Cathodic protection system for air compressor tanks

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;
• 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;
• a port in the tank;
• a second plug removably positionable in the port to seal the tank, the second plug made from an electrically conductive material;
• and
• a second anode disposed within the tank, wherein the second anode is interconnected to the second plug in an electrically conductive relationship.

A pressure vessel comprising:

• a tank defining an enclosed interior volume, the tank haying a main port and a tell-tale port;
• a main plug removably positionable in the main port to seal the tank, the main plug coupled to the tank in an electrically conductive relationship;
• a primary anode disposed within the tank, and interconnected in an electrically conductive relationship to the main plug;
• and
• a tell-tale plug removably positionable in the tell-tale port to seal the tank, the tell-tale plug coupled to the tank in an electrically conductive relationship, the tell-tale plug comprising:
• a passage extending at least partially trough the tell-tale plug;
• and
• a tell-tale anode coupled to the tell-tale plug in an electrically conductive relationship, the tell-tale anode disposed between the interior volume and the passage, wherein the tell-tale anode is exposed to the interior volume and seals the passage from the interior volume.

A corrosion protection device for a pressurized steel tank having a port, the corrosion protection device comprising:

• a plug removably positionable in the port to seal the tank, the plug coupled to the tank in an electrically conductive relationship;
• an anode coupled to the plug in an electrically conductive relationship, wherein the anode is exposed to the interior volume of the tank when the plug is positioned in the port;
• a passage extending through the plug, the passage in fluid flow communication with the outside atmosphere, wherein the anode is disposed between the passage and the interior volume and seals the passage from the interior volume;
• and
• a second anode disposed within the tank, wherein the second anode does not directly contact the tank, and the second anode is interconnected in an electrically conductive relationship to the tank and
• wherein the anode is made from a material that corrodes at a faster rate than the tank corrodes.