Construction lift crane operating wind speed

[WARose]

I have a heavy lift crane that will be operating on a project of mine. I have been asked to look at it to determine a safe operating wind speed. (The manufacturer refuses to provide it and OSHA regs do not (as far as I can tell) dictate it either unless you are lifting personnel. I am not lifting any people.....just load.)

Aside from my calculations on stability......does anyone know of a limiting reg by any government organization? Thanks.

 

[WARose]

[blue](CANPRO)[/blue]

Your max contact pressure may not be a result of your final lift, it could be during offloading the load from transport, or if swinging the load in place you could swing past your critical angle (for crawler cranes, likely as you swing past the toes of the tracks).

It will be off loaded away from my structure.

[blue](CANPRO)[/blue]

Another condition to consider is the no-load/full-counterweight condition with the boom all the way in (this condition can actually cause some cranes to tip over backwards).

Correct. Actually controls in this case.

[blue](racookpe1978)[/blue]

The lift will be cancelled entirely (NO load on the hook!) BECAUSE the wind is too high (above 20-25 mph) to control the load safely in midair, and to place the load accurately when it is coming down.

Ah, I got it. Hopefully these people will do the same.