Roanoke, VA
This Digester Upgrade and Rehabilitation Project consisted of upgrades to the primary digesters including demolition and replacement of three concrete covers, minor concrete repairs, new mixing systems, new instrumentation, piping and valving modification and improvements to the digester control system. Enroughty partnered with MEB and the Sherwin Williams Company to apply 100% solids, elastomeric, aromatic polyurethane to provide optimal build properties and elasticity. The required coating was applied at 120 mils thickness in single coat using Plural Component Spray Technology.
What are Plural Component Coatings??
Plural component coatings are made up of separate elements that are mixed at the spray gun versus the pump. Parts A and B of the coating system are heated separately to a desired temperature to reduce their viscosity. Once the desired temperature and viscosity are reached, the components are sent toward a spray gun in the desired proportion, known as the flow rate. The components are mixed at a mixing block immediately before atomizing at the gun. This technology was vital to this project because Enroughty applicators were able to apply 120 mils in a single coat saving labor cost and ruling out the possibility of inter-coat contamination or adhesion issues between coats with a traditional paint system.
For confined space projects in particular the added safety benefits of plural component coatings outweigh the upfront material cost. Sherwin Williams Polycote 115 is 100% solids and emits little to no solvents during the application process therefore the risk of accumulation of explosive VOCs is eliminated
