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Ring Expansion Testing For Oil And Gas Pipelines

机译：石油和天然气管道的环膨胀测试

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Ring expansion testing (aka ring tension testing) is a well established mid-scale test, which allows the linepipe manufacturer and pipeline operator to evaluate yield strength and damage tolerance behavior of steel transmission pipelines1,2,3rnA 76 mm ring is cut from the pipe, sandwiched between two steel platens and pressurized with hydraulic oil, Figures 1 and 2. Yield strength is determined from the relationship between internal pressure and circumferential expansion. Damage tolerance can be assessed by measuring the failure pressure of rings with artificial defects. The test has been designed such that the ring experiences radial expansion only, and no axial loading. Hence, defects across the width of the ring can be regarded as axial defects of infinite length in a pipeline.
机译：环膨胀测试（又名环张力测试）是一项成熟的中规模测试，它使管线管制造商和管道运营商能够评估输油管道1,2,3rn的屈服强度和破损耐受性能从管道上切下一个76 mm的环图1和2夹在两块钢板之间，并用液压油加压。屈服强度由内部压力与周向膨胀之间的关系确定。可以通过测量带有人工缺陷的环的破坏压力来评估损伤容限。该测试的设计使得环仅承受径向膨胀，而无轴向载荷。因此，环的整个宽度上的缺陷都可以视为管道中无限长的轴向缺陷。

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