Search found 1660 matches

by ccvstmr
Sun Oct 13, 2019 5:57 pm
Forum: Live Steam
Topic: 730 Old Boiler Dissection
Replies: 75
Views: 18871

Re: 730 Old Boiler Dissection

The upper portion of the tube sheet is pretty much gone. It corresponds with being the hottest area of the boiler. Could be a good case for making the crown and tube sheets on the firebox end much thicker in future builds, even if one has to add a few more tubes to offset the loss in heat conductio...
by ccvstmr
Fri Oct 11, 2019 10:02 pm
Forum: Live Steam
Topic: 730 Old Boiler Dissection
Replies: 75
Views: 18871

Re: 730 Old Boiler Dissection

Carl, have you been able to clean up the staybolts? I am curious how thick was the calcium build up around the shafts, and if you observed much staybolt deterioration ? BTw this is a really valuable thread for me. Very informative to actually see these effects - processes we all worry about but nev...
by ccvstmr
Mon Oct 07, 2019 9:42 am
Forum: Live Steam
Topic: 730 Old Boiler Dissection
Replies: 75
Views: 18871

Re: 730 Old Boiler Dissection

Sedimental Journey One of the puzzle pieces that I haven't described yet is in regards to the tan colored residue/sediment that's coating the boiler interior. I'll re-post the following photo... IMG_1574.JPG There is gentleman that frequents HDS Shop #2 to work on his model engineering project. We'...
by ccvstmr
Sun Oct 06, 2019 6:59 pm
Forum: Live Steam
Topic: 730 Old Boiler Dissection
Replies: 75
Views: 18871

Re: 730 Old Boiler Dissection

Dan, Russ and BDD... Appreciate your comments. Glad to know the information and experiences (?) provided in this thread, are helping fellow live steamers! Learned at work many years ago, it's sometimes better to know what NOT to do...than to know what to do! Used to say some of the specifications I ...
by ccvstmr
Sat Oct 05, 2019 7:06 pm
Forum: Live Steam
Topic: 730 Old Boiler Dissection
Replies: 75
Views: 18871

Re: 730 Old Boiler Dissection

A number of readers/contributors have commented about water aeration. Allow me to describe the water system at my local club. Two buildings with a combined roof area of approx. 1400 sq. ft. are used to collect rain water. This water flows to an intermediate stainless steel collection tank of some 50...
by ccvstmr
Sat Oct 05, 2019 6:43 pm
Forum: Live Steam
Topic: 730 Old Boiler Dissection
Replies: 75
Views: 18871

Re: 730 Old Boiler Dissection

What about thickening the crown sheet, or potentially fire brick the fire box top and sides to eliminate that? Even if it means having to fit an extra tube or two into the boiler to make up for the lost heat transfer area of the top of the firebox to the boiler? Because it's directly above the fire...
by ccvstmr
Sat Oct 05, 2019 6:29 pm
Forum: Live Steam
Topic: 730 Old Boiler Dissection
Replies: 75
Views: 18871

Re: 730 Old Boiler Dissection

One thing that struck me about this boiler design is that the builder looks to have built the crown sheet flat on top, with very sharp radius corners. My two boilers, a code boiler in 1950, the other, a riveted boiler from early 1900’s both have round crown sheets - no flat top surfaces, and very s...
by ccvstmr
Tue Oct 01, 2019 2:59 pm
Forum: Live Steam
Topic: 730 Old Boiler Dissection
Replies: 75
Views: 18871

Re: 730 Old Boiler Dissection

I just realized something, so this boiler (the cut apart one) was originally steel tubes and they were replaced with copper. Copper and Steel are a fair distance apart on the galvanic reaction chart, i.e. the steel will be consumed as the "anode" in the "battery". Heat speeds the process, and the c...
by ccvstmr
Tue Oct 01, 2019 2:43 pm
Forum: Live Steam
Topic: 730 Old Boiler Dissection
Replies: 75
Views: 18871

Re: 730 Old Boiler Dissection

Very interesting discussion. Ryan’s idea about using sacrificial zincs is intriguing. One thing that struck me about this boiler design is that the builder looks to have built the crown sheet flat on top, with very sharp radius corners. My two boilers, a code boiler in 1950, the other, a riveted bo...
by ccvstmr
Tue Oct 01, 2019 2:33 pm
Forum: Live Steam
Topic: 730 Old Boiler Dissection
Replies: 75
Views: 18871

Re: 730 Old Boiler Dissection

I suspect the horizontal crown sheet corroded quicker than the vertical side walls because the of 3 factors. First the crown sheet is more prone to scale build up staying in place, second the fire is directed towards it, and third the side walls have better heat removal buy the convection of the bo...
by ccvstmr
Tue Oct 01, 2019 2:23 pm
Forum: Live Steam
Topic: 730 Old Boiler Dissection
Replies: 75
Views: 18871

Re: 730 Old Boiler Dissection

Carl, The tester I bought came with “testing standard”, which is a coin-shaped piece of steel of known thickness (I believe it is 4 mm). There are several things that will prevent a clear reading. If the surface is rough or pitted (on either side), or if the surface is not sufficiently flat, such a...
by ccvstmr
Sat Sep 28, 2019 2:41 pm
Forum: Live Steam
Topic: 730 Old Boiler Dissection
Replies: 75
Views: 18871

Re: 730 Old Boiler Dissection

I still don't understand what process thinned out that crown sheet relative to the rest of the sheets. Am I to understand that a new one was welded in at some point? Hello doublereefed... The "thinning process"? Would attribute that to rust formation during periods of non-use (poor dry-out practice...