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US 5,730,472 AGranted
Flangeless pipe joint and a process for manufacturing such a joint
AssigneeThe Dow Chemical Company
InventorsBrian W. Krause, Michael F. Jeglic, Dennis A. Huggard
Life of this patent
Estimating the term…
Abstract
A flangeless pipe joint for polymer-lined piping in which the piping is joined by a coupling and the lining is slip, loose, interference or swaged fitted into the pipes and joined at the ends thereof against relative movement.
Claims17
In a flangeless pipe joint for polymer-lined pipe having
- (a) a first section of pipe (100) having a first section end (120), said first section of pipe being lined with a first polymeric liner (110) having a first liner end (130) extending from said first section end;
- (b) a second section of pipe (100') having a second section end (120'), said second section of pipe being lined with a second polymeric liner (110') having a second liner end (130') extending from said second section end;
- (c) joining means (140) for joining the first liner end to the second liner end, said joining means serving to restrain linear movement of said first polymeric liner and said second polymeric liner;
- and
- (d) an annular metallic coupling (150) for joining said first section end and said second section end, characterized in that the annular coupling comprises a mechanical coupling retained on said first section of pipe and said second section of pipe by compressive force.
2 more elements
A process for preparing a flangeless pipe joint for polymer-lined pipe comprising:
- (a) providing a first section of pipe (100) lined with a first polymeric liner (110) having a first liner end (130) and a second section of pipe (100') lined with a second polymeric liner (110') having a second liner end (130');
- (b) removing a portion of said first section to expose an annular portion of said first polymeric liner and to form a modified first section having a first section end;
- (c) removing a portion of said second section to expose an annular portion of said second polymeric liner and to form a modified second section having a second section end;
- (d) joining said first liner end and said second liner end with joining means (140), said joining means serving to restrain linear movement of said first polymeric liner and said second polymeric liner;
- and
- (e) providing an annular metallic coupling (150) to join said first section end and said second section end wherein the annular coupling comprises a mechanical coupling which is compressed onto said first section of pipe and said section of pipe such that said first section of pipe and said second section of pipe are decreased in diameter at the points of said compressing.
3 more elements
Dependencies are inferred from the claim text.