[PSUBS-MAILIST] gasket test results

[hank pronk via Personal_Submersibles]

Rick,
I will just back my trailer into the water and float the barge off.  I put pipes under the tanks and she rolls right off.
I have subcon  penetrators that have an o-ring that tightens to a flat surface (squeezed) much like an ORB hydraulic fitting.  I just hand tighten them to I would guess 30 ft lbs.  If your in doubt, make a pressure test fixture.  I test everything under full pressure.  Dr Phil told me they test all the penetrators because some will fail.  When they sell them, they do random testing not individual testing.
Hank
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On Wed, 7/8/15, Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] gasket test results
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Received: Wednesday, July 8, 2015, 1:22 PM
 
 Good luck
 on your upcoming test Hank. How are you launching your barge
 once it gets there to the dive spot?While on the
 subject of gaskets and 0 rings, I have some subcon and
 blueglobe threw hulls. Sub Subcons of course have an O ring
 that sits in a groove and is screwed into a threaded ss plug
 that is welded into the hull. I have two concerns,1) how do
 I know when to stop tightening it as it won't be able to
 compress with depth and 2) I would think that the O ring
 might distort with the screwing motion as it snugs down. My
 preference would be to drill out the ss threw hull plug so
 that the threaded shaft of the Subcon would just pass threw
 and then put a backing nut on the inside to compress it but
 then the hull plug would have to be in my mind too thin to
 be able to get a nut on it. On the Blueglobes, how do you
 know when it is snugged enough without doing any damage to
 the fitting?
 Rick
 On Wed, Jul 8, 2015 at 2:15
 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 wrote:
 I did my
 testing this morning and found some scary results.  I
 bonded EPDM gasket material to my port test chamber and
 tested a port to 500 psi.  The gasket extruded about 1/16
 of an inch.  When I greased the surface of the gasket and
 pressured it to 500 psi, the gasket extruded 1/2 inch. 
 When the pressure is released the gasket returns to its
 original position.
 
 When the same test is done without bonding, I get the same
 result.
 
 
 
 My next test will be with the bearing surface machined to
 create tiny ridges for traction.
 
 Hank
 
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