Method and apparatus for testing the integrity of a shroud...

Details Method and apparatus for testing the integrity of a shroud... Method and apparatus for testing the integrity of a shroud...

2007-04-05

2009-12-08

Kastler, Scott (Department: 1793)

Metallurgical apparatus

Process

Plugging or tapping

C164S474000, C164S475000, C222S603000

Reexamination Certificate

active

07628952

ABSTRACT:
Molten steel is conducted by a tubular shroud interconnecting a slide gate at a bottom tap hole of a ladle with the molten steel in an underlying tundish of a continuous caster. The flow path is confirmed to be isolated from contaminants in atmospheric air by applying a source of partial vacuum to the internal cavity of tubular shroud to allow prevailing atmospheric pressure acting on molten steel in a tundish to push molten steel upwardly in the internal cavity of the tubular shroud. A measure of the partial vacuum in the cavity of the shroud is used to assess the integrity of the gas tight seal. Before and after the integrity of the gas tight seal is determined, a three way valve is used to apply an inert gas to the volume in the cavity of the shroud.

REFERENCES:
patent: 5645121 (1997-07-01), Barnes
patent: 6250521 (2001-06-01), Assar
patent: 2007/0114002 (2007-05-01), Blejde et al.

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