How many GC's can share 1/8" gas lines?

[MSCHemist]

I have a question as too how many instruments can share 1/8" helium and FID Air lines until the lines can't support the flow demand and pressure drop is an issue?

We tend to do a lot of 200:1 injections so that puts a fair demand on the helium line at times if multiple instruments are injecting at the same time.

Obviously FID air requires 400ml/min per FID.

We set the regulators at 80 PSI for the gas lines.

[Jake]

It will partly depend on how far the tanks are from the GCs, due to line pressure drop. What's the distance?

[Consumer Products Guy]

Would you be able to move up to larger lines and then decrease to 1/8" right at the GCs?

[MSCHemist]

They are a pretty good distance probably 20' or more and they go inside the wall so replumbing with 1/4" would be tough.

[Peter Apps]

https://www.google.com/search?q=gas+flo ... e&ie=UTF-8