What is the traffic unit in the standard state?
In gas flow metering,L/min(Liters per minute) usually refers to the volume flow under actual working conditions, whileNm³/min(Standard cubic meters per minute) indicates that the gas is in the standard state (0 °C，101.325 kPa, dry gas) volume flow. The two cannot be directly equivalent, and need to be converted through temperature and pressure correction.
200 L/min calculation logic converted to Nm ³/min
1 Nm³ = 1000 L (In the standard state), therefore:
- 200 L/min = 200 ÷ 1000 =0.2 Nm³/min
the premise of the conversion is: 200 L/min it is clearly in the standard state (I.e. equivalent to Nl/min), otherwise it needs to be corrected according to the actual temperature, pressure and humidity. In engineering practice, if not specified, L/min multi-finger working condition flow, at this time, operation parameters must be provided to accurately convert.
Key notes
- unit identification must be clear: L/min it should be marked as “Nl/min” or “sm³/min” to distinguish standard and working condition flow;
- purifying compressed air has little effect: drying and filtering have no substantial influence on volume flow conversion, but will affect purification indexes such as dew point and oil content;
- unified definition of standard status: commonly used in china 0 °C/101.325 kPa, some industries adopt 20 °C, you need to confirm the standard.