survey , study , design , detail engineering , supply of materials , supervision for execution erection and commissioning assistance of condensate recovery system from steam tracing of offsite and new units at iocl guwahati refinery , survey , study , design , detail engineering , manufactuing and supply of condensate recovery system as per tender details . , per diem site supervision charges for erection and commissioning , overtime charges of site supervision on woking days , overtime charges of site supervision on offday/ holiday ( as per refinery ) , travel expense ( not to be quoted by the bidder , since the charge is fixed )