Method and apparatus for cathodic protection of metal piping.

摘要

According to the present invention a cathodic protection system for metal piping systems and fittings, therefore, is possible which is easy to install and manufacture. The system for fitting uses a unique sacrificial washer (50) or sacrificial nut installed on the bolts (42) used to fasten the fitting and includes a nonsacrificing portion (51) to maintain the mechanical connection during and after depletion of the sacrificing metal. A unique ring anode (20) is also taught which is secured to the bellmouth (4) of a section of pipe (2) to provide an extension thereof which can be factory or field installed. Preferably each anode is designed to protect two connected pipe sections or a pipe section and fitting.