[PSUBS-MAILIST] Penetrator Welds

[Alec Smyth via Personal_Submersibles]

Hi James,

I've always applied the same rule, forgoing full penetration for things
that are no larger than 2", but I'm afraid I can't recall where I got that
rule!

Best,
Alec

On Fri, Jun 2, 2023 at 7:38 AM 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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