Epoxy used to rehab corroded large-diameter pipe

Problem: The San Jose-Santa Clara Regional Wastewater Facility had 900 feet of 84-inch-diameter pipe with severe crown corrosion. Several areas had extensive concrete spalling with exposed rebar. An assessment estimated the remaining service life of the pipe between 0 and 12 years. A high priority was given to coating the pipe to lengthen its life span.

Solution: Michels Pipeline patched badly deteriorated spots with cementitious material, followed by coating the pipe with Neopoxy high-strength corrosion-resistant NPR-5303 epoxy resin. The project owner decided to line only the top 200 degrees of the pipe due to the more serious corrosion in that area. The Michels crew applied epoxy at a thickness of 150-250 mils using plural component spray equipment.

Result: The project was completed successfully. The coating successfully passed spark and pull testing. Several of the pull test results were over 1,500 psi (project specs required 250 psi minimum), with a clean concrete break rather than a separation of the coating and substrate. The pipes were back in service within a few days. Through the application of the Neopoxy NPR-5303, the life span of the large-diameter pipe was extended by approximately 50 years. 510-782-1290; www.neopoxy.com

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Lining project successfully rehabilitates deteriorated manholes

Problem: In 2020, a project was identified through a Florida-based electric authority’s engineering department for seven severely deteriorated manholes in the area. The initial capital-improvements-funded project called for these manholes to be conventionally excavated and replaced with new structures. Unfortunately, this work would disrupt the local community for at least six months with heavy construction, bypass pumping and rerouting of residents around the construction site.

Solution: Rather than the conventional dig-and-replace method, Florida-based contractor Engineered Spray Solutions concluded that the project was suitable for structural lining using Sprayroq’s SprayWall at various thicknesses.

Result: The clients accepted the proposal noting the tremendous cost savings and minimal disruption to the community. The project was completed on time, on budget and without a single neighborhood complaint. 205-957-0020; www.sprayroq.com