Patent ID: 6770177
Filing Date: 2004-08-03
Classification: C23F,F17C

Abstract:
A pressure vessel comprising:a tank having a tank wall and including a tank opening in the tank wall, the tank wall defining an enclosed interior volume; a corrosion protection device removably positionable in the tank opening to seal the tank, the corrosion protection device including a plug and an anode, the plug coupled to the tank in an electrically conductive relationship, the anode coupled to the plug in an electrically conductive relationship, such that when the plug is positioned in the tank opening the anode is exposed to the interior volume of the tank; and a passage extending at least partially through the corrosion protection device, the passage in fluid flow communication with the outside atmosphere, the anode disposed between the passage and the interior volume to seal the passage from the interior volume wherein the plug has a let down valve movable between an open position and closed position, and the let down valve may release moisture and pressure from within the tank when the let down valve is in the open position.