tender for servicing, repairing & overhauling of 245 kv sf-6 circuit breaker at 220 kv s/s sikandra under etd-ii agra - to attend and rectification of sf-6 gas leakage from pole units of 245 kv sf-6 ge make circuit breaker of 220 kv tbc bay at 220 kv s/s sikandra agra.work consist of:-(a) to identify sf-6 gas leakage with the help of sf-6 gas leakage detector.(b) extract sf-6 gas from pole unit by help of gas extraction plant and keep it into empty gas cylinder.(c) dismantle identified pole unit from breaker structure by help of crane.(d) dismantle all components of pole unit and replace all pole o ring/gas kit by applying anabond 661 (gas seal out) after through cleaning of part.(e) re-assemble the pole unit and fill compressed air to check air leakage.(f) erection of pole unit into the structures with the help of crane.(g) apply vacuum and keep it 4/6 hours & check no loss of vacuum.(h) fill sf-6 gs upto specified value.(i) check satisfactorily close/trip operation both by local and remote. 2 to attend and rectification of sf-6 gas leakage from pole units of 245 kv sf-6 abb make circuit breaker of 220 kv agra (4)-sikandra ckt-i at 220 kv s/s sikandra agra.work consist of:-(a) to identify sf-6 gas leakage with the help of sf-6 gas leakage detector.(b) extract sf-6 gas from pole unit by help of gas extraction plant and keep it into empty gas cylinder.(c) dismantle identified pole unit from breaker structure by help of crane.(d) dismantle all components of pole unit and replace all pole o ring/gas kit by applying anabond 661 (gas seal out) after through cleaning of part.(e) re-assemble the pole unit and fill compressed air to check air leakage.(f) erection of pole unit into the structures with the help of crane.(g) apply vacuum and keep it 4/6 hours & check no loss of vacuum.(h) fill sf-6 gs upto specified value.(i) check satisfactorlly close/trip operation both by local and remote.