Secondary containment system for pipelines

A method of construction for a pipeline transmission system formed of connected pipe sections having a secondary containment structure bonded to the outer surfaces of the pipe sections with sufficient resistance to chemical corrosion, abrasion, and impact:

• said pipeline transmission system including a pipeline for conveying various fluids therethrough, a multi-ply fabric in external covering relation with an outer surface of said pipeline, said multi-ply fabric having a first layer bonded to said pipeline outer surface and a second layer spaced from said first layer thereby forming an interstitial secondary containment space between said first and second layers, said second layer having a coating of cured resin for providing resistance to impact, abrasion, and chemically induced corrosion and deterioration;
• said method of construction comprising the steps of:
• (1) preparing the outer surface of said pipeline to provide a suitable substrate for application of an epoxy bonded secondary containment system;
• (2) initial lay-out, measuring, and cutting of a multi-ply fabric, said multi-ply fabric including an upper fabric layer and a lower fabric layer which layers are connected by a plurality of pile threads;
• (3) application of a curable liquid resin to an outer surface of section of pipe;
• (4) application of multi-ply fabric sections into the wet epoxy film using roller to remove entrapped air;
• (5) application of an additional coating of epoxy resin to ensure complete saturation, whereby curing of the resin results in the separation of the upper and lower fabric to form an interstitial space therebetween;
• (6) application of a layer of impact and chemically resistant resin to form an outer shell.