[PSUBS-MAILIST] HDPE Sub hull…?

[Jon Wallace via Personal_Submersibles]

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.

Jon



On 4/25/2014 12:12 AM, Jon Wallace via Personal_Submersibles wrote:
>
> For an 1828mm cylinder the ABS calculators are showing 25 feet maximum 
> depth.  The material properties I found were
>
> Modulus of Elasticity: 150000psi
> Yield Stress: 4000psi
> Poisson Ratio: .5
>
> Jon
>
>
> On 4/24/2014 9:17 AM, Dean Cropp via Personal_Submersibles wrote:
>> Hi everyone..
>>
>> 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
>>
>> http://www.vinidex.com.au/products/pe-pipe-systems/pe-pressure-pipe/
>>
>> 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.
>>
>> 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!
>>
>> I have always looked at having HDPE battery pods, what not the whole sub?
>>
>>
>> Dean Cropp
>>
>> ~ Underwater DOP ~ Ocean Wrangler ~
>> Sydney : Australia
>>
>> p: 0416287833  (Int p: +61 416 287 833)
>> e: croppycam at bigpond.com <mailto:croppycam at bigpond.com>
>> s: croppycam
>> w: www.accessallangles.com <http://www.accessallangles.com>
>>
>>
>>
>>
>>
>>
>>
>>
>>
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>
>
>
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