Method for pretreating the connecting elements of a gas-tight pi

Details Method for pretreating the connecting elements of a gas-tight pi Method for pretreating the connecting elements of a gas-tight pi

1990-04-16

1991-12-03

Niebling, John

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Forming nonelectrolytic coating before depositing...

427239, 285 55, 285 94, C25D 704, B05D 722, F16L 914

Patent

active

050697617

ABSTRACT:
Method for pretreating the connecting elements of a gas-tight pipe connection of the type including an internally threaded coupling for being screwed to externally threaded spigots at pipe ends to be joined, a metallic sealing seat, and an abutment shoulder. Only the coupling, on its innerside, is provided with a covering while leaving the spigots bare. After cleaning threaded and sealing regions of the connecting elements but before screwing together such connecting elements, a lubricant is applied to the cleaned threaded and sealing regions.

REFERENCES:
patent: 4538840 (1985-09-01), DeLange
patent: 4630849 (1986-12-01), Fukui et al.
patent: 4758025 (1988-07-01), Frick
patent: 4871194 (1989-10-01), Kawashima et al.

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