[PSUBS-MAILIST] Acrylic temperature rating

[Alan James]

Thanks,
that's hot. I read it gets up to 32 Celsius at the surface
in the Persian gulf.
Alan


________________________________
 From: "vbra676539 at aol.com" <vbra676539 at aol.com>
To: personal_submersibles at psubs.org 
Sent: Tuesday, December 10, 2013 4:24 PM
Subject: Re: [PSUBS-MAILIST] Acrylic temperature rating
 


Abu Musa offshore Sharjah in the UAE. 84F/29C at 200 feet! Like diving in a hot tub. Even the sharks were sweating, which didn't make our recovery diver very happy. 
Vance



-----Original Message-----
From: Alan James <alanlindsayjames at yahoo.com>
To: psubs.org <personal_submersibles at psubs.org>
Sent: Mon, Dec 9, 2013 9:56 pm
Subject: [PSUBS-MAILIST] Acrylic temperature rating


Just something interesting I found in G.L. with regard to depth
rating of acrylic hemispheres.
A dome rated for 990 ft (30 bar) in 10C water temperature is only 
rated to 495 ft  (15 bar) in 38C. 
According to this simple sea temperature at depth profiler 
http://www.windows2universe. org/earth/Water/temp.html
at 600 ft most water is under 10C. So you would never expose the dome to
overly high pressures at high temperatures.
I am not sure how G.L. deal with this issue & whether with deeper diving submarines
you would just claim to operate in low temperatures & go for the largest depth
rating for that dome.
To add another dimension to this, I guess you would need to factor in the cabin 
temperature, because that would be effecting the inside of the acrylic.
Also the acrylic having high thermal insulation properties would be slow to cool
down & would remain at a higher temperature than the surrounding water for a
time, especially if diving quickly.
On the plus side there is something like a 5x safety factor in there.
Vance did you ever strike relatively warm temperatures at depth?

Regards Alan

_______________________________________________
Personal_Submersibles mailing list Personal_Submersibles at psubs.org http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles 

_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20131210/5f9b7a08/attachment-0001.html>