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Forum Index : Windmills : Pipe coupling

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imsmooth

Senior Member

Joined: 07/02/2008
Location: United States
Posts: 214
Posted: 07:37pm 23 Jun 2008
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I was wondering if there are any tips on making pipe couplers. I want to join two 3" (OD)pipe. I was planning on taking the next size larger, 3.5" OD, and cutting it down its length. Then, I was going to weld some 2" x 1/4" thick plate for running some bolts through for locking it down to the pipes. Does this sound right? Is there a different way to do this? Is there a place that sells them in the USA?
 
brucedownunder2
Guru

Joined: 14/09/2005
Location: Australia
Posts: 1548
Posted: 09:22pm 23 Jun 2008
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I joined the same size pipe as you are talking about by doing the following ..

Buy a 3 feet length of the next pipe down . Drill a series of 1/2 inch holes into the larger pipe ,,tape the smaller pipe at a couple places so it's a firm fit inside the larger pipe .. Weld through the drilled holes onto the inner pipe.. now you should have half that inner sleeve pipe fixed ..
Now tape the other end of the 'stub" and slide it into the larger pipe being extended,,drill right through and bolt it.

You can now have an extension that is strong and rigid and removable..

Hope this helps.

Bruce
Bushboy
 
imsmooth

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Joined: 07/02/2008
Location: United States
Posts: 214
Posted: 10:03pm 23 Jun 2008
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Bruce, thank you for the reply. You are always very helpful. However, I was looking for a "detachable" solution so I can dissassemble the tower if needed. It is easier to move 20' pipe instead of 35' or 40'. I have see a solution using the one-size-smaller pipe, and bolting it to the larger pipe. I am worried that the smaller pipe (2" nominal) will bend; and, for this reason, I want to use a larger size pipe with a larger area moment of inertia.
 
GWatPE

Senior Member

Joined: 01/09/2006
Location: Australia
Posts: 2127
Posted: 11:02pm 23 Jun 2008
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  brucedownunder2 said   drill right through and bolt it.

You can now have an extension that is strong and rigid and removable..


Hi IM,

Bruce has quite accurately described a joint that is strong and disassemblable.

One length will be 0.5m or about longer only.

I would seek assistance by a professional steel construction engineer, if the description Bruce gave needs an explanation. Gordon.

become more energy aware
 
imsmooth

Senior Member

Joined: 07/02/2008
Location: United States
Posts: 214
Posted: 12:11am 24 Jun 2008
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I see. I misread the first time thinking I was welding to both sides: I'm just welding one end in to create the stub, and bolting the other side.

Thanks
 
martinjsto

Senior Member

Joined: 09/10/2007
Location: Australia
Posts: 149
Posted: 09:51am 27 Jun 2008
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hi m8,
have you thought about the scaffolding clamps, just an idear
martin
free power for all
McAlinden WA
 
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