[TowerTalk] Need European spec for Chrome moly tube

[Roger (K8RI)]

John Barry wrote:
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> Folks,
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> Last winter, I had a stack of a 40m full size beam and a tribander wiped out
> by a storm. The point of failure was the steel tube that I was using which
> bent over and caused a knock on affect which destroyed the beams. We have
> learn the difference between pipe and tube the hard way.
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Its been my experience that in general pipe is heavier, not as strong as 
structural tubing, and bends easier.
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You might also check into DOM or "Drawn Over Mandrel" tube with a 1/4" 
wall. It comes in various sizes, wall thickness,  and strengths but I 
don't know how you would find it listed on that side of the pond. DOM 
runs about 3X the price of  structural tube, but is considerably cheaper 
than Chrome Moly tube.

That's about all the info I can come up with.

73 and good luck,

Roger (K8RI)
> There are several steel stockists here in Ireland, but they only carry
> standard galvanised piping. I have checked the towertalk archives and there
> is a lot of discussion there on the merits of Chrome-moly tubing and the
> different grades that would be suitable for this type of installation.
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> However, these seem to be US standards and the steel merchants here are not
> familiar with them.
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> Can anyone point me in the right direction ? If someone has purchased tubing
> for a similar project, I would be very grateful if you could send on details
> of what tubing you have used.
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> Regards
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> John ei8ir 
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> For EI7M Group
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