Threaded pipe with surface treatment

Details Threaded pipe with surface treatment Threaded pipe with surface treatment

2005-12-06

2005-12-06

Nicholson, Eric K. (Department: 3679)

Pipe joints or couplings

With casing, lining or protector

Lined

C285S094000, C285S333000, C285S390000

Reexamination Certificate

active

06971681

ABSTRACT:
A threaded metallic pipe for oil extraction industry has a threaded end portion with treated surface in which the metal surface has a roughness (Ra) comprised of 2.0 μm and 6.0 μm, which is covered by a uniform layer (7) of a dry corrosion inhibiting coating and a second uniform layer (8) of dry lubricant coating. Alternatively the layers (8, 9) combined into one uniform layer (9) of a dry corrosion inhibiting coating containing a dispersion of particles of solid lubricant.

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patent: 520538 (1982-02-01), None
patent: 2004/033951 (2004-04-01), None

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