Santa Fe 2926

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Mark D
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Re: Santa Fe 2926

Postby Mark D » Fri Feb 06, 2015 10:39 pm

Did I miss something? Kevans, I saw you holding the rifle, but though I paged through other photo's, I didn't see any others. From what I could see it did look like a fine rifle.

I sort of figured they would have to be swaged. At out shop, we built a machine to do that too, but it was hydraulic rather than pneumatic. We did some flue's for someone else too recently, but I don't know who that was for. I wasn't involved in that operation. I was busy on other stuff.
Those big flues generally come from Germany, some are damaged in shipment so extras should be ordered, and they do not come swaged. Oh, they do, but it's big $$$. Cheaper to do it yourself even if you have to build a machine to do it.

I don't recall the swaging operation. It might be I missed it because it takes so long for me to download photo's. Even here at home they've been coming in slowly lately. Not sure what's up with that, because we just got done watching a streaming Netflix on the same internet connection. That takes a lot more bandwidth than a few photo's.
Mark D.
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Kevans
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Re: Santa Fe 2926

Postby Kevans » Fri Feb 06, 2015 11:52 pm

No problem, just attribute it.

If you follow the link back to my photobucket page, all the construction photos are there.

http://s570.photobucket.com/user/Thorgierr/library/?sort=3&page=1

Regards,
Kevin







Fitz wrote:Cool rifle, Kevin. Is it OK with you that I copied that photo?

Kevans
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Re: Santa Fe 2926

Postby Kevans » Thu Feb 19, 2015 3:45 pm

Latest set of photos....

http://nmslrhs.org/Photos/2015/02-07/index.html

Regards,
Kevin

Millhouse
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Re: Santa Fe 2926

Postby Millhouse » Fri Feb 20, 2015 2:55 pm

Nice, so by the photos, all the flues are in and superheater work is in progress at this point? Or are the superheaters being started as the flues are being finished up? :D

Mark D
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Re: Santa Fe 2926

Postby Mark D » Fri Feb 20, 2015 7:59 pm

Generally speaking, in my limited experience, all the flues and tubes are installed and rolled and pressure tested for leaks, leaks fixed and tested again until no leaks are present before the superheater elements go in. That leaves room to get in there at the smokebox end to fix leaks.
Mark D.
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John Bohon
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Re: Santa Fe 2926

Postby John Bohon » Sat Feb 21, 2015 10:05 am

Mark is correct. The flues and tubes are now loaded in the boiler. Next they must be rolled, beaded, and welded on the firebox end. Then comes filling the boiler, probably with air pressure first and then with water, and chasing leaks, probably for a few weeks. Not only will some of the tubes leak but so will things like flexable caps, studs, washout plugs, weld seams, and the plumbing. By the time that is finished the boiler will have passed its initial hydro. In the meantime it looks to me like they are starting the fabrication of the new superheather units. These are type E units so there are a lot of them and they are nearly all different since they must be loaded in the somewhat random flues and extend to the header. Only after all the leaks are sealed will the units be ready to load into the boiler. Type E superheaters were complicated enough that the builders usually provided the railroad shops with diagrams showing the correct flues in which to install each set of units.

John Bohon

Millhouse
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Re: Santa Fe 2926

Postby Millhouse » Thu Mar 12, 2015 1:28 pm

Kevans... I've always been curious, 3751 has this too, what's the smaller extra third cylindrical 'chamber' on top of some ATSF cylinder assemblies?

You can see it clearly in this photo on the fireman's side cylinder assembly.

http://www.nmslrhs.org/IMG_1123cropped.jpg

Mark D
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Re: Santa Fe 2926

Postby Mark D » Fri Mar 13, 2015 9:39 am

Millhouse, are you referring to that vertical cylinder you see at the right front of the engine?
If so, I'm pretty sure you're looking at the F side air pump. If not, well, never mind.
Mark D.
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Millhouse
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Re: Santa Fe 2926

Postby Millhouse » Fri Mar 13, 2015 11:32 am

No, it's horizontal and runs parallel to the main cylinder and valve cylinder, and appears to be part of the entire cylinder casting (though smaller than the previous two), on the very top.

The 3751 has something on the top of its cylinder casting that looks pretty much the same as 2926's.

Image
Last edited by Millhouse on Fri Mar 13, 2015 1:40 pm, edited 1 time in total.

Charles T. McCullough
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Re: Santa Fe 2926

Postby Charles T. McCullough » Fri Mar 13, 2015 1:34 pm

OH! Those 2900's were delicious looking locos! Some people refer to these photos as "Choo-Choo porn"... and I am definitely addicted!
Semper Vaporo,
Charles T. McCullough


Pkgs.

Millhouse
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Re: Santa Fe 2926

Postby Millhouse » Fri Mar 13, 2015 1:47 pm

Charles... agree, and what's not to love? She'll be the largest operating 4-8-4 in the world when she's running.

Fitz
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Re: Santa Fe 2926

Postby Fitz » Fri Mar 13, 2015 3:00 pm

I remember reading a dissertation on those cylinders a few years ago, but I can't remember the details. I think Bob Kittel of the 3751 crew explained them, and I'm pretty sure they have to do with steam passage during drifting.
Image

John Bohon
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Re: Santa Fe 2926

Postby John Bohon » Fri Mar 13, 2015 3:31 pm

Judging by the way it is plumbed in I think it must be some sort of drifting valve. Perhaps this is unique to the AT&SF?

John Bohon

Millhouse
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Re: Santa Fe 2926

Postby Millhouse » Fri Mar 13, 2015 3:35 pm

John,

Perhaps. Was looking up other photos of similar era 4-6-2s (3400 class) and the 3600 class 4-6-4s, neither had it.

The big 5000 classes, though, in addition to the 3700 and 2900 classes, appear to have it.

Image

John Bohon
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Re: Santa Fe 2926

Postby John Bohon » Fri Mar 13, 2015 4:51 pm

They are called Wagner cylinder bypass valves, drifting valves in other words. They apparently are a Santa Fe only device. Do a search on your favorite search engine for more information.

John Bohon


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