Aerospace series - pipe coupling 37 , spherical , in heat resisting steel - elbow 90 nipples , welded end - inch series 航空航天系列.耐热钢制球面37 ?管联接器.端部焊接的90 ?弯头管接头.英制
Petroleum and natural gas industries - induction bends , fittings and flanges for pipeline transportation systems - part 1 : induction bends 石油和天然气工业.管道输送系统用进气弯头管件和法兰.第1部分:进气弯头
Petroleum and natural gas industries - induction bends , fittings and flanges for pipeline transportation systems - part 1 : induction bends iso 15590 - 1 : 2001 modified ; english version en 14870 - 1 : 2004 石油和天然气工业.管道输送系统用进气弯头管件和法