×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*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.

# Calculating Pipe Dia At Max Velocities

## Calculating Pipe Dia At Max Velocities

(OP)
Hi, what formula can I use to calculate the required minimum diameter of a pipe where the flow rate is known, and where the velocity is specified as being a maximum of 1.5metres per second?? Fluid is clean fresh water.
Replies continue below

### RE: Calculating Pipe Dia At Max Velocities

Woka!

The formula is Q = (3.142/4)D^2*V

Where Q is the required flow rate in cu.m/sec, D is pipe inner diameter in meters and V is the velocity of fluid in meters/second. Readjust the equation and you will get the size of the pipe. (There obviously is a minimum diameter than this value) You have to fix the velocity based on the losses in the piping system.

Regards,

Truth: Even the hardest of the problems will have atleast one simple solution. Mine may not be one.

### RE: Calculating Pipe Dia At Max Velocities

Woka,

d (mm) =18.8 x (SQroot [Q (m3/hr)/V(m/s])

d= pipe diameter
Q= flowrate
v= velocity

GB

#### 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.

Close Box

# Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!