Miller Electric

Welding Discussion Forums

Home » Resources » Communities » Welding Discussion Forums
 
Miller Welding Discussion Forums - Powered by vBulletin

Page 1 of 2 12 LastLast
Results 1 to 10 of 13
  1. #1
    Join Date
    Aug 2009
    Location
    Wylie, Texas
    Posts
    39

    Default square tubing for pipe fence???

    Hi guys,

    I want to do a pipe fence using square tubing. I wan to use 2 1/2" tubing for the line posts.

    My question:
    Would 11 gauge tubing be sufficient?
    If so, would using 2 1/2" --- 3/16" thickness work for the corner/end posts or should I go with something bigger?

    The fence is 6 feet tall with posts set 3 feet into ground using concrete. The posts will be set 8 foot apart with a top (into the side of the post not running along the top) and a bottom rail. I will put no-climb horse fence on it. It is to keep 2 very large livestock guardian dogs in and maybe horses later.

    Thanks for any help.
    Ford F350
    John Deere 510D Backhoe
    Titan Industrial Gas Air Compressor
    JD-Tech 5500 Diesel Generator
    Millermatic 211
    Hypertherm Powermax 45

  2. #2

    Default

    Based on some numbers I found for modulus and moment of inertia it looks to me like the 11 ga is comparable to a 4x4 fir post and the 3/16 wall is stronger but not even close to a 6x6 fir post.

    The spreaders will add strength to the corners for holding the tension on the fence. You didn't say what the spreaders would be made of but without spreaders you would be pushing those corners pretty hard if there were 500 pounds of tension on each side. Maybe with the top and bottom rails you aren't planning on very much tension.

    That fence would probably be fine for horses, but not buffalo.

    The other concern would be rust or filling with water and freezing, at least up here in Minnesota.

  3. #3
    Join Date
    Aug 2009
    Location
    Wylie, Texas
    Posts
    39

    Default

    Quote Originally Posted by FernTJ View Post
    Based on some numbers I found for modulus and moment of inertia it looks to me like the 11 ga is comparable to a 4x4 fir post and the 3/16 wall is stronger but not even close to a 6x6 fir post.

    The spreaders will add strength to the corners for holding the tension on the fence. You didn't say what the spreaders would be made of but without spreaders you would be pushing those corners pretty hard if there were 500 pounds of tension on each side. Maybe with the top and bottom rails you aren't planning on very much tension.

    That fence would probably be fine for horses, but not buffalo.

    The other concern would be rust or filling with water and freezing, at least up here in Minnesota.
    Thanks
    Ford F350
    John Deere 510D Backhoe
    Titan Industrial Gas Air Compressor
    JD-Tech 5500 Diesel Generator
    Millermatic 211
    Hypertherm Powermax 45

  4. #4
    Join Date
    Oct 2007
    Location
    Cave Creek Az
    Posts
    1,011

    Default

    Sounds fine to me.

  5. #5
    Join Date
    Oct 2012
    Location
    Neosho Mo
    Posts
    75

    Default

    The 11 gauge 2 1/2 tubing will work for what you're going to do I believe but on the stretch/corner posts I would up size the post to 4 inch tubing. The 2 1/2 3/16 will probably work but past experience makes me suggest 4 inch. Plus it looks slicker.

  6. #6
    Join Date
    Aug 2009
    Location
    Wylie, Texas
    Posts
    39

    Default

    Quote Originally Posted by fencemaker View Post
    The 11 gauge 2 1/2 tubing will work for what you're going to do I believe but on the stretch/corner posts I would up size the post to 4 inch tubing. The 2 1/2 3/16 will probably work but past experience makes me suggest 4 inch. Plus it looks slicker.
    Thanks for the thoughts
    Ford F350
    John Deere 510D Backhoe
    Titan Industrial Gas Air Compressor
    JD-Tech 5500 Diesel Generator
    Millermatic 211
    Hypertherm Powermax 45

  7. #7
    Join Date
    Sep 2012
    Location
    AZ
    Posts
    52

    Default Force Required to Bend the Tube

    Quote Originally Posted by aneuploidy View Post
    Hi guys,

    I want to do a pipe fence using square tubing. I wan to use 2 1/2" tubing for the line posts.

    My question:
    Would 11 gauge tubing be sufficient?
    If so, would using 2 1/2" --- 3/16" thickness work for the corner/end posts or should I go with something bigger?

    The fence is 6 feet tall with posts set 3 feet into ground using concrete. The posts will be set 8 foot apart with a top (into the side of the post not running along the top) and a bottom rail. I will put no-climb horse fence on it. It is to keep 2 very large livestock guardian dogs in and maybe horses later.

    Thanks for any help.
    The worst case in bending is where you have a single 6' high pole embedded in the ground and you applied a horizontal force at the top to bend it. The force required for a 2 1/2" 11 g square tube to yield in bending is 435 lbs. For 2 1/2" 3/16" tube the force is 628 lbs. And for a 4" 3/16 tube the force is 1750 lbs.

  8. #8
    Join Date
    Oct 2006
    Location
    Illinois
    Posts
    602

    Default

    I would say you are fine. What ever you decide on I would span upon material length. So if you are buying 20' lengths go on 10' centers to minimize waste. If you feel the span is to great , add 1/4'' x 2 ''or 3'' flat stock vertical in between. My pig pens are 2'' square tube uprights, 1 1/4'' pipe horizontal, 12' span and 1/4''x 2''flat stock vertical in center of span. Never had a problem with 800 pound boar and 500 pound sows. With material costs I always try to design for minimum waste.

  9. #9
    Join Date
    Aug 2009
    Location
    Wylie, Texas
    Posts
    39

    Default

    Quote Originally Posted by BD1 View Post
    I would say you are fine. What ever you decide on I would span upon material length. So if you are buying 20' lengths go on 10' centers to minimize waste. If you feel the span is to great , add 1/4'' x 2 ''or 3'' flat stock vertical in between. My pig pens are 2'' square tube uprights, 1 1/4'' pipe horizontal, 12' span and 1/4''x 2''flat stock vertical in center of span. Never had a problem with 800 pound boar and 500 pound sows. With material costs I always try to design for minimum waste.
    Thanks. By vertical, do you mean running the 1/4" x 3" from top to bottom rail?
    Thanks again for the advice
    Ford F350
    John Deere 510D Backhoe
    Titan Industrial Gas Air Compressor
    JD-Tech 5500 Diesel Generator
    Millermatic 211
    Hypertherm Powermax 45

  10. #10
    Join Date
    Aug 2009
    Location
    Wylie, Texas
    Posts
    39

    Default

    Quote Originally Posted by Arizona Joe View Post
    The worst case in bending is where you have a single 6' high pole embedded in the ground and you applied a horizontal force at the top to bend it. The force required for a 2 1/2" 11 g square tube to yield in bending is 435 lbs. For 2 1/2" 3/16" tube the force is 628 lbs. And for a 4" 3/16 tube the force is 1750 lbs.
    Thanks. So it looks like you get much stronger by going up in diameter. Is there a chart that has those figures or did you have to calculate them. I ended up buying 3" 11 gauge for the line posts and 3" 3/16 for the end/ corner posts.
    Thanks again
    Ford F350
    John Deere 510D Backhoe
    Titan Industrial Gas Air Compressor
    JD-Tech 5500 Diesel Generator
    Millermatic 211
    Hypertherm Powermax 45

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Warning: Function split() is deprecated in /mnt/stor3-wc1-dfw1/357822/357839/www.millerwelds.com/web/content/lib/footer.inc.php on line 82

Welding Projects

Special Offers: See the latest Miller deals and promotions.