Re: [PSUBS-MAILIST] Holes In Ribs?

["Sean T. Stevenson" <cast55@telus.net>]

This may seem a bit counter-intuitive, but the best place to drill holes
in stiffeners, if one must, is actually through the stiffener web. 
Stiffeners work by increasing the local moment of inertia in
consideration of the stiffener plus an effective length of the shell to
which it is welded.  The outstand (stiffener flange) actually makes the
greatest contribution to this moment, as compared to material within the
web which is close to the neutral axis of the combined section.  Small
holes are unlikely to make a huge difference, but assuming you have a T
shaped stiffener, is it possible to clamp to the flange without drilling
at all?

-Sean


On 2012-05-28 02:49, James Frankland wrote:
> Hi All,
>  
> Am i ok to drill holes in my reinforcement ribs?  They would be about
> 8mm in the top part of the "T".  Just a few here and there to hold pipes.
>  
> I've finished most of the high pressure plumbing but i need to hold
> the pipes down.  I didnt really want to drill into the ribs as it
> means more painting, but ive scraped the paint off in places while
> working so i have to re-do bits anyway.  
>  
> The other options are to weld tabs on, or use some brackets of some
> sort, but i think easiest is just to bolt through and re paint.
>  
> Thanks
> James




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