Hans--
If you asked for quotes on 5/16 EHS, why did these sources send quotes on so
many other grades? EHS is the grade used by most towers.
Who made your tower and what did they say to use? "Follow the Prime
Directive" usually is good advice.
Bill--W4BSG
----- Original Message -----
From: <hanslg@aol.com>
To: <towertalk@contesting.com>
Sent: Wednesday, May 19, 2010 12:09 PM
Subject: [TowerTalk] Guy wire strength question
>
> Can anyone help me out? I am in the process of putting up a 85' tower. I
> am presently looking into guy wires. The calculated maximum force on the
> guy wires is 2990 lb. I decided that 5/16" EHS 1x7 wire should be fine.
> Now when I receive quotes I find various grades (if the quoter even knows
> what grade it is). Can somebody explain what the difference is? I see that
> EHS is recommended by most tower manufacturer but why?
>
> The strength of the different grades are mind boggling:
>
> For 5/16" galvanized steel wire I have break force for:
>
> Common Grade 3200
> Siemens Martin Grade 5350
> High strength Grade 8000
> Extra High Strength Grade 11200
> Utilities/Specification Grade 18000
>
>
> (Obviously you need to know the grade. See "Common" compared to
> "Utility").
>
> One of my questions is:" Can I use 9/32" Utilities Grade (11500 lb)
> instead of 5/16" EHS (11200 lb)? 11500 lb seems OK for a maximum expected
> force of 2990 lb (120 mph wind)? What would happen if I use 5/8" Common
> Grade (11600 lb)?
>
> Could I possible use 1/4" Utilities Grade (6000 lb) or is that to be too
> close to the maximum force (2990 lb)?
>
> Hans - N2JFS
>
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
>
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|