Standard litre per minute

The standard liter per minute (SLM or SLPM) is a unit of (molar or) mass flow rate of a gas at standard conditions for temperature and pressure (STP), which is most commonly practiced in the United States, whereas European practice revolves around the Normal temperature and pressure (NTP). Conversions between each volume flow metric are calculated using the following formulas: Prior to 1982, 1 L P M = ( .001 / 60 ) m 3 / s = 1 N L P M ⋅ T gas 293.15 K ⋅ 14.696 psi P gas = 1 S L P M ⋅ T gas 273.15 K ⋅ 14.696 psi P gas {\displaystyle 1\,\mathrm {LPM} =(.001/60)~\mathrm {m^{3}} /\mathrm {s} =1\,\mathrm {NLPM} \cdot {\frac {T_{\text{gas}}}{293.15\,\mathrm {K} }}\cdot {\frac {14.696\,{\text{psi}}}{P_{\text{gas}}}}=1\,\mathrm {SLPM} \cdot {\frac {T_{\text{gas}}}{273.15\,\mathrm {K} }}\cdot {\frac {14.696\,{\text{psi}}}{P_{\text{gas}}}}} Post 1982, 1 L P M = ( .001 / 60 ) m 3 / s = 1 N L P M ⋅ T gas 293.15 K ⋅ 14.696 psi P gas = 1 S L P M ⋅ T gas 273.15 K ⋅ 14.504 psi P gas {\displaystyle 1\,\mathrm {LPM} =(.001/60)~\mathrm {m^{3}} /\mathrm {s} =1\,\mathrm {NLPM} \cdot {\frac {T_{\text{gas}}}{293.15\,\mathrm {K} }}\cdot {\frac {14.696\,{\text{psi}}}{P_{\text{gas}}}}=1\,\mathrm {SLPM} \cdot {\frac {T_{\text{gas}}}{273.15\,\mathrm {K} }}\cdot {\frac {14.504\,{\text{psi}}}{P_{\text{gas}}}}} 1 S L P M = 1 N L P M ⋅ 273.15 K 293.15 K ⋅ 14.696 psi 14.504 psi ≈ 0.94411 N L P M {\displaystyle 1\,\mathrm {SLPM} =1\,\mathrm {NLPM} \cdot {\frac {273.15\,\mathrm {K} }{293.15\,\mathrm {K} }}\cdot {\frac {14.696\,{\text{psi}}}{14.504\,{\text{psi}}}}\approx 0.94411\,\mathrm {NLPM} } assuming zero degree Celsius reference point for STP when using SLPM, which differs from the "room" temperature reference for the NLPM standard.

Source: Wikipedia — Standard litre per minute (CC BY-SA 4.0)

Standard litre per minute

The standard liter per minute (SLM or SLPM) is a unit of (molar or) mass flow rate of a gas at standard conditions for temperature and pressure (STP), which is most commonly practiced in the United States, whereas European practice revolves around the Normal temperature and pressure (NTP). Conversions between each volume flow metric are calculated using the following formulas: Prior to 1982, 1 L P M = ( .001 / 60 ) m 3 / s = 1 N L P M ⋅ T gas 293.15 K ⋅ 14.696 psi P gas = 1 S L P M ⋅ T gas 273.15 K ⋅ 14.696 psi P gas {\displaystyle 1\,\mathrm {LPM} =(.001/60)~\mathrm {m^{3}} /\mathrm {s} =1\,\mathrm {NLPM} \cdot {\frac {T_{\text{gas}}}{293.15\,\mathrm {K} }}\cdot {\frac {14.696\,{\text{psi}}}{P_{\text{gas}}}}=1\,\mathrm {SLPM} \cdot {\frac {T_{\text{gas}}}{273.15\,\mathrm {K} }}\cdot {\frac {14.696\,{\text{psi}}}{P_{\text{gas}}}}} Post 1982, 1 L P M = ( .001 / 60 ) m 3 / s = 1 N L P M ⋅ T gas 293.15 K ⋅ 14.696 psi P gas = 1 S L P M ⋅ T gas 273.15 K ⋅ 14.504 psi P gas {\displaystyle 1\,\mathrm {LPM} =(.001/60)~\mathrm {m^{3}} /\mathrm {s} =1\,\mathrm {NLPM} \cdot {\frac {T_{\text{gas}}}{293.15\,\mathrm {K} }}\cdot {\frac {14.696\,{\text{psi}}}{P_{\text{gas}}}}=1\,\mathrm {SLPM} \cdot {\frac {T_{\text{gas}}}{273.15\,\mathrm {K} }}\cdot {\frac {14.504\,{\text{psi}}}{P_{\text{gas}}}}} 1 S L P M = 1 N L P M ⋅ 273.15 K 293.15 K ⋅ 14.696 psi 14.504 psi ≈ 0.94411 N L P M {\displaystyle 1\,\mathrm {SLPM} =1\,\mathrm {NLPM} \cdot {\frac {273.15\,\mathrm {K} }{293.15\,\mathrm {K} }}\cdot {\frac {14.696\,{\text{psi}}}{14.504\,{\text{psi}}}}\approx 0.94411\,\mathrm {NLPM} } assuming zero degree Celsius reference point for STP when using SLPM, which differs from the "room" temperature reference for the NLPM standard.

Source: Wikipedia "Standard litre per minute" · CC BY-SA 4.0

Share this article: X · Bluesky
Privacy Policy