphite, but different binders, or a mixture of the same graphite and the same binder, blended at room temperature under atmospheric pressure or high pressure. These carbon composites have excellent elasticity. In addition, the carbon composites have excellent mechanical strength, heat resistance and chemical resistance at high temperatures. In a further advantageous feature, the composites retain various superior properties of the graphite, such as heat conductivity, electrical conductivity, lubricity and the alike. Patent number: WO/2016/085596 Inventors: L. Zhao and Z. Xu Publication date: 2 June 2016
System for regulating differential pressure across a seal Applicant: Vetco Gray Scandinavia As, Norway This patent provides details of a fluidpressure control system and method for regulating the differential pressure across at least one seal by lowering, raising or keeping constant the pressure in a first volume of fluid in relation to the pressure in a second volume of fluid, which is separated from the first volume of fluid by at least one seal. The system comprises pressure sensors, arranged for sensing the pressure in the first volume of fluid and in the second volume of fluid; a controller that generates a motor-control signal based on the detected difference in pressure between the first and second fluid volumes; and a hydraulic displacement unit, which operates in response to the control signal for regulating pressure in the first volume by moving fluid to, or from, the first volume. Patent number: WO/2016/083196 Inventors: T. Kjonigsen, G.Y. Vestbostad and O.P. Tomter Publication date: 2 June 2016
Labyrinth seal Applicant: Schaeffler Technologies Ag & Co. Kg, Germany This patent discusses a labyrinth seal for contactless sealing at the interface of two components that rotate relative to one another. The labyrinth seal comprises an inner ring (01) and an outer ring (02), which have sealing surfaces – opposing in sections – in order to form a sealing gap
Sealing Technology
13
Patent WO/2016/081434 describes a gasket assembly for sealing between mating flange faces of a flanged connection with a central bore. Included is a seal member (18) that is ring-shaped and has a seal-member profile (20) on an inner diameter. A ring-shaped galvanic anode (32) engages with the sealmember profile (20).
such as those specified by ASME B 16.20, without any modifications to the flanged connection. In one embodiment of this disclosure, a gasket assembly for sealing between mating faces of a flanged connection with a central bore includes a seal member. This is ring-shaped and has a seal-member profile on an inner diameter. The galvanic anode is a ring-shaped member with an outer diameter that engages the seal-member profile, and an inner diameter that is at least as large as the diameter of the central bore. In alternative embodiments, the galvanic anode can be formed from aluminium, magnesium or zinc. It has an axial height that is less than the distance between the mating flange faces. The seal member can be sized to engage a ring-joint groove of the mating flange faces and the galvanic anode can be sized to extend from this groove to the central bore. The gasket assembly may further include an outer ring, which has an inner diameter that engages an outer diameter of the seal member. Patent number: WO/2016/081434 Inventor: I.A. Al-Buraiki Publication date: 26 May 2016
O-ring sealing system for metal, thermoplastic and fibre-reinforced plastic flanges Applicant: Britt Engineering Inc, USA This invention relates to piping systems, but more particularly to an O-ring flange sealing device that can be used to provide a full seal without the need to cut a groove in the flange.
April 2017
The associated patent describes an O-ring seal for pipe flanges, which has a backing ring, an O-ring seal positioned within the backing ring and a vacuum ring positioned within the O-ring seal. The backing ring and the vacuum ring form a rigid base against which mating flanges on pipes can be bolted together, thereby preventing bending of the mating flanges and permitting flange bolts to be “torqued” to their full tensile load limit without damage to the mating flanges. This system is constructed so that the O-ring seal is retained between the mating flanges without the need to position it in a groove in one of the mating flanges. Bending of the flanges is minimised since they are clamped against the backing ring – minimising stresses caused by bending and extending their service life. Patent number: WO/2016/081428 Inventor: W.F. Britt Publication date: 26 May 2016
Highly durable floating oil seal Applicant/Inventor: C. Li, China This patent focuses on what is described as a highly durable floating oil seal, composed of a top–bottom structurally symmetrical sealing-ring body. The working surface of the sealing-ring body is provided with a circle of grooves for accommodating the sealing ring. In addition, a circle of wear-resistant belt is disposed on this surface. This belt is made from an engineering ceramic material or a metal modified and strengthened with an engineering ceramic material. The friction surface of the wear-resistant belt is in the same plane as the working surface of the sealing ring body, or it protrudes relative to the working surface. The floating oil seal effectively improves wear resistance of the working surface and increases its service life. It can be easily manufactured and is relatively inexpensive to produce, says the inventor. Patent number: WO/2016/078623 Publication date: 26 May 2016
Method for forming a flexible carbon composite self-lubricating seal Applicant: Baker Hughes Inc, USA A method has been developed for forming a flexible carbon composite self-lubricating seal. It involves compressing a carbon composite mixture into a mould to form the self-lubricating annular seal. The inventors have found that carbon composites formed from graphite and micro-sized or nano-sized
binders at high temperatures have improved balanced properties compared with graphite alone, a composition formed from the same graphite, but different binders, or a mixture of the same graphite and the same binder, blended at room temperature under atmospheric pressure or high pressure. These carbon composites have excellent elasticity. In addition, the carbon composites have excellent mechanical strength, heat resistance and chemical resistance at high temperatures. In a further advantageous feature, the composites retain various superior properties of the graphite, such as heat conductivity, electrical conductivity, lubricity and the alike. Patent number: WO/2016/085596 Inventors: L. Zhao and Z. Xu Publication date: 2 June 2016
System for regulating differential pressure across a seal Applicant: Vetco Gray Scandinavia As, Norway This patent provides details of a fluidpressure control system and method for regulating the differential pressure across at least one seal by lowering, raising or keeping constant the pressure in a first volume of fluid in relation to the pressure in a second volume of fluid, which is separated from the first volume of fluid by at least one seal. The system comprises pressure sensors, arranged for sensing the pressure in the first volume of fluid and in the second volume of fluid; a controller that generates a motor-control signal based on the detected difference in pressure between the first and second fluid volumes; and a hydraulic displacement unit, which operates in response to the control signal for regulating pressure in the first volume by moving fluid to, or from, the first volume. Patent number: WO/2016/083196 Inventors: T. Kjonigsen, G.Y. Vestbostad and O.P. Tomter Publication date: 2 June 2016
Labyrinth seal Applicant: Schaeffler Technologies Ag & Co. Kg, Germany This patent discusses a labyrinth seal for contactless sealing at the interface of two components that rotate relative to one another. The labyrinth seal comprises an inner ring (01) and an outer ring (02), which have sealing surfaces – opposing in sections – in order to form a sealing gap
Sealing Technology
13