Development direction of long-distance pipeline drying - vacuum drying technology
Pipeline drying is an innovative technology that has gained attention globally in recent years. Traditionally, natural gas long-distance pipelines have relied on methods such as desiccant drying, flowing gas evaporation, and vacuum drying to remove moisture. Each of these techniques has its own advantages and limitations, but the need for effective and efficient drying remains crucial.
Why is it important to dry newly constructed pipelines? After a pressure test using water or gas, residual moisture often remains inside the pipeline. This moisture can mix with acidic compounds present in natural gas, leading to the formation of hydrates—viscous crystalline deposits that can block the pipeline over time. To prevent this, pipeline drying is essential to ensure long-term operational efficiency and safety.
Vacuum drying is one of the most effective methods currently used. It involves sealing a section of the pipeline and using a vacuum pump to reduce the internal pressure. When the pressure drops to the level of the saturated vapor pressure at the pipeline’s temperature, any remaining liquid water begins to evaporate. The resulting water vapor is then removed by the vacuum pump, effectively drying the pipeline. This process typically includes steps like deep drainage, decompression, evaporation, and continued vacuuming to ensure complete moisture removal.
The Pipeline Bureau has successfully applied vacuum drying in several major projects, including those in western Libya and the natural gas pipeline projects in Zhuhai and Zhongshan. This method is praised for its environmental friendliness, reliability, and fast execution—often completing in just 4 to 5 days. It also offers a wide range of applications, thorough drying, and no leftover moisture in hard-to-reach areas. As a result, vacuum drying is becoming the preferred choice for long-distance pipeline projects in China and is considered a key trend in the industry.
Stainless Steel Screen,Perforated Stainless Steel Screen,Stainless Steel Screen Door,Stainless Steel Screen Bunnings
glorybest industry co.,ltd , https://www.hbglorybest.com