×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

flow rate of N2 past regulator

flow rate of N2 past regulator

flow rate of N2 past regulator

(OP)
I am interested in finding the flow rate (lb/hr) of nitrogen after a regulator.  the outlet pressure of regulator is around 45 psig.  the N2 is going to a unit which has a volume of X lbs.  the unit is to be filled with N2 just below the set psv pressure of 50 psig.

I am trying to find out the time it would require to fill the unit.  

can someone give a suggestion on how to solve the problem?  thanks







RE: flow rate of N2 past regulator

If the N2 supply pressure is constant, then is just the flow rate based on supply pressure, regulator outlet (45 psig) and Cv of the regulator.  You may heve to convert mass to volume(N2 .07381 Lb/ CF @ 14.696 and 60F).  

Use Fisher's, Kimrays, or Crane 410 Chapter 4.2.

RE: flow rate of N2 past regulator

Since the unit volume is known, calculate number of moles of N2 required to keep the unit at various pressures from the starting pressure to 45 psig.  Then, you can perform hydraulic calculations to see "how fast" you can deliver that specific number of moles from one pressure to the next.  Add times to obtain the total time.  Finer the pressure intervals, more accurate your results.

RE: flow rate of N2 past regulator

(OP)
tkdhwjd:

I have the number of moles N2 required from 25 psig to 45 psig, can you recommend the hydraulic calculation procedure? thanks

RE: flow rate of N2 past regulator

PV=znRT

RE: flow rate of N2 past regulator

Hydraulic calculations = pressure drop calculations based on your piping/regulator system.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources