bids are invited for custom bid for services - 2223 1045 lumpsum amount for total estimated qty including gst for replacement of flange gasket of steam superheater shell e501 as per sow , custom bid for services - lumpsum amount for total estimated qty including gst ammonia converter spectacle blind opening boxup as per sow , custom bid for services - lumpsum amount for total estimated qty including gst replacement of circumferential flanged joint gasket of distillation column f552 as per sow , custom bid for services - lumpsum amount for total estimated qty including gst opening boxup of primary reformer cold collector manhole covers as per sow , custom bid for services - lumpsum amount for total estimated qty including gst replacement of channel shell as per sow , custom bid for services - lumpsum amount for total estimated qty including gst structural job as per sow , custom bid for services - lumpsum amount for total estimated qty including gst for flange opening and box up to 12 inch as per sow , custom bid for services - lumpsum amount for total estimated qty including gst for pipeline joints fabrication cs as per sow , custom bid for services - lumpsum amount for total estimated qty including gst for dismantling of cs pipeline as per sow , custom bid for services - lumpsum amount for total estimated qty including gst for erection of cs pipeline as per sow , custom bid for services - lumpsum amount for total estimated qty including gst for scaffolding erection and removal as per sow