Pressure Testing Requirement for Hilly Trunk Pipeline

The pressure testing of trunk pipeline is very important in the construction of long-distance pipeline, especially for the hilly trunk pipeline. Due to the variation of elevation difference, the value of test strength of pipeline to be taken should not be in accordance with that of common pipeline. The pressure testing method for trunk pipeline adopted in Korla-Shanshan oil pipeline is introduced. The authors consider that the pipe section to be tested should be divided according to the span of block valve of pipeline, neither the pump station interval nor whole line; the annular welded seam between pipe sections should be 100 % X-ray inspected to ensure safety; and water has to be as a test medium, neither air nor gas, the defects such as holiday or pinhole can be found.