Posted by H devereux on October 29, 2001 at 06:36:16:
I have a Crane boiler that is 30 years old that makes a hammering noise when fired. It is running at 15 psi and 185 degrees. The expansion tank has been replaced and it has been acidized 3 time. Each time we have it has been acidized it runs quieter for awhile. Any help will be appreciated....