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[TowerTalk] Opinions on U.S. Towers Tubulars

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Subject: [TowerTalk] Opinions on U.S. Towers Tubulars
From: (Bill Hinkle)
Date: Sat, 31 May 1997 21:15:27 PST
Better check out Tri-Ex's specs.......... They use 70mph.
                                    Bill, KB3AUG

On Sat, 31 May 1997 17:18:13 -0700 (PDT) (Stan Griffiths) 
>>>     Since you asked, most times obtaining a building permit entails 
>>>stamped PE drawings in your document package.
>>That's the way it is around here.
>>> Crank-ups are mostly rated at 50 MPH
>>>where the minimum TIA-222 wind speed is 70 MPH. UBC and other 
>>>codes are generally in the same ballpark. Also, the crank-up 
>drawings are
>>>only PE stamped in their state of manufacture; you need a local PE 
>to stamp
>>>your local drawings. 
>  In our county it doesn't
>>matter, you still need the signed calcs no matter what kind of tower. 
> Also I
>>would think that since PEs are licensed by the states, and many 
>states do not
>>accept work from out-of-state PEs that this would be the same 
>problem, no
>>matter what kind of tower you are putting up.  It would be out here.  
>Am I
>>missing something?
>The thing that is different about crankups is that they are the ONLY 
>type of
>tower I have ever seen advertised or speced for windspeeds of only 50 
>I think the reason is obvious:  If you really speced them for the 
>winds they
>will actually experience, they are too weak to hold up much of an 
>with any safety factor at all.  If the manufacturers speced them
>conservatively, they wouldn't sell any of them.
>FAQ on WWW:     
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