Plumbing Through Smokebox

This forum is dedicated to the Live Steam Hobbyist Community.

Moderators: cbrew, Harold_V

gregudolph
Posts: 17
Joined: Sun Mar 13, 2005 1:43 pm

Plumbing Through Smokebox

Post by gregudolph » Wed Jan 12, 2022 7:44 pm

All,
I’m working on plumbing up a steam pump and I’d like to plumb the exhaust through the smokebox and out the stack. Looking for ideas of how others plumbed through the wall of the smokebox.
Thanks!

User avatar
cbrew
Posts: 3032
Joined: Sat Jan 04, 2003 12:17 pm
Location: Vancouver Wa

Re: Plumbing Through Smokebox

Post by cbrew » Wed Jan 12, 2022 7:57 pm

machine up a bulk head fitting. OD with 5/16-27 thread. ID 1/4-40 on the outside and inside.
basically a long reducer with ID threads on both ends.
If it is not live steam. its not worth it.

User avatar
Bill Shields
Posts: 7748
Joined: Fri Dec 21, 2007 4:57 am
Location: Somewhere in the World
Contact:

Re: Plumbing Through Smokebox

Post by Bill Shields » Thu Jan 13, 2022 5:41 am

Same idea but as a 90 degree elbow.

Attach a long piece of 3/16 tube to the inside and bend to suit.

Another way to do it is to put the pump exhaust directly into the manual blower line.

Each has advantages (cosmetically) and disadvantages (back pressure) and complexity.

90% of the time I just run a short line from the pump up the side of the outside of the smoke box and terminate near the top of the stack...or just dump outer the side and the heck with it.
Too many things going on to bother listing them.

Soot n' Cinders
Posts: 929
Joined: Wed Jun 27, 2012 5:24 pm
Location: Marietta, Georgia

Re: Plumbing Through Smokebox

Post by Soot n' Cinders » Thu Jan 13, 2022 8:11 am

I just drilled a hole a stuck a nipple through with some high temp loctite. Could also caulk it in with a chisel or punch too.
-Tristan

Projects
-2.5" scale Class A 20 Ton Shay

Steam Siphon: https://www.shapeways.com/shops/leavitt ... tive-works

Steve Goodbody
Posts: 217
Joined: Thu May 25, 2006 7:16 am

Re: Plumbing Through Smokebox

Post by Steve Goodbody » Thu Jan 13, 2022 9:46 am

Hi Greg,

Here are a couple of pictures of a 90 degree smokebox fitting and setup that may be of help.

On the inside of the smokebox, the fitting consists of a male thread which pokes through the hole in the smokebox and then a washer and nut to clamp the fitting to the smokebox wall and make the seal. That same male thread continues further inside, as it is also provides the thread for the compression union at the end of the fitting for attaching the internal pipe.

Make the male threaded portion as long as you need to bring the internal pipe union to a place where you can get a wrench on it to assemble.
Smokebox Union 2 Small.jpg
P1011089.JPG
P1011093.JPG
Best regards
Steve

User avatar
cbrew
Posts: 3032
Joined: Sat Jan 04, 2003 12:17 pm
Location: Vancouver Wa

Re: Plumbing Through Smokebox

Post by cbrew » Thu Jan 13, 2022 10:00 am

I have used both methods (fitting as i described above and a slip fitting pipe) both methods work
Attachments
IMG_20180207_153618.jpg
IMG_20180206_160934.jpg
IMG_20180206_155424.jpg
IMG_20180206_155332.jpg
If it is not live steam. its not worth it.

Glenn Brooks
Posts: 2664
Joined: Mon Nov 10, 2014 1:39 pm
Location: Woodinville, Washington

Re: Plumbing Through Smokebox

Post by Glenn Brooks » Thu Jan 13, 2022 11:47 am

Some prototype locomotives had a small, separate exhaust nozzle fitted immediately behind the stack, on top of the smoke box. You’ll see a separate smaller trail of exhaust behind the main, firebox exhaust. I suspect the separate exhaust was done to not interfere with the draft through the smokebox, or vice versa..., or maybe make routine maintenance easier,,,

Glenn
Moderator - Grand Scale Forum

Motive power : 1902 A.S.Campbell 4-4-0 American - 12 5/8" gauge, 1955 Ottaway 4-4-0 American 12" gauge

Ahaha, Retirement: the good life - drifting endlessly on a Sea of projects....

User avatar
Bill Shields
Posts: 7748
Joined: Fri Dec 21, 2007 4:57 am
Location: Somewhere in the World
Contact:

Re: Plumbing Through Smokebox

Post by Bill Shields » Thu Jan 13, 2022 6:13 pm

Yes to all...
Too many things going on to bother listing them.

User avatar
Bill Shields
Posts: 7748
Joined: Fri Dec 21, 2007 4:57 am
Location: Somewhere in the World
Contact:

Re: Plumbing Through Smokebox

Post by Bill Shields » Fri Jan 14, 2022 3:57 pm

Actually...Bob Thomas (B&O Bob) just made me giggle by jogging my currently addled brain:

Has anyone looked up the definition of 'plumbing' ??? (other than after my occasional reminding posters to do so?)

In the strictest definition of 'plumbing through smokebox' -> it would be a smelly affair indeed.... :lol:
Too many things going on to bother listing them.

gregudolph
Posts: 17
Joined: Sun Mar 13, 2005 1:43 pm

Re: Plumbing Through Smokebox

Post by gregudolph » Fri Jan 14, 2022 8:53 pm

Thanks for the suggestions, all. I think I have some direction now.

User avatar
makinsmoke
Posts: 2041
Joined: Thu Jul 10, 2003 12:56 pm
Location: Texas Hill Country

Re: Plumbing Through Smokebox

Post by makinsmoke » Fri Jan 14, 2022 10:16 pm

I seem to recall you making that distinction more than once, Mr. Bill!

User avatar
Fender
Posts: 2959
Joined: Wed May 02, 2007 8:33 pm
Location: Chattanooga TN

Re: Plumbing Through Smokebox

Post by Fender » Sat Jan 15, 2022 1:33 pm

Glenn Brooks wrote:
Thu Jan 13, 2022 11:47 am
Some prototype locomotives had a small, separate exhaust nozzle fitted immediately behind the stack, on top of the smoke box. You’ll see a separate smaller trail of exhaust behind the main, firebox exhaust. I suspect the separate exhaust was done to not interfere with the draft through the smokebox, or vice versa..., or maybe make routine maintenance easier,,,

Glenn
Usually, the separate exhaust was used on oil-burning locomotives, for the reason you mention. Coal-burning locos generally exhausted the pump through the cylinder exhaust port.
Dan Watson

Post Reply