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Anonymous Poster

Want to know the differential pressure and flow

07/14/2009 3:35 AM

Sir,

I have an orifice installed in the water line .Only data given on it are d=39.94

80NB,and FT-001. the pipe line size is 4 ".

I have installed the DP meter having range 0-2600mmwc.

Now what will be the range of the flow in m3/hr.

and if I only have the orifice data then how I can calculate the DP range for 20M3/hr

Regards,

Vikash Suthar

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Anonymous Poster
#1

Re: Want to know the differential pressure and flow

07/14/2009 5:18 AM

SAR,

For Calculating orifice bore dia/Flow U Should know Flowing pressure & Temperature which Thou shall get from Process Flow Diagram based on which sizing can be done

For More Info U can refer ISO5167 /SHELL DEP or Try using Instrucalc

Regards

Jose John

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Join Date: Nov 2008
Location: Johannesburg
Posts: 295
Good Answers: 12
#2

Re: Want to know the differential pressure and flow

07/14/2009 6:06 AM

Hi there,

As stated in the previous post - there are a few more things you need to know.

The basic formulas for determining the flows are as follows:

V = k*sqrt(h/p)

Q = k*A*sqrt(h/p)

W = k*A*sqrt(h*p)

Where:

V = Velocity

Q = Volumetric flow rate

W = Mass flow rate

A = Cross-sectional area of the pipe

h = Differential pressure between points of measurement

ρ = the density of the flowing fluid

k = a constant that includes the ratio of cross-sectional area of pipe to cross-sectional area of nozzle or other restriction, units of measurement, correction factors, and so on, depending on the specific type of head meter.

If you gather the outstanding data and use the above mentioned formulas - you will be able to calculate your flow rate.

Regards,

Craig

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Join Date: Jul 2009
Posts: 5
#3
In reply to #2

Re: Want to know the differential pressure and flow

08/06/2009 12:02 PM

sir,

how to calculate the k value, is it mentioned on the orfice

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