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Sorry, scratch that previous message...I used the wrong thickness
(damn metric numbers)...for 60mm thickness I get 102psi or 229 fsw
max working depth. You'll need to find the exact properties of
the material that you purchase. Even so, such pipe is likely not
manufactured precisely and is likely to have significantly less
performance than the calculator would suggest. I can relate a
real world example...Lea Nichols built punched in PVC properties
for a dive light and calculated failure somewhere over 100 feet
however in real use the light imploded in less than 30 feet of
water.<br>
<br>
Jon<br>
<br>
<br>
<br>
On 4/25/2014 12:12 AM, Jon Wallace via Personal_Submersibles
wrote:<br>
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For an 1828mm cylinder the ABS calculators are showing 25 feet
maximum depth. The material properties I found were<br>
<br>
Modulus of Elasticity: 150000psi<br>
Yield Stress: 4000psi<br>
Poisson Ratio: .5<br>
<br>
Jon<br>
<br>
<br>
On 4/24/2014 9:17 AM, Dean Cropp via Personal_Submersibles
wrote:<br>
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cite="mid:73D40E70-F1BF-49D4-AB1B-AC9401653A25@bigpond.com"
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<div>Hi everyone..</div>
<div><br>
</div>
<div>I an still toying with two designs of PSUB, one larger,
steel and with an AUX diesel engine 3PAX…. But also with a
smaller 2PAX more mobile system and have been looking into the
possibility of using HDPE as a hull material for a small
100msw PSUB</div>
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<div><a moz-do-not-send="true"
href="http://www.vinidex.com.au/products/pe-pipe-systems/pe-pressure-pipe/">http://www.vinidex.com.au/products/pe-pipe-systems/pe-pressure-pipe/</a></div>
<div><br>
</div>
<div>There is off the shelf (Sort of) 1000mm OD pipe here in
Australia with a 60mm wall thickness but I have also come
across a 1360mm-OD and 1650mm-OD pipe again with 60mm wall
thickness that may be available. HDPE can be welded, drilled
and tapped quite well and using fittings/penatrators made of
delrin with o'ring seals has worked well on some camera
housings I have made.</div>
<div><br>
</div>
<div>Has anyone looked further into this? is the wall thickness
enough to just have bulkheads instead of stiffeners? no
corrosion problems and it is super slippy in the water!</div>
<div><br>
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<div>I have always looked at having HDPE battery pods, what not
the whole sub?</div>
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0px; text-transform: none; white-space: normal; widows: 2;
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0px; word-wrap: break-word; -webkit-nbsp-mode: space;
-webkit-line-break: after-white-space; ">
<div style="color: rgb(0, 0, 0); font-family: Helvetica;
font-size: medium; font-style: normal; font-variant:
normal; font-weight: normal; letter-spacing: normal;
line-height: normal; orphans: 2; text-align:
-webkit-auto; text-indent: 0px; text-transform: none;
white-space: normal; widows: 2; word-spacing: 0px;
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-webkit-nbsp-mode: space; -webkit-line-break:
after-white-space; ">
<div style="color: rgb(0, 0, 0); font-family: Helvetica;
font-size: medium; font-style: normal; font-variant:
normal; font-weight: normal; letter-spacing: normal;
line-height: normal; orphans: 2; text-align:
-webkit-auto; text-indent: 0px; text-transform: none;
white-space: normal; widows: 2; word-spacing: 0px;
-webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; word-wrap: break-word;
-webkit-nbsp-mode: space; -webkit-line-break:
after-white-space; ">
<div>Dean Cropp</div>
<div><br>
</div>
<div>~ Underwater DOP ~ Ocean Wrangler ~ </div>
<div><span class="Apple-tab-span" style="white-space:
pre; "> </span>Sydney : Australia</div>
<div><br>
</div>
<div>p: 0416287833 (Int p: +61 416 287 833)</div>
<div>e: <a moz-do-not-send="true"
href="mailto:croppycam@bigpond.com">croppycam@bigpond.com</a></div>
<div>s: croppycam</div>
<div>w: <a moz-do-not-send="true"
href="http://www.accessallangles.com">www.accessallangles.com</a></div>
<div><br>
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