BRUCE ARTHUR HOWARD
Pilots at Heather Dr, Monroeville, PA
License number
Pennsylvania A2192357
Issued Date
Sep 2015
Expiration Date
Sep 2017
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
209 Heather Dr, Monroeville, PA 15146
Professional information
Shutdown Seal For Reactor Coolant Pump
US Patent:
2007014, Jun 21, 2007
Filed:
Oct 3, 2006
Appl. No.:
11/543020
Inventors:
Mark Sanville - Souderton PA, US
Reinhold Koeth - Huntingdon Valley PA, US
Bruce Howard - Monroeville PA, US
Bob Mangerie - Saint Clairsville OH, US
Reinhold Koeth - Huntingdon Valley PA, US
Bruce Howard - Monroeville PA, US
Bob Mangerie - Saint Clairsville OH, US
International Classification:
F04B 17/00
US Classification:
417423110
Abstract:
A thermally actuated shutdown seal provides a shutdown seal usable in a pump having a primary seal assembly positioned circumferentially about a rotating shaft for separating a region of high pressure coolant fluid from the shaft. The shutdown seal includes a two-piece interlocked housing which encompasses carbon graphite ring segments positioned circumferentially about the shaft, a garter spring and a series of compression springs. The replaceable insert with machined recess contains the shutdown seal assembly and is biased axially with a wave spring and held with the annular recess by a closure ring. The seal is designed with coolant fluid flow directly in contact with such ring segments and specially designed paths around the ring segments during normal pump operation. The seal requires a thermally actuated means for moving the two-piece interlocked housing axially into a blocking position within the coolant flow path to shutdown and minimize fluid flow bypassing the ring segments and between the ring segments and the pump shaft, upon occurrence of a process failure in the facility served by the pump and consequent temperature rise of the fluid being pumped.
Thermally Activated Shutdown Seals For Rotatable Shafts
US Patent:
8356972, Jan 22, 2013
Filed:
Dec 7, 2009
Appl. No.:
12/631888
Inventors:
Bruce Howard - Monroeville PA, US
Judith Hodgson - Irwin PA, US
Nick Tallos - Narberth PA, US
Glenn Quinty - Horsham PA, US
David Janocko - Pittsburgh PA, US
Charles Bice - Murrysville PA, US
Judith Hodgson - Irwin PA, US
Nick Tallos - Narberth PA, US
Glenn Quinty - Horsham PA, US
David Janocko - Pittsburgh PA, US
Charles Bice - Murrysville PA, US
Assignee:
Westinghouse Electric Company LLC - Cranberry Township PA
International Classification:
F16J 15/00
US Classification:
415136, 415230
Abstract:
A thermally actuated shutdown seal for a rotating shaft having a narrow annular fluid flow path surrounding the shaft. The seal surrounds the shaft with the annulus therebetween during normal operation and constricts against the shaft when the shaft slows or stops rotating. The annulus is maintained open during normal operation by a spacer interposed between opposing ends of a split ring. When the shaft stops rotating, the temperature of the annulus rises, which actuates removal of the spacer from the split ring constricting the split ring against the shaft blocking the annulus. The blocked annulus causes a pressure differential across the seal which urges a polymer seal ring, downstream of the split ring against the shaft which seals the annulus. In one embodiment, the spacer is formed of a meltable material. In a second embodiment, the spacer is removed from the split ring by a thermally responsive actuator.