[PSUBS-MAILIST] Pressure Test

Sun Jul 9 22:43:41 EDT 2017

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 sphere within a steel
> frame that allows it to swivel up and down like a gun turret in a bomber.
> That way, the forward viewport could be incorporated into the hatch and the
> hatch/ port could be in the "up" position to get in and out and then in the
> "down" position during the dive for viewing. All internal components could
> be mounted on an internal frame that hangs from a bearing so that the pilot
> is always upright. The main ballast system could be a pair of port/
> starboard pontoons.
>
> For a shallow diving sub, the hatch/ port could be a large dome for good
> viewing. A self draining "sail" could also be added around the hatch/ port.
> If Darth Vader had a sub it would look like that one!
>
> Greg
>
>
> ------------------------------
> *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 3:27 PM
> *Subject:* Re: [PSUBS-MAILIST] Pressure Test
>
> Greg,
> Not a bad idea.  I have lots of time, I still need to finish Elementary
> 3000.  I am not planning to buy heads until fall of 2018.  I only bought
> the vertical lathe because I got a SMOKIN deal and what are the chances of
> finding another  machine like that in the Canadian prairies.
> Hank
>
>
> On Sunday, July 9, 2017 12:23 PM, james cottrell via Personal_Submersibles
> <personal_submersibles at psubs.org> wrote:
>
>
> Hank,
>
> You may want to contact these guys before spending a lot of $$$
>
> Australia Pressure Vessel Heads 2011 Pty Ltd
> <http://www.austpvheads.com.au/>
>
> Australia Pressure Vessel Heads 2011 Pty Ltd
> <http://www.austpvheads.com.au/>
>
>
> Greg C
>
>
> ------------------------------
> *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 1:23 PM
> *Subject:* Re: [PSUBS-MAILIST] Pressure Test
>
> Greg,
> Hmmm, just googled EN 26 and it considered machinable even  hardened and
> tempered, but what does that mean?
> Hank
>
>
> On Sunday, July 9, 2017 11:12 AM, hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
> Greg,
> I asked EE if they could make HY heads and they can but need a quenching
> tank.  I can not find a supplier that can supply large enough pieces of HY
> steel  to press a hemispherical head.  EE does not supply anything but
> 516-70 .  I can ask them but would need to source the material first.  I
> would need to be sure I can even machine that material, I kinda doubt it?
> Hank
>
>
> On Sunday, July 9, 2017 10:36 AM, james cottrell via Personal_Submersibles
> <personal_submersibles at psubs.org> wrote:
>
>
> Hank,
>
> Do you know if EE can fabricate your hull from EN26 steel? The hull that
> Ron A. had fabricated was only 2.5" thick and went full ocean depth with
> plenty of safety factor. Using the same grade steel in a thickness designed
> for only 13,000 ft might save a lot of weight.
>
> Greg C
>
> ------------------------------
> *From:* hank pronk via Personal_Submersibles <personal_submersibles at psubs.
> org>
> *To:* Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> *Sent:* Monday, June 26, 2017 7:54 AM
> *Subject:* Re: [PSUBS-MAILIST] Pressure Test
>
> Alan,
> That really turned out nice, how did you mould the polyurethane? that
> stuff sticks like mad.
> I would leave the white gasket, it looks fine.  Either the gasket
> thickness is not even or the seat is not perfectly matched to the Lenz.
>
>
> On Sunday, June 25, 2017 10:30 PM, Alan via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
> Pressure tested my light to 1000 psi for an hour using the water blaster
> & no leaks! I didn't have a pressure relief valve in the system as I do
> with
> my air pressure set up & it was a pain getting the chamber lid off. I had
> thought the water blaster would have leaked a bit of pressure but it
> didn't.
> The sealing system for the wires was a 3 layered process; encapsulating the
> wires in the epoxy, then coating the insulation for an inch up from where
> they came
> out of  the epoxy, & over the epoxy with a 2 part heat activated pvc glue
> that
> they use on inflatable boats. This glue worked a lot better on the pvc
> insulation
> than several others I tried like E61000 (supposed to be better than shoe
> goo),
> 3M 5200 & polyurethane.
> Over this, to tidy it up & act as a cable support, I moulded polyurethane.
> In the attached photos the white ptfe gasket that the lens sits on looks
> wet
> but it is just the compression of the lens against the gasket. I don't
> like this
> from a cosmetic point & may change it. The 2 objects with the light are the
> male mould for the polyurethane cable support & the silicone mould for the
> same.
> Alan
>
>
>
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