An elevator, and operating equipment work in a predictable condition, and
the cables, etc., are not available for mistreatment by the well-meaning
but uninformed, or by someone in a hurry.
If you're lifting bales, rolls of paper, steel billets... in an industrial
facility, your terminal rigging is going to be abused. Cables, etc, will
wear and will fatigue.
BTW, 3 x 1 x 0.67 = 2
This equals the AISC Code, ASD, and it is what I use for "standing
rigging". Again, I use 6 for "running rigging" -- the cables that handle
the non-standard load condition, the clevises, etc. And... any lifting
gear that I design, spreader beams, lifting lugs on items that are lifted,
you name it.
If you want to become a believer, go into any large industrial facility and
watch some big lifts -- paper rolls, lifting an entire truckload of logs
with a single lift, etc. You will not stand underneath the lifted load.
Fortunately, most heavy-industrial clients are fairly sophisticated, and
recognize that it's unwise to cut corners on equipment that will shut a
facility down if it fails.
Forgive the excitement, but don't let anyone talk you into designing
something that will fail.
Fountain E. Conner, P.E.
Gulf Breeze, Fl. 32561
> From: Min Young Park <pmy1970(--nospam--at)yahoo.ca>
> To: seaint(--nospam--at)seaint.org
> Subject: Re: Lifting Devices
> Date: Saturday, March 31, 2001 1:23 AM
> If you are not able to find load factors, I think
> "allowable stress design method" can be adopted to
> this problem. According to AISC code the live load
> shall be increased up to 100% as follows.
> for supports of elevators........100%
> for supports of light machinery, shaft or motor
> ... You can find it in the code, Sect.A4.2.impact
> --- H Boge <HBOGE(--nospam--at)boge-boge.com> wrote:
> > An industrial facility is asking us to review their
> > lifting bales, hooks and other lifting devices.
> > Please advise where I can find load factors for
> > these types of elements.