Guy Wires tension
Guy Wires tension
(OP)
I don't know if this is the correct forum.
My question is: Does anybody know if there is some international Standard stablishing the correct tension for a guy wire?
I'm talking of a flare stack supported by for guy wires for stability.
I'm looking for something like "...10% of the nominal strengh..." or similar.
Thanks in advance
Daniel
My question is: Does anybody know if there is some international Standard stablishing the correct tension for a guy wire?
I'm talking of a flare stack supported by for guy wires for stability.
I'm looking for something like "...10% of the nominal strengh..." or similar.
Thanks in advance
Daniel






RE: Guy Wires tension
RE: Guy Wires tension
You wouldn't want to exceed the design forces used for the stack or guy anchor designs.
RE: Guy Wires tension
When you factor in the lateral loads resisted by the guy wire, which is highly variable, coupled with the size of the wire, grade, connections, plumbing (as in maintaining a vertical attitude) considerations, etc...
It seems to me the pretension force applied needs to be included in the forces seen and the SF applied on the appropriate combination of forces, including that force.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Guy Wires tension
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Guy Wires tension
The four 35 mm diameter and ten meter long guy wires have been there for almost thirty years.
I bought like for like replacement wires. I know the nominal tension for the new ones, but the question is...shall I tension them hard as a guitar string...shall I leave them loose...shall I ask in this forum...
I'm looking for the simplest and most practical answer.
Paddington you talk about 30% how did you get to that figure? Just guess? Did you find it written anywhere?
Thank you very much for your answers
Daniel
RE: Guy Wires tension
RE: Guy Wires tension
That was what we used for transmission and distribution design. However, I did the web search that you should have done in the first place and came up with this:
http://www.usbr.gov/ssle/safety/RSHS/appD.pdf
It has some standards listed (section 3) as well as the "normal" safety factors.
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Guy Wires tension
Somewhere in your building archives, there could be a set of building plans with the engineering detailing preloading force on the existing guy cables. You could also do your own analysis which is ot that complicated if you do engineering calculations.
RE: Guy Wires tension
I'll read carefully this appendice you linked.
JStephen your point is clear, thanks.
The rest of you thanks, you've all been helpful
RE: Guy Wires tension
You have indicated by your comments that you are probably not a structural engineer.
It is important that you realise the delicacy of this situation. If you tighten up the guys too much then you may cause a compression failure in the stack, if you tichten them up too little then the stack will deflect too much which could cause fatigue failure.
Best to get an experienced consultant to come in and look at this before you simply replace like for like.
Will it be adequate to current code? It may need to be brought up to current or seismic codes.
What is the condition of the stack?
How will you safely swap over the wires?
This is a far more complex issue than it appears on the surface.
RE: Guy Wires tension
I might add - If you tighten one side more than the others.....bad things can happen
RE: Guy Wires tension
BA
RE: Guy Wires tension
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RE: Guy Wires tension
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Guy Wires tension