Nctps I Semi Circle Aoh 25 26 Tm Dn Replacement Of Defective 450Nb 600Nb Butterfly Valves And Servicing Of Existing 450Nb 600Nb Butterfly Valves Actuators Etc In Unit I Ii Iii During Annual Overhaul Shutdown Period 2025 26 Nctps I Se Mi Circle Turbine Maintenance Division Annual Overhaul Work For The Year 25 26 Specification No 87 25 26