标 准 编 号：BS EN 14870-3-2006简体中文标题：石油和天然气工业.管道运输系统的吸入管弯头、配件和法兰.法兰繁体中文标题：石油和天然气工业.管道咻斝到y的吸入管弯头、配件和法兰.法兰English Name：Petroleum and natural gas industries - Induction bends, fittings and flanges for pipeline transportation systems - Part 3: Flanges...