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Re: Fall Protection System - Loading

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Raj,

You should contact a window wash consultant such as Ralph Mueller at ProBel in
Vancouver, B.C.  His phone # is (800) 461-0575.  The force is an ultimate
(factored) load case.  It was derived from a fall distance of an average wt.
man.  Ralph can give you the particulars.

RajSTC(--nospam--at)aol.com wrote:

> Recently, I was involved with the design of a fall protection system, for
> personnel engaged in activities on top of trucks in petroleum product loading
> rack.  I was asked to follow OSHA guidelines.  According to OSHA, "Lifelines
> shall be secured above the point of operation to an anchorage or structural
> member capable of supporting a minimum dead weight of 5,400 pounds".  Design
> based on this requirement resulted in lot of structural steel, which seems to
> me to be an overkill.  The project was on a fast track, so I could not do
> enough research before sketching the details.
>
> Now that the project is behind me (except for comments from all those
> self-styled structural engineers, like "which idiot designed this ?") I can
> get to the bottom of the design philosophy.  I am curious to know the basis
> on which OSHA came up with their recommendation.  Yes, it is a dynamic
> problem, but what assumptions or tests led to the 5,400 load?  Am I justified
> in stressing the steel members to their yield limit, considering the loading
> to be extraordinary?  Is it possible to get theoretical basis for the
> recommendation etc.  I am looking forward to some lively discussions on the
> topic.  Thanks, in advance.
>
> Raj.
>