syshanika wrote:
Thanks a lot.
The 1 bar pressure reduction is at the pressure cylinder.
i got agilent 7890b GC with 5977 MS. i will check again with flow on.
Will a flow rate of about 10 ml/min would work?
With that kind of flow rate how much of a pressure reduction can be expected if the system has no leak.
I have a system here with two columns that run about 30ml/minute split flow in standby, 0.5ml/min column flow. That system has been on a single cylinder of Helium for almost two months and only used about 1/3 of pressure in the cylinder. A single inlet with standby split flow of 10ml/min will last at least 6 months per cylinder.
A typical gas cylinder will contain about 7,503,740 ml of gas at atmospheric pressure so at a flow of 10ml/minute that would be a flow time of 750,374 minutes which is 12,506 hours which is 512 days. So a cylinder should last between 6 and 12 months at such a flow rate.