Help me SWAG a head loss

[MintJulep]

I get to play piping engineer today.

I've got a horrible existing configuration and need to SWAG the head loss.

12 inch diameter schedule 80 manifold, oriented vertically. Off of that are six 4 inch take offs welded at 90 degrees and evenly spaced.

Blind Flange
[]
[]------ 6x 4 inch out
[]------
[]------
[]------
[]------
[]------
[]============12 inch in(actually 180 degrees opposite)
blind flange


Total flow is 3,000 gpm water. I know it's not true, but just assume equally divided between the 6 outlets.

What is the head loss for the the 12" manifold to 4" take off? Flow is reversible, so if it's different for each direction what is it for both?

I can't find a similar configuration in my Cameron.

 

[Latexman]

It sounds like you are not going to evaluate the maldistribution, so a simple approach is to characterize an average head loss as a 4" branch tee with 500 gpm flow plus half the length of the manifold with 3000 gpm flow in 12" pipe.

Good luck,
Latexman

Need help writing a question or understanding a reply? forum1529

 

[MintJulep]

I elected to treat as 12" branch-flow tee + "sudden contraction".

Does that sound horribly wrong to anyone?

 

[btrueblood]

You might add 1 to the K-factor for a right angle turn, and compare to results without. The debate is which diameter to use when accounting for the turn.

 

[Latexman]

Take a look at this.

Good luck,
Latexman

Need help writing a question or understanding a reply? forum1529

 

[MintJulep]

Virtual LPS for Latexman.

Chasing down one of the referenced sources from that paper now. Thanks!