×
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.

# flow calcs

## flow calcs

(OP)
can any body please tell me what the formula is for determining what the max flow of water (gals/min) is through a pipe at a given pressure (psi) per foot?

thanks

das123

### RE: flow calcs

It will depend on what your aim is:

max dP, max velocity is just two obvious criteria

When you have choosen than then you must select a design value (eg. 0.5 bar/100 m or max. velocity 1 m/sec)

Best Regards

Morten

### RE: flow calcs

If you are looking for an equation that relates Q to dP/L then combine the following found in Crane TP-410

Q = 236*d^2*sqrt[dP/(K*p)] and K = (f*L)/d
or
Q = 236*sqrt[(dP/L)*{d^5/(f*p)}]

where
Q gpm
dP delta Pressure psi
L length ft
d diameter inch
f friction factor, dimentionless, per Moody chart or from Crane TP-410 chart for turbulent flow.
p specific weight lbs/ft^3

#### 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!