@article { author = {Mahmoodi, Mahdi and Gorji, Mofid}, title = {The non-dimensional diagram of automatic line-break control valve performance domain in gas transportation pipeline}, journal = {Iranian Journal of Mechanical Engineering Transactions of ISME}, volume = {19}, number = {2}, pages = {41-59}, year = {2017}, publisher = {ISME}, issn = {2538-4775}, eissn = {}, doi = {}, abstract = {The effects of orifice diameter, pipeline initial pressure and pressure drop rate due to rupture on the differential pressure of diaphragm valve in a automatic line-break control valve have been studied by experiments. The fluid in this experimental investigation was nitrogen. The reference tank is connected to the pipeline through a calibrated orifice with check valve. The tank pressure is higher than pipeline pressure when pressure reduction occurs by line breaking. If the pressure difference between tank and pipeline is higher than the sustainable pressure value of diaphragm valve, the valve will be closed by actuator. The differential pressure of diaphragm valve is increased by the growth of pipeline pressure drop rate. The occurrence time of maximum differential pressure of diaphragm valve just depends on the orifice diameter. The maximum of differential pressure increases with the decrease of orifice diameter. The setting differential pressure of control valve was increased by decrease of pipeline initial pressure or orifice diameter or increase of pressure drop rate. The curves of non-dimensional maximum differential pressure generated by non-dimensional pipeline pressure drop rates are shown for different orifice diameters and pipeline initial pressure. These important curves will be used for design and setting of these automatic line-break control valve operation.}, keywords = {Automatic Control Valve,Gas Line-break,Initial Pressure,Pressure Drop Rate,Non-dimensional Diagram}, title_fa = {دیاگرام بدون‌بُعد دامنه کارکرد شیرهای کنترلی اتوماتیک شکست خط انتقال گاز}, abstract_fa = {شیرهای کنترلی اتوماتیک شکست خط به دلایل متعدد در مناطق صعب العبور و با توجه به نیاز پدافندی غیرعامل یا حفاظت از اکوسیستم روی خطوط انتقال گاز نصب می‌گردند. اثر مشخصه‌های قطر اوریفیس، فشار اولیه خط و نرخ افت فشار شکست خط بر اختلاف فشار تنظیمی شیر بصورت آزمایشگاهی با گاز نیتروژن بررسی شد. با افزایش نرخ افت فشار شکست یا کاهش قطر اوریفیس یا فشار اولیه خط، این اختلاف فشار افزایش می‌یابد. زمان دست‌یابی به اختلاف فشار تنظیمی، تخمین ‌زده شد. دیاگرام اختلاف فشار تنظیمی بدون‌بعد برحسب نرخ افت فشار بدون‌بعد در دامنه کارکرد شیر کنترلی اتوماتیک ارائه شد.}, keywords_fa = {شیر کنترل اتوماتیک,شکست خط گاز,فشار اولیه,نرخ افت فشار,دیاگرام بدون‌بعد}, url = {https://jmep.isme.ir/article_27667.html}, eprint = {https://jmep.isme.ir/article_27667_fde6366d6b9c2d56a7488924123d92e4.pdf} }