Vacuum Pipeline Conductance

[balagast]

I am trying to size a couple of sorbtion traps for a vacuum pipeline (sieves) and I would like be able to make sure the pipeline will support the required flow level at my desired vacuum level.

I know there will be a couple of tees, elbows and the approximate length of pipe.

Does anyone have a general guideline for calculating the overall conductance of the pipeline? I am familiar with calculating pressure drops, friction factors etc, but conductance is not something I have really encountered before.

The system needs to support about 40 CFM at a vacuum level of .78 torr.

 

[balagast]

Sorry, actually the vacuum level will be .078 torr .. that was a typo.

 

[BigInch]

Change to absolute pressures and it's pressure drop.

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