[PSUBS-MAILIST] gasket test results

[hank pronk via Personal_Submersibles]

Also, I was able to do a slide test of the port on the gasket.  At 500 psi with grease the port slides easily.  Without grease, I could not move the port.  To move the port I simply shimmed between the loosened air fitting and the port.  After pressurising the chamber, I simply tightened (threaded in) the air fitting and that pushed the port sideways.
Hank
-------------------------------------------- 
On Wed, 7/8/15, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: [PSUBS-MAILIST] gasket test results
 To: personal_submersibles at psubs.org
 Received: Wednesday, July 8, 2015, 8:15 AM
 
 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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