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Descripción: Procedure
Two points added (1.00.00 & 2.00.00) * Storage - a) Coating primer b) Self adhesive anti corrosion tape
* Materials - All types of coal tar wrapping tape to be used as per approved list of Reliance.
IS 10221 :2008
1. Before adhering the tape to the pipe, it is suggested to gently heat the primed pipe by a run of LPG Torch 2.Overlap should be a minimum of 12.5 mm
IS 10221 :2008 Voltage to be applied shall be as per holiday test equipment manufacturer’s recommendation (standard practice is 5KV per mm if coating thickness)
2.02.00 Pipe Coat Wrapping * The tape rolls to be taken out of the packing boxes and leave in the sun for at least 30 min before application. The tape can be hot applied using a suitable and compatible primer. * The tape is slightly warmed on the side containing more coating compound with either a blow lamp or a gas flame to soften the coating compound. Care shall however be taken to ensure that the compound does not melt. The tape shall then be applied. The adhesion test shall be carried out only after minimum 72 h of curing time. * If the tape is being applied in cold weather, the surface of the pipe shall be preheated until it is warm to the touch and the traces of moisture are also removed
VI) Tape Coating of Weld Joints * The tape is applied over the weld joints after the necessary welding and testing of the joints are completed. * The procedure for application of tape shall be same as bare pipe procedure. * Overlaps on each side of the weld joints of pipe ends shall be 50 mm
IS 10221 :2008
6.0 Reference Standard 7.0 Record
IS 10221 : 2008, IS 15337 :2003 Wrapping and Coating Inspection Report.
8.0 Handling, Transportation And Storage of Coated Pipes 9.0 In case of any conflict between this procedure and Contract Specification requirements, the later shall govern.
