bids are invited for supply of scraper traper supply of 20 inch x inch 300 class scraper receiver , supply of 18 inch x inch 300 class scraper launcher , pig signallers non intrusive type to be mounted on inch pipeline , pig signallers intrusive type to be mounted on scraper launcher receiver minor barrel , door seal for qoec for above item 1 and 2 of sor 1 nos each for scrapper launcher and receiver note supply includes qoec spares required for 2 year operational maintenance. , complete set of spare seals for pig signalers for above item 3 and 4 of sor 1 sets per pig signaller note supply includes signaller spares required for 2 year operational maintenance , jib crane total quantity : 14