Corrosion resistant pipe joint
AssigneeDresser Industries, Inc.
InventorRichard L. Chamberlin
Life of this patent
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Abstract
Pipe joint components such as a metallic sleeve and companion nut of a compression-type pipe coupling are externally coated with a corrosion-resistant polymeric plastic. In a preferred embodiment the coating on the female of the components extends as a flexible skirt beyond the mating end face thereof to include an internally integral annular O-ring formation. The coating on the male fitting terminates behind the threads thereof in an annular ramp or boss adapted in assembly to be engaged by the O-ring coating formation of the female fitting. Cooperation of the engaging O-ring and ramp effects a moisture seal relation thereat.
Claims8
In pipe joint forming members including a first metal component having a male thread and a second metal component having a female thread, corrosion protection for the joint adapted to be provided by said components and comprising in combination:
- (a) a first polymeric plastic coating formed about the periphery of said male threaded component and terminating behind the thread thereof;
- (b) a second polymeric plastic coating formed about the periphery of said female threaded component and terminating in an annular flexible skirt extending beyond the joint forming end thereof, said skirt being adapted when said male and female components are threadedly assembled in joint formation to surroundingly overlap a portion of the coating on said male component;
- and
- (c) at least one polymeric plastic annular lip of locally beaded cross-section integrally formed extending radially inward on an opposing surface of at least one of said overlapped skirt or coating thereat;
- (d) said lip being adapted to cooperate with said opposing surface at any longitudinal location along the mutual overlap therebetween in the course of assembling said components to effect a threadlessly compressive sealing engagement enclosing the metal threads of the joint formation.
Dependencies are inferred from the claim text.