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Brian,<br>
<br>
According to steel vessel rules Part 4, Chapter 4, <br>
1) assuming an 8 inch or larger diameter cylinder<br>
2) any opening 2 inches or less in diameter does not require
reinforcement<br>
<br>
So for a 1/2 inch diameter valve you can cut a hole in the
pressure shell and weld the valve in directly. If you want to put
the valve through the stainless round stock for some reason, the
thickness of the stainless doesn't matter as long as it is at
least equal to the thickness of the hull.<br>
<br>
Jon<br>
<br>
<br>
On 7/11/2014 2:10 PM, Brian Cox via Personal_Submersibles wrote:<br>
</div>
<blockquote cite="mid:20140711111045.19208BCA@m0005297.ppops.net"
type="cite">
<div style="font-family:Arial, sans-serif; font-size:10pt;">
<div>Hi All,</div>
<div> Have a question on thru hull fittings . Is
there a minimum thickness that they need to be? Say if I had
a 1/2" shaft going thru stainless round stock of 1 1/2" for a
external valve, how much thicker that the hull does that need
to be?</div>
<div> </div>
<div>Is this where the 100% replacement material rule of thumb
come in?</div>
<div><br>
Thanks,</div>
<div> </div>
<div>Brian</div>
</div>
<br>
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