Due to corrosion of reinforcement wires, several sections of a 10-ft/3m-diameter prestressed concrete cylinder pipe in the coal-burning plant required strengthening. Design requirements called for additional strength in both hoop and longitudinal directions. Access to the pipe was available only through a 30-inch/762-mm-diameter manhole. This required redesign and manufacturing of the equipment.
A special PipeWrap carbon fiber fabric was developed for this project to achieve the strengthening requirements with a single layer of fabric -- instead of two layers as called for in the original design. Samples were constructed and tested to demonstrate the feasibility of the solution. Bands of fabric 50 inches/1,270 mm wide were applied in the hoop direction, with a single overlapping joint along the bottom of the pipe. The entire repaired section was coated with a layer of chemical-resistant coating.