Abstract: Through series of procedure such as pigging, ball passing, caliper measure, water injection, pressure testing and drainage, the tests on the ultimate bearing capacity of self-produced seamless tube in project of pulp pipeline of Baotou Iron and Steel Corporation are carried out. The results indicate that the tube stock and the welded junction can satisfy with the requirement of working pressure and yielding strength, and especially can meet the required value of maximum transient pressure. It can ensure the operation of pipeline to be safety. 

Key words: Pulp pipeline, Seamless steel tube, Pressure test, Maximum transient pressure