[AT] O.T. pipe size

[charlie hill]

Don,  1 1/2" (nominal size) steel pipe measures 1.90" outside diameter.   It 
comes in several different wall thicknesses.  Schedule 40 is generally 
considered standard size.  Schedule 40 has a wall thickness of .145"  so 
that would give you an inside diameter of
1.90 - (.145 x 2)= 1.90" - .290 = 1.61" inside diameter.    You said 1 5/8 
which is 1.625 so if you can't live with that extra 15/1000ths.
you would need to go to schedule 10 pipe which has a wall of .109.  That 
would give you just over 1 5/8" inside.

To get the schedule 10 pipe you'll need to call an industrial piping 
supplier.  The cheapest should be what is called ERW pipe which stands for 
electric resistance welded, meaning it has a weld seam down it and is made 
by rolling a flat bar into a tube and welding the edge.
If you are looking for cheap you want 1 1/2" Sch. 10 black iron ERW pipe. 
Verify what I told you with the pipe supplier.  It will come in 21' lengths 
most likely and will not be threaded on the ends.

If you don't have a pipe supplier nearby try looking online at McMaster 
Carr.  They'll ship it to you.  If you get it motor freight the freight 
might not be too bad.

Hope this helps.    If those numbers don't work out for you look on McMaster 
Carr's web site at "structural tubing".  It looks like pipe to the untrained 
eye but tubing is made to be machined and is perfectly round or at least 
more perfectly round than pipe.  They should have that in exactly 2" with a 
variety of wall thicknesses but it's been a long time since I bought any so 
I could be wrong.

-----Original Message----- 
From: Don Bowen
Sent: Friday, July 20, 2012 5:31 PM
To: Antique tractor email discussion group
Subject: [AT] O.T. pipe size

I need a section of pipe or tubing with an O.D. not greater than 2" with
an I.D. a little greater than 1 5/8".  This is for an Amateur Radio
tower.  The tubing between the antenna and rotator is 1 5/8". The peak
of the tower has a ring with a 2" I.D. and another about 2' down from
the peak.   A short piece of the unknown sized pipe/tubing will be
mounted between the rings and extending a little above the peak.  A
thrust bearing will be mounted at the top with the 1 5/8 passing through
and held by the bearing.

-- 
Don Bowen           KI6DIU
http://www.braingarage.com/Dons/Travels/journal/Journal.html

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