×
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

How to calc C factor in DI pipe with multiple corp taps?

How to calc C factor in DI pipe with multiple corp taps?

How to calc C factor in DI pipe with multiple corp taps?

(OP)
I'm calculating C Factor of existing pipe in an operating water distribution system. I'm trying account my K losses, (fittings, other factors). I have an 8" inch Ductile Iron pipe and have about 17-1"inch corps tapped into the main throughout. The threads on these corps protrude in the DI pipe approximately an inch to 1/2 inch. How would one account for the resistance coefficient (K) for the 1-inch corp taps in my 8"DI pipe? If the inside liner looks like porcupine from the tapped service line connections this could be throwing my data off?

RE: How to calc C factor in DI pipe with multiple corp taps?

How long is this pipe? What "C" value are you using for the ductile pipe alone? What is the "C" value for the liner?

RE: How to calc C factor in DI pipe with multiple corp taps?

(OP)
I have various stretches or runs of pipe that I'm attempting to calculate the actual C factor for. The general Hazen Williams values table with ranges based on age-- I have that.

I'm attempting calculate my pipe based on the actual conditions of my system utilizing Hazen Williams and Darcy Weisbach formulas to calculate the actual c factor of my pipe. My runs are 400 to 1500 LF. I'm using a series of 3 hydrants, 2 of the hydrants have pressure data loggers G1, G2 and the third hydrant "Q" is the being flowed from the steamer port and I'm collecting my GPM with an Ultra Sonic flow meter. I'm now factoring in elevation, joints, valves and bends into my equation as "losses".

I'm trying to determine some sort of resistance coefficient for the 1 inch taps that protrude in the pipe liner.



RE: How to calc C factor in DI pipe with multiple corp taps?

Very small compared to all the other losses
but if you really want to see what it is, I would calculate the losses of an orifice plate with an equal projected area and use that in the Darcy Weisbach equation to get an estimate

Hydrae

RE: How to calc C factor in DI pipe with multiple corp taps?

never heard of this being done, these are truly "minor" losses compared to 1500 LF of bell and spigot waterline. not sure what the end game of this exercise is

RE: How to calc C factor in DI pipe with multiple corp taps?

Most engineers would ignore the minor headloss from corp. taps.

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


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:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close