[PSUBS-MAILIST] Penetrator Welds

[James Frankland via Personal_Submersibles]

Thanks for the advice all.
Im thinking about what to do.  I might have a practice on some scrap to see
how much i can penetrate.
Many thanks
James

On Sat, 3 Jun 2023 at 00:29, Jon Wallace via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> For what its worth, Kittredge shows fillet welds on all small penetrators
> up to 2-inch diameter in the K350 plans.
>
> Jon
>
>
>
>
> On Friday, June 2, 2023 at 07:39:27 AM EDT, James Frankland via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Hi Jon
> Ive scoured ABS and i cant see anything specific about it.  Im sure its
> there somewhere, i just cant find it.
>
> Ive just re-read my email and it might have been confusing.  I do mean
> small penetrators, not large penetrations such as viewports.  Obviously
> they must be 100% pen.
>
> Anyone else got any ideas?
> Thanks
>
>
>
> On Fri, 2 Jun 2023 at 02:41, Jon Wallace via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Reviewing ABS or ASME steel vessel rules may shed some light on the
> issue.  My understanding is that anything two inches or less requires only
> fillet welds.  The rule may actually be a ratio to the hull diameter rather
> than a specific number, however I do believe your 30mm penetrator is
> perfectly safe with fillet welds.
>
> Jon
>
>
>
> On Thursday, June 1, 2023 at 09:39:45 AM EDT, James Frankland via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Hi All
>
> Any thoughts on this.  I have always thought that welds for through hull
> fittings are not required to be full penetration.  Just keep the hole as
> tight as possible to the fitting.
>
> Ive been talking to some people who say that the joints should be full pen.
>
> Obviously full pen is best, but has issues with accessibility and warping.
>
> On Jodie B i just welded all the penetrators in with a double fillet as i
> believe was shown in the plans.
>
> Gamma plans show a "mostly" full pen weld for one of their penetrators.
> See pic.
>
> I am thinking of putting a 30mm diameter penetrator through the 25mm
> conning tower base.  This is a bit of a monster to get full pen.
>
> What do you guys think?  Anyone put a penetrator through such thick
> material before?
>
> Any views on penetration of small welded fittings?
>
>
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