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3.1 一般要求3.1.1 尺寸。应供应16至144英寸管径的管子,或按规定供应更大尺寸的管子。3.1.2 最小管节长度。除因重量或其他考虑而要求较短长度时外,管子一般应具有最短管节长度16英尺。3.1.3 不圆度和端面直角度。应按需要采用适当的方法限制成品管子在任何横截面上的不圆度,测出的最大与最小直径之差应在该直径平均值的1%以内。管子的端面应与管子的轴线相垂直,其误差:对于管径在36英寸以下的管子不应超过1/4英寸;对于管径在36～120英寸的管子不应超过3/8英寸;对于更大的管子不应超过1/2英寸。3.1.4 直径公差。管子应为圆形且形状准确,并具有光滑而致密的内表面。每节管子任何
3.1 General requirements 3.1.1 Dimensions. Tubes 16 to 144 inches in diameter shall be supplied or tubes of larger size shall be supplied as required. 3.1.2 minimum pipe length. Except where shorter lengths are required due to weight or other considerations, the pipe shall generally have a minimum pipe length of 16 feet. 3.1.3 non-roundness and end face straightness. Appropriate methods should be used to limit the out-of-roundness of the finished tube in any cross-section, as required, and the difference between the maximum and minimum diameters measured should be within 1% of the average diameter. The end of the tube shall be perpendicular to the axis of the tube with an error of not more than ¼ inch for tubes less than 36 inches in diameter and 3/8 inches for tubes having diameters of 36 to 120 inches; Larger tubes should not exceed 1/2 inch. 3.1.4 diameter tolerance. The tube should be round and accurately shaped with a smooth and dense inner surface. Every tube any