标准 Standard:
API SPEC 5L

用途 Used:
用于石油、天然气工业中的气、水、油输送。
For conveying gas,water,and oil in both the oil and natural gas industries

尺寸公差 Tolerances on Dimensions：

标准/Standard		外径公差/Outside Diameter Tolerance				壁厚公差/Wall Thickness Tolerance
API SPEC 5L		D<60.3mm		+0.41mm/-0.40mm		+15.0%/-12.5%
		D≥60.4mm		+0.75%/-0.40mm