×
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 in pipe from a storage tank

flow rate in pipe from a storage tank

flow rate in pipe from a storage tank

(OP)
I have a storage tank with oil elevation as 20m.A pipeline flows from the bottom about 500 m long and I want to know the discharge rate at the exit of that pipe.This can only be done if I know the discharge velocity.I am applying Bernoulli equation on the pipe exit point and tank top. Can I assume that the pressure at the exit of the pipe would be atm.If I don't do this then there are lot of unknown variables in the equation. In my opinion it might not be atmospheric because there will be some pressure inside the pipe on top of the atm pressure even though I am taking into account the losses due to friction and velocity head etc.  

RE: flow rate in pipe from a storage tank

At the outlet, the pressure is atmospheric. There is an exit loss that needs to be included, but after that it's atmospheric.

Cheers,
John

RE: flow rate in pipe from a storage tank

Crane 410.....

   

RE: flow rate in pipe from a storage tank

Dont forget the pressure on fluid in pipe (head) changes with the level of fluid in the tank. As fluid exits, the head decreases. The velocity would also decrease as the tank empties, from max to a dribble.

 

RE: flow rate in pipe from a storage tank

You could use the formula - Head = Lambda LV squared over 2 gd

Or dig deeper and determine the dynamic and kinemtic viscosity to calculate the Reynolds number enabling you to determine the type of flow either lminar or turbulant which will lead to your flow rate.

I agree their are always so many variables, the inside roughness of the pipe, but viscosity in centistokes is important

RE: flow rate in pipe from a storage tank

This is a Fluid Mechanics 101 problem.  Suggest you crack open your fluids textbook from college, Mark's, or Crane TP 410.  In fact this exact problem is in the Crane 410.

Always best to check your basic references first.  This way you become educated on the problem, you have learned something, and you have learned your references better.  All of these benefit you in the future.  It's a win-win for you.   

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