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BOILER BUILDING + Other Projects by STEAMHEATON
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   Author  Topic: BOILER BUILDING + Other Projects by STEAMHEATON  (Read 31213 times)
ErieAtlantic7597
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
 
« Reply #700 on: Dec 30th, 2008, 6:20pm »
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   Ray,
 
   Like so many other of our friends here, I also have run clean out of complimentry adjectives to describe your workmanship. I'm just happy for you to see it all coming together.  
 
   Can't wait to see that brute running at the un-meet.
 
   Happy New Year to you and yours,
 
   Bruce


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tomc
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
 
« Reply #701 on: Dec 31st, 2008, 10:25am »
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on Dec 30th, 2008, 5:06pm, pockets wrote:       (Click here for original message)
Thanks Ray. The question just popped into my head and was one that I had never seen addressed on any of the boards I haunt..... Even the ones populated by "experts".Greg B.

Pockets & Ray,   Maybe it has to due with the size as the new boiler built by Boothbay for the WW&F #9 has gone to be stress relieved.  My new bolier built by Marty Knox didn't.  Interesting comment.
 
Tom C.


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tom_srclry_com
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SteamHeaton
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
 
« Reply #702 on: Dec 31st, 2008, 11:37am »
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Greg, that was a great question.   There is always something to learn.   Tom C.,  what size is the WW&F #9 boiler.    Bruce ,  I am looking forward to it running down there too.    Happy New Year to you and  everyone on these boards.  Ray III

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pockets
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
 
« Reply #703 on: Dec 31st, 2008, 12:01pm »
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Ray,
It was a general question. Not aimed at any particular boiler. It occured to me that, given the variety of shapes and sections used in these fabrications, that the internal stresses must be horrific. I'm totally prepared to be wrong on this. I've done enough metal work to know that logic doesn't always apply. I do know that a copper boiler is considered to be in an annealed state, therefore stress relieved, on completion. I wonder if that applies to steel? No, that wouldn't be right, because welding steel generates and locks in stresses.....
 
An interesting experiment, given the resources to trash a new boiler, would be to put one in a 600*F oven for about twelve hours and see what comes out. I don't believe a coal fire, in the firebox, qualifies. It's too localized. The rest of the boiler is full of boiling water and approximately 350* steam. Therefore much cooler and giving inconsistant heat.
 
Shoulda stayed in bed.....!
 
Greg B.


« Last Edit: Dec 31st, 2008, 12:10pm by pockets » Logged


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tomc
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
 
« Reply #704 on: Dec 31st, 2008, 7:11pm »
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on Dec 31st, 2008, 11:37am, SteamHeaton wrote:       (Click here for original message)
Greg, that was a great question.   There is always something to learn.   Tom C.,  what size is the WW&F #9 boiler.    Ray III

 
Ray,  I don't know the size but it is for a 2 foot gauge loco.  I will see if I can find any info on the WW&F web site and get back to you.
 
Tom C.


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SteamHeaton
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
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« Reply #705 on: Jan 1st, 2009, 7:26pm »
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More progress was made on the front tube sheet yesterday.  There will be a total of 4 passes on the front  sheet.    I am half way around on the last pass  now.   The bottom tube holes were  closer to the bottom of the barrel than I would have liked.  Hindsight, I would have raised the tube nest 3/8ths of an inch, and allow more material at the bottom.  While welding ,the bottom of the bottom holes were slightly  undercut.   To fix this I  put an extra pass on the bottom of those holes.  I will grind  most of the bead away them reream those holes.  The supply line needs one more pass.  Then install the 2 dry pipes and weld.  After that I will flip the boiler over , weld the dry pipes and  4 stays .  Then welding will be complete.   the next set of pics will show the extra passes on the bottom holes and welding the front sheet.    Ray III

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« Last Edit: Jan 1st, 2009, 11:22pm by SteamHeaton » Logged
SteamHeaton
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
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« Reply #706 on: Jan 1st, 2009, 7:27pm »
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pic of 2nd pass complete.

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« Last Edit: Jan 1st, 2009, 7:27pm by SteamHeaton » Logged
SteamHeaton
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
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« Reply #707 on: Jan 1st, 2009, 7:30pm »
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pic of 3rd pass

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SteamHeaton
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
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« Reply #708 on: Jan 1st, 2009, 7:31pm »
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making sure everything is clean for the last pass.

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SteamHeaton
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
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« Reply #709 on: Jan 1st, 2009, 7:33pm »
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getting ready to weld.

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SteamHeaton
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
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« Reply #710 on: Jan 1st, 2009, 7:34pm »
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starting to weld

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SteamHeaton
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
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« Reply #711 on: Jan 1st, 2009, 7:36pm »
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welding

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SteamHeaton
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
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« Reply #712 on: Jan 1st, 2009, 7:37pm »
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same as last pic with flash off for different effect.

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« Last Edit: Jan 1st, 2009, 7:40pm by SteamHeaton » Logged
SteamHeaton
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
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« Reply #713 on: Jan 1st, 2009, 7:41pm »
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close up of 4th pass.

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SteamHeaton
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
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« Reply #714 on: Jan 1st, 2009, 7:42pm »
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last pic for tonight. even closer than the last. Ray III

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Dan Watson
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
 
« Reply #715 on: Jan 2nd, 2009, 11:23am »
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on Dec 29th, 2008, 9:11am, pockets wrote:       (Click here for original message)

Technical question: In the construction of our hobby boilers, are the welds stress relieved?
 
Greg B.

 
Greg,  
I don't consider myself as an authority on this subject, but based on my recollection of discussions from a commercial boiler builder, there is a distinction between a "miniature" boiler and a "power" boiler.  Most of our boilers fit into the miniature category, which means they don't exceed 5 cubic feet volume, 16" shell diameter, and a certain max. pressure (either 100 or 125 psi, can't remember for sure).  Power boilers require stress relieving, while miniature boilers don't.  On a miniature boiler, the stresses tend to work themselves out over a period of time.  Probably the two foot gauge boiler is too big to fit the miniature definition, which is why it is stress relieved.
Dan
 


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pockets
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
 
« Reply #716 on: Jan 2nd, 2009, 11:45am »
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Thanks, Dan. That makes a lot of sense.  
 
The range of skills and knowledge in this hobby is mind boggling. It seems that, no matter the seeming weirdness of a question, if you just keep asking sooner or later, someone has the answer. Frequently they have the "why", as well.
 
Thanks again,
Greg B.


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Mechanical engineers build weapons, whereas civil engineers build targets.

When the man at the door said," Alcohol, Tobacco and Firearms", I, naturally assumed it was a delivery!
Bruce_Mowbray
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
 
« Reply #717 on: Jan 2nd, 2009, 1:37pm »
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on Jan 2nd, 2009, 11:23am, Dan Watson wrote:       (Click here for original message)

 
Probably the two foot gauge boiler is too big to fit the miniature definition, which is why it is stress relieved.
Dan
 

 
Only the welds on unstayed surfaces need to be stress relieved. (ASTM ASME rule) With the small sized welded boiler of the 2 foot gauge engine, it may just be easier to stick the whole thing into the oven than go over each weld individually. It takes time and special heating equipment to stress relieve all of the welds that make up a welded boiler.  
 
 
Bruce Mowbray
Springville, PA
http://www.geocities.com/trainhead391/
 
 


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Bruce Mowbray
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ErieAtlantic7597
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
 
« Reply #718 on: Jan 2nd, 2009, 3:41pm »
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   Ray,
 
   In an attempt to get this thread back on the topic of YOUR boiler build, I was wondering how difficult it will be to clear those bores in the front sheet, in order to slide your tubes through. From my own LIMITED expierience of rolling a FEW tubes in the last almost forty years in this hobby, once those holes are clear, I really don't see any problem with rolling your tubes in. Just my humble opinion.
 
   Guys,
 
   For those that want to discuss the heat treating of a welded boiler, might I suggest starting a completely different thread dedicated to that topic.  
 
   Your PITA moderator,
 
   Bruce


« Last Edit: Jan 2nd, 2009, 5:32pm by ErieAtlantic7597 » Logged
SteamHeaton
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
 
« Reply #719 on: Jan 2nd, 2009, 5:09pm »
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Bruce,  The four holes will only need minimal grinding, before I ream them. I finished welding the front sheet last night. I should have the dry pipes in by tomorrow.   Then insert the flues. Ray III

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