Search found 1684 matches

by fredrosse
Mon Jun 29, 2020 2:57 pm
Forum: General Steamboat stuff
Topic: Flying a (steaming) kite
Replies: 25
Views: 919

Re: Flying a (steaming) kite

".......Also as long as the expander will go in it should take care of any minor imperfection to the 'round'." The rules for tube expansion require a tube insertion hole that is only a couple of thousanths (human hair diameter) larger than ther tube outside diameter. Getting an "out of round" tube i...
by fredrosse
Thu Jun 25, 2020 3:20 pm
Forum: Technical - Engines and Boilers
Topic: Viability of brazing a tubesheet?
Replies: 13
Views: 413

Re: Viability of brazing a tubesheet?

"Fred, How about silver solder." Silver solders meet the ASME definition for a boiler constructed by brazing, "melting point above 840F (450C)" and could be used for boiler construction. The costs would be much lower with other brazing materials. I think Silver solder for boiler construction is tech...
by fredrosse
Thu Jun 25, 2020 2:13 pm
Forum: Technical - Engines and Boilers
Topic: Opposed-Piston Engine Project - The Steam Version
Replies: 47
Views: 8265

Re: Opposed-Piston Engine Project - The Steam Version

If you machine away the cylinder head portion of the iron engine block, then bore into the iron cylinder a small recess distance (say, one mm) then your long cylinder will fit between the two engine blocks. To eliminate flanges and brazing, just use long tie-bolts to pull the two engine blocks toget...
by fredrosse
Mon Jun 22, 2020 2:24 am
Forum: Anoraks Corner
Topic: Deception?
Replies: 10
Views: 4218

Re: Deception?

Very informative replies, however I am still curious about my posted question...."I would like to know the full meaning of this "Got it!" statement, does anyone know this answer? "
by fredrosse
Sun Jun 21, 2020 3:04 am
Forum: Technical - Engines and Boilers
Topic: Viability of brazing a tubesheet?
Replies: 13
Views: 413

Re: Viability of brazing a tubesheet?

ASME Boiler Code has rules for the construction of power boilers by brazing, defined as filler metal with a melting point above 840F (450C). Several brazing materials are permitted, the great majority are limited to 400F (205C) service, which corresponds to a steam saturation pressure of about 225PS...
by fredrosse
Thu Jun 18, 2020 2:03 am
Forum: Technical - Engines and Boilers
Topic: Monotube Boiler Design – Radical Thinking
Replies: 34
Views: 15827

Re: Monotube Boiler Design – Radical Thinking

OK, now I understand you are thinking of a system where in one moment the pump is a feedwater pump, then it becomes a recircualtion pump, then reverts back to a feedwater pump, etc. I think there would be difficulties, as the duty requirements are so different, while feeding the boiler from the hotw...
by fredrosse
Sun Jun 14, 2020 12:05 pm
Forum: General Steamboat stuff
Topic: Flying a (steaming) kite
Replies: 25
Views: 919

Re: Flying a (steaming) kite

890USD.jpg The original pressure vessel shell for the Margaret S. Boiler, a simple Vertical Firetube (VFT) made in 2010. 16 inch OD x 18 inch high, 48 tubes, 1-1/4 OD x 0.095 wall. 20 square feet heating surface, 60-80 pph steam output. This boiler was designed and fabricated to the American Societ...
by fredrosse
Sun Jun 14, 2020 11:43 am
Forum: General Steamboat stuff
Topic: Flying a (steaming) kite
Replies: 25
Views: 919

Re: Flying a (steaming) kite

In order to promote steamboating, I will volunteer the drawings and the ASME Boiler Code calculations for the boiler mentioned above, unless there is an alternate design that might be better suited to a small steamer. Lets discuss. As a matter of fact, just last week I was in the "candy store for ma...
by fredrosse
Fri Jun 12, 2020 3:47 am
Forum: General Steamboat stuff
Topic: Flying a (steaming) kite
Replies: 25
Views: 919

Re: Flying a (steaming) kite

I would think that a simple VFT would be appropriate. My USA steamer has a simple "Stanley Type" VFT, 16 inch shell diameter, 3/8 wall, 48 tubes 1-1/4 OD x 0.095 wall, 18 inches height. 20 square feet heating surface, producing 60 pph at 100 PSI from 70F feedwater. All welded construction. This desi...
by fredrosse
Sun Jun 07, 2020 9:47 am
Forum: Technical - Engines and Boilers
Topic: Monotube Boiler Design – Radical Thinking
Replies: 34
Views: 15827

Re: Monotube Boiler Design – Radical Thinking

Stean Captain, there are technical problems with the diagram you have presented. As I see it drawn, the feed pump will indeed need to pump all excess flow capacity against full boiler pressure. As you mention, say the feedwater pump flow rate provides 400% of the steam generator flow. For this case,...