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GB/T 20657-2022_Chinese: Petroleum and natural gas industries - Formulae and calculations for the properties of casing, tubing, drill pipe and line pipe used as casing or tubing (Chinese: 石油天然气工业 套管、油管、钻杆和用作套管或油管的管线管性能公式及计算) Note/Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working-hours typically, ASAP English versions: GB/T 20657-2022
