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Posted by BT Bill on January 14, 2004 at 06:39:53:
In Reply to: Re: 600# 700 degree superheated steam boiler bottom blows posted by David on January 12, 2004 at 06:45:29:
: Outside roof tube blew? I doubt it was the bottom blow. Those old units were built like tanks and unlike today were almost always built over spec to handle these things. Especially when considering it was only running at 75% load. You may want to NDT tubes in that area for possible thinning. If the tube was removed check it out. What does the blown tube look like?
Remember they beat that "never bottom blow a steaming boiler" stuff into our head for a reason. A Navy or Marine boiler is all heating surface. Disrupting circulation with a bottom blow in those boilers was bad juju.
Look at a Navy D type. It will produce 120,000 pph roughly. A comparable civilian boiler will be 3 times as big and more tubes baffles etc. While it is still not an accepted practice. Limited blows for a chemistry excursion is acceptable and the norm in many places. Add in the boiler was at 75% load and I think you had or have another problem.
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