Sspec is the specified pumping speed of the pump Ctube is the conductance ... Conductance of Tube, Calculation of Conductance ... Conductance of Tube, ...
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TECH TIPS Conductance of a Tube This page provides a simplified method for calculating the conductance of a tube and the resulting limitations that the tube places on pumping speed.
Calculation of Conductance The following formulas are for dry air at 20º C in the molecular flow region of vacuum. Conductance of a long tube:
C = 75D3/L C is Conductance in liters-per-second D is the tube inner diameter in inches L is the tube length in inches So, for example, D is 2.0 inches and L is 20.0 inches. C = (75 x 8)/20 = 30 liters-per-second
Conductance Limitations on Pumping Speed The influence of tube conductance on pumping speed is calculated as follows:
MECHANICAL PUMPS
1/S act = 1/S spec + 1/C tube Where: Sspec is the specified pumping speed of the pump Ctube is the conductance of the tube attached to the pump Sact is the actual pumping speed at the end of the tube away from the pump So, for example, if Sspec is 50 liters-per-second and Ctube is 30 liters-per-second, 1/Sact = 1/50 +1/30 = 0.020 + 0.033 = 0.053, and, Sact = 1/.0053 = 18.87 liters per second In other words, the conductance of the tube has resulted in an effective loss of pumping speed of more than 60 percent! For more detailed discussions of conductance of apertures, short tubes or different shapes, see reference materials such as: 1. Handbook of Vacuum Science and Technology, Hoffman, Singh and Thomas, Academic Press, 1998 2. Scientific Foundation of Vacuum Technique, Dushman and Lafferty, Wiley, 1962.
