Problems with using mass flow meters for liquid ammonia filling
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The company installed mass flow meters at the location where liquid ammonia is filled, and found that in the unfilled state the density indicated 6.14 with a temperature of 17.5; once filling began, the density dropped sharply, fluctuating between 4.9 and 5.0. The outlet pressure is 1.3 Mpa. By comparing this with the saturated vapor pressure of liquid ammonia, it can be seen that at a temperature of 18 degrees, the saturated vapor pressure is only 0.8 Mpa. In theory, liquid ammonia shouldn’t vaporize at such conditions. Is there anyone who can discuss this?
Is the flow meter installed in the inlet pipeline?
The pipeline is long, with a diameter of DN50; the flow meter is installed at the filling location
The pressure in the reference pipeline and the pressure in the loading pipeline~during the loading of liquid ammonia~some vaporization occurs~the pressure of the gas phase can be compared with that of the tank truck’s gas phase, and the liquid phase can also be compared with that of the tank truck~