Method, apparatus and system for lining conduits
View Patent ↗A method for inverting a tubular liner in a hollow conduit involves: forming a cuff from the tubular liner, the cuff having an opening through which the liner is fed; and while feeding the liner through the cuff opening, feeding a gas under pressure through a gas inlet port formed in the liner to a space between the cuff and the remainder of the liner, thereby causing inversion and inflation of the liner into and through the conduit. After a portion of the liner has been inverted in the conduit, a region of the cuff and liner upstream of the gas inlet port is sealed off, thereby causing inversion of the remainder of the liner in the conduit. Optionally, before a trailing end of the liner is fed through the opening of the cuff, the trailing end is sealed to prevent flow of gas therefrom. When the liner is intended to line the conduit, the liner resin-impregnated either outside or in the conduit and, after complete inversion of the liner in the conduit, the resin is cured and the ends of the liner are sealed to the inside surfaces of the conduit. An apparatus and system for conducting the method are also provided.
1. A method for inverting a liner in a passageway, the method comprising:
inverting a liner from an apparatus disposed outside of a passageway, the liner having a first end disposed upstream the apparatus and a second end disposed downstream the apparatus, the second end being inside-out;
attaching a connector to the liner between the first and second ends of the liner and outside of the passageway;
supplying one or more of air or fluid through the connector, thereby pushing the second end of the liner through a first access point of the passageway;
adjusting an opening of the apparatus, which can slow or speed up inverting the liner through and into the passageway;
bringing together members disposed on either side of the liner, sealing off any loss of one or more of air or fluid through the connector upstream the connector;
pushing the liner through the passageway to a second access point of the passageway;
positioning a control valve and a hose at the second access point of the passageway;
attaching the hose to the second end of the liner disposed within the passageway below the second access point; and
restricting the flow of one or more of air or fluid through the liner via the control valve after inversion of the liner has been completed.
2. The method of claim 1 , further comprising curing the liner when the volume of the liner reaches a pressure required to keep the liner tight against inside walls of the passageway.
3. The method of claim 1 , wherein bringing together members comprises bringing together members when the liner is disposed at a halfway point between the first access point and the second access point of the passageway.
4. The method of claim 1 , wherein pushing the liner through the passageway to the second access point includes pushing the liner along the length of the passageway between the first and second access points.
5. The method of claim 1 , wherein attaching the hose to the second end of the liner comprises providing a seal between the second end of the liner and the control valve.
6. A method for inverting a liner in a passageway comprising:
inverting a liner from an apparatus disposed outside of a passageway;
attaching a connector to the liner outside of the passageway;
supplying one or more of air or fluid through the connector, thereby pushing the liner through a first access point of the passageway;
adjusting an opening of the apparatus, which can slow or speed up inverting the liner through and into the passageway;
pushing the liner through the passageway to a second access point of the passageway;
positioning a control valve and a hose downstream the liner at the second access point of the passageway;
attaching the hose to an end of the liner disposed within the passageway below the second access point; and
restricting the flow of one or more of air or fluid through the liner within the passageway via the control valve after inversion of the liner has been completed.