Blistering might be...

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Posted by Roger Link on April 19, 2000 at 07:13:20:

In Reply to: Re: Root Cause of Tube Failure posted by Tony Conner on April 19, 2000 at 05:22:00:

: : What are steps to determine root cause of tube failure in a once through water tube boiler? Can metallurgical analysis provide useful answers? Can swelling/blistering of tubes be caused by impact of steam from nearby leaking tube or is it from problems prior to leak event?

: Check the "Handbook of Industrial Water Conditioning" by Betz. It has a section on boiler system failures, with excellent photographs of tubes that have failed for a variety of reasons. They're mostly due to loss of flow or deposits. I'm not aware that a leaking tube will result in blistering of adjacent tubes. The only thing I've seen is a tube leak cut a nearby tube. Improperly drained or positioned soot-blowers can do the same thing.

caused by either a low water condition in which the tubing or shell is over heated when the water level drops too low or excessive build up of scale around the damaged area not allowing the water to cool the metal.

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