guy tensioner [RE-wrenches]
David Blittersdorf
davidb at nrgsystems.com
Fri Oct 12 08:55:37 PDT 2001
Kirk,
We only use turnbuckles on towers for turbines of over 1kw. We have a tensioner
available to grip the wire to help pull it tight. I have also used a "big grip" wrapped on the
cable as a pulling point. Usually in extreme loading conditions such as taking down a
tower with ice on it - not for new-bees. NRG has over 5000 towers and 20 years of
experience with the no turnbuckles - it works. The design pretension is only 200 pounds
and usually two people pulling as hard as the can gets the job done. We pretension to
70-80% of guywire strength and use turnbuckles on larger turbine towers.
Regards,
David Blittersdorf
On 10 Oct 2001 at 19:22, Kirk Herander wrote:
> Jeff,
>
> The tilt-up towers manufactured by NRG systems for Bergey machines are
> designed for use without turnbuckles, hence a tensioner might come in handy.
>
> Kirk
>
> -----Original Message-----
> From: Jeff Clearwater <clrwater at earthlink.net>
> To: RE-wrenches at topica.com <RE-wrenches at topica.com>
> Date: Wednesday, October 10, 2001 11:39 AM
> Subject: Re: guy tensioner [RE-wrenches]
>
>
> >Hi Guy,
> >
> >Perhaps I am missing something, but I have put up several wind towers
> >and cannot imagine why anyone would want guys without turnbuckles. I
> >have found that "tuning" a tower is very important to guard against
> >resonance failure and that turnbuckles are a must for this process.
> >
> >It's an easy process to install turnbuckles - all you need is a
> >come-along, some "big grips" and a few folks. They cost about $30
> >depending on cable size. Once you do, you can then tune your tower
> >in such a way that the next wind storm doesn't bring it down.
> >
> >If you go that route, (and perhaps this is the tool you are talking
> >about) you'll also need a tension gauge. I recommend the Loos
> >Tension Gauge from West Marine (the pro model). It costs about $60
> >and is well worth the investment. You can also measure tension with
> >a "resonance chart". Basically you count the freguency of the
> >standing wave you can establish by rocking the guy back and forth and
> >knowing the length and cable size and type it tells you the tension.
> >I find it good for rough adjusments but the Loos gauge takes the
> >guess work out.
> >
> >Hope that helps,
> >
> >Cheers,
> >
> >Jeff
> >
> >
> >
> >
> >>Hello,
> >>
> >>Any one out there know where I can find a tool to easily tension tower
> >>(turnbuckle-less) guy wires? I remember some in Home Power selling them,
> but
> >>can't find the issue or person's name.
> >>
> >>thanks,
> >>
> >>Kirk
> >>
> >>
> >>Vermont Solar Engineering - a Trace Certified Dealer
> >>Kirk Herander
> >>PO Box 697
> >>Burlington, VT. 05402
> >>www.vermontsolar.com
> >>800.286.1252 - 802.863.1202
> >>fax 802.863.7908
> >>
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> >
> >--
> >~~~~~~~~~~~~~~~~~~~
> >Jeff Clearwater
> >Ecovillage Design Associates
> >2525 Arapahoe Ave, Suite E4, #280
> >Boulder, CO 80302
> >Community and Village Scale Renewable Energy Systems
> >303-546-0460, clrwater at earthlink.net
> >
> >Council Member - Ecovillage Network of the Americas
> >http://www.gaia.org/secretariats/ena/
> >~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >
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>
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>
David Blittersdorf
NRG Systems, Inc.
110 Commerce Street
Hinesburg, VT 05461 USA
Tel: 802-482-2255
Fax: 802-482-2272
email: davidb at nrgsystems.com
Web:http://www.nrgsystems.com
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