[PSUBS-MAILIST] Penetrator Welds

[James Frankland via Personal_Submersibles]

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?
>
>
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20230602/633fc255/attachment.html>