×
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

nitrogen pipe sizing

nitrogen pipe sizing

nitrogen pipe sizing

(OP)
need a calculation for sizing nitrogen piping with these parameters.

250 psig working pressure
11 cfm volume
-65 F temperature
418 ft. of run

also need info on pressure relief valves.

RE: nitrogen pipe sizing

Nitro: The standard tables for air (nitrogen) don't go down to -65 deg F. However I noticed that they appeared fairly linear and made the assumption that they could be exprapolated down the necessary 25 deg's. Here are some of my results;
     
                  Q=0.1833 cft/sec                 Re= 4Q/(pi V D); Re = 28,010/D
                  v = 1.0 E-4 sq ft/s                  eps/D = 1.94 E-4
                  ro = 3.1 E-3 slugs/cft            Delta P =( 8L ro Q2/pi2)(f/D5)
                                                                        = 61(f/D5)
Calculate Re, eps/D, f, and delta p;
                 use D = 0.344 inch
                 eps/D = 1.95E-4
                 Re = 28,010/.344= 8.14E4
                 f = 0.02
       So delta P = 61 (0.02/.344 5) = 253.3 psi//    So: drawn tubing of appoximately 0.344 or 0.345 inch Diameter should give you your desired pressure. I could not find any sizes for drawn tubing so you will have to use some judgment in sizing your pipe or tube. The other thing that you must consider is the wall thickness and material so that the tube can withstand the pressure without bursting. I hope you find this of some help and best of luck.
Sincerely, Socrates

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