[PSUBS-MAILIST] material question

hank pronk via Personal_Submersibles personal_submersibles at psubs.org
Thu May 10 05:48:16 EDT 2018


 Emile, I would weigh the part then pressurize it for for several hours then weigh it again.  If there is water absorbed it may still be in the part after removing it from the chamber.  You can also put the part under stress by bending it over a fixture, then pressure test it while under stress.  You can stress the part to near failure in a fixture then pressure test it for several days.  If it can handle that then your good to go, I would think. I would bet the propellers will work just fine at 5,000 psi.Hank
    On Thursday, May 10, 2018, 1:55:09 AM MDT, emile via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
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Thanks for the respons .

Testing sounds logical but it should be long term and it is difficult to measure the water ingress.

  

Polyester yachts do have a osmosis problem when they sit all year in the water. 

  

We use thin fiberglass plate in the rim thrusters and we want to use it in a deep diving ROV. 

  

Br, Emile

  

Van: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] Namens Alan via Personal_Submersibles
Verzonden: woensdag 9 mei 2018 23:39
Aan: Personal Submersibles General Discussion
Onderwerp: Re: [PSUBS-MAILIST] material question

  

Hi Emile,

my brother-in-laws fibreglass yacht has been sitting in the harbour

for at least 30 years, so pretty impervious to water.

The glass in the fibre would not crush, but the resin around it would squash

a little under that pressure. I would think the resin would seal any exposed 

fibres by squashing around them when put under that kind of pressure.
What are you sending down that deep?

Alan
Sent from my iPad


On 10/05/2018, at 5:34 AM, emile via Personal_Submersibles <personal_submersibles at psubs.org> wrote:


Hi All, 

 

Material question:

Can prefabricated epoxy/glassfibre plate material (like PCB) withstand 5000M / 18.000Ft  presurised water? 

Or will it be impregnated after a while?

 

Thanks in advance

 

met vriendelijke groet, with best regards

 

Emile D.L. van Essen

 



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