The issue of high steam meter readings
Thread Content
Our company’s steam turbines are supplied with steam via a DN350 pipeline connected to the steam distribution cylinder; the pressure in the cylinder is 0.82 mPA, and the steam temperature is 215°C. A DN350 vortex flow meter (a domestic-made instrument with a range of 0–9500 m3/h; the density of the steam is approximately 4.32 kg/m3 during supply) is installed 30 meters upstream of the pipeline. The air inspection error of this instrument, as verified by the calibration agency, is basically at -1.07%. A DN300 vortex flow meter (Yokogawa) is installed 700 meters at the end of the pipeline for measurement; the pressure here is 0.78 mPA and the temperature is 197°C. During normal steam supply, the domestic gauge always shows a value about 5 t/h higher than that of the Yokogawa gauge. I hope the experts at HaiChuan can help analyze the reason for this. Thank you in advance: handshake!
The temperature and pressure at the locations where the two flow meters are installed are different; for steam measurement, such differences are normal. As the steam moves from upstream of the domestically produced gauge to downstream of the Yokogawa gauge, the temperature drops by 17 degrees and the pressure decreases by 0.4 kilograms; consequently, there is a difference in steam measurement due to the formation of a considerable amount of condensed water.
Based on your description, isn’t your temperature and pressure compensated in real time?
Provide the temperature and pressure compensation details for the next two flowmeters