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Pressure drop in half pipe coils

Pressure drop in half pipe coils

Pressure drop in half pipe coils

(OP)
I am looking for some articles or equations to calculate the pressure drop in half pipe coils that make up a reactor jacket.   

Thanks

RE: Pressure drop in half pipe coils

I've had good success using the equation in Crane TP410 for more than one bend.  You have to calculate two diameters.  One from 4 x hydraulic radius to use for the Reynolds Number and the other for equivalent flow area of a round pipe for use for the velocity terms.  I may have more input on this tomorrow when I'm in my office.

Good luck,
Latexman

RE: Pressure drop in half pipe coils

In my Crane TP410 (25th printing in 1991) the derivation of their "Resistance of Bends" equation starts on page 2-12 and is presented in final form in Equation 2-20:

KB = (n-1)(0.25.fT.Pi.(r/d) + 0.5.K1) + K1

n = number of 90o bends
fT = fully turbulent Darcy friction factor
r = radius of bend
d = diameter of pipe (I use 4 x RH for 1/2 pipe)
K1 = K of 1 bend from Table on page A-29

r/d        K1
1          20.fT
1.5       14.fT
2          12.fT
3          12.fT
4          14.fT
6          17.fT
8          8.fT
10        10.fT
12        12.fT
14        14.fT
16        16.fT
20        20.fT

When I put KB into a pressure drop equation I use d = equivalent flow area diameter, square root of (4.A/Pi), so the velocity is correct.

It has been field tested many, many times by me over the years.

Good luck,
Latexman

RE: Pressure drop in half pipe coils

(OP)
Thanks
I will give it a test against the method suggested by 25362 and let you know how they compare.

Thanks

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