Patent ID: 7455809
Filing Date: 2008-11-25
Classification: C22B

Abstract:
1. A molten metal pump including a base forming a pumping chamber and an impeller dispersed within said pumping chamber, an outlet in said pump base in fluid communication with said pumping chamber, and further comprising a separable and removable gas injection tube and tube base combination comprising: said gas injection tube defining a gas passageway and having a first end and a second end, the first end having a gas inlet adapted to communicate with an associated gas source, the second end having a gas outlet; and said tube base defining a molten metal stream passage and having an opening in an upper section of the base, the second end of the tube being received in the opening and terminating such that the gas outlet communicates with the molten metal stream passage, the base is configured to complement an outlet of the base such that the molten metal stream passage is aligned with the outlet of the base.