Methods for aligning pipes and connecting the lined pipe with adjacent or lateral pipes
View Patent ↗A deformed thermoplastic liner is drawn through a cut host pipe and split sleeve halves attached to it and then reformed to its cylindrical configuration using pressurized steam. The split sleeve halves are removed, and an adapter flange is fused onto a cut end of the liner portion. The split sleeves halves are then re-attached with the adapter flange between bolted flanges of the split sleeve halves and a section welded to the adjacent host pipe to provide a permanent pressure sealed connection. The lined host pipe can also be connected to a lateral pipe using a lateral extension fused to the rerounded liner and a third split sleeve half with a lateral pipe extension that receives the lateral extension and is attached to the lateral pipe, either directly, or through a second split sleeve.
1. A method of lining a host pipe having a cylindrical cross-section and connecting the lined host pipe with a lateral pipe, comprising the steps of:
(a) removing an intermediate section of the host pipe at a location in general registration with the lateral pipe, thereby leaving spaced apart opposed ends of the host pipe;
(b) removing an end portion of the lateral pipe and forming a connecting end on the remaining portion of the lateral pipe;
(c) securing a split sleeve to the opposed ends of the host pipe to form a continuation of the host pipe, the split sleeve including first and second longitudinally extending halves;
(d) inserting a thermoplastic liner having a non-cylindrical cross-section into the host pipe and split sleeve;
(e) reforming the liner within the host pipe and split sleeve to generally conform the liner to the inner diameter of the cylindrical host pipe and the inner diameter of the split sleeve;
(f) removing at least one of the first and second split sleeve halves thereby generally registering a side portion of the reformed liner and the connecting end of the lateral pipe with one another;
(g) fusing a thermoplastic pipe section to the registering side portion of the reformed liner;
(h) forming an opening in the registering side portion of the reformed liner so that the liner is in communication with the pipe section fused to the liner;
(i) securing a third split sleeve half and one of the first and second split sleeve halves between the opposed ends of the host pipe, whereby the third split sleeve half is overlying the registering side portion of the reformed liner, the third split sleeve half having a lateral pipe extension receiving the thermoplastic pipe section fused to the liner;
(j) providing a first flange on a distal end of the fused pipe section;
(k) coupling the lateral pipe extension to the connecting end of the lateral pipe.
2. The method according to claim 1 , wherein the first flange is provided on the distal end of the fused pipe section by the terminus of the fused pipe section being cut and flared to form the first flange.
3. The method according to claim 2 , wherein the lateral pipe extension is coupled to the connecting end of the lateral pipe by the lateral pipe extension being secured to the connecting end of the lateral pipe with the first flange between the lateral pipe extension and the lateral pipe.
4. The method according to claim 3 , wherein the lateral pipe extension is terminated in a second flange, and wherein the first flange is formed to be in axial abutment against the second flange.
5. The method according to claim 4 , wherein the first flange is in axial abutment against an end face of the second flange and radially within a bolt circle of the second flange.
6. The method according to claim 5 , wherein and the connecting end of the lateral pipe is terminated in a third flange, and wherein the second flange of the lateral pipe extension is bolted to the third flange of the connecting end of the lateral pipe with the first flange between the second and third flanges.
7. The method according to claim 4 including the further step of sealing the first flange of the fused pipe section and the second flange of the lateral pipe extension to one another.
8. The method according to claim 1 wherein step (i) includes securing the third split sleeve half and another of the first or second split sleeve halves to one another to form a permanent connection between the spaced opposed ends of the host pipe and about the liner passing through the host pipe.
9. The method according to claim 1 , wherein the first flange is provided on the distal end of the fused pipe section by cutting the fused pipe section and fusing to the end of the cut fused pipe section a thermoplastic flange adapter having the first flange on one end thereof.
10. The method according to claim 9 including the further steps of:
(l) securing a second split sleeve to the lateral pipe extension and about the fused pipe section; and
(m) securing the connecting end of the lateral pipe extension to the second split sleeve with the pipe section flange between the lateral pipe extension and the second split sleeve.
11. The method according to claim 10 , wherein the lateral pipe extension is terminated in a second flange, the connecting end of the lateral pipe is terminated in a third flange, and the second split sleeve's ends terminate in fourth and fifth flanges, and wherein the second flange of the lateral pipe extension and the third flange of the connecting end of the lateral pipe are bolted to the fourth and fifth flanges of the second split sleeve.
12. The method according to claim 10 including the further step of sealing the flange of the fused pipe section between the second split sleeve and the connecting end of the lateral pipe to one another.
13. The method according to claim 1 wherein step (i) includes securing the third split sleeve half and another of the first or second split sleeve halves to one another to form a permanent connection between the spaced opposed ends of the host pipe and about the liner passing through the host pipe.
14. A method of lining a host pipe having a cylindrical cross-section and re-connecting the lined host pipe with a lateral pipe connected to the host pipe prior to the lining of the host pipe, the method comprising the steps of:
(a) removing an intermediate section of the host pipe at a location including a section of the lateral pipe, thereby leaving spaced apart opposed ends of the host pipe;
(b) removing with the intermediate section of the host pipe that portion of the lateral pipe connected to the host pipe, and forming a connecting end on the remaining portion of the lateral pipe;
(c) securing a split sleeve to the opposed ends of the host pipe to form a continuation of the host pipe, the split sleeve including a first and second longitudinally extending halves;
(d) inserting a thermoplastic liner having a non-cylindrical cross-section into the host pipe and split sleeve;
(e) reforming the liner within the host pipe and split sleeve to generally conform the liner to the inner diameter of the cylindrical host pipe and the inner diameter of the split sleeve;
(f) removing the first and second split sleeve halves to thereby expose the reformed liner;
(g) fusing a thermoplastic pipe section to a side portion of the reformed liner so that the thermoplastic pipe section is in general registration with the connecting end of the lateral pipe;
(h) forming an opening in the reformed liner so that the liner is in communication with the pipe section fused to the liner;
(i) securing a third split sleeve half and one of the first and second split sleeve halves between the opposed ends of the host pipe, whereby the third split sleeve half is overlying the side portion of the reformed liner to which the thermoplastic pipe section is fused, the third split sleeve half having a lateral pipe extension receiving the thermoplastic pipe section fused to the liner;
(j) providing a first flange on a distal end of the fused pipe section;
(k) coupling the lateral pipe extension to the connecting end of the lateral pipe.
15. The method according to claim 14 , wherein the first flange is provided on the distal end of the fused pipe section by the terminus of the fused pipe section being cut and flared to form the first flange.
16. The method according to claim 15 , wherein the lateral pipe extension is coupled to the connecting end of the lateral pipe by the lateral pipe extension being secured to the connecting end of the lateral pipe with the first flange between the lateral pipe extension and the lateral pipe.
17. The method according to claim 14 , wherein the first flange is provided on the distal end of the fused pipe section by cutting the fused pipe section and fusing to the end of the cut fused pipe section a thermoplastic flange adapter having the first flange on one end thereof.
18. The method according to claim 17 including the further steps of:
(l) securing a second split sleeve to the lateral pipe extension and about the fused pipe section; and
(m) securing the connecting end of the lateral pipe to the second split sleeve with the pipe section flange between the lateral pipe and the second split sleeve.