Gate Cylinder Repairs at Black Rock Lake located in Thomaston, Connecticut

There are two hydraulically operated gates located in the Intake Tower at Black Rock Dam. The dam and its operating equipment are approximately 55 years old. Hydraulic fluid leaks from the stem packings have become a continuous issue that are the primary focus of this project. The gate stems and extension rods are also showing signs of wear which shall be addressed as part of the overall refurbishment effort. A summary of the overall scope of work for the gate assemblies includes:? Refurbish both hydraulic cylinders located in the gate chamber. Refurbish hydraulic cylinders, gate leaf stems, and stem extension rods. Refurbish existing packing seats and glands and replace all packings. Replace all gate stem oil and water packings and gate stem extension oil packings. Replace all cylinder gaskets and stem o-rings. Test existing hydraulic fluid to perform a thorough analysis of the condition of the fluid. ? All existing components listed to be refurbished and reused shall be thoroughly cleaned and have visual inspections/assessments conducted. ? Remove the middle piston ring on both pistons and replace with a new hydrolysis resistant polyurethane (HPU) piston seal manufactured to operate within specified hydraulic fluid type, pressures, and temperatures. See Amendment 0001 for site visit information