Threaded joint for tubes

Details Threaded joint for tubes Threaded joint for tubes

2005-07-26

2005-07-26

Nicholson, Eric K. (Department: 3679)

Pipe joints or couplings

With lubrication

C285S333000, C285S390000

Reexamination Certificate

active

06921110

ABSTRACT:
Described herein is a threaded joint, in which the threads are coated with a layer of dry lubricant having a thickness of between 5 μm and 30 μm and in which the nominal void volume NVV of the space (6, 7) between the thread of the male tube and the thread of the female tube, is sized by means of the following formulae:NVV⁡[cm3]≤4×OD⁡[inch]NVV⁡[cm3]OD⁡[inch]×Wt⁡[mm]≤1gT≤0.4⁢ ⁢mm2⁢/⁢pitchwhere OD is the nominal outer diameter and Wt is the thickness of the wall of the pipes.

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