In a message dated 96-12-15 22:45:06 EST, you write:
>I'm planning to erect 66 ft of rohn 25 to use with a Hazer. With this
>height I'll need two sets of guys and the lower set will of course need to
>come off to allow the Hazer to pass. I want to minimize the difficulty of
>dropping these guys so looking for suggestions on how to attach.
>
>Best I've come up with is to use the carribiners that screw closed, but the
>ratings are less than I would expect (or feel confortable with).
>
Hi, Mark --
Rohn 25G typically requires 3/16 inch EHS guy wire which is rated at
3990 pounds breaking strength and should be tenisoned at 10% of ultimate
breaking strength, or approximately 400 pounds. (Use of a Loos guy wire
tensioner will result in accurate tension.) A locking carabiner such as the
ones sold by TOWER TECH are rated at 25 kN or 5625 pounds. While not
normally used in this kind of application, the rating shows a comfortable
safety margin for your installation. A more common rigging device would be a
clevis, or shackle, to do the same thing. These are usually available at
your local hardware store. The main thing is to make sure that the ultimate
breaking strength and safe working load are compatible with your
installation. It doesn't hurt to over-engineer things either.
73, Steve K7LXC
TOWER TECH -- professional tower supplies and services for amateurs
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