[PSUBS-MAILIST] K-250 dome advice

[Alec Smyth via Personal_Submersibles]

I can run those numbers for you Phillippe, but I can't imagine a 9" dome
being very usable ergonomically. If no other supplier can be found, I would
suggest an acrylic cylinder on the hatch land, with a steel hatch on top of
that. Or even a steel CT extension with flat viewports in it.

Precision is where Greg Cottrell used to work, and he had no trouble making
full sized domes. I hope the fact they can no longer make them doesn't
indicate that the loss of Greg's expertise brings potential quality issues
we (indeed they) don't know about.

Best,
Alec

On Mon, Apr 18, 2022 at 1:22 PM Philippe Robert via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> The maker for my dome is Precision Plastics. I have a seat in my pressure
> hull on the VBT and with a dome of  9in height only 3 inch left to my head.
> What is the title of your Stachiw book ?
>
> Regards
>
> Le lun. 18 avr. 2022 à 10:24, Jon Wallace via Personal_Submersibles <
> personal_submersibles at psubs.org> a écrit :
>
>> Have you tried Precision Plastics in Maryland USA?  They made a dome to
>> specs for Brian Hughes.
>>
>> The answer to your question is yes, but I don't have my Stachiw book with
>> me to see what the actual rating would be.  You can ask someone else on the
>> list to check their Stachiw book, or I will be back home around the 24th
>> and can check my book when I return.  You obviously will have less head
>> room with a 9-inch depth.  You also have to make sure that they anneal the
>> dome according to ASME standards or it may fail prematurely.
>>
>> Jon
>>
>>
>> On Monday, April 18, 2022, 09:58:33 AM EDT, Philippe Robert via
>> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>
>>
>> Hi All,
>>
>> I have an issue in the making of my k-250 dome. I asked for advice from
>> some members in the past and now I have a new problem. The company that
>> makes my dome cannot blow the dome to the specs (12 in height 24 in wide).
>> So the max height that is acceptable is 9in to avoid the dome breaking when
>> it is formed. So my question is ,is it acceptable to have a smaller height
>> and I was wondering if the pressure rating  of the dome will be ok.
>>
>> Thanks
>>
>> Philippe
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