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Maintaining low pressures with low flow rates

All,

I am having trouble with a nitrogen gas application.  

Backstory:  I work in a geoscience lab and we use gas pressure to displace water from saturated core samples to develop capillary pressure curves.  The gas pressure is monitored with transducers and gauges.  Some samples require very low gas pressures.  The system is typically such that very low flow rates are required as well.  If the system is as leak free as it should be then the flow rate could be as low as a few cubic centimeters per month (less in some cases).  My current selection of regulators constantly drifts up so that my outlet pressure is creeping up when it needs to be constantly maintained.  Would the Tescom 44-2200 Series Single stage regulator be appropriate?  Also i was curious if adding a needle valve on the outlet so that the outlet flow could be increased by venting to the atmosphere might aid in this regard?

Any guidance is much appreciated.

Phillip

• 4 Oct 2016 2:30 PM
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1 Reply

• Anthony Hartman

  

  • 4 Oct 2016 9:46 PM

  Phillip,
  
  Your issue could be coming from a variety of factors such as variation in your nitrogen gas pressure or sizing of the pressure regulator. Due to the variations in setups and equipment the best method to ensure we provide the ideal solution is to have you talk to our Application Engineering team. They will be able to talk through your setup and provide a recommendation that achieves your desired result. Please email your contact information to na.tescom.@emerson.com or call directly at 1-763-241-3238. I have notified the Application Engineering team of your question and they look forward to discussing with you.
  
  Thanks for the question.

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