关于孔板法兰? the straight runs of pipe required upstream and downstream for orifice flanges shall be kept as per drawings. in principle , the upstream straight pipe length shall be one piece .when there is an unavoidable weld in the length ,the distance between the orifice and the weld shall be not less than 14 times the pipe diameter . the straight lengths of pipe shall not be provided with a vent ,drain,or other similar branch Jack screws wherever required shall be installed so that they are 180度 apart from each other when orifice taps are to be taken off form a pipe the hole shall be drilled strictly in the positions shown on the drawings,the burrs and the oles made smooth查看更多2个回答 . 3人已关注