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Posted by Rick on September 11, 2007 at 07:36:06:
In Reply to: flash tank posted by george on September 06, 2007 at 14:06:02:
: We have #4 high pressure steam boilers(fire tubes) operating @125#, with a MAWP of 150#. Our old flash/blowdonw(atmospheric) tank needed replacement.The company doing the replacement has an R stanp in good standing.(checked via National Board web site). Our old flash tank had a MAWP of 150#. The new tank has a MAWP of 75# With a thermostatic blending valve( like those installed in low pressure plants).How could the new tank have a lower MAWP? Was a mistake made........... THANKS!
In my opinion a big mistake was made. The flash tank, while vented still needs to be rated at the MAWP of the steam that could flash into it. If the vent becomes plugged, the tank must be designed to handle the pressure that it could be subjected to.
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