10 replies to this topic

[benoyjohn]

Dear all,

I had to calculate the friction loss in a distribution header. (Sketch attached)

1. Please advise while calculating the equivalent lenghths , if the T sections have to be considered as a part of 24" line or 8" line.

2. Also the T sectons are unequal tees. 24"x24"x8". I guess that the equivalent lengths given in Crane for Tees are for Equal Tees. I mean 24"x24"x24". Are the Crane equivalent lengths valid for this type of unequal Tees also? Is there a method for calculating pressure loss in unequal Tees?

Thanks and Regards
Benoy

Attached Files

•  Book1.xls   14.5KB   214 downloads

[katmar]

If you are calculating the pressure loss along the header you are working with the pressure drop through the "run" part of the tee and not through the branch. I doubt whether the size of the branch has any significant effect on the pressure drop through the run.

If you want to calculate the pressure drop through the 8" tap offs I would regard each one as starting with an 8" tee with the flow through the branch. This is probably a bit on the conservative side. The significance of the pressure drop in the tee depends on how long the tap off lines are, and what other fittings are in the line. You have to calculate the pressure drops in the header and in the tap offs separately because the flows are different, unless you are using network software which would then probably be able to model the reducing tees for you.

[Murph]

You are right. Crane gives equivalent lengths for standard tees and not the "reducing tee" configuration. Internal FLow systems by D.S> Miller is a book that gives K values for reducing tee configurations. Also research paper by Kenji, a JApanese prof gives an empirical corellation to calculate pressure drop in reducing tee.
i could mail u stuff if you pass on ur email id.

Regards,
VK

Can you give me the full reference for the article by the Japanese Professor Kenji?

Thanks

[Rama Maganti]

Hi VK,

I have the same problem as mentioned before. Can you e-mail the stuff to me? The e-mail id is rvsagar6@gmail.com

Thanks,

RM

You are right. Crane gives equivalent lengths for standard tees and not the "reducing tee" configuration. Internal FLow systems by D.S> Miller is a book that gives K values for reducing tee configurations. Also research paper by Kenji, a JApanese prof gives an empirical corellation to calculate pressure drop in reducing tee.
i could mail u stuff if you pass on ur email id.

Regards,
VK

[narendrasony]

Hi VK,
Can you please post me this stuff on reducing tee? My e-mail id is : narendrasony@rediffmail.com

Thanks
Narendra

[naziruddin]

You are right. Crane gives equivalent lengths for standard tees and not the "reducing tee" configuration. Internal FLow systems by D.S> Miller is a book that gives K values for reducing tee configurations. Also research paper by Kenji, a JApanese prof gives an empirical corellation to calculate pressure drop in reducing tee.
i could mail u stuff if you pass on ur email id.

Regards,
VK

Can you give me the full reference for the article by the Japanese Professor Kenji?

Thanks

HI VK

i ALSO WILL BE VERY GLAD TO RECEIVE THE COPY OF AN ARTICLE BY PROFESSOR KENJI.

THANKS AND REGARDS
NAZIR

[naziruddin]

You are right. Crane gives equivalent lengths for standard tees and not the "reducing tee" configuration. Internal FLow systems by D.S> Miller is a book that gives K values for reducing tee configurations. Also research paper by Kenji, a JApanese prof gives an empirical corellation to calculate pressure drop in reducing tee.
i could mail u stuff if you pass on ur email id.

Regards,
VK

Can you give me the full reference for the article by the Japanese Professor Kenji?

Thanks

HI VK

i ALSO WILL BE VERY GLAD TO RECEIVE THE COPY OF AN ARTICLE BY PROFESSOR KENJI.

THANKS AND REGARDS
NAZIR EMAIL: mohdnaziruddin@yahoo.com

[Ganesh M]

Hello VK,

 

I came across the same problem regarding the "K factor for unequal Tee". Can you kindly send me the copy of research paper by Kenji or any other related stuffs regarding "K factor for unequal Tee"?

 

My email-id: ganchem29@gmail.com

 

Thanks in advance.

 

-Ganesh

[Minas VP]

You are right. Crane gives equivalent lengths for standard tees and not the "reducing tee" configuration. Internal FLow systems by D.S> Miller is a book that gives K values for reducing tee configurations. Also research paper by Kenji, a JApanese prof gives an empirical corellation to calculate pressure drop in reducing tee.
i could mail u stuff if you pass on ur email id

Regards,
 

I would also like to go through these documents because i am currently doing a hydraulics calculation involving reducer tees..Could you please mail these to me. My mail Id is    minas.vp.5@gmail.com                

 

 

Thank You

[lesplal1564]

vklearner, could you please forward those documents to mateoarias1564@gmail.com as well? I would really appreciate it. Thank you.

 

Mateo