On 12/18/2011 8:35 PM, Al Kozakiewicz wrote:
>
>
> -----Original Message-----
> From: towertalk-bounces@contesting.com
> [mailto:towertalk-bounces@contesting.com] On Behalf Of Larry WA9VRH
> Sent: Sunday, December 18, 2011 7:33 PM
> To: towertalk@contesting.com
> Subject: Re: [TowerTalk] Tower identity
>
>> HI Rob and all,
>> FYI the Rohn HBX towers are assembled with aluminum rivets. If you have one
>> regalvanized the rivets will melt and you will have a bunch of loose pieces.
>> (so I am told)
> Maybe. Zinc melts at about 787F and hot dip galvanizing baths are around
> 850F. Aluminum melts at 1200F, though I am sure that if the rivets are heat
> treated it's possible they would lose some strength properties at galvanizing
> temperatures.
I would be far more concerned about the acid removing them before they
ever reach the galvanizing tank. <:-))
>
> I don't know about the HBX, but most Rohn tower sections aren't so expensive
> that regalvanizing, IMO, makes much economic sense even if you value your
> time at nothing. I certainly wouldn't hot dip anything that's assembled with
> fasteners (no matter what the material) without removing them first and
> replacing them after.
>
> Put another way, if the structure pieces are so badly worn as to require
> regalvanizing, should't they be replaced?
Unless a person has the equipment and knowledge to measure the the leg
thickness and interior condition how do they know what they are
regalvanizing is safe?
That, to me, raises the question, "How does hot dip galvanizing become
worn to the point where it needs replacing?" How it became worn might
be more important than it needing to be regalvanized.
73
Roger (K8RI)
>
> Al
> AB2ZY
>
>
>
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