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RE: [PSUBS-MAILIST] Store Front and Product Survey

To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] Store Front and Product Survey
From: irox <irox@ix.netcom.com>
Date: Thu, 6 Mar 2008 21:09:08 -0500 (EST)
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Reply-to: personal_submersibles@psubs.org
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I think you are correct.  At least those are the issues I'm
concerned about.  Avoiding the ring snapping (oh dear that
would be bad), or the stress on the outer (vertical part
of the L cross section) causing the inner (horizontal part
of the L cross section) surface to deform and cause stress
points on the Acryilic.

If you find it in your book, let me know which book you are
using and I'll buy a copy.

Over the years I've spend so much on books and standards, and
still don't feel I have a complete library by an stretch.
Even if it was kind of expensive, being able to buy these
in a bundle (or something, maybe a series) would have been
very useful and probably saved me money.

Cheers,
  Ian.

-----Original Message-----
>From: "Sean T. Stevenson" <cast55@telus.net>
>Sent: Mar 6, 2008 8:23 PM
>To: personal_submersibles@psubs.org
>Subject: RE: [PSUBS-MAILIST] Store Front and Product Survey
>
>In the case of a circular window seat, the "structural requirements" would be
>based on a simple beam calculation, would it not?  Design for required factor of
>safety for shear and bending moment, using the worst case scenario of shear area
>at minimum radius of seat (i..e window bows inward and all load is on the inside
>edge of the seat), and bending moment about maximum radius of seat assuming a
>point load at the minimum radius.  Also consider stress concentration at the
>corner (outside radius of seat).
>
>I'll dig through my books when I get home and see if there is any relevant info.
>
>-Sean
>
>
>Quoting irox <irox@ix.netcom.com>:
>
>> 
>> Hi Sean,
>> 
>> I have ASME PVHO-1-2002 here, it pretty much just reprints what's in
>> the Stachiw book, although I find it a little easier reading (mmmmm,
>> much shorter, bigger pictures).  But the values I'm looking for are
>> listed as "selected on the basis of structural requirements".  I think
>> maybe there is another pressure vessel standards (non-HO maybe?) which
>> contains this information.
>> 
>> So, the PVHO books I have are:
>> 
>> ASME PVHO-1-2002: Safety Standard for Pressure Vessels for
>> Human Occupancy.
>> 
>> and
>> 
>> ASME PVHO-2-2003: Safety standard for pressure vessels for
>> human occupancy in-service guidelines for PVHO Acrylic Windows.
>> 
>> Are they any others I should add to my collection?
>> 
>> Cheers,
>>   Ian.
>> 
>> -----Original Message-----
>> >From: "Sean T. Stevenson" <cast55@telus.net>
>> >Sent: Mar 6, 2008 6:41 PM
>> >To: personal_submersibles@psubs.org
>> >Subject: RE: [PSUBS-MAILIST] Store Front and Product Survey
>> >
>> >I don't have the book handy to check, but isn't that covered in ASME
>> PVHO-1?
>> >
>> >-Sean
>> >
>> >
>> >Quoting irox <irox@ix.netcom.com>:
>> >
>> >> 
>> >> Hi Jon,
>> >> 
>> >> yes, I think we are talking about the same thing, the metal the
>> >> acrylic is mounted in.  I am using the Stachiw book, but it has
>> >> gaps in about the viewport housings/thru-hull mounts.  Things like
>> >> "K is selected on the basis of structural analysis" (where K is
>> >> some value I want to know), but no other information obtaining
>> >> or estimating K.
>> >> 
>> >> I'm currently researching spherical sector viewports with a
>> >> square edge.  The lip (side wall) of the viewport housing/thru-hull
>> >> will take part of the pressure of the viewport, as well as the
>> >> flat, contact surface.  (For flat viewports, the flat contact
>> >> surface takes all the pressure and not the lip, which is
>> >> just used to keep the viewport in place and for attaching the
>> >> retaining ring).  I cannot find information in the Stachiw
>> >> book about how thick the lip needs to be.
>> >> 
>> >> I plan to over build, but I'd like to know by how much I'm
>> >> over building.
>> >> 
>> >> Cheers,
>> >>   Ian.
>> >
>> >
>> >
>> >
>> >
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