Calculation of required relief area of breathing valve
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When calculating the required relief area of a breathing valve according to API2000, because the required relief amount is generally expressed in standard air, I think the molecular weight should be the molecular weight of air when calculating the relief area, and the temperature should also be calculated as 0 degrees. However, when I encounter many manufacturers of breathing valves, when providing the relief area, they are calculated based on the molecular weight of the actual medium. Is my understanding wrong? Could any expert please shed some light on this, thank you very much! ! ! formula:
For the calculation part, you must first calculate the content, and then use the method of comparing air to convert it into the amount of emissions if it is air. If determined, the size will basically be determined.
If the unit of the discharge amount is the discharge amount of air in the standard state, does MZT in this formula mean the calculation of the molecular weight of the air, the compression factor of the air, and the temperature of the standard state? Even Pi is calculated using the standard pressure (because whether it is a breathing valve or an emergency relief valve, the set pressure is very low, and the pressure when the medium is released is very close to the standard pressure, so the calculation results are not much different and have different meanings).
Yes, but generally speaking, most of the safety valves used are organic or hazardous substances, so in calculations, it is necessary to compare it with air and then multiply it by a coefficient for conversion.
First of all, thank you very much for your answer, thank you very much! I mean: If the required discharge volume has been converted into the discharge volume of standard air NM3/h air (because the respiratory volume calculated by API2000 is generally the required discharge volume of standard air), then when I calculate according to the formula, MZT should be taken according to the air, (M=29, Z=1.4, T=273).