Using polycarbonate would be either too risky (very little data)
or too expensive (cost for the safety research) when compared
to Acrylic. Much research has been done on Acrylic and it's
relatively cheap be buy the findings. Even if polycarbonate
had the same amount of data avaliable, I would still choose
Acrylic because it will turn milky long before failing, where
as polycarbonate would fail without warning.
Cheers,
Ian.
On Wed, 07 Feb 2007 06:30:34 -0800
"Brent Hartwig" <brenthartwig@hotmail.com> wrote:
Fantastic, It's nice to know we have good options. Are these view
ports just the glass or the glass and the metal framework? I'm thinking I
might like to use polycarbonate for a number of reasons. But I need to do
a list of pros and cons compared to acrylic. There is a number of
different brands and types in those brands that most have different
advantages to compare as well. It's like going to school. So you could
say I need to be schooled. : )'
Brent
------------------------------------------------
From: "Jon Wallace" <jon@psubs.org>
Reply-To: personal_submersibles@psubs.org
To: <personal_submersibles@psubs.org>
Subject: RE: [PSUBS-MAILIST] Great Update on the old K-250 sub in
Sandpoint
Date: Wed, 7 Feb 2007 08:00:29 -0500
Hi Brent,
I'm currently in talks with a manufacturer of certified ASME PVHO view
ports to offer these through PSUBS. I have no idea what they would cost,
but it's an option you might consider if you choose to replace the view
ports.
Jon
-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org]On Behalf Of Brent Hartwig
Sent: Wednesday, February 07, 2007 3:19 AM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Great Update on the old K-250 sub in
Sandpoint
Great data Ian, thank you much. As I recall the scratches were really
light so we will see what we got once we have them out. I didn't think
about them soaking up water,interesting. I used to know allot more about
annealing when I was working on designs for small animal enclosures, but
I'll have to dig that data out of my brain and filing cabinet and
refresh. The two small view ports have a large bevel on them that would
require turning them on a lathe if we need to make new ones. Having the
old ones will make it easier to copy them. I have a lathe that should be
able to do this for us. The basic circle can be water jet cut out of the
sqare sheets here locally very quickly and for a good price.
Regards,
Brent
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