Results 1 to 12 of 12
  1. #1
    Join Date
    May 2002
    Location
    evansville indiana
    Posts
    943

    threaded steel pipe for a suction line

    I had a customer today that wanted me to make a copper to steel transition .

    This is for a rig to cool natural gas so they can crack it.

    Evap temp is gonna run -10f

    They wanted to run the suction line in schedule 80 threaded pipe . I said not a good idea ,may hold at first bit after cycling the machine I was afraid thermal expansion and contraction would cause leaks . They are now going to socket weld it . They wouldn't let me run copper as they already have pipe and firings and say they are close to losing money on this deal.

    Am I correct in telling them no threaded steel for refrigerant? ...
    mikeacman

  2. #2
    Join Date
    May 2002
    Location
    evansville indiana
    Posts
    943
    dammit ,wrong forum
    mikeacman

  3. #3
    Join Date
    Jan 2009
    Location
    Not in Iran
    Posts
    1,091
    Steel does not have the same heat transfer as coper
    no signature blast'em man blast'em
    !!!KILL THE TERRORIST!!!

  4. #4
    Join Date
    Jan 2008
    Location
    Dallas ,Texas
    Posts
    3,712
    Quote Originally Posted by milkyway View Post
    Steel does not have the same heat transfer as coper
    Will it matter if it's just a suction line it just allowing refrigerant to move? Wonder what the tubes on chillers were made of in WWII ? Hmmmm
    UA 100

    It takes three people to do anything around here. Two do the work, one explains to the crowd of people who showed up when they seen smoke and flames.

  5. #5
    Join Date
    Sep 2007
    Posts
    175
    do chillers go back that far?

  6. #6
    Join Date
    Feb 2004
    Location
    Western New York
    Posts
    1,047

    Gas stripper

    Check out the pics on my profile. We built this stripper a few years ago, and the only leak source was the threaded pipe plugs on the chiller barrel. This stripper runs at -25 deg F. Stick with all copper, or walk away. You aren't talking that much piping, are you?
    Experience is what you have an hour after you need it.

  7. #7
    Join Date
    May 2002
    Location
    evansville indiana
    Posts
    943
    Quote Originally Posted by baub View Post
    Check out the pics on my profile. We built this stripper a few years ago, and the only leak source was the threaded pipe plugs on the chiller barrel. This stripper runs at -25 deg F. Stick with all copper, or walk away. You aren't talking that much piping, are you?
    yep, they are assuming all responsibility...i made them some copper to steel transitions using 45% blue rod....they said they would socket weld the rest...im not crazy about it.
    mikeacman

  8. #8
    Join Date
    Jun 2012
    Posts
    527
    My thoughts on this (which are not worth much haha) if it is all steel it will expand and contract at a similar rate. Steel threaded to steel would expand and contract together. Copper and steel threaded I would think that would be a good leak zone. Kind of like aluminum intake manifold on a cast block. Dont they have issues with that sometimes. If it works good this should be the new craze because steel is cheaper

  9. #9
    Join Date
    Dec 2008
    Location
    Dixiana, AL
    Posts
    2,609
    Assuming that the inside of the pipe is clean, the only thing wrong with a socket-welded steel suction line is that it will rust if not prepped and painted, and there's a lot of pressure drop thru a short radius weld 90.

    As for cost, it will offset between cost of copper and the time it takes to run weld pipe.

  10. #10
    Join Date
    Jul 2012
    Location
    Western KY
    Posts
    1,221

    Smile

    Quote Originally Posted by mikeacman View Post
    yep, they are assuming all responsibility...i made them some copper to steel transitions using 45% blue rod....they said they would socket weld the rest...im not crazy about it.
    I'm telling Troy what you did.

  11. #11
    Join Date
    Aug 2011
    Location
    Chicago
    Posts
    51
    Female copper adapter use a file to knock down ridges on male pipe thread on schedule 80 steel pipe. Use silver solder flux like pipe dope. screw in steel to copper do not over tighten. Use Silver 45 or blu rod. heat steel pipe first to tranfer heat into copper. Make braze joint. ridges knocked down on threads will allow 45 to flow. You can try all kinds of pipe dope after a year or so they will all leak due to different expansion of copper and steel.

  12. #12
    Join Date
    May 2012
    Location
    Upper Michigan
    Posts
    3,588
    Quote Originally Posted by Freightshaker View Post
    My thoughts on this (which are not worth much haha) if it is all steel it will expand and contract at a similar rate. Steel threaded to steel would expand and contract together. Copper and steel threaded I would think that would be a good leak zone. Kind of like aluminum intake manifold on a cast block. Dont they have issues with that sometimes. If it works good this should be the new craze because steel is cheaper
    Just use a fernco lol

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event