F - Mech Eng,Light,Heat,Weapons – 22 – B
Patent
F - Mech Eng,Light,Heat,Weapons
22
B
122/143, 277/18
F22B 37/00 (2006.01) F16L 55/136 (2006.01) F22B 37/22 (2006.01)
Patent
CA 1241245
-45- Abstract of the Disclosure A nozzle dam for providing a fluid-tight seal across a primary fluid nozzle in the plenum of a nucle- ar steam generating vessel includes an elongated shaft coupled at one end thereof to an anchor assembly fric- tionally engageable with the inner surface of the noz- zle to anchor the dam in place and a fluid-impermeable seal apparatus coupled to the shaft and closing the noz- zle and frictionally engageable with the inner surface thereof to form a fluid-tight seal. The seal apparatus includes a circular plate disposable in wedging fric- tional engagement with a frustoconical portion of the nozzle inner surface. The shaft extends through a cen- tral aperture in the plate and is threadedly engaged with a nut which holds the plate in place. The anchor assembly includes a foldable tripod arrangement coupled to the shaft in such a way that movement of the shaft toward the seal plate effects an increase in the fric- tional anchoring force. The seal assembly also includes an inflatable por- tion. In one embodiment this inflatable portion ex- tends around the perimeter of the seal plate and is radially expandable. In another embodiment the inflat- able portion includes inflatable pillows disposed be- tween the seal plate and the anchor assembly and inflatable for completely closing the nozzle. A foldable tripod centering mechanism and a shaft tensioning tool are also disclosed.
479958
Calhoun Gregory L.
Dawson Paul H.
Kramer Arthur W.
Wilhelm John J.
Oldham And Company
Westinghouse Electric Corporation
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