Agilent Technologies 5977B Series - Page 54

2 Installing 7890 GC Columns 
54 5977B Series MSD Operating Manual
Calculation for average linear velocity
Average linear velocity (cm/s) =
where:
L = Length of the column in meters
t = Retention time in seconds
Calculation for volumetric flow rate
Volumetric flow rate (mL/min) =
where:
D = Internal column diameter in millimeters
L = Column length in meters
t = Retention time in minutes
100 L
t
--------------
0.785 D
2
L
t
----------------------------