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Re: [PSUBS-MAILIST] PSUB Fatalities...View Ports...Shatterproof
Hi Paul,
The company I work for, manufactures a hardcoat for transparencies that is cured
using UV light. This coating is extremely durable and even matches the index of
refraction. The tricky part is getting full exposure of the part surface.
Take care,
Ken Schulze
Paul Suds wrote:
> Richard, I got your e-mail (below) and I thank you for responding, but for a
> design pressure of 60 ft, 1/2 inch to 3/4 inch polycarbonate is way over
> design. I also realize that "round symmetry" works best with pressure, but
> actually spherical symmetry works even better than that. The canopy that I'm
> designing is round, but in some places, it's actually more spherical than it
> is round. Canopies are typically round anyway, aren't they? what type of
> canopy did you imagine I was going to build? As far as reading books on
> plastics, I think I've read a few. I've also designed lots of products and
> injection molds, blow molds, transfer molds etc., for PE,PVC,PP,PS,PMMA,
> PA,PEEK,ABS, to name a few. I haven't read the code that you are refering
> to, but I certainly will. Thanks. WOW, you actually tested your view ports
> to 3280 ft? Lab hydro no doubt. And yes, maybe if I were taking my sub down
> beyond 1000ft, I may consider PMMA, but around reefs and other protrusions,
> UV stabalized, scratch resistant polycarbonate can't be beat, especially
> 1/2" to 3/4"!
> Again, good discussion on this. I would welcome any valid information to the
> contrary that in low depth, low pressure situations, polycarbonate is not
> the plastic of choice. Finally, I intend on testing my canopy to several
> hundred feet. I'm more concerned with the sealing surface though, than I am
> with the strength and properties of the PC.
> Suds
>
> You wrote:
>
> Paul,
>
> Paul, you need to read some books on the subject and this will turn the
> lights on as far as viewport design and fabrication go.
>
> Also you might want to read the archives back about a year and read what
> Gary Boucher had to say about viewports.
>
> Also look up the ASME PVHO-1 code there is also quite a bit about viewports
> in there.
>
> The canopy concept is not a structurally sound one for a one-atmosphere
> manned submersible, round symmetry works best with pressure.
>
> The material you should work with is acrylic, nothing else is safe according
> to code.
>
> The only way to test viewports is under hydrostatic pressure, nothing else
> will do. I tested a few of my viewports a while back and had good results
> down to 3280'.
>
> Richard Hess
>
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