Case Studies: Manhole Inspection and Rehabilitation

Case Studies: Manhole Inspection and Rehabilitation

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Concrete manhole brought back up to code using lining system

Problem: Due to deterioration caused by inflow and infiltration, a Kansas City, Missouri, concrete manhole needed rehabilitation.

Solution: A week prior to application, Mongan Painting prepared and repaired the substrate. The concrete was abrasive brush blasted, then pressure cleaned, in accordance with SSPC-SP13/NACE No. 6, “Surface Preparation of Concrete.” Additionally, patch work was completed, and low-pressure water seepage was plugged using Epoxytec’s hydraulic cement, Hydrxx-3, which has a cure time of about three to five minutes. A week later, this clean, sound, and profiled concrete was ready for Epoxytec’s technical service crew to quickly mobilize, alongside Mongan Painting, to line the structure using Series 456 CPP Sprayliner at 200–250 mils. Upon completion, per city requirements, a spark test was completed. The passing results ensured the application was pinhole-free.

Result: This concrete manhole was rehabilitated to like-new condition, with the seamless spray-on application as advertised. The crew was in and out within a day and able to move on to the next needy manhole rehabilitation situation. 877-463-7699;

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;


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