First pigging operation before the commissioning of a long-distance natural gas pipeline
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Dear sea friends, I have a question: How is the first line cleaning carried out after the construction of a natural gas long-distance pipeline but before it is put into use? ” The information I found says to use the ball-cleaning method? But one thing I don’t understand: ball cleaning requires a pressure difference. If there is no pressure difference in pipes that are not in use, then how can ball cleaning be carried out? Does anyone have any design specifications or materials on this topic? Could you share them?
Ball cleaning is indeed commonly used for the first line cleaning before the commissioning of long-distance natural gas pipelines. Ball cleaning is typically carried out by sending a cleaning ball, using gas pressure to propel it through the pipeline in order to remove impurities and moisture from within it. In pipelines that are not yet in service, due to the lack of sufficient pressure difference, pig removal can be accomplished in the following manner: 1. **Gas filling**: Compressed air or other gases can first be used to fill the pipeline, creating a certain level of pressure to facilitate pig removal. 2. **Low-pressure cleaning**: A low-pressure pump is used to push cleaning balls into the pipes, with the liquid medium (such as water or other solvents) being utilized for cleaning. Regarding design specifications and documents, it is recommended to consult relevant industry standards, such as the \"Code for Natural Gas Transmission Pipeline Projects\", which typically provide specific requirements and methods for pipeline cleaning. At the same time, you can also consult some professional books or literature to obtain more detailed data and technical details. .