At 04:18 PM 11/10/01 EST, you wrote: >Trent, Another reason may be that the point (or area) of most aggressive and invasive corrosion in a boiler is the area or line where water turns to steam. Since in a superheater tube a further "steaming" is taking place, going from a saturated state to a less saturated state, and through 360° of the tube wall, theoretically there should be some corrosion taking place in the tube. Add to this the abrasiveness of flowing steam, which will increase as its temp rises, and you have something eating away at both faces of the tube. Quite a hostile environment.
Cheers, Harry
