[PSUBS-MAILIST] Thru Hull

[Jon Wallace via Personal_Submersibles]

Brian,

According to steel vessel rules Part 4, Chapter 4,
1) assuming an 8 inch or larger diameter cylinder
2) any opening 2 inches or less in diameter does not require reinforcement

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.

Jon


On 7/11/2014 2:10 PM, Brian Cox via Personal_Submersibles wrote:
> Hi All,
>               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?
> Is this where the 100% replacement material rule of thumb come in?
>
> Thanks,
> Brian
>
>
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