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Converting flow rate from normal/standard liters per minute to cubic meters per second

Engineering Asked on April 14, 2021

I’m really confused about these three units commonly used for measuring airflow:

  • cubic meters per second (m3/s)
  • normal liters per minute (NLPM)
  • standard liters per minute (SLPM)

I would appreciate if you could help me know how to convert them to each other. For example, is

$$1 , m^3/s = 1 , NLPM / left( 1000 . 60 right) $$

correct?

One Answer

The conversions can be found at this wikipedia page

$$ 1 frac{m^3}{s} = 1000 [NLPM] frac{T_{gas}}{293.15}cdotfrac{14.696 [psi]}{P_{gas}} = 1000 [SLPM] frac{T{gas}}{273.15}cdotfrac{14.504 [psi]}{P_{gas} [psi]} $$

where:

  • $T_{gas}$: is the temperature that the gas is flowing
  • $P_{gas}$: is the pressure that the gas is flowing

Answered by NMech on April 14, 2021

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