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<html><head><meta http-equiv="Content-Type" content="text/html;
charset=ISO-8859-1" /><title>E-Mail Software 6.0</title></head><body link="#000000" vlink="#000000" alink="#000080" topmargin="0" leftmargin="0" marginwidth="0" marginheight="0"><p dir="ltr">One presumes that there could potentially be an issue with either thermal shock to the acrylic window, or with o-ring compliance when taking a sub at thermal equilibrium on a frigid deck (-30° C) and immersing it in seawater at ~0° C. It takes some time for both acrylic and elastomers to warm up - they are poor conductors of heat. Don't the o-rings stiffen in the cold?</p>
<p dir="ltr">Sean<br>
</p>
<br><br><div class="gmail_quote"> <MerlinSub@t-online.de> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<font face="Courier New" size="2">Hi Hank,<br /> <br />the limit
according to GL is -18 celius degree <br />- a temp seawater can not
reach. <br /><br />The max temp to GL is 66
degree.<br /><br />In general
colder is better for the pressure resistant of the windows
(acryl). <br /><br />vbr Carsten<br /> </font>
<br />
<br />"hank pronk" <hanker_20032000@yahoo.ca> schrieb:
<blockquote style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT:
#000000 2px solid; PADDING-RIGHT: 0px; MARGIN-RIGHT: 0px">
<div style="FONT-SIZE: 12pt; FONT-FAMILY: HelveticaNeue, Helvetica Neue,
Helvetica, Arial, Lucida Grande, sans-serif; COLOR: #000;
BACKGROUND-COLOR: #fff"><div>Is there an adverse effect from cold temperatures on ports.
I hear about cold weather dives in the North Sea etc.</div><div>When is
it to cold for ports if ever?</div><div>Hank</div></div>
</blockquote>
<font face="Courier New" size="2"> </font>
<p style="margin-top: 2.5em; margin-bottom: 1em; border-bottom: 1px solid #000"></p><pre class="k9mail"><hr /><br />Personal_Submersibles mailing list<br />Personal_Submersibles@psubs.org<br /><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br /></pre></blockquote></div></body></html>