Abstract:

Flushing liquor contains several kinds of corrosive mediums, such as H2S and so on. They are not main cause of the leakage of flushing liquor pipeline. The combination effect of the various kinds of residual stress and medium corrosion generated of flushing liquor pipeline causes the stress rupture of the pipeline. The stress corrosion by H2S etc. and hydrogen damage are the major cause of flushing liquor pipeline leakage. The welding defect generated or the microcracks developed by stress corrosion on the inner wall of the flushing liquor pipeline can cause the joint corrosion of flushing liquor pipeline. Therefore the use of A302 stainless steel transitional welding rod to ensure welding quality and the effective elimination of various kinds of residual stresses can avoid the leakage of flushing liquor pipeline.