[PSUBS-MAILIST] gasket test results

[hank pronk via Personal_Submersibles]

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