Pipe joints or couplings – Deformed – Outwardly expanded
Patent
1994-02-15
1995-04-11
Nicholson, Eric K.
Pipe joints or couplings
Deformed
Outwardly expanded
2853822, 285329, 29458, 29520, B21D 3904, F16L 3500
Patent
active
054051762
ABSTRACT:
A relatively impervious mechanical seal is formed between the outer surface of a tube and the inside surface of a mechanical fitting of a high pressure fluid or hydraulic system by applying a very thin soft metal layer onto the outer surface of the hard metal tube and/or inner surface of the hard metal fitting, prior to swaging the fitting onto the tube. The thickness of such thin metal layer is independent of the size of the tube and/or fittings. Many metals and alloys of those metals exhibit the requisite softness, including silver, gold, nickel, tin, platinum, indium, rhodium and cadmium. Suitably, the coating is about 0.0025 millimeters (0.10 mils) in thickness. After swaging, the tube and fitting combination exhibits very low leak rates on the order or 10.sup.-8 cubic centimeters per second or less as meaured using the Helium leak test.
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Anderson Raymond H.
Babel Henry W.
Chickles Colin D.
Fuson Phillip L.
Jones Cherie A.
Goldman Ronald M.
McDonnell Douglas Corporation
Nicholson Eric K.
Scholl John P.
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