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System for releasing gas into molten metal

  • US 8,440,135 B2
  • Filed: 05/13/2008
  • Issued: 05/14/2013
  • Est. Priority Date: 07/12/2002
  • Status: Active Grant
First Claim
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1. A metal-transfer conduit extending from an outlet of a molten metal pump base and comprising:

  • (a) a first end configured for connecting to the outlet of the molten metal pump base, the molten metal pump base comprising a pump chamber;

    (b) a second end opposite the first end;

    (c) a passage defined between the first end and the second end, the passage tangential to, and in fluid communication with, the pump chamber when the metal-transfer conduit is attached to the pump base, the passage comprising;

    (i) a first section including a first cross-sectional area;

    (ii) a second section downstream of the first section and including a second cross-sectional area, the second cross-sectional area being greater than the first cross-sectional area; and

    (iii) a gas-release opening in one or more of the group consisting of;

    the first cross-sectional area of the first section and the second cross-sectional area of the second section.

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