[PSUBS-MAILIST] K-250 dome advice

[Jon Wallace via Personal_Submersibles]

 I'm surprised to hear that because like I said, I know they manufactured one for Brian Hughes and I believe that was a typical 24 diameter, 12 inch height hemisphere.  I believe the K250 dome uses 1-inch thickness plexiglass.  Is that what they quoted you?  Did they perhaps quote thinner stock that would have caused a problem at the apex at 12 inch height?
Jon

    On Monday, April 18, 2022, 01:23:09 PM EDT, 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
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