[PSUBS-MAILIST] Pressure Test

[k6fee via Personal_Submersibles]

Hank,
Compressed H2 gas.
Keith T.


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-------- Original message --------From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> Date: 7/10/17  2:25 PM  (GMT-08:00) To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> Subject: Re: [PSUBS-MAILIST] Pressure Test 
Kieth,What are you up to that you need a cng tank?Hank 

    On Monday, July 10, 2017 9:13 AM, k6fee via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
  

 Hank,
Thanks for the info, I'll check out Evil Bay and see what I can find. 
Keith T 


Sent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> Date: 7/10/17  2:48 AM  (GMT-08:00) To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> Subject: Re: [PSUBS-MAILIST] Pressure Test 
Kieth,There are CNG tanks on Ebay, with some sellers that have lots of tanks that are still in service.  The largest composite CNG tank I have come across is 21 inches OD by 120 inches long.  There is a seller close to Salt Lake City Utah with a pretty big inventory.Hank 

    On Sunday, July 9, 2017 9:24 PM, k6fee via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
  

 Where are you guy sourcing the CNG tanks? Are larger diameter tanks available?
Keith T 


Sent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> Date: 7/9/17  7:49 PM  (GMT-08:00) To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> Subject: Re: [PSUBS-MAILIST] Pressure Test 
Steve,Greg was referring to steel cng storage tanks that are 48 inch ID spheres 3.25 inches thick. I have also been looking at composite cng type 4 tanks as buoyancy modules.  The tanks would be at full pressure (3,600 psi) Hank 

    On Sunday, July 9, 2017 8:44 PM, Stephen Fordyce via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
  

 Hi Hank,I was under the impression your CNG spheres are composite/fibre-wrapped?  I presume you're aware that using a model based on metal components wouldn't apply well to composite.
I think I posted about it, but I've done a lot of research and some testing on using composite cylinders underwater and it's potentially a bit scary, especially with salt water.  If anyone is interested I can go into more detail.
Cheers,Steve
On Mon, Jul 10, 2017 at 11:53 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
I use the calculator on Psubs written by Alec, it is fabulous because you change the values for different materials.  Hank 

    On Sunday, July 9, 2017 7:17 PM, james cottrell via Personal_Submersibles <personal_submersibles at psubs. org> wrote:
  

 I still think that a CNG sphere will go way deeper. How did you calculate that?

       From: hank pronk via Personal_Submersibles <personal_submersibles at psubs. org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs. org> 
 Sent: Sunday, July 9, 2017 4:38 PM
 Subject: Re: [PSUBS-MAILIST] Pressure Test
   
Very true.I do love the idea, but, weight is a real killer, every pound is super critical.  If I go with a 7500 footer then the buoyancy is cheap because I will use CNG tanks, don't tell Sean ;-)   Then it will be awesome to have it rotate, just think you can rotate so the port is pointing down between your feet.Hank 

    On Sunday, July 9, 2017 2:26 PM, james cottrell via Personal_Submersibles <personal_submersibles at psubs. org> wrote:
  

 Yes....BUT...being able to get out on your own is never a bad thing.

       From: hank pronk via Personal_Submersibles <personal_submersibles at psubs. org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs. org> 
 Sent: Sunday, July 9, 2017 4:12 PM
 Subject: Re: [PSUBS-MAILIST] Pressure Test
   
Greg,That was my original plan, I think it is a great idea for a shallow diver.  But if your going real deep then chances are it will be lowered into the water from a boat or barge, so need for the swivel.  If I end up being less ambitious, and build an Elementary 7,500 I will do just that.Hank 

    On Sunday, July 9, 2017 1:57 PM, james cottrell via Personal_Submersibles <personal_submersibles at psubs. org> wrote:
  

 Hank,
I was thinking that it might be possible to mount a sp
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