Jump to content

Featured Articles

Check out the latest featured articles.

File Library

Check out the latest downloads available in the File Library.

New Article

Product Viscosity vs. Shear

Featured File

Vertical Tank Selection

New Blog Entry

Low Flow in Pipes- posted in Ankur's blog


Pressure Drop Of Four-Way Pipe Fitting/cross


4 replies to this topic
Share this topic:
| More

#1 PhilippM


    Gold Member

  • Members
  • 98 posts

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


#2 Chemitofreak


    Gold Member

  • Members
  • 200 posts

Posted 26 February 2020 - 08:55 AM



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



#3 jayari


    Junior Member

  • Members
  • 15 posts

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

Sharma Varun

    Gold Member

  • Members
  • 121 posts

Posted 26 February 2020 - 11:22 PM

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

#5 breizh


    Gold Member

  • ChE Plus Subscriber
  • 4,599 posts

Posted 29 February 2020 - 07:27 AM


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 


Attached Files

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

Similar Topics