Calibration of low-pressure small-diameter flow meters
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We purchased mass flow meters from Cologne Company for the external metering of natural gas; the specifications are diameter less than DN150 and pressure below 4 MPa. We contacted various calibration stations in Huayang, Sichuan, as well as those in Wuhan and Nanjing under Sinopec, but all said that the calibration gas pressure needs to be above 5 MPa to carry out calibration. We don’t know where we can have low-pressure gas flow meters calibrated Our precision is at the 0.35 level; we would appreciate your guidance
Turn to the China National Institute for Testing and Certification. Regarding the calibration of natural gas meters, the several companies you contacted specialize in the calibration of large-diameter pipelines; in fact, many flow measurement laboratories affiliated with quality inspection bureaus are capable of calibrating low-pressure, small-diameter flow meters, among which Chengdu Central Testing Institute is considered to be the best.