0.8设计系数下天然气管道用焊管关键性能指标

Key performance indicators of welded pipe for natural gas pipeline with design factor of 0.8

研究了0.8设计系数下天然气管道用焊管满足断裂控制要求的母材和焊缝韧性指标,评估了钢管100%SMYS水压试验的可行性。对于采用0.8设计系数、直径1219mm、设计压力12MPa的天然气管道,为防止钢管启裂,要求焊缝夏比冲击韧性最小平均值为80J;为满足管道止裂要求,要求钢管母材夏比冲击韧性最小平均值为260J。对管径为1219mm的X80钢管批量生产屈服强度数据的统计分析和评估结果表明:X80钢管进行100%SMYS工厂水压试验是可行的,但需要优选板材和钢管性能稳定的供货商,并严格进行水压试验后的钢管几何尺寸检测。(表4,图5,参6)

Base metal and weld toughness indicator of welded pipe for natural gas pipeline meeting fracture control requirements under the design factor of 0.8 is studied and feasibility of 100% SMYS hydrostatic test for steel pipe is assessed. For the natural gas pipeline with the design factor of 0.8, diameter of 1 219 mm and design pressure of 12 MPa, it is required to reach 80 J of minimum Charpy impact toughness for welding seam to prevent crack initiation. In order to meet pipeline crack arrest requirements, it is required to reach 260 J of minimum Charpy impact toughness for steel. As shown from statistical analysis and assessment results of yield strength data for 1 219 mm X80 steel pipe in mass production, 100% SMYS factory hydrostatic test of X80 steel pipe is feasible, but it is required to select the supplier with stable performance of plate and steel pipe and strictly detect geometric dimensions of steel pipe after the hydrostatic test. （4 Tables, 5 Figures, 6 References）