Exhaust and/or condensate port for cured in place liners and installation methods and apparatus
View Patent ↗A process for porting air inflated flexible resin impregnated cured in place liner by pulling without loss of pressure is provided. A selectively openable bulkhead fitting is installed at the pull-in end. The filling may be installed in the end of a pull-in liner; on a porting sleeve or secured to an inflated pulled in or inverted liner. A port is formed through the bulkhead fitting by cutting a hole through the valve assembly. A steam fitting with an exhaust hose is coupled to the bulkhead fitting while maintaining pressure in the inflation bladder. Steam for curing the resin is then introduced into the inversion apparatus to cure the resin and is exhausted through the exhaust hose.
1. A method for trenchless rehabilitation of an existing pipeline from a first access point to a second access point by inserting a flexible resin impregnated liner from the first access point to the second access point and inflating the liner to conform the liner to the existing pipeline and curing the resin in the liner, comprising:
providing a selectively sealable bulkhead fitting with a cap closing the bulkhead fitting mounted to a catch sleeve with an opening through the catch sleeve;
placing the catch sleeve and closed bulkhead fitting at the second access point;
installing the resin impregnated liner in the existing pipeline from the first access point to the second access point and through the catch sleeve at the second access point;
inflating the liner to sealingly engage the catch sleeve about the liner and urging the bulkhead fitting against the inflated liner without deflating the liner;
removing the cap and installing a porting valve and exhaust assembly with a gland for receiving a hole saw shaft on to the bulkhead fitting while maintaining pressure in the interior of the liner;
forming an opening in the liner with the hole saw without allowing the liner to deflate;
closing the valve and removing the hole saw;
installing an exhaust hose on the ported bulkhead exhaust assembly;
introducing steam into the interior of the liner;
opening the valve to allow the steam to flow through the liner and exit through the exhaust hose; and
allowing the resin in the liner to cure.
2. The method of claim 1 , wherein the liner is installed in the existing pipeline by pulling the liner into the existing pipeline and through the catch sleeve, and the liner is inflated with an inverting inflation bladder.
3. A method for trenchless rehabilitation of an existing pipeline from a first access point to a second access point by inserting a flexible resin impregnated tubular liner from the first access point to the second access point and conforming the liner to the existing pipeline and curing the resin in the liner, comprising:
providing a bulkhead fitting mounted on a catch sleeve at the second access point;
inserting the liner from the first access point through the catch sleeve at the second access point so the liner extends into an inlet opening of the catch sleeve and out of an outlet opening of the catch sleeve;
inflating the liner to press against the catch sleeve;
opening the bulkhead fitting and forming an opening in the liner while maintaining pressure in an interior of the liner;
forming a port through the bulkhead fitting through an opening in the catch sleeve which is different from the inlet and outlet openings without allowing the liner to deflate;
installing an exhaust hose on the ported bulkhead fitting;
introducing steam into the interior of the liner and allowing the steam to flow through the liner and exit through the exhaust hose; and
allowing the resin in the liner to cure.
4. The method of claim 3 , wherein the liner is installed in the existing pipeline by pulling the liner into the existing pipeline and through the catch sleeve, and the liner is inflated with an inverting inflation bladder.
5. The method of claim 3 , wherein the liner is installed in the catch sleeve at the second access point by inverting the liner through the catch sleeve.
6. The method of claim 1 , wherein the liner is installed in the catch sleeve at the second access point by inverting the liner through the catch sleeve.
7. The method of claim 1 , wherein the liner is inflated with air.
8. The method of claim 5 , wherein the liner is inflated with air.
9. The method of claim 6 , wherein the liner is inflated with air.