5 replies to this topic

[stuuuuudent]

Hi all,
I am looking for a formula which would give the optimum pipe diameter as a function of flow rate, density, maybe viscosity etc.

The correlation for steel and stainless steel can easily be accessed, for example they are given in C&R Vol 6. However, if my tubes are made of some other material (cupronickel) is there a way i can find a correlation specifically for this material or a general correlation not depening on material?

Thanks,

[Shivshankar]

student,

FLow= Velocity X Area

Dinsity=Mass/ Volume

Area =3.14Diameter square/4

Pressure X Volume= Number of moles X Gas constant X Temperature (PV=nRT)

If you know the concept of Hydraulic diameter and Reynolds Number, Kinematic, dynamic viscosity and bernoulis equation you can calculate it.

Attached some documents for your help.

Regards
Shivshankar

Attached Files

•  overheads.pdf   660.63KB   86 downloads
•  formula-sheet.pdf   117.73KB   104 downloads

[stuuuuudent]

Yeah, but I have liquids rather than gases.

The formula C&R Vol 6 gives for steel pipe is d=293 x M^0.53 x rho^-0.37 and for stainless steel d=260 x M^0.52 x rho^-0.37 where m is mass flow rate:

So I guess there should be a similar correlation for other materials, only the constant is different?

[Shivshankar]

Student,

Can you attach your calculation copy ?

See this documents

Regards
Shivshankar

Attached Files

•  Piping and instrumentation.pdf   273.07KB   124 downloads
•  econdia.pdf   78.17KB   67 downloads

[stuuuuudent]

Yeah, Shivshankar,
From the piping and instrumentation document page 219 is the one I refering to. In the beginning there are some genral guidelines and in the end the otimum diameter for steel and stainless steel is given. Do you think I can find a similar correlation for cupronickel pipes from somewhere, thanks! I am actually using this information to design my heat exchanger, in particular for nozzle design

[Shivshankar]

student,

you can refer

http://www.wlv.com/p...DataBookIII.pdf

http://www.wlv.com/p...-databooks.html

Regards
Shivshankar