| 摘要 |
A coupling for tubings or casings having internal corrosion resistant coatings comprises a pair of tubular members having upset ends, together with outer reference shoulders and threaded regions including low profile, shallow taper threads. A collar of a length related to the reference shoulder positions is engaged against both, and in such positions the ends of the tubular members compress opposite sides of an elastomeric seal that is fitted over an integral central ring in the collar, and that is engaged by side tapers at the nose ends of the tubular members. The seal conforms to the nose ends in a fashion that insures continuity in the corrosion resistant coating while also providing a barrier against electrolytic action.
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