Hi Greg,

While I haven't got the answer to your question as such, I can however tell how we solved this "problem".

To remove CO from the ConFlo "chimney" our ‎engineers T'ed into an existing exhaust duct (serving a fume hood) having satisfied themselves the flow (extraction) rate of the CO duct was meeting requirements. Since the pump exhaust flow is next to nothing once the IRMS has been evacuated, our engineers were quite happy for us to feed/insert the pump exhaust hoses into the flexi-duct above the ConFlo.

Hope this helps.

Best,

Wolfram

Prof. Dr W Meier-Augenstein, FRSC
Stable Isotope Forensics
Robert Gordon University Aberdeen

Sent from my BlackBerry 10 smartphone.
From: Gregory Henkes
Sent: Tuesday, 1 November 2016 16:15
To: [log in to unmask]
Reply To: Stable Isotope Geochemistry
Subject: [ISOGEOCHEM] Exhaust venting of IRMS gases


Hello Isogeochemers,

Here’s one for the group that I can’t seem to find a solid answer to: What is the minimum flow rate of the vent used to remove pump exhaust from an irms? Bonus points if you can point me to a place where it is stated as part of some manufacturer’s spec. We’re building a new stable isotope facility at Stony Brook and this question has come up in the budgeting of air along with fume hoods, gas cabinets, etc. For whatever reason, our engineers have spec’d out 250 CFM from a relatively small diameter snorkel vent that will drop down near the instrument from the ceiling. Myself and others have pointed out that seems like absolute overkill - I’ve got visions of the Suck Cut<https://www.youtube.com/watch?v=AioVDsXidh0> from Wayne’s World if one were to get their head near this thing while working on the instrument.

Seriously though, any insight would be really appreciated - my urging of something benign will be heard more clearly with some hard numbers… activate the hive mind!

Thanks,
Greg




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