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US 5,634,672 AGranted
Flangeless pipe joint
AssigneeThe Dow Chemical Company
InventorsEugene V. Stack, Michael F. Jeglic
Life of this patent
Estimating the term…
Abstract
A flangeless pipe joint including lined pipes with the end section of the outer pipe spaced radially outwardly from the liner and insulating material filling the space between the end sections of pipe and liners. The ends of the liners are sealed to each other and the outer pipe ends are joined by an outer sleeve.
Claims22
A flangeless pipe joint for polymer-lined pipe comprising:
- (a) a first section of pipe in part defined by a first portion having a first inner diameter and a first bulged portion having a first bulged end, the first bulged end having a second inner diameter at the first bulged end, the second inner diameter being greater than the first inner diameter, the first section of pipe being lined with a first polymeric liner having a first polymeric liner end and first outer diameter such that the first outer diameter is at least about 97 percent of the first inner diameter, the first polymeric liner end extending beyond the first bulged end;
- (b) a second section of pipe in part defined by a second portion having a third inner diameter and a second bulged portion having a second bulged end, the second bulged end having a fourth inner diameter, the fourth inner diameter being greater than the third inner diameter, the second section of pipe being lined with a second polymeric liner having a second polymeric liner end and a second outer diameter such that the second outer diameter is at least about 97 percent of the second inner diameter, the second polymeric liner end extending beyond the second bulged end;
- (c) first joining means for joining the first polymeric liner end to the second polymeric liner end whereupon a first annular gap and a second annular gap are created, the first annular gap being defined by the first polymeric liner, the first bulged portion, and the joining means, and the second annular gap being defined by the second polymeric liner, the second bulged portion, and the joining means;
- (d) insulating material substantially filling the first annular gap and the second annular gap;
- (e) an annular collar portion which extends from the first bulged portion to the second bulged portion;
- and
- (f) second joining means for joining the annular collar portion to the first bulged portion and the second bulged portion.
4 more elements
A process for preparing a flangeless pipe joint for polymer-lined pipe comprising:
- (a) providing a first section of pipe in part defined by a first portion having a first inner diameter, the first section of pipe being lined with a first polymeric liner having a first polymeric liner end and a first outer diameter such that the first outer diameter is at least about 97 percent of the first inner diameter;
- (b) bulging the first section of pipe to form a first bulged portion having a first bulged end, the first bulged end having a second inner diameter, the second inner diameter being greater than the first inner diameter;
- (c) cutting the first bulged portion exclusive of the first polymeric liner, whereupon the first polymeric liner end extends beyond the first bulged end;
- (d) providing a second section of pipe in part defined by a second portion having a third inner diameter, the second section of pipe being lined with a second polymeric liner having a second polymeric liner end and a second outer diameter such that the second outer diameter is at least about 97 percent of the third inner diameter;
- (e) bulging the second section of pipe to form a second bulged portion having a second bulged end, the second bulged end having a fourth inner diameter, the fourth inner diameter being greater than the third inner diameter;
- (f) cutting the second bulged portion exclusive of the second polymeric liner, whereupon the second polymeric liner end extends beyond the second bulged end;
- (g) joining the first polymeric liner end to the second polymeric liner end, whereupon a first annular gap and a second annular gap are created, the first annular gap being defined by the first polymeric liner, the first bulged portion, and the joining means, and the second annular gap being defined by the second polymeric liner, the second bulged portion, and the joining means;
- (h) filling the first annular gap and the second annular gap with insulating material;
- (i) providing an annular collar portion which extends from the first bulged portion to the second bulged portion;
- and
- (j) joining the annular collar portion to the first bulged portion and the second bulged portion.
8 more elements
Dependencies are inferred from the claim text.