×
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

Pressurizing a Vessel with Air

Pressurizing a Vessel with Air

Pressurizing a Vessel with Air

(OP)
I am having trouble trying to figure out in a ballpark way, how to determine what flow rate of air is needed to pressurize a vessel to a known pressure, in a set time.  I.e, a 8,500 ft3 vessel to 5 psig in 30 min.  The inlet line size will be determined at a later date.  I vaguely remember from school a couple simple equations that can be used, but all I can think of at the moment is Q=(rho)*A*V, and that doesn't help, since it doesn't deal with pressure.  I appreciate your help.

Kayla

RE: Pressurizing a Vessel with Air

Howdy!

Let's assume the tank is initially filled with air at 14.7 psia with air weighing .075 lb per cubic foot. Then the initial weight of air in the tank is .075 lb/ft^3 X 8500 ft^3 = 637.5 lb.

Tnen let's assume the tank is filled at constant temperature to 19.7 psia.

New weight is 637.5 X 19.7/14.7 = 854.34 lb.

New weight minus old weight = 854.34-637.5 = 216.34 lb.

To fill in 30 min, flow rate  = 216.34/30 = 7.23 lb/min.

To change this to SCFM, divide by standard weight density (.075).

Flow rate = 7.23/.075 = 96.37 scfm.

Did this help?

Pat  http//www.aquasite.com/skonkworks

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