Patent ID: 7500298

Claim:
A blast head for loosening scale on a metal surface using media, said blast head comprising: a chamber defining an inlet and an outlet, said inlet sized for the metal surface to pass therethrough into the chamber and said outlet sized and positioned relative to the inlet for the metal surface to pass therethrough and out of the chamber; a supply of media under a fluid pressure; at least one nozzle having an inlet and a outlet, said inlet in fluid communication with the supply of media and said outlet positioned in the chamber and in proximity to the metal surface; a deceleration zone positioned in the chamber and on an opposite side of the chamber from the outlet; and a media outflow zone positioned at a bottom of the chamber; whereby said media is propelled by the fluid pressure through the nozzle and out of the outlet in a spray onto the metal surface such that the spray loosens the scale on the metal surface, said deceleration zone decelerates any errant media missing the metal surface to limit damage to the blast head, and said media outflow zone captures falling media.