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Determining Flow Coefficients (Cv) in Welded Tees

Determining Flow Coefficients (Cv) in Welded Tees

Determining Flow Coefficients (Cv) in Welded Tees

(OP)
I have been using the Crane Technical Paper No. 410 to calculate total flow coefficients for various pipe assemblies which are built by my company. A number of the assemblies utilize a welding tee per ASME B16.9. Page "A-29" from Crane is the only place in the book I have found thus far which discusses tees. On it there is a picture of a standard tee with the words "Flow thru run....K=20F_t" and "Flow thru branch....K=60F_t" beneath it. F_t is the friction factor. I need to know how to calculate the K value(s), or resistance coefficient(s), for the tee used in each scenario I am using, but I do not know what thru run or thru branch reference. Attached is a picture of the flow scenarios I have encountered.
   http://files.engineering.com/getfile.aspx?folder
Scenario 1 involves liquid flowing in thru one end of the run and out thru the other two openings. In scenario 2 the branch acts as the inlet, with the two ends of the run acting as outlets. The fluid is incompressible.

Thank You
-Justin Voegele
 

RE: Determining Flow Coefficients (Cv) in Welded Tees

Best way I can describe it is to look at a captial T.  If the flow comes in on the top part and continues straight ahead (i.e. ═) then it is flow through run.  If the flow comes in at either the top or the bottom and makes a turn (╗or╔)then it is flow through branch.

Patricia Lougheed

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RE: Determining Flow Coefficients (Cv) in Welded Tees

The flow has to turn 90 deg to go through the "branch". If the flow doesn't turn, and just goes past the opening, then it's "thru run".

So if you had the capital "T", but now had the flow coming from the bottom, you would actually have branch conditions for both outlets (since both paths turn 90 deg).

-- MechEng2005

RE: Determining Flow Coefficients (Cv) in Welded Tees

(OP)
Patricia & MechEng2005,

Thank you both for your posts. I now understand what is meant by flow thru run and flow thru branch.

-Voegele

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