Analysis on the Chap of asphaltic Coating

Asphaltic coating which is widely used in corrosion protection of oil and gas pipeline is a conventional and effective' anti-corrosion structure, but the service life of this structural coating would be greatly reduced when it works at excessive high temperature.In the Puyang Initial Pump Station of Zhong-Luo Pipeline, the large scope of chap occured on the coating of outgoing line, which is used in less than three years.Comparing site investigation with sampling analyzing and experimental tests for all pump stations on the eastern Zhong-Luo Pipeline, and refering to the application records of quality control in constructional is proved that the first cause which the as-phaltic coating ages and chaps advancedly in Puyang Initial Pump Station is that the asphaltic coating has been working at a higher temperature, the second cause is the distortion of pipe occured during the pipe settlement is a influence factor.It is suggested that the application temperature of the modified asphalt should be properly controlled below 60 C, otherwise the service life of asphaltic coating will be reduced.