Patent ID: 11906078
Assignee: POLYFLOW LLC
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 13:
14. A method of joining two sections of multilayer polymer pipe, the method comprising:
providing a surface of an insert with an adhesive coating;
locating a first end of the adhesive coated insert within an end region of a first section of multilayer polymer pipe, the adhesive being positioned internal to the end region of the first section of the multilayer polymer pipe, and locating a second end of the adhesive coated insert within an end region of a second section of multilayer polymer pipe, the adhesive being positioned internal to the end region of the second section of the multilayer polymer pipe, such that the adhesive seals an annular gap between the insert and the end regions; and
joining the first and second sections of multilayer polymer pipe together using an external coupler positioned over the end regions, the external coupler being an electrofusion coupler configured to bond to a first outer surface of the end region of the first section of the multilayer polymer pipe and to a second outer surface of the end region of the second section of the multilayer polymer pipe,
wherein the joining of the first and second sections is sufficient to transport or distribute an oilfield fluid at an internal pressure of up to 3000 psi, and
wherein the first section of the multilayer polymer pipe and the second section of the multilayer polymer pipe each comprise an inner layer comprising a chemical barrier layer and an outer layer comprising a structural support layer.