Gas Plumbing Maximum GCS

[climber2k]

Afternoon,
I am just curious as to roughly how many GCs can be run off of 1/4 line say for makeup at a flow of 30ml/min?
We run about 5 gcs and have a mess of tanks hanging around, which i would like to consolidate as a winter project.
I dont think each gc needs its own Helium tank for example.
Thx
CM

[uzman]

No problem for 5 GCs using 1/4'' line.
We are using 4 GCs on 1/8'' line .

[Yama001]

Yep, we have 5 GC's on a 1/8 line. The tanks lasts 2 to 3 weeks. Just be sure you have around 100 psi out of the tank, to account for pressure drops along the line (though you may need less with 1/4 tubing).