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Metal Face Seal Fitting Field Study
Multi Mate-Demate Record This report details a Multi mate/demate field study at Lawrence Livermore National Laboratory. Over six years in service, this fitting was mate/demated 1557 times and was still working effectively when decommissioned. This evaluation shows the direct cost savings by avoiding the replacement of fittings that no longer passed leak check in this…
Electro Dispersive Spectra (EDS) of a New Gland & One Mating
* taken at the point indicated by the red arrow on the first S.E.M.s After checking the nickel peaks on the bottom EDS we notice much higher nickel reading. This higher signal is from nickel particles that are embedded into the torroid of the gland from the galled nickel gasket during tightening of the fitting….
OmniSafe Flight Qualification
Omnisafe works better than any other fitting for semiconductor applications and has been flight qualified and selected for the following aerospace programs. MSL Mars Rover – launch 2011, for the liquid Freon heat rejection system, Omnisafe 3/8” fittings JPL DAWN – Xenon Ion Propulsion, Asteroid Belt, Oct 2007, Omnisafe 1/8” fittings NASA Evolutionary Xenon…
OmniSafe Particle Study – Stainless Steel Gaskets
Stainless steel gaskets are required in certain gas systems such as carbon monoxide, ozone, and trimethyl arsenic. Because SS gaskets are harder than nickel, the torque induced problems of sealing and galling are amplified. Due to the SS sealing problems, some companies have specified silver plated SS gaskets to reduce friction and galling. Recently these…
Counter Rotational Displacement – Standard VCR vs. OmniSafe
How much rotation is transferred to the components connected by a “VCR type”* metal face seal fitting as it is tightened with a nickel gasket? This data below shows that the relative rotation of the components ranges from 6.7 to 18.2 degrees. This rotation is based on the plating inside the female nut and the…
Non Destructive Multi Mate/Demate Metal Seal Formation
Metal gaskets under compression, along a torroidal interface, exhibit plastic and elastic deformation. The elastic deformation is the “spring back” in the gasket indentation that occurs when the fitting is demated. The plastic deformation is remaining the indentation left in the gasket. The elastic deformation is directly proportional to the plastic indention, (i.e. 10%). As…