Circulating Water PCCP Repair
Circulating Water PCCP Repair
Projects
Project Highlights
- 800 linear feet of a 10-ft diameter PCCP were strengthened with Carbon FRP
- 27,000 sq. ft. of a specially designed carbon fabric was used. This allowed the pipe to be strengthened with only a single layer of fabric
- All equipment was re-designed so that it could fit into the pipe through the 30-inch diameter manhole
- Strengthening was completed ahead of schedule
The Project In Pictures
The Problem
50% of pre-stressing steel wires necessary to handle internal pressure of the pipe had corroded and snapped. This resulted in cracking and structural degradation to the PCCP. Over 800 linear feet of pipe required repair.
The Fix
Next completed surface preparation with abrasive blast, repaired damage to inner layer of concrete, installed two layers of CFRP, accelerated the cure, and completed termination details, to ensure a long lasting repair.
The Result
The repair was competed on 800 linear feet of 10-foot diameter PCCP during a planned ten-day outage. Carbon fiber provided sufficient hoop strength to withstand the internal pipe pressures.
Approximate cost savings: 50% over replacement of PCCP.
