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<DIV>Hello, Roberto,</DIV>
<DIV> </DIV>
<DIV>The LPG tanks are designed to contain internal pressure, not to withstand
external pressure. Also the hydrocarbons from the gas migrate into the
metal and interfere with the integrity of new welds. A few people have
made very shallow subs from LPG used tanks, but you wouldn't really gain much
cost advantage, and you would sacrifice capability and safety. You would
also run into other problems installing the hull penetrations. Many of us
initially thought of using an old propane tank, but quickly discarded the
idea.</DIV>
<DIV> </DIV>
<DIV>On the Psubs site if you will go to <EM>PSUBS Community</EM>, then
<EM>Projects & Photos</EM>, you will be able to look at the journals of the
building process of a number of subs. These two links are
excellent: <A
href="http://www.psubs.org/projects/1245611411/kw350trustworthy/">http://www.psubs.org/projects/1245611411/kw350trustworthy/</A></DIV>
<DIV><A
href="http://www.guernseysubmarine.com/">http://www.guernseysubmarine.com/</A>
You will learn a lot from both of them.</DIV>
<DIV> </DIV>
<DIV>The process of building a sub from an existing design takes a long
time. Creating a new design takes much longer. </DIV>
<DIV> </DIV>
<DIV>Best wishes,</DIV>
<DIV>Jim T. </DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 11/12/2014 2:52:30 P.M. Central Standard Time,
personal_submersibles@psubs.org writes:</DIV>
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<DIV id=yui_3_16_0_1_1415824464895_5265 dir=ltr><SPAN>Hi Roberto,</SPAN></DIV>
<DIV id=yui_3_16_0_1_1415824464895_5265 dir=ltr><SPAN
id=yui_3_16_0_1_1415824464895_5267>>>></SPAN><SPAN
id=yui_3_16_0_1_1415824464895_5278
style="FONT-SIZE: 13px; FONT-FAMILY: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif">learn
that i can be safe on a composite hull, even a wood hull below the 100 ft i
can dive even on an oil drum</SPAN><SPAN
style="FONT-SIZE: 13px; FONT-FAMILY: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif"> ....</SPAN></DIV>
<DIV id=yui_3_16_0_1_1415824464895_5265 dir=ltr><SPAN
id=yui_3_16_0_1_1415824464895_5291
style="FONT-SIZE: 13px; FONT-FAMILY: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif">
NO you won't be safe with any of those 3. Years ago we calculated that an oil
drum wouldn't be safe to 15ft, & it also depends on it's
condition.</SPAN></DIV>
<DIV id=yui_3_16_0_1_1415824464895_5265 dir=ltr><SPAN
id=yui_3_16_0_1_1415824464895_5292
style="FONT-SIZE: 13px; FONT-FAMILY: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif">Fiberglass
is very difficult to analyze for strength due to the human equation, the
saturation of the cloth & the fact that the cloth has different strengths
in</SPAN></DIV>
<DIV id=yui_3_16_0_1_1415824464895_5265 dir=ltr><SPAN
id=yui_3_16_0_1_1415824464895_5293
style="FONT-SIZE: 13px; FONT-FAMILY: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif">different
directions. At 100ft there is about 7,200lb pressure on every square foot of
your hull, so calculations have to be very accurate to avoid being paste in a
can on the sea bed:).</SPAN></DIV>
<DIV id=yui_3_16_0_1_1415824464895_5265 dir=ltr><SPAN
id=yui_3_16_0_1_1415824464895_5376
style="FONT-SIZE: 13px; FONT-FAMILY: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif">Did
you see Phil Nuyten's paper on life support. It is very good.</SPAN></DIV>
<DIV id=yui_3_16_0_1_1415824464895_5265 dir=ltr><SPAN
style="FONT-SIZE: 13px; FONT-FAMILY: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif">Alan</SPAN></DIV><BR>
<DIV id=yui_3_16_0_1_1415824464895_5275
style="FONT-SIZE: 16px; FONT-FAMILY: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif">
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style="FONT-SIZE: 16px; FONT-FAMILY: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif">
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<FONT id=yui_3_16_0_1_1415824464895_5277 size=2 face=Arial><B><SPAN
style="FONT-WEIGHT: bold">From:</SPAN></B> roberto alvarez via
Personal_Submersibles <personal_submersibles@psubs.org><BR><B><SPAN
style="FONT-WEIGHT: bold">To:</SPAN></B> personal_submersibles@psubs.org
<BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Thursday, November 13,
2014 7:11 AM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B>
[PSUBS-MAILIST] just more calc<BR></FONT></DIV>
<DIV id=yui_3_16_0_1_1415824464895_5273 class=y_msg_container><BR>
<DIV id=yiv8630188239>
<DIV id=yui_3_16_0_1_1415824464895_5298 dir=ltr>
<DIV id=yui_3_16_0_1_1415824464895_5297>
<DIV id=yui_3_16_0_1_1415824464895_5296>
<DIV id=yui_3_16_0_1_1415824464895_5295>
<DIV id=yui_3_16_0_1_1415824464895_5294>Good morning this weekend i read the
book on the psubs website as i can read ,is a collection of designs and
experiences, i am working with the air volume and CO2 production, this because
i divide the project in 3 main areas, pressure hull-life support-control &
propultion<BR></DIV>learn that i can be safe on a composite hull, even a wood
hull below the 100 ft i can dive even on an oil drum , the main concern
will be O2 depletion and CO2 pollution we exhale 1.7 cubic feet hour and
by coincidence we need 1.7 cubic meters per day<BR></DIV>will use this info
for a better internal space before any other consideration, yesterday i went
to a LPG truck scrap yard, found that the inside of the tanks are free of
rust, they have wave brakers ( internal plates ) have inspection holes
with 2 inch tempered glass and build from 0.500 inch plate, 54 inch in
diameter and 12 feet lengh, <BR><BR></DIV>
<DIV id=yui_3_16_0_1_1415824464895_5299>may be other option<BR></DIV></DIV>
<DIV id=yui_3_16_0_1_1415824464895_5303>
<DIV id=yui_3_16_0_1_1415824464895_5302>
<DIV id=yui_3_16_0_1_1415824464895_5301>
<DIV
id=yui_3_16_0_1_1415824464895_5300><BR></DIV></DIV></DIV></DIV></DIV></DIV><BR>_______________________________________________<BR>Personal_Submersibles
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