30 years for a Galvanized tower
tower here is well over 35 years
as good as new
remember the "todays" cost factor!
> From: Bill Hider <firstname.lastname@example.org>
> To: Paul van der Eijk <email@example.com>
> Cc: 'firstname.lastname@example.org'
> Subject: Re: [TowerTalk] tower damage / insurance question
> Date: Thursday, May 01, 1997 3:17 AM
> Paul van der Eijk wrote:
> > My tower was damaged by a truck delivering gravel (one guy and
> > 2m antenna in the top.) Their insurance wants to prorate the years I
> > owned the tower over the useful live of the installation. I'm not sure
> > this is acceptable, but if I have to make the choice, what would be the
> > useful live of the installation?
> > Tower is 90ft Rohn 45, guyed by a mix of phillystran and steel cable.
> > 73 Paul KK4HD
> > --
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> What they are doing is "depreciating" your installation. This is a
> typical insurance procedure and is quite logical. You have already used
> the portion the useful life prior to the accident and the company who
> caused your installation to fail is responsible only for that portion of
> the useful life AFTER the accident. At the end of the useful life you
> will have to pay for improvements to extend the useful life. The
> accident causer is not responsible for this either. That's the logic.
> Now to your question. I obtained a chart depicting the useful life of
> the galvanizing of a steel tower under various environmental conditions
> (eg, urban, sea coast, residential, industrial, etc). That chart
> identified the useful life in terms of the amount of galvanizing
> remaining on the tower and defined end of life when there was 95% of the
> galvanizing remaining, ie, 5% rust.
> As I recall (I don't have the chart in front of me), in an urban,
> non-corrosive environment, the useful life was 30-35 years.
> The chart is probably available from the American Galvanizers
> Association. Their web site is: http://usalink.net/aga/
> Hope this helps.
> Bill, N3RR@EROLS.COM
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