Method and System of Joining at Least Two Tubular Members

A method of joining at least two polyolefin tubular members, comprising:

• (a) placing the respective ends of the tubular members within a coupler, thereby defining a coupler joint;
• (b) wrapping the respective ends of the tubular members and the coupler joint with a transitional film having a first surface adapted to bond to the tubular members;
• (c) bonding the transitional film to the respective ends of the tubular members;
• and
• (d) applying a reinforcement system over the transitional film comprising applying a fiber-reinforced polyurethane system which bonds to a second side of the transitional film.

A method of joining at least two polyolefin tubular members, comprising:

• (a) placing the respective ends of the tubular members within a coupler, thereby defining a coupler joint;
• (b) wrapping the respective ends of the tubular members and the coupler joint with a transitional film having a first surface adapted to bond to the tubular members;
• (c) bonding the transitional film to the respective ends of the tubular members;
• and
• (d) applying a reinforcement system over the transitional film comprising applying a fiber-reinforced epoxy system which bonds to a second side of the transitional film.

A system at least two polyolefin tubular members joined end-to-end, comprising:

• the at least two tubular members arranged in a coupler such that their respective ends are within the coupler;
• a transitional film applied and bonded to the coupler and at least a portion of the at least two tubular members, the transitional film having a first side and a second side, the first side adapted to bond to polyolefins;
• and
• a reinforcement system, applied over the transitional film, wherein the reinforcement system comprises a fiber-reinforced polyurethane or a fiber-reinforced epoxy system bonded to the second side of the transitional film.