Gazovaya promyshlennost’ № 10 2019

To ensure efficient transportation of natural gas through main gas pipelines at their working pressure, it is essential to have reliable data on the dew point temperature. Using moisture content analyzers based on sorption capacitive sensors appears to be promising and economically efficient solution for this issue. However, such sensors’ readings depend significantly on analyzed gas pressure, which makes it difficult to interpret the data obtained. The study examines gas pressure impact on dew point measurement results for two different sorption capacitive sensor models. It is shown that deviation sign of the measured value from the true value depends on material used in moisture-sensitive layer, and the absolute error grows with the pressure increase. A hardware-software method is developed to compensate measurement errors. A method is proposed for consideration of gas pressure impact when using sorption capacitive sensors in commercial gas analyzers.

Natural gas losses when decommissioning the sections of gas pipelines, represent a serious economic and environmental problem. To avoid feed bleeding into the atmosphere, it is appropriate to use mobile compressor stations that enable gas pumping from the area designed for repair or maintenance to the active gas pipeline. Since the equipment available on the market is expensive and does not meet the requirements of Russian suppliers in terms of technical performance, Gazprom transgaz Kazan has set itself the task to design and commission a domestically produced high-performance compressor station, that would be easy to maintain and have low cost price. The article describes the authors’ research and design product, which is a gas-turbine-driven mobile compressor station (MCP-MT/GTD = mobile compressor plant, module type, gas-turbine-driven). The design comprises of three blocks, each of them made as a separate transport unit. Modules are interconnected using flexible elements and quick-disconnecting joints. The plant is characterized by small size and high performance. Pumped gas is used as a fuel for the compressor station, which makes MCP-MT/GTD fully autonomous. When designing the equipment, a great attention was given to process automation, and to comfort and safety of the staff. Pilot sample of MCP-MT/GTD has undergone the acceptance test and is recommended by the acceptance board of Gazprom PJSC to be used as a standard for serial production.