N--Butterfly Valve Replacement - Blue Mesa Powerplant

The Government is seeking a Contractor to furnish the labor, materials, and equipment for the replacement of two 156-inch diameter butterfly valves and rehabilitation of two 84-inch diameter ring follower gates (RFG) within the Blue Mesa powerhouse, located at the Blue Mesa Powerplant approximately 30 miles east of Montrose, Colorado in Gunnison County. This effort includes, but is not limited to: - Removal and disposal of existing 156-inch diameter butterfly valves, hydraulic operating system, actuators, bypass piping and valves, electrical equipment, concrete pedestals, and appurtenances. - Cutting existing steel penstocks and welding of new pipe spools for connection to new stainless-steel bypass piping and valves. This work includes coating/lining removal and coating/lining re-application. - Supply and design of two reinforced concrete pedestals or re-use of existing reinforced concrete pedestals to adequately support and anchor turbine shutoff valves (TSVs) against normal operating loads, vibration, and earthquake. - Supply and design of one 149-inch diameter ellipsoidal dished head. - Supply, design, installation, and testing of two 149-inch diameter or larger TSVs, actuators, reducing pipe spools, and appurtenant equipment. - Design, fabricate, and install two bypass line access platforms. Bypass line access platform to include ladder, platform, and guardrail. - Supply, design, installation, and testing of one hydraulic operating system capable of operating two 149-inch diameter or larger TSVs, actuators, and appurtenant equipment. - Supply and installation of one 16-inch diameter stainless bypass piping and valves. This work includes cutting into existing steel penstocks and welding of new pipe spools for connection to new stainless-steel bypass piping and valves. An alternative bypass design may be submitted subject to government approval. - Removal and rehabilitation of RFG hydraulic cylinders, leaf bulkheads, and leaf followers. This work includes coating/lining removal and re-application. - Rehabilitation of concrete embedded portion of RFG. This work includes coating/lining removal and re-application. - Removal and replacement of leaking components within the RFG and hydraulic power unit (HPU). This work includes coating application. - Installation and testing of rehabilitated RFG hydraulic cylinders, leaf bulkheads, and leaf followers. - Design and supply a minimum of one blind flange cover to be used in place of the RFG upper bonnet cover. - Provide dewatering facilities as required to collect/divert fixed wheel gate water leakage. - Contractor responsible for draining and filling hydraulic oil. (Government will dispose of oil.) - Commissioning and startup. - Perform testing of existing butterfly valves to determine flow coefficient (Cv).

Division 03 -	Concrete, Cast-in-Place Concrete.
Division 35 -	Waterway and Marine Construction, Waterway and Marine Construction and Equipment, Hydraulic Valves, Hydraulic Butterfly Valves.