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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