Tubular article

A method of covering a substrate, which comprises revolving onto the substrate a double wall tubular article comprising (a) a double wall and (b) a friction-reducing means between the two walls of the double wall and comprising a non-newtonian liquid having a viscosity at a shear rate of 1 reciprocal second that is greater than 5 times the viscosity at a shear rate of 100 reciprocal seconds;

• the article being capable of being applied to said substrate by relative sliding motion between the two walls substantially without relative sliding motion between a wall adjacent the substrate and the substrate.

A method of applying a hollow object around a substrate, which comprises interposing between the object and substrate a double wall tubular article comprising (a) a double wall and (b) a friction-reducing means between the two walls of the double wall and comprising a non-newtonian liquid having a viscosity at a shear rate of 1 reciprocal second that is greater than 5 times the viscosity at a shear rate of 100 reciprocal seconds;

• the article being capable of being applied to a substrate by relative sliding motion between the two walls substantially without relative sliding motion between a wall adjacent the substrate and the substrate.

A method of forming a duct seal between a duct and a substrate that passes therethrough, which comprises revolving along the substrate to a position within the duct an article comprising a double-walled tube that can be continuously revolved along an elongate member by relative sliding motion between the two walls of the double wall, substantially without relative sliding motion between a wall adjacent the member and the member, the double wall tubular article comprising (a) a double wall and (b) a friction-reducing means between the two walls of the double wall and comprising a non-newtonian liquid having a viscosity at a shear rate of 1 reciprocal second that is greater than 5 times the viscosity at a shear rate of 100 reciprocal seconds;

• the article being capable of being applied to the substrate by relative sliding motion between the two walls substantially without relative sliding motion between a wall adjacent the substrate and the substrate.

A method of covering a supply line, which comprises revolving onto the supply line a double wall tubular article comprising (a) a double wall and (b) a friction reducing means between the two walls of the double wall and comprising a non-newtonian liquid having a viscosity at a shear rate of 1 reciprocal second that is greater than 5 times the viscosity at a shear rate of 100 reciprocal seconds;

• the article being capable of being applied to the supply line by relative sliding motion between the two walls substantially without relative sliding motion between a wall adjacent the supply line and the supply line.

A method of environmentally sealing a substrate, which comprises:

• forcing a sealing material against the substrate by revolving over the substrate an article comprising a double-walled tube such that tension within a wall of the tube acts on the sealing material;
• said double-walled tube having a friction-reducing means between the two walls of the double wall and comprising a non-newtonian liquid having a viscosity at a shear rate of 1 reciprocal second that is greater than 5 times the viscosity at a shear rate of 100 reciprocal seconds;
• the article being capable of continuously revolving along an elongate member by relative sliding motion between the two walls of the double wall substantially without relative sliding motion between a wall adjacent the member and the member.