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Nitrogen Purging Calculator
Calculation Setup
Purging Method
i
Select the purging technique. Each method uses a different calculation model based on its operational principles.
Sweep-Through Purging
Pressure Purging
Vacuum Purging
System Parameters
Vessel Volume (V)
i
The internal volume of the vessel or equipment being purged.
ft³
m³
Liters
Gallons (US)
Initial O₂ Conc. (C₁)
i
The starting concentration of oxygen (e.g., 21% for air) in the vessel before purging begins.
%
ppm
Final O₂ Conc. (C₂)
i
The desired target oxygen concentration after the purge is complete.
%
ppm
Purge Gas O₂ Conc. (C₀)
i
The concentration of oxygen impurity in the nitrogen purge gas supply. Enter 0 for pure nitrogen.
%
ppm
System Parameters
Vessel Volume (V)
i
The internal volume of the vessel. Used to calculate the total amount of nitrogen consumed.
Gallons (US)
ft³
m³
Liters
Initial O₂ Conc. (C₁)
i
The starting concentration of oxygen (e.g., 21% for air) in the vessel before purging begins.
%
ppm
Final O₂ Conc. (C₂)
i
The desired target oxygen concentration after the purge is complete.
ppm
%
Purge Gas O₂ Conc. (C₀)
i
The concentration of oxygen impurity in the nitrogen purge gas supply. This is applicable for Pressure Purging. Vacuum Purging assumes pure N₂ backfill.
ppm
%
Pressure Settings
Low Pressure (Pₗ)
i
The lower pressure point in the cycle. For pressure purging, this is the starting (atmospheric) pressure. For vacuum purging, this is the vacuum pressure achieved.
psia
psig
bar (abs)
bar (gauge)
kPa (abs)
mmHg
High Pressure (Pₕ)
i
The higher pressure point in the cycle. For pressure purging, this is the pressurization level. For vacuum purging, this is the backfill pressure (usually atmospheric).
psia
psig
bar (abs)
bar (gauge)
kPa (abs)
mmHg
Actions
📄 Export PDF
🔄 Reset Inputs
Calculation Results
Required N₂ Volume:
-
Required Cycles (j):
-
Total N₂ Consumed:
-
Formula Used
V_purge = V × ln[(C₁ - C₀) / (C₂ - C₀)]
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