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5

Pressure Drop Of Four-Way Pipe Fitting/cross

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#1 PhilippM

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Posted 25 February 2020 - 07:01 PM

Hello everyone,

 

I am currently trying to calculate the pressure drop for the modification of an existing piping system in a tank vapour system. The problem I am facing is that instead of regular elbows or bends, every change of direction of the line is done with a four-way pipe fitting (they look similar to this one: http://www.testbourn...-cross-aluminum), so e.g. the flow enters from the left branch and leaves at the the bottom branch, while the top and right branch are closed with a blind flange. We are not entirely sure why these four-way fittings were used in the first place, our best guess is that it has to do with the double-jacket that is used to heat the lines.

 

Are any K-values documented for this situation anywhere?

 

So far I haven't found anything, so I resorted to using a K value of 1,7 (Figure 2-16 from Crane TP 410), but I'm unsure if the additional branch causes further turbulence and pressure drop that is not accounted for in the aforementioned K-value.

 

Unfortunately there are quite many of these fittings in the most critical part of the line system, and they cause about 50% of the total pressure drop (using the K value of 1,7), so it's probably worthwhile to find a proper K-value.

 

Any help would be appreciated.

 

Kind regards

Philipp



#2 Chemitofreak

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Posted 26 February 2020 - 08:55 AM

Hi,

 

I would consider that as 90 degree short radius elbow and do the calculations

 

Regards



#3 jayari

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Posted 26 February 2020 - 03:45 PM

Could you find a section of piping where you could reasonably compare a calculated dP to measured dP and adjust the calculated value by varying the K that you use as the baseline? This way, you would have a better approximation for the other points in your network as well.



#4 Sharma Varun

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Posted 26 February 2020 - 11:22 PM

In my opinion you can consider fitting as a standard tee with flow through branch. 



#5 breizh

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Posted 29 February 2020 - 07:27 AM

Hi,

Consider the pamphlet attached(KSB)  you will find a combination of elbows .

 

Another good resource is pipe flow , a practical and comprehensive guide by Donald C.Rennels and Hobart M. Hudson

 

Good luck 

Breizh

Attached Files


Edited by breizh, 01 March 2020 - 04:41 AM.





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