The galvanized pipes manufactured at Baramati Plant are highly corrosion resistant and can be used safely both in underground and overhead lines for conveying of liquids, gases, etc. The finished black pipes are galvanized as per IS Specification number IS- 4736/86. The process of galvanizing may briefly be described as follows: Black pipes are inspected visually for surface defects and straightness. If the pipes are found to be OK they are subjected to de- greasing in an alkaline solution. The de- greased pipes are rinsed in a flowing water tank to remove excess de- greasing solution both from inside and outside the pipes. The pipes are then transferred to a pickling tank with Hydrochloric acid of 18-20% strength at room temperature, when the pipe gets de- scaled. In order to get rid of excess acid inside and outside of the pipes, they are transferred to a rinsing tank with flowing water. The next step is to move this pipes to a pre- fluxing bath, where a thin coating of flux consisting of a compound of Zinc chloride, aluminium chloride and certain additives, gets applied. The pipes are then dried on the feeding table wit h the help of hot air at about 120 deg centigrade. Each galvanized and chromated pipe is inspected on the Inspection table, for black spots, rough coating, poor finish etc. Such defective pipes are manually separated out and goo pipes are stored in the collection pocket, where from, they are transferred to the threading section. Most customers desire galvanized pipes to be threaded, and accordingly they are threaded as per IS- 554:1985. A galvanized socket at one end and a plastic protective ring at the other end are provided to prevent transit damage. The pipes are duly branded, packed, marked and tagged with all details and made ready for dispatch.