[PSUBS-MAILIST] Pressure Test Chamber

Wed Nov 18 23:18:43 EST 2015

Hi Steve,no I didn't see that post. Thanks. I am getting a test chamber made up by a hydraulics firm & are having a port in the removable end plate to attachthrough hulls to the inside of. I think that's what you suggested,but your sketch didn't come through.I got the Blue Globe Cable Glands from Australia via Siemens NZ. Their distributor is Siemens Ltd. Automation & Drives885 Mountain Highway3153 Bayswater VICso just down the road from you :)
Could put some in my daughters pocket, if they aren't holding stock; but you wouldn't see them till 4th Nov. I have some M16 & some adapters16-20mm.Cheers Alan

      From: Stephen Fordyce via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Thursday, November 19, 2015 4:41 PM
 Subject: Re: [PSUBS-MAILIST] Pressure Test Chamber

Hi all,
Just wondering if my last post on this subject went though?  I'm curious about whether the inside-out testing chamber is useful to anyone (and also to heat from Alan about where to get blue globe cable glands down under).Cheers,
SteveOn 16/11/2015 1:37 PM, "Stephen Fordyce" <stephen.fordyce at gmail.com> wrote:

Hey guys,
If you're going to make a small pressure chamber to go inside the big one just for testing penetrators, how about just making your small one so that you can screw the penetrator onto the inside of it?See sketch attached.I did this to test some cable gland/penetrators I made for underwater lights and it was very quick and easy to put together, it was small enough that I could use standard black plastic fittings from Bunnings as they were rated to something like 100m water depth.I also found that sealing the end of the cable with liquid electrical tape worked fine to prevent leaks through the cable stands at these pressures (but only for external pressure!).Cheers,
StevePS: where/how do you get blue globe cable glands down under??On 16/11/2015 6:38 AM, "Alan James via Personal_Submersibles" <personal_submersibles at psubs.org> wrote:

Hank,you are right. My first port of call is to visit a large hydraulicservice & manufacturing plant in case they have something lying around, or can suggest anything. I have been reading the penetrator section in"Busby". Apparently the European method is to take the cableright through the penetrator & the American method is to havepins going through. With the European method sometimes theyinject resin under pressure inside the individual wire insulationsto seal them in case the cable is sheared.G.L. require that there is no leak after a cable breakage, so Ithink the pin option is better in that case. Busby said most of the failures happened at the pin / wiring interface. I imagine it would be a weak point if you pulled on the cable. The idea of supporting this point with the silicone & casting over the top must have merit. Some manufacturers brazed washers to the pins to stop them extruding through the resin. I don't think I need to worry about that at 500ft, but maybe a few dots of brazing on the pins would help it a bit.Cheers Alan
      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Monday, November 16, 2015 7:46 AM
 Subject: Re: [PSUBS-MAILIST] Pressure Test Chamber

Alan,I was looking around NZ online for a hydraulic cylinder, you guys have it tough for surplus stuff.  Hank 

  On Sunday, November 15, 2015 11:04 AM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Thanks Hank,I like your idea of the small air chamber to test the through hulls,I was intending to screw them to the inside of a fitting in the end cap / lid.Will make inquiries re cylinders.Alan
      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Monday, November 16, 2015 2:30 AM
 Subject: Re: [PSUBS-MAILIST] Pressure Test Chamber

Hi alan,My cylinder is very unusual because it is light weight for a crane.  But yes, you leave the piston in, if it is double acting and either all of the rod or cut the excess off, I would leave it intact.  I can either use water or air, normally I think you would fill with water for safety also to locate a leak in your test part.  I use air because the cylinder is safe and rated.  If you find a double acting cylinder, you can also remove the piston and just use the piston nut and washer to hold the rod in from pushing out.  Then you can use the second port for filling with water while it vents out the opposite port.  Then you just need a tee with gauge and valve.  You can pressurize it with your scuba tank or a pressure washer.  The scuba tanks make the most sense  if you fill with water first so you displace all the air.  You will need to make a small air chamber to go inside if your testing your penetrators.  Just take a pipe threaded at both ends, screw a cap on one end and a fitting at the other that will except your penetrator.   This way you have water pushing against the penetrator with air on the opposite side of the penetrator.  So long story, but try to find a double acting cylinder, either screw on top or tie rod type  with four long bolts is also fine.   Easy to do with no welding or machining.Hank

  On Saturday, November 14, 2015 10:26 PM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Adam / Hank,received Adam.Hank how does your hydraulic cylinder test chamber work?Have you left the piston & rod in it extended & then pressurize the cylinder with the piston?Do you fill your pressure chamber with water?Any details appreciated.ThanksAlan
      From: Adam via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Sunday, November 15, 2015 4:42 PM
 Subject: Re: [PSUBS-MAILIST] Pressure Test Chamber

Test
On Sat, Nov 14, 2015 at 9:08 PM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Hank,that sounds a really good idea.Will have a look for something suitable during the week.Cheers Alan
      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Sunday, November 15, 2015 2:37 PM
 Subject: Re: [PSUBS-MAILIST] Pressure Test Chamber

Alan,Just buy a hydraulic cylinder, works a charm and there is no welding plus it is rated.Hank 

  On Saturday, November 14, 2015 6:13 PM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Thanks Hugh,I am making up 8 lights (including navigational) & their connectors+ thruster through hulls so will have a minimum of 29 items to test.It would probably pay for me to have my own.Do you want to sell your stuff? Otherwise I was going to head to apipe manufacturer & see what bits I could pick up.Cheers Alan
      From: Hugh Fulton via Personal_Submersibles <personal_submersibles at psubs.org>
 To: 'Personal Submersibles General Discussion' <personal_submersibles at psubs.org> 
 Sent: Sunday, November 15, 2015 10:08 AM
 Subject: Re: [PSUBS-MAILIST] Pressure Test Chamber

Alan,I have a deal for you.I have the cylinder, pump and gauges but need the flanges made etc.You can use it whenever but I get to keep it.Hugh    

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Alan James via Personal_Submersibles
Sent: Saturday, 14 November 2015 5:37 p.m.
To: Personal Submersibles General Discussion
Subject: [PSUBS-MAILIST] Pressure Test Chamber  Hi all,I need to find or make a test chamber a minimumof around 6" internal diameter & about 12" high.I could go a lot larger than that if something was suitable.I don't need to test above 400 psi.Anything off the shelf that I could cannibalize?Or any ideas on construction.Cheers Alan
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