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Does anyone out there peform calculations for changes to small low pressure boilers? A colleague has a project involving re-rating some boilers from 15 lb steam to 30 lb hot water (they are not currently rated for hot water) and also installing larger nozzles for the water return line. The...

The stubs in question are similar to scenario #1 by boilerone above. I have since learned from B&W that since we are using thicker tubes (0.250" wall versus 0.165" as originally designed) the stubs are not required and we can weld the tubes directly into the header. The rows the stubs were...

I have a lot more information to share on this, but in the interest of brevity: A boiler repair (B&W A-style Cyclone) we're working on has some socket style fittings that fit into the intermediate superheat header and connect the tubes to the header. They are similar to a sock-o-let except...

All of the tubes appear to be rolled into the steam drum the same way. They do appear to be intentionally installed this way. Thanks for your feedback saplanti but I'd still like to know WHY the tubes do not take full advantage of the full steam drum thickness. The tubes in the mud drum...

While working on a 1960's vintage B&W boiler, we noticed that the generating bank tubes only penetrate the steam drum about one inch, or one half its thickness. The steam drum is 36 inches ID and is 2.25 inches thick. We're used to seeing the tubes penetrate fully plus 3/16 plus or minus and...

I wouldn't be concerned about a few weeping tube to tubesheet connections, especially at 150% MAWP. We regularly hydro boilers at around 80% MAWP after repair work and sometimes see weepers that will disappear as soon as the boiler is fired up and the tubes are allowed to further expand into...

myrdale, Depending upon your location you may be required to have a State Boiler Inspector witness the hydro of a new boiler. This is the case in MN and I assume other states as well. This is typically based on 1.5 x MAWP. You should have the boiler completely full of water (no air at...