Process gas flow rate
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On our new DCS system, the flow rates of all process gases are expressed in terms of mass flow rate. We hadn’t really thought about this issue before; but now that I think about it, it’s actually just a matter of habit – using mass flow rate seems to work just as well. I’m not sure if any of you have encountered this situation; I know that in most cases it’s the volumetric flow rate that is relevant. What are the advantages of using each of these two values?
Mass flow rate is the product of volume flow rate and density under operating conditions
Each has its uses: it provides relatively accurate quality information during trade handovers, and the volume value is also very useful for engineering calculations!
Mass flow meters are generally used at the points where raw materials enter a factory and finished products leave it. Due to their high precision and relatively accurate measurement, they are also more expensive than other types of flow meters. As a result, they are not typically used in industrial processes; instead, other types such as vortex flow meters or orifice plates are employed, as they are cheaper and still sufficient to meet the requirements.
No, wait – mass flow rate is the volume flow rate multiplied by the density under standard conditions. If it’s the density at operating conditions, then what is displayed is usually the flow rate under standard conditions; in that case, conversion is still necessary
Mass flow rate and volume flow rate are the same thing; mass flow rate is obtained by multiplying volume flow rate by its density, and they are measured using the same principle.
You must be a large company; you use mass flow rates for all process gases – you’re really wealthy.
It has a lot to do with the design institute; for process gases, standard volumetric flow rates are generally used. However, those who have worked on Shell gasification projects know that for process gases, steam, and similar substances, mass flow rates are used instead.
It’s more accurate to measure process gas using volumetric flow rate. What is referred to as process gas can also be called process air. In the event of fluctuations in the process conditions, the composition of the process gas usually changes as well; therefore, measuring it solely based on volumetric flow rate is definitely not accurate. If a mass flow meter is used, it’s important to check whether it can determine the composition of the gas itself!
Sweat, mass flow rate and mass flow meters are two different things; for gases in industrial processes, volume flow rate is generally used, while for steam, mass flow rate is applied. For liquid media, both volume flow rate and mass flow rate are relevant. However, in some foreign companies’ patent portfolios, they prefer to use mass flow rate for both gases, liquids, and steam, as it gives a sense of consistency; but in reality this is troublesome as conversions are still required. I don’t understand either why it has to be done this way: lol. Last edited by hwindforce on 2009-2-23 18:14.]
Mass flow meters are generally used in applications where high precision and relatively accurate measurement are required. In the manufacturing process, other types such as vortex meters, orifice plates, rotors, Anubas, and electromagnets are generally used.