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首页> 外文会议>International Pipeline Conference >VERIFICATION OF APPLICABILITY OF BATTELLE TWO-CURVE METHOD TO ULTRAHIGH-PRESSURE RICH-GAS PIPELINES BASED ON A FULL-SCALE BURST TEST
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VERIFICATION OF APPLICABILITY OF BATTELLE TWO-CURVE METHOD TO ULTRAHIGH-PRESSURE RICH-GAS PIPELINES BASED ON A FULL-SCALE BURST TEST

机译：基于全规模突发测试验证BATTELLE双曲线法适用于BATTELLE双曲线法对超高压富气管的应用

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A full-scale gas burst test was conducted to confirm the behavior of unstable ductile crack propagation and arrest and to confirm the required toughness value to prevent unstable ductile fracture under an ultrahigh pressure of 18 MPa. A full-scale test was conducted at the Spadeadam test site in the UK for unburied pipes. The test pipes used in this test were of API 5L Grade L450 with outer diameter of 610 mm and thickness of 17.5 mm. The toughness of the test pipes increased away from the center, where an explosive charge was placed across the top of the girth weld for crack initiation. The gas used in the test consisted of ～89% methane and other heavy hydrocarbon gas components, and the test temperature was 0 °C. A gas circulation loop was constructed to ensure that a homogeneous gas mixture and temperature were achieved throughout the test rig. In addition to dynamically measuring the ductile crack velocity and decompression behavior of the rich gas, as has often been done in previous burst tests, the circumferential distribution of the decompression behavior was measured using circumferentially placed pressure transducers. Furthermore, the fracture strain near the propagating crack was measured. The initiated unstable ductile crack was arrested in the third pipe. From the material properties of the test pipes in which the unstable ductile crack was arrested, the required Charpy absorbed energy and DWTT absorbed energy to prevent unstable ductile fracture in unburied pipes were obtained. In addition, the above data can be useful for validating numerical models that evaluate the propagation/arrest of unstable ductile fracture. The required Charpy and DWTT absorbed energy values obtained in this test were compared with those predicted by the Battelle Two-Curve Method (BTCM). As noted in previous studies, it was confirmed that the BTCM underestimates the required Charpy absorbed energy and requires a certain correction factor for precise evaluation, whereas the DWTT absorbed energy predicted by BTCM was consistent with the experimental result.
机译：进行全尺寸气体突发测试以确认不稳定的延展性裂纹传播和停滞的行为，并确认所需的韧性值，以防止在18MPa的超高压下的不稳定延性骨折。在英国的SpadeAdam测试站点进行全规模测试，用于未挤压管道。该试验中使用的测试管是API 5L级L450，外径为610mm，厚度为17.5mm。测试管的韧性远离中心增加，其中爆炸性充电放在周围焊缝顶部以进行裂纹启动。测试中使用的气体由〜89％的甲烷和其他重烃气体组分组成，测试温度为0℃。构造气体循环回路以确保在整个试验台中实现均匀的气体混合物和温度。除了动态测量富燃气的延性裂纹速度和减压行为之外，如前所述在先前的突发测试中，使用圆周放置的压力换能器测量减压行为的周向分布。此外，测量传播裂纹附近的断裂菌株。引发的不稳定延性裂缝在第三管中被捕。从测试管的材料特性被阻止，获得所需的夏比吸收能量和DWTT吸收能量以防止在未挤压的管子中防止不稳定的延展性骨折。此外，上述数据对于验证评估不稳定延性骨折的传播/捕捉的数值模型非常有用。将在该测试中获得的所需的夏比和DWTT吸收能量值与Battelle双曲线方法（BTCM）预测的那些进行比较。如前所述，证实，BTCM低估了所需的夏比吸收能量，并且需要一定的校正因子进行精确评估，而BTCM预测的DWTT吸收能量与实验结果一致。

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