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<DIV><FONT size=3>Hi Alan,</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>I'm going to strive for no-leak just from securing the
hatch. At the least I expect that means machining the landing before the
tower is welded in place and again <EM>after</EM> it's welded in place.
Dan and Alec experimented somewhat with the O-rings to achieve a
solution.</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>Jim</FONT></DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 9/2/2013 11:47:02 A.M. Central Daylight Time,
alanlindsayjames@yahoo.com writes:</DIV>
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<DIV>Jim, Hank,</DIV>
<DIV>I was talking to a sub pilot who had had 10,000 hrs diving various
submarines.</DIV>
<DIV>He said they all leak for the first few feet, even the $3 million dollar
one he was working</DIV>
<DIV>on. Phil said they pull a vacuum on the Deep Workers before they dive to
set the o-rings.</DIV>
<DIV>Maybe that avoids initial leaks.</DIV>
<DIV>Bet Vance could enlighten us here.</DIV>
<DIV>Alan</DIV>
<DIV><BR>Sent from my iPad</DIV>
<DIV><BR>On 2/09/2013, at 4:57 PM, <A title=mailto:JimToddPsub@aol.com
href="mailto:JimToddPsub@aol.com">JimToddPsub@aol.com</A> wrote:<BR><BR></DIV>
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<DIV>
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<DIV><FONT size=3>Hi Hank,</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>See if you agree with my line of thinking: At a
hatch depth of 20 feet you'll have about 9 psi differential on your hatch
and your other penetrations as well. At a hatch depth of 1 foot
you have about .445 psi differential.</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>For many things, the greater the pressure differential,
the greater the chance of a leak or seepage. However on the hatch in
particular (and possibly on some other things), the greater the
pressure forcing the hatch against the landing, the more tightly it
will seal. So the hatch might seal well at depth, but leak when barely
submerged</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>It seems it would be good to do both a high vacuum
and a low vacuum test. If the hatch seals well at high vacuum,
but leaks down at low vacuum, more work is needed on the latches or the
mating surfaces.</FONT></DIV>
<DIV><FONT size=3></FONT> S</DIV></FONT></DIV></BLOCKQUOTE>
<DIV><BR></DIV><BR>
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<DIV><FONT color=#000000 size=2 face=Arial>
<DIV><FONT size=3>Best regards,</FONT></DIV>
<DIV><FONT size=3>Jim</FONT></DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 9/2/2013 9:21:58 A.M. Central Daylight Time, <A
title=mailto:hanker_20032000@yahoo.ca
href="mailto:hanker_20032000@yahoo.ca">hanker_20032000@yahoo.ca</A>
writes:</DIV>
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<DIV style="RIGHT: auto"><SPAN style="RIGHT: auto">Hi James,</SPAN></DIV>
<DIV
style="FONT-SIZE: 16px; FONT-FAMILY: tahoma, new york, times, serif; RIGHT: auto; COLOR: rgb(0,0,0); FONT-STYLE: normal; BACKGROUND-COLOR: transparent"><SPAN
style="RIGHT: auto">I always do a vacuum test before my test dives.
I use a compressor as a vacuum pump and draw out as much air as
possible. Then I have a valve on the hull and a vacuum gauge.
I let it sit for 24 hr. If it holds the vacuum your set.
</SPAN></DIV>
<DIV
style="FONT-SIZE: 16px; FONT-FAMILY: tahoma, new york, times, serif; RIGHT: auto; COLOR: rgb(0,0,0); FONT-STYLE: normal; BACKGROUND-COLOR: transparent"><SPAN
style="RIGHT: auto">Hank<VAR id=yui-ie-cursor></VAR></SPAN></DIV>
<DIV style="RIGHT: auto"><BR style="RIGHT: auto"></DIV>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: tahoma, new york, times, serif">
<DIV
style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif">
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<DIV class=hr contentEditable=false
style="FONT-SIZE: 0px; BORDER-TOP: #ccc 1px solid; HEIGHT: 0px; BORDER-RIGHT: #ccc 1px solid; BORDER-BOTTOM: #ccc 1px solid; PADDING-BOTTOM: 0px; PADDING-TOP: 0px; PADDING-LEFT: 0px; MARGIN: 5px 0px; BORDER-LEFT: #ccc 1px solid; LINE-HEIGHT: 0; PADDING-RIGHT: 0px"
readonly="true"></DIV><FONT size=2 face=Arial><B><SPAN
style="FONT-WEIGHT: bold">From:</SPAN></B> James Frankland <<A
title=mailto:jamesf@guernseysubmarine.com
href="mailto:jamesf@guernseysubmarine.com">jamesf@guernseysubmarine.com</A>><BR><B><SPAN
style="FONT-WEIGHT: bold">To:</SPAN></B> <A
title=mailto:personal_submersibles@psubs.org
href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>
<BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Monday, September
2, 2013 3:45:27 AM<BR><B><SPAN
style="FONT-WEIGHT: bold">Subject:</SPAN></B> [PSUBS-MAILIST] Leak,
pressure and life support test<BR></FONT></DIV>
<DIV class=y_msg_container style="RIGHT: auto"><BR>
<DIV id=yiv1016670701 style="RIGHT: auto">
<DIV>Hi All,</DIV>
<DIV> </DIV>
<DIV>I did some tests at the weekend. Very small pics attached as i
havent updated my site yet.</DIV>
<DIV style="RIGHT: auto"> </DIV>
<DIV style="RIGHT: auto">First i tested the battery pods and seals with
old inner tubes. Managed to pump them to about 5psi. Not much
but i think it was ok to indicate any leaks. I couldnt see or hear
anything and pressure remained steady.</DIV>
<DIV> </DIV>
<DIV>Then i did the very sophisticated "saucepan test" over the hatch
viewport. I was just a bit suspicious of this one as it has no
gasket, the lense seats directly to the face. No leak, but agreed,
not much test pressure although the saucepan was full despite the spillage
out the sides.</DIV>
<DIV> </DIV>
<DIV>Next i did a life support test. I filled and ran the scrubber
and then sat inside for an hour with the hatch sealed. CO2 seemed to
level out at about 5500ppm and i topped up O2 when it got to
19%. </DIV>
<DIV> </DIV>
<DIV>i also dropped half a psi of internal pressure and that seemed to
hold, so i am hoping the boat is tight.</DIV>
<DIV> </DIV>
<DIV>I was going to do a leak test in a local fresh water resovoir,
but as im a bit more confident its not going to leak now and its such a
logistical fuss, im going to go straight in the sea. Next
week.</DIV>
<DIV>Kind Regards</DIV>
<DIV>James</DIV>
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