包括低碳能源在内的石油天然气工业 酸性环境下钢质管线管抗开裂性能评价的全环椭圆化试验方法

[中文适用范围]： 本文件提供了一种确定钢管在酸性环境中抗开裂性的方法。该测试方法采用全尺寸测试样本，该样本由一小段管子（“全环”）组成，两端密封以容纳酸性测试环境。该测试方法适用于任何管道；无缝、纵向焊接（有或无填料）、螺旋焊接和管道之间的环焊缝。注 1 样本通常是管道，但也可以由法兰颈或弯头部分或其他管状部件或上述组合组成。注 2 该测试方法也可用于耐腐蚀合金 (CRA)。该方法利用机械载荷的椭圆化在测试样本内表面的两个直径相对位置产生等于目标环向应力的周向应力。然后将测试样本单面暴露于酸性测试环境。注 3 该测试还允许测量氢渗透率。 [外文原描述]： This document gives a method for determining the resistance to cracking of steel pipes in sour service. This test method employs a full-scale test specimen consisting of a short length of pipe (a ‘full ring’), sealed at each end to contain the sour test environment within. The test method applies to any pipe; seamless, longitudinally welded (with or without filler), helical welded, and to girth welds between pipes. NOTE 1 The specimen is usually a pipe but can also consist of flange neck or section of a bend, or other tubular component or a combination of the above. NOTE 2 This test method can also be used for corrosion resistant alloys (CRAs). The method utilizes ovalization by mechanical loading to produce a circumferential stress, equal to the target hoop stress, at two diametrically opposite locations on the inside surface of the test specimen. The test specimen is then subjected to single sided exposure to the sour test environment. NOTE 3 The test also allows measurement of hydrogen permeation rates.