<font color='black' size='3' face='Arial, Helvetica, sans-serif'><font class="Apple-style-span" size="3">That or higher.</font>
<div><font class="Apple-style-span" size="3">Vance<br>
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<div style="font-family: helvetica, arial; font-size: 10pt; color: black; ">-----Original Message-----<br>
From: Alan James <alanlindsayjames@yahoo.com><br>
To: Personal Submersibles General Discussion <personal_submersibles@psubs.org><br>
Sent: Tue, Dec 10, 2013 3:40 am<br>
Subject: Re: [PSUBS-MAILIST] Acrylic temperature rating<br>
<br>
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<div><span>Thanks,</span></div>
<div style="color: rgb(0, 0, 0); font-size: 18.88888931274414px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;"><span>that's hot. I read it gets up to 32 Celsius at the surface</span></div>
<div style="color: rgb(0, 0, 0); font-size: 18.88888931274414px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;"><span>in the Persian gulf.</span></div>
<div style="color: rgb(0, 0, 0); font-size: 18.88888931274414px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;"><span>Alan</span></div>
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<div dir="ltr"> <hr size="1"> <font size="2" face="Arial"> <b><span style="font-weight:bold;">From:</span></b> "<a href="mailto:vbra676539@aol.com">vbra676539@aol.com</a>" <<a href="mailto:vbra676539@aol.com">vbra676539@aol.com</a>><br>
<b><span style="font-weight: bold;">To:</span></b> <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a> <br>
<b><span style="font-weight: bold;">Sent:</span></b> Tuesday, December 10, 2013 4:24 PM<br>
<b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Acrylic temperature rating<br>
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<div><font color="black" size="3" face="Arial, Helvetica, sans-serif"><font class="yiv0408592237Apple-style-span" size="3">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.</font>
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<div><font class="yiv0408592237Apple-style-span" size="3">Vance<br clear="none">
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<div style="font-family: helvetica, arial; font-size: 10pt; color: black;">-----Original Message-----<br clear="none">
From: Alan James <<a href="mailto:alanlindsayjames@yahoo.com">alanlindsayjames@yahoo.com</a>><br clear="none">
To: psubs.org <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none">
Sent: Mon, Dec 9, 2013 9:56 pm<br clear="none">
Subject: [PSUBS-MAILIST] Acrylic temperature rating<br clear="none">
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<div style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 14pt;">
<div style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 12.800000190734863px;">Just something interesting I found in G.L. with regard to depth</div>
<div style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 12.800000190734863px;">rating of acrylic hemispheres.</div>
<div style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 12.800000190734863px;">A dome rated for 990 ft (30 bar) in 10C water temperature is only </div>
<div style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 12.800000190734863px;">rated to 495 ft (15 bar) in 38C. </div>
<div style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 12.800000190734863px;">According to this simple sea temperature at depth
profiler </div>
<div style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 12.800000190734863px;"><span style="font-size:15px;line-height:19px;white-space:nowrap;"><a rel="nofollow" shape="rect" target="_blank" href="http://www.windows2universe.org/earth/Water/temp.html" style="color:rgb(17, 85, 204);">http://www.windows2universe. org/earth/Water/temp.html</a></span></div>
<div style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 12.800000190734863px;"><span style="font-size:15px;line-height:19px;white-space:nowrap;">at 600 ft most water is under 10C. So you would never expose the dome to</span></div>
<div style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 12.800000190734863px;"><span style="font-size:15px;line-height:19px;white-space:nowrap;">overly high pressures at high temperatures.</span></div>
<div style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 12.800000190734863px;"><span style="font-size:15px;line-height:19px;white-space:nowrap;">I am not sure how G.L. deal with this issue & whether with deeper diving submarines</span></div>
<div style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 12.800000190734863px;"><span style="font-size:15px;line-height:19px;white-space:nowrap;">you would just claim to operate in low temperatures & go for the largest depth</span></div>
<div style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 12.800000190734863px;"><span style="font-size:15px;line-height:19px;white-space:nowrap;">rating for that dome.</span></div>
<div style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 12.800000190734863px;"><span style="font-size:15px;line-height:19px;white-space:nowrap;">To add another dimension to this, I guess you would need to factor in the cabin </span></div>
<div style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 12.800000190734863px;"><span style="font-size:15px;line-height:19px;white-space:nowrap;">temperature, because that would be effecting the inside of the acrylic.</span></div>
<div style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 12.800000190734863px;"><span style="font-size:15px;line-height:19px;white-space:nowrap;">Also the acrylic having high thermal insulation properties would be slow to cool</span></div>
<div style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 12.800000190734863px;"><span style="font-size:15px;line-height:19px;white-space:nowrap;">down & would remain at a higher temperature than the surrounding water for a</span></div>
<div style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 12.800000190734863px;"><span style="font-size:15px;line-height:19px;white-space:nowrap;">time, especially if diving
quickly.</span></div>
<div style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 12.800000190734863px;"><span style="font-size:15px;line-height:19px;white-space:nowrap;">On the plus side there is something like a 5x safety factor in there.</span></div>
<div style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 12.800000190734863px;"><span style="font-size:15px;line-height:19px;white-space:nowrap;">Vance did you ever strike relatively warm temperatures at depth?</span><br clear="none">
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<div style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 12.800000190734863px;"><span style="font-size:15px;line-height:19px;white-space:nowrap;">Regards Alan</span></div>
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