[PSUBS-MAILIST] Penetrator Welds

[Antoine Delafargue via Personal_Submersibles]

Hello James
Pretty sure it should be full pen in most rules.

But if the location of your hole in the conning tower does not contribute
to the structural reinforcement of the opening that your conning tower is
making in the hull’s main cylinder,
(Ie is far enough from the hull’s main cylinder),

Then you may just thread your hole and just insert a male threaded tapered
through hull into it with some loctite but without any extra weld.
I did exactly that on Pilot Fish for the ballast purge valve controls.

Regards
Antoine

Le ven. 2 juin 2023 à 13:38, James Frankland via Personal_Submersibles <
personal_submersibles at psubs.org> a écrit :

> 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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