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<DIV><FONT size=3>Hi James,</FONT></DIV>
<DIV><FONT size=3>Could you tighten down the hatch from the outside with
hold-down straps such as you use for securing a load on a trailer? Or you
could place some weights on a platform on top of the hatch.</FONT></DIV>
<DIV><FONT size=3>Jim</FONT></DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 9/2/2013 11:30:30 A.M. Central Daylight Time,
jamesf@guernseysubmarine.com writes:</DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT
style="BACKGROUND-COLOR: transparent" color=#000000 size=2 face=Arial>
<DIV>Hi Guys,</DIV>
<DIV> </DIV>
<DIV>Sounds like the overnight vacuum test is a really good idea.
Unfortunately i only have the standard hatch so i cant close it from
outside . I'll have to see if i can suck it down like Hank
suggests. Got a few days to tinker.</DIV>
<DIV>Regards</DIV>
<DIV>James</DIV>
<DIV> </DIV>
<DIV><BR><BR> </DIV>
<DIV class=gmail_quote>On 2 September 2013 17:12, hank pronk <SPAN
dir=ltr><<A title=mailto:hanker_20032000@yahoo.ca
href="mailto:hanker_20032000@yahoo.ca"
target=_blank>hanker_20032000@yahoo.ca</A>></SPAN> wrote:<BR>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<DIV>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: tahoma,new york,times,serif">
<DIV><SPAN>Hi Jim,</SPAN></DIV>
<DIV
style="FONT-SIZE: 16px; FONT-FAMILY: tahoma,new york,times,serif; FONT-STYLE: normal; BACKGROUND-COLOR: transparent"><SPAN>I
am no expert on the subject, but I do a test with as much vacuum as
possible. When you dive the hatch is secured tight so there is always
pressure on the seal. Before I converted my k350 hatch to open from
both sides, I did the vacuum test without securing the hatch. I does
not take much vacuum to suck the hatch down tight. Honestly I am not
sure about a low vacuum test, you could be
right. <VAR></VAR> I just assumed it should be more than
less. Before I tested my last sub in the lake, I did a vacuum
test and I did loose vacuum overnight. It was very minor, so I went
anyways. Sure enough I had a leak, I took on a couple of litres of
water at 200 feet for an hr. I think my connection point from the
acrylic cylinder to the hatch land was the problem. There is no seal,
it is cast in place. </SPAN></DIV>
<DIV
style="FONT-SIZE: 16px; FONT-FAMILY: tahoma,new york,times,serif; FONT-STYLE: normal; BACKGROUND-COLOR: transparent"><SPAN>Hank</SPAN></DIV>
<DIV
style="FONT-SIZE: 16px; FONT-FAMILY: tahoma,new york,times,serif; FONT-STYLE: normal; BACKGROUND-COLOR: transparent"><BR></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">
<DIV dir=ltr>
<DIV
style="FONT-SIZE: 0px; BORDER-TOP: #ccc 1px solid; BORDER-RIGHT: #ccc 1px solid; BORDER-BOTTOM: #ccc 1px solid; PADDING-BOTTOM: 0px; PADDING-TOP: 0px; PADDING-LEFT: 0px; MARGIN: 5px 0px; MIN-HEIGHT: 0px; BORDER-LEFT: #ccc 1px solid; LINE-HEIGHT: 0; PADDING-RIGHT: 0px"
readonly></DIV><FONT face=Arial><B><SPAN
style="FONT-WEIGHT: bold">From:</SPAN></B> "<A
title=mailto:JimToddPsub@aol.com href="mailto:JimToddPsub@aol.com"
target=_blank>JimToddPsub@aol.com</A>" <<A
title=mailto:JimToddPsub@aol.com href="mailto:JimToddPsub@aol.com"
target=_blank>JimToddPsub@aol.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"
target=_blank>personal_submersibles@psubs.org</A> <BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B> Monday, September 2, 2013 8:57:18
AM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re:
[PSUBS-MAILIST] Leak, pressure and life support test<BR></FONT></DIV>
<DIV>
<DIV class=h5>
<DIV><BR>
<DIV>
<DIV><FONT color=#000000 face=Arial>
<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> </DIV>
<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"
target=_blank>hanker_20032000@yahoo.ca</A> writes:</DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT
style="BACKGROUND-COLOR: transparent" color=#000000 face=Arial>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: tahoma,new york,times,serif">
<DIV><SPAN>Hi James,</SPAN></DIV>
<DIV
style="FONT-SIZE: 16px; FONT-FAMILY: tahoma,new york,times,serif; FONT-STYLE: normal; BACKGROUND-COLOR: transparent"><SPAN>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; FONT-STYLE: normal; BACKGROUND-COLOR: transparent"><SPAN>Hank<VAR></VAR></SPAN></DIV>
<DIV><BR></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">
<DIV dir=ltr>
<DIV
style="FONT-SIZE: 0px; BORDER-TOP: #ccc 1px solid; BORDER-RIGHT: #ccc 1px solid; BORDER-BOTTOM: #ccc 1px solid; PADDING-BOTTOM: 0px; PADDING-TOP: 0px; PADDING-LEFT: 0px; MARGIN: 5px 0px; MIN-HEIGHT: 0px; BORDER-LEFT: #ccc 1px solid; LINE-HEIGHT: 0; PADDING-RIGHT: 0px"></DIV><FONT
face=Arial><B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> James
Frankland <<A title=mailto:jamesf@guernseysubmarine.com
href="mailto:jamesf@guernseysubmarine.com"
target=_blank>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"
target=_blank>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><BR>
<DIV>
<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> </DIV>
<DIV>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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