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Why do we need to dry the newly constructed pipeline? Because the newly-constructed natural gas pipeline should use water or gas as the pressure test, after the completion of the pressure test, the water and gas will be discharged through the pipeline through the pipeline. However, this method can not guarantee the complete discharge of moisture in the pipeline. Natural gas contains a large amount of acidic compounds. After entering the pipeline, it encounters the residual moisture and forms a viscous crystalline hydrate on the wall of the pipeline. The more the product, the more likely it is that the pipe will become clogged. Pipeline drying technology is the way to solve this problem.
Vacuum drying is to use a vacuum pump to suck the gas in the sealed pipe section. When the pressure is reduced to the saturated steam pressure corresponding to the pipe temperature, the vacuum pump continues to pump the gas out of the pipe section. The liquid water in the pipe section will evaporate and evaporate into water vapor. The water vapor is pumped out by the vacuum pump to achieve the purpose of dewatering and drying the pipeline. It is divided into deep drainage, decompression, evaporation, and vacuuming.
In the pipeline project in western Libya and the natural gas pipeline project in Zhuhai and Zhongshan, the Pipeline Bureau has achieved success with vacuum drying technology. Vacuum drying has the characteristics of environmental protection, reliability, short construction period, etc. It generally takes only 4 to 5 days; it has the advantages of wide application range, thorough drying, and no leftover corners, which is the inevitable trend of domestic long-distance pipeline drying.
Development direction of long-distance pipeline drying - vacuum drying technology
Pipeline drying technology is a new technology emerging in the world in recent years. At present, commonly used drying methods for natural gas long-distance pipelines at home and abroad include desiccant method, flowing gas evaporation method, and vacuum drying method.