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Gnardude

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- TL;DR Summary
- Volumetric flow rate of nitrogen through relieving pressure regulator

Hello all,

I'm having trouble figuring out the volumetric flow rate upstream of a relieving pressure regulator used on a 1/4" OD nitrogen line. Upstream of the regulator P=100 PSIG and T=70F, while downstream P=80 PSIG and T=70F with downstream consumption at q=4 L/min or 0.91 SCFM (at std. T=70F, P=14.7 psia). My thoughts are to use boyles law, P1V1=P2V2 (ideal gas law), to calculate the upstream flow rate, which would equal 3.2 LPM not taking into account the flow leaving through the vent, however, I'm not too sure if the pressure regulator would impact the flow in anyway. Does anyone have an idea of how to calculate the upstream flow or if my method is correct? I currently don't have the spec sheet for the regulator, so I'm negating the flow through the vent until I have it tomorrow.

I'm having trouble figuring out the volumetric flow rate upstream of a relieving pressure regulator used on a 1/4" OD nitrogen line. Upstream of the regulator P=100 PSIG and T=70F, while downstream P=80 PSIG and T=70F with downstream consumption at q=4 L/min or 0.91 SCFM (at std. T=70F, P=14.7 psia). My thoughts are to use boyles law, P1V1=P2V2 (ideal gas law), to calculate the upstream flow rate, which would equal 3.2 LPM not taking into account the flow leaving through the vent, however, I'm not too sure if the pressure regulator would impact the flow in anyway. Does anyone have an idea of how to calculate the upstream flow or if my method is correct? I currently don't have the spec sheet for the regulator, so I'm negating the flow through the vent until I have it tomorrow.