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读者问:“在最新公布的ISO5167:2003(E)国际标准中,对孔板和文丘里管上游所要求的最小直管段长度都提出了全新的要求。我厂使用孔板很多,按照新的国际标准要求,这些孔板流量计的上游直管段长度都不合格,应该怎么办?”孙教授:国际标准ISO5167:2003中所要求的上游最小直管段长度?
The reader asks: “In the newly published international standard ISO5167: 2003 (E), new requirements are placed on the minimum straight pipe length required upstream of the orifice and venturi.” I plant a lot of orifice plates, according to the new International standards require that the length of the upstream straight pipe sections of these orifice flow meters be unqualified and what should be done? "Prof. Sun: Is the minimum upstream straight pipe length required by ISO5167: 2003?