Summary: The following article is a part of National Board
Classic Series and it was published in the National Board
BULLETIN. (4 printed pages) William L. Reeves, P.E President,
ESI Inc. of Tennessee Summary: The following article is a part
of the National Board Technical Series. This article was
originally published in the Summer 1999 National Board BULLETIN.
(7 printed pages) The second article of a three-part series
describing some potentially catastrophic events that power and
recovery boilers are prone to if not properly maintained. IMPACT
DAMAGE TO TUBES When you take a look at a boiler under
construction, it is clear that all parts are not created equal.
This is particularly true with the boiler tubes that make up the
furnace and convection sections. Just as a chain is no stronger
than its weakest link, the failure of a single tube with a value
of only a few hundred dollars can easily require the shutdown of
a multimillion dollar boiler facility. When you consider that
the tube thickness for the press