[TowerTalk] 2 inch Mast versus schedule 80 pipe?

[Roger (K8RI) on TT]

On 8/19/2013 9:58 PM, GARY HUBER wrote:
> Environment:  50 foot AGL Rohn 45G flat top bracketed @ 23 feet, T2X TailTwister  on  Rohn rotor shelf,  Rohn 2 inch bearing, Hy-Gain TH-7 1 – 2 feet above bearing, with boom support (3 feet above boom).
>
> I’ve had a ten foot section of 2 inch schedule 40 galvanized pipe in  a similar (tapered top – exception) environment for close to thirty years. I’m now getting ready to replace the existing tower with new, cables, rotor, antenna, etc.  Maximum intended life of the new installation: No more than 15 years

2" DOM is far stronger and resistant to bending than schedule 40 pipe.

DOM Characteristics: http://www.speedymetals.com/information/material17.html

I use 24' sections with end caps of 1/4" steel welded in place and 
machined flat.  I use an 18" section of 2 1/2" as a splice with 6 SS cap 
screws on each end.

73

Roger (K8RI)


> c
>
> Thus far I have not found a source with specifications of 2 inch mast tube and have been looking at galvanized pipe again, either schedule 40 or schedule 80.  I took a S.W.A.G. the last time and was fresh from working at a steam power plant where we worked with pipes daily. That knowledge is gone; anyone have any suggestions or recommendations for a rotor mast carrying 75 pounds, 12 sq feet, and 240 pound wind load at 80 MPH? tube or pipe, sched 40 or sched 80, where to buy?
>
> Best regards,
>
> CSM(r) Gary L Huber – AB9M
> 9679 Heron Bay Road
> Bloomington, IL 61705
>
> WWW.CSM-GH.COM
> glhuber at msn.com
> 309-662-0604
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