Questions regarding the installation of pipe-type orifice plate flow meters

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This post was last edited by chenmiao112 on 2019-8-9 at 22:15. I installed pipe orifice flow meters at the steel plant site; they are designed for a flow rate of 8.5 standard cubic feet per hour as a typical value, with a maximum of 30 standard cubic feet per hour, and the medium used is propane. It has been installed, but the actual flow rate is 2.3 kg per hour. The EJA110 sensor is being used to measure the pressure difference, and its reading is far lower than the actual value on site. I would like to ask everyone what could be causing this phenomenon. What I learned later is that the gas used on site was supplied from cylinders into the pipelines; the pressure in the cylinders was 3 kilograms, and the net weight of the gas was 30 kilograms. It is known that 600 kg of gas was used at this site over a period of 21 hours. This total amount includes gas used in other sites as well, but the consumption at our installation site is the highest – the medium used is propane, with a density of 1.964; the temperature is assumed to be around 35 degrees, and the pressure in the pipelines at the site is about 1.5 kilograms per square meter. My estimate is as follows: I’ve taken a minimum value of 300 kg (the actual consumption will definitely be higher than this figure). Based on 21 hours, the consumption rate is 14.29 kg per hour. With a density of 1.964, this corresponds to 7.274 cubic meters per hour. At a pressure of 3 kilograms per square meter, the volume equivalent is 28.81 cubic meters per hour. I’m calculating the maximum amount of 600 kg to be used in total (such a large quantity is unlikely to occur in practical applications). Based on 21 hours, the usage rate is 28.572 kilograms per hour; with a density of 1.964, this corresponds to 14.548 cubic meters per hour. At a pressure of 3 kilograms, the equivalent volume is 57.620 cubic meters per hour. If the flow in the two pipes on site is distributed evenly, then each pipe will have a maximum flow of 28 cubic meters, and a minimum flow of around 14 cubic meters. Could everyone please help me check if my calculations are correct? Also, please take a look at the description I’ve given of the scene to see if there are any issues that need attention, or if certain aspects of it are inappropriate or unreasonable. Finally, it’s about whether our current flow meter can be used. If differential pressure data is available, how much should be adjusted? Or could you please help point out any mistakes or unreasonable aspects in this? I’m very grateful. The situation on site is quite complicated, so I earnestly ask for your advice.