Expandable liner for the protection and strengthening of existing pipes
View Patent ↗A method of lining an interior of a pipe in need of repair comprises providing a carrier tube having one or more expandable materials, coating the carrier tube with a binder, securing one or more layers of a fiber-laden material along an exterior surface of the carrier tube with the assistance of the binder. The carrier tube is delivered, together with the at least one layer of the fiber-laden material and the binder, to a targeted location inside a pipe in need of repair. The carrier tube comprises a first diameter while the carrier tube is being delivered to the targeted located inside the pipe in need of repair. The method additionally comprises radially expanding the carrier tube from the first diameter to a second diameter, such that the one or more layers of the fiber-laden material and the binder at least partially contact and/or adhere to an interior wall of the pipe.
1. A method of lining an interior of a section of a pipe with a curable liner extending from a first access point to a second access point, the method comprising:
providing individual bundles of fiber positioned in side-by-side engagement with respect to each other, the individual bundles in side-by-side engagement being stabilized together to form a fiber-laden fabric, the fiber-laden fabric having a length and a width, the individual bundles of fiber stabilized in side-by-side engagement extending along the width of the fiber-laden fabric, the individual bundles of fiber comprising fibers of at least one of carbon, glass, and aramid;
impregnating the fiber-laden fabric with a curable binder;
providing a carrier tube having a length for extending from the first access point to the second access point and having a hoop direction transverse to the length, the carrier tube being configured to remain attached to the fiber-laden fabric after curing of the binder;
positioning the fiber-laden fabric onto the carrier tube by wrapping the fiber-laden fabric around the tube and overlapping longitudinal edge margins of the fiber-laden fabric in the hoop direction of the carrier tube such that the bundles of fiber stabilized in side-by-side engagement extend in the hoop direction of the carrier tube, the overlapped longitudinal edge margins of the fiber-laden fabric extending along the length of the carrier tube, the fiber-laden fabric positioned on the carrier tube having a length for extending from the first access point to the second access point;
pulling the resin impregnated fiber-laden fabric on the carrier tube into the section of pipe such that it extends from the first access point to the second access point;
radially expanding the carrier tube from a first diameter to a second diameter, such that the overlap of longitudinal edge margins of the resin impregnated fiber-laden fabric in the hoop direction of the carrier tube decreases and the resin impregnated fiber-laden fabric contacts an interior wall of the section of pipe when the carrier tube is radially expanded to the second diameter;
while the resin impregnated fiber-laden fabric is in contact with the interior wall of the section of pipe, curing the binder impregnated in the fiber-laden fabric, the carrier tube remaining attached to the cured fiber-laden fabric inside the section of pipe after cure of the binder, thereby providing a cured liner inside the section of pipe extending from the first access point to the second access point.
2. The method of claim 1 , wherein the carrier tube is coated with the binder by positioning the fiber-laden fabric on the carrier tube after the fiber-laden fabric is impregnated with the binder.
3. The method of claim 1 , further comprising routing the carrier tube through a resin saturator before positioning the fiber-laden fabric on the carrier tube.
4. The method of claim 1 , wherein positioning the fiber-laden fabric on the carrier tube comprises pulling the carrier tube across a roll of the fiber-laden fabric and removing the fiber-laden fabric from the roll and wrapping it on the carrier tube at about the same rate as the carrier tube is pulled.
5. The method of claim 1 , wherein the fiber-laden fabric includes individual bundles of fiber extending along the length of the fiber-laden fabric.
6. The method of claim 1 , wherein the fiber-laden fabric includes carbon fiber and glass fiber.
7. The method of claim 1 , wherein the fiber-laden fabric includes at least two layers.
8. The method of claim 7 , wherein the fiber-laden fabric includes a layer comprising carbon fibers and a layer comprising glass fibers.
9. The method of claim 1 , wherein radially expanding the carrier tube from the first diameter to the second diameter comprises pressurizing an interior of the carrier tube by delivering a volume of air or other fluid therein.
10. The method of claim 1 , wherein the binder comprises at least one of a polymeric resin, a thermosetting resin, and a thermoplastic material.
11. The method of claim 1 , further comprising curing the carrier tube simultaneously with curing the binder.
12. The method of claim 1 , wherein the individual bundles of fiber stabilized in side-by-side engagement extending along the width of the fiber-laden fabric are free of needle punching.
13. The method of claim 1 , wherein the fiber-laden fabric is free of needle punching.
14. The method of claim 1 , wherein the fiber-laden fabric includes stabilizing fiber interspersed with the individual bundles of fiber in side-by-side engagement.
15. The method of claim 14 , wherein the stabilizing fiber extends along the length of the fiber-laden fabric.
16. The method of claim 1 , wherein the fiber-laden fabric is impregnated with the curable binder before positioning the fiber-laden fabric on the carrier tube.