PIGGING The main reasons for launching the ‘pig’ are: 1) To clean the piping by removing any wax deposits on the pipeline wall. This will eliminate blockages or pressure-drops in the pipeline. 2) To clear any sand or sludge that may have accumulated in the pipeline. 3) To remove any water that may have collected in low points along the line. This water can cause serious corrosion problems if left in the line. 4) Pigs can also provide separation of products transferred along the pipeline. 5) A special pig trap, constructed like the launching barrel, is installed downstream from the oil pipeline to recover the pigs. BATCH SEP AERATION USING A RUBBER SPHERE 1