notice inviting e-tender for lining up of contract for replacement of hv-1 , hv-2 , hv-3 , hv-5 , lc-2 , bohler and hoerbiger make non return valves in urea plant at rcf thal . , services as per following , replacement of hv-1 as per scope of work ( lumpsum per unit of urea ) , replacement of hv-2 as per scope of work ( lumpsum per unit of urea ) , replacement of hv-3 as per scope of work ( lumpsum per unit of urea ) , replacement of spool piece as per the scope of work ( lumpsum per unit of urea ) , replacement of hv-5 as per scope of work ( lumpsum per unit of urea ) , replacement of lc-2 as per scope of work ( lumpsum per unit of urea ) , replacement of bohler valve as per the scope of work ( lumpsum per unit of urea ) , replacement of hoerbiger valve as per the scope of work ( lumpsum per unit of urea )