On Tue, 10 Jun 2008 10:39:40 -0400, "Roger Long"
wrote:

The oxygen in this region
of stagnant water was not replenished fast enough to keep the surface of the
stainless intact and crevice corrosion started.

I have a text published by Babcock and Wilcox titled 'Steam'. I got
the impression reading it that boiler water should be oxygen free. The
things are made of plain carbon steel.

Casady