临界流 (正压法 )气体流量标准装置日前在中石油大连石化分公司计量中心综合流量检定站改造完成 ,并通过中国计量科学研究院组织的验收。经试运行证明 ,该装置达到设计要求 ,突破了气体流量表精确度无法检定校准的“瓶颈”。该装置采用先进的正压临界喷嘴检定技术 ,优于国内普 Critical flow (positive pressure method) gas flow standard device recently in the PetroChina Dalian Petrochemical Branch metering center comprehensive traffic verification station transformation completed, and through the China Institute of Metrology organization acceptance. The trial run proved that the device meets the design requirements, breaking the gas flow meter calibration accuracy can not be calibrated “bottleneck.” The device uses advanced positive pressure critical nozzle calibration technology, better than the domestic general