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Shaft seal assembly for a hydrogen-cooled turbine
PATENTS basic composition of the raw material is composed of 16–28 wt% of NBR, serving as the rubber; 4–8 wt% of an aramid fibre, serving as the reinforcing fibre; 10–20 wt% of a needlelike dolomite, serving as the reinforcing fibre; 8–20 wt% of silica particles, serving as the filler; and the balance, an inorganic filler. Publication number: WO/2009/142292 Inventors: K. Fujiwara, K. Akiyoshi, Y. Hamada, Y. Nagai and S. Mochizuki Publication date: 26 November 2009 Editor’s note: The diagrams in this patent show a laminated structure but this is not discussed in the English abstract.
Seal device Applicant: Aktiebolaget Somas Ventiler, Sweden A seal and method of assembly is detailed that permits the use of an exfoliated graphite, PEEK, PPS or PTFE seal ring in a valve. The seal can be used as a split-ring to avoid over extension. Publication number: WO/2009/142575 Inventor: C. Nilsson Publication date: 26 November 2009
Seal and seal/boss assembly Applicant: Hewlett-Packard Development Co Lp, USA This patent provides details of a seal for the ink passages of an inkjet printer. It is designed to have improved resilience so that a replacement cartridge can be installed with minimum effort but reliable sealing is still achieved. Publication number: WO/2009/142625 Inventor: M.A. Smith Publication date: 26 November 2009
Electrolytic cell stack sealing gasket Applicant: Parker-Hannifin Corp, USA An electrolytic cell employs a plastic moulded frame component with raised ridges on one surface to create a seal with a proton exchange membrane (PEM), and on the opposite surface a groove with an interlocking feature for accepting a tabbed elastomer gasket. The gasket and frame design, when combined with a PEM, can be stacked in multiple layers. The frame captures the softer elastomeric sealing material, preventing elastomeric creep and loss of positive seal caused by the relaxation of mechanical hardware under load and internal pressure fluctuations. The addition of the ridged sealing surface provides positive surface contact with the membrane to further prevent the loss of
March 2010
A dry gas seal arrangement, with sensors providing signals to a programmable logic controller to optimise seal running conditions (patent WO/2009/143213).
sealing under mechanical load. The interlocking feature reduces assembly time and improves assembly accuracy. Publication number: WO/2009/142653 Inventor: J.J. Ronan Publication date: 26 November 2009
Shaft seal assembly for a hydrogen-cooled turbine Applicant: Siemens Energy Inc, USA In this patent, a shaft-seal assembly for hydrogen that is based on lubricated carbon segment seals is described. The seal segments are held in a carrier that is insulated from the main turbine casing. There is provision for an oil circulation system to lubricate the hydrogen seals. A particular feature of this design is that the carbon segment seals can be inspected and serviced without disturbing the insulating flange, thus avoiding potential insulation break-down problems. Publication number: WO/2009/142687 Inventors: D.M. Freal, J.M. Emery and J.M Nemeth Publication date: 26 November 2009
Seal monitoring and control system Applicant: John Crane Inc, USA A seal monitoring and control system for a dry gas seal includes various sensors providing signals to a programmable logic control system. It is used to determine a presence of an anomalous operating condition of the seal. The supply system includes a control unit and sensors for measuring seal operating parameters, supply-system operating parameters relative to the flow of treated gas, and
compressor operating parameters. The control system provides an output in response to the operating condition. Conditions monitored may include product gas temperature and pressure, buffer gas conditions and compressor shaft position. Control actions may be initiated to avoid conditions such as condensate carry over to the seals. Publication number: WO/2009/143213 Inventors: E. Shamseldin, J. Delrahim, P. Hosking, J.L. Savio and V. Bakalchuk Publication date: 26 November 2009
Flange joint Applicant: GS-Hydro Oy, Finland A flange joint assembly has been developed in which one of the flanges is designed to permit circumferential rotation of the flange, in the conventional sense, around the pipe to enable alignment of the bolt holes. The rotatable flange is located on a circular locking ring, positioned in a matching locking ring groove on the flange and pipe. The design of the grooves and the contact between the locking ring and groove profile are covered in detail. It is claimed that the locking ring is also reuseable. Publication number: WO/2009/144359 Inventor: R. Eriksson Publication date: 3 December 2009
Non-contact seal for a gas-turbine engine Applicant/Inventor: J.F. Justak, USA A hybrid design of seal that, in effect, is a ‘shoed’ labyrinth arrangement, forms the subject of this patent. A section of seal, or shoe, is suspended on a beam-spring assembly to main-
Sealing Technology
13
Seal device Applicant: Aktiebolaget Somas Ventiler, Sweden A seal and method of assembly is detailed that permits the use of an exfoliated graphite, PEEK, PPS or PTFE seal ring in a valve. The seal can be used as a split-ring to avoid over extension. Publication number: WO/2009/142575 Inventor: C. Nilsson Publication date: 26 November 2009
Seal and seal/boss assembly Applicant: Hewlett-Packard Development Co Lp, USA This patent provides details of a seal for the ink passages of an inkjet printer. It is designed to have improved resilience so that a replacement cartridge can be installed with minimum effort but reliable sealing is still achieved. Publication number: WO/2009/142625 Inventor: M.A. Smith Publication date: 26 November 2009
Electrolytic cell stack sealing gasket Applicant: Parker-Hannifin Corp, USA An electrolytic cell employs a plastic moulded frame component with raised ridges on one surface to create a seal with a proton exchange membrane (PEM), and on the opposite surface a groove with an interlocking feature for accepting a tabbed elastomer gasket. The gasket and frame design, when combined with a PEM, can be stacked in multiple layers. The frame captures the softer elastomeric sealing material, preventing elastomeric creep and loss of positive seal caused by the relaxation of mechanical hardware under load and internal pressure fluctuations. The addition of the ridged sealing surface provides positive surface contact with the membrane to further prevent the loss of
March 2010
A dry gas seal arrangement, with sensors providing signals to a programmable logic controller to optimise seal running conditions (patent WO/2009/143213).
sealing under mechanical load. The interlocking feature reduces assembly time and improves assembly accuracy. Publication number: WO/2009/142653 Inventor: J.J. Ronan Publication date: 26 November 2009
Shaft seal assembly for a hydrogen-cooled turbine Applicant: Siemens Energy Inc, USA In this patent, a shaft-seal assembly for hydrogen that is based on lubricated carbon segment seals is described. The seal segments are held in a carrier that is insulated from the main turbine casing. There is provision for an oil circulation system to lubricate the hydrogen seals. A particular feature of this design is that the carbon segment seals can be inspected and serviced without disturbing the insulating flange, thus avoiding potential insulation break-down problems. Publication number: WO/2009/142687 Inventors: D.M. Freal, J.M. Emery and J.M Nemeth Publication date: 26 November 2009
Seal monitoring and control system Applicant: John Crane Inc, USA A seal monitoring and control system for a dry gas seal includes various sensors providing signals to a programmable logic control system. It is used to determine a presence of an anomalous operating condition of the seal. The supply system includes a control unit and sensors for measuring seal operating parameters, supply-system operating parameters relative to the flow of treated gas, and
compressor operating parameters. The control system provides an output in response to the operating condition. Conditions monitored may include product gas temperature and pressure, buffer gas conditions and compressor shaft position. Control actions may be initiated to avoid conditions such as condensate carry over to the seals. Publication number: WO/2009/143213 Inventors: E. Shamseldin, J. Delrahim, P. Hosking, J.L. Savio and V. Bakalchuk Publication date: 26 November 2009
Flange joint Applicant: GS-Hydro Oy, Finland A flange joint assembly has been developed in which one of the flanges is designed to permit circumferential rotation of the flange, in the conventional sense, around the pipe to enable alignment of the bolt holes. The rotatable flange is located on a circular locking ring, positioned in a matching locking ring groove on the flange and pipe. The design of the grooves and the contact between the locking ring and groove profile are covered in detail. It is claimed that the locking ring is also reuseable. Publication number: WO/2009/144359 Inventor: R. Eriksson Publication date: 3 December 2009
Non-contact seal for a gas-turbine engine Applicant/Inventor: J.F. Justak, USA A hybrid design of seal that, in effect, is a ‘shoed’ labyrinth arrangement, forms the subject of this patent. A section of seal, or shoe, is suspended on a beam-spring assembly to main-
Sealing Technology
13