biennial rate contract for miscellaneous jobs in urea plant at rcf trombay unit , to and fro shifting of pump from plant and workshop and assisting during replacement as per sow ( per pump ) , to and fro shifting of welding machine from the job and workshop ( per trip ) , to and fro shifting of stitching machine from abc plant and workshop ( per machine ) , cleaning of pumps and spares ( per pump ) , assistance on regular maintenance jobs of p-601/602 pumps ( per pump ) , shifting of scrap material to scrap yard from the plant premises ( per trip ) , transfer of material from stores to plant and arrangement of the same in the plant stores or to deliver the same on the jobs ( per trip ) , replacement of dryer cloth ( per time ) , flange tightening upto 600# ( per inch dia )