The Pressure Loss in Straight Gas Lines Calculator is used to determine the pressure loss from friction in straight pipes or tubes that transport gases. This calculator is useful for very small piping or tubing, and can handle flow through small channels. It includes inlet and outlet losses, but cannot accommodate losses due to fitting and valves. For standard-sized pipes, use the Loss in Flow Lines Calculator instead.
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Pipe/Tubing Inner Diameter (in):
Piping Material:
Flow Rate:
Flow Rate Units:
Viscosity: (cP) (Typical Values)
Typical Viscosity Values
Air @ 70F.0180 cP
Ammonia @ 70F.0100 cP
Carbon Dioxide @ 70F.0143 cP
Temperature: (F)
Gas Molecular Weight: (lb/lbmol) (Typical Values)
Typical Molecular Weight Values
ACETYLENE26 lb/lbmol
AIR29 lb/lbmol
AMMONIA17 lb/lbmol
ARGON39.9 lb/lbmol
CHLORINE70.9 lb/lbmol
HYDROGEN2 lb/lbmol
NATURAL GAS19.5 lb/lbmol
NITROGEN28 lb/lbmol
OXYGEN32 lb/lbmol
PROPANE44.1 lb/lbmol
STEAM18 lb/lbmol
Specific Heat Ratio: (Typical Values)
Typical Specific Heat Ratio Values
Carbon Dioxide1.30
Natural Gas1.27
Compressibility Factor:
Inlet Pressure:
Piping Length (ft):
Other Losses:

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