ro-bre

8/10/2019 RO-BRE

1/4

Posted on September 2, 2011 by Harlan Bengtson

Where to Find Spreadsheets for ISO 5167 Orifice Plate Flow Meter

CalculationsFor Excel spreadsheets to makeISO 5167 orifice plate flow metercalculations, click here to visit our spreadsheet

store. Why use online calculators or try to use the incredibly long ISO 5167 equations for hand calculationswhen

you can buy a spreadsheet for gas flow or liquid flow, large bore or small bore ISO 5167 orifice

plate flow meter calculations for only $15.95 each. Read on for information about the use of an Excel

spreadsheet for large bore and small bore orifice meter/gas flow rate or liquid flow rate calculations.

Orifice Meter Background for ISO 5167 Orifice Plate Flow MeterCalculations

For background on orifice meters and the orifice meter coefficient, see the

Low Cost Easy to Use Spreadsheets for Engineering Calculations Available at

Engineering Excel SpreadsheetsAt Engineering Excel Spreadsheets, we

have low cost, easy to use spreadsheets

for engineering calculations, including

pipe flow, flow measurement,

stormwater measurement, heat transfer

coefficients, open channel flow,

structural analysis of beams, and more.

5167 orifice plate flow meter Excel spreadsheetLow Cost Easy to... http://www.engineeringexcelspreadsheets.com/2011/09/iso-5167-orific...

4 11/19/2014 3:18 PM

8/10/2019 RO-BRE

2/4

articles, Excel Spreadsheets for Orifice and Venturi Flow Meter Calculations

and Calculate an Orifice Coefficient with ISO 5167. The diagram at the left

shows the general orifice meter configuration and some of the parameters

used in calculations. Equations from ISO 5167-2:2003 are presented in the

next section.

Equations for ISO 5167 Orifice Plate Flow Meter Large Bore Calculations

The equations for pipes with diameter between 2 in. and 40 in (50 mm to

1000 mm) are given in Reference #1 at the end of this article, ISO

5167-2:2003. The equations are summarized here. The commonly used

equation for compressible fluid (gas) flow rate is shown at the right, where

the parameters are defined as follows:

Q = flow rate through pipe and meter, cfs (m /s for S.I. units)

C = orifice discharge coefficient, dimensionless

A = orifice area, ft (m for S.I. units)P = upstream absolute pressure in the pipe, lb/ft (kN/m for S.I. units)

P = pressure at the downstream pressure tap, lb/ft (kN/m for S.I. units)

= D /D = orifice diam./pipe diam., dimensionless

Z = compressibility factor of the gas at P , T

R = Ideal Gas Law Constant = 345.23 psia-ft /slugmole- R ( or 8.3145 kN-m/kgmole- K

for S.I. units)

MW = molecular weight of the gas

T = upstream absolute temperature in the pipe, R ( K for S.I. units)

Y = Expansion Factor see equation for Y below

Y = 1 - (0.351 + 0.265 + 0.93 )[ 1 - (P /P ) ]

where: k is the Specific Heat Ratio (C /C ) of the flowing gas

The orifice coefficient, C , can be calculated from the following equations:

Where Re is the Reynolds number in the pipe ( Re = DV/)

An Excel Spreadsheet as an Orifice Meter/Gas Flow Calculator

The Excel spreadsheet template shown below can be used to calculate gas flow rate, required orifice diameter, or

pressure difference across the orifice, if the other two are known. This spreadsheet is for large bore pipes (2 in. to

3

o

o

2 2

12 2

22 2

o 1

1 1

3 o o

1o o

4 82 1

1/k

p v

o


4 11/19/2014 3:18 PM

8/10/2019 RO-BRE

3/4

40 in diameter) and uses S.I. units. The image shows just the first page of the worksheet to calculate gas flow

rate. Why bother to make these calculations by hand? This Excel spreadsheet and others with similar

calculations for ISO 5167 orifice plate flow meter calculations are available in either U.S. or S.I. units at a very low

cost (only $14.95 each) in our spreadsheet store. There are also spreadsheets for large bore orifice meter

calculations for liquid flow and for small bore orifice meter calculations (gas flow or liquid flow). The small bore

spreadsheets are for pipes with diameter between 1/2 inch and 1 1/2 inches (12 mm to 40 mm), and use slightly

different equations from ASME MFC-14M:2001.

References:

1. U.S. Dept. of the Interior, Bureau of Reclamation, 2001 revised, 1997 third edition, Water MeasurementManual.

2. International Organization of Standards - Measurement of fluid flow by means of pressure differential devices

inserted in circular cross-section conduits running full. Reference number: ISO 5167-2:2003.

3. Bengtson, Harlan H.,Flow Measurement in Pipes and Ducts,An online continuing education course.

4. Bengtson, Harlan H. Orifice Gas Flow Calculation Excel Spreadsheets, an online blog article.


4 11/19/2014 3:18 PM

8/10/2019 RO-BRE

4/4

About Harlan Bengtson

Dr. Bengtson has B.S. and M.S. degrees from Iowa State University and a PhD from the University of Colorado, all in Chemical

Engineering. He is now retired after 30 years in engineering education, in teaching and administrative positions. His areas of

expertise are environmental engineering, hydrology, engineering science and renewable energy. He is a licensed Professional

Engineer in Missouri. He did consulting work while in academia and had prior industrial experience. Dr. Bengtson has authorednumerous publications, presentations and technical reports. He is currently active as a technical writer.

View all posts by Harlan Bengtson

This entry was posted in Pipe Flow Measurement and tagged ASME MFC-14M:2001, expansion coefficient, ISO 5167, ISO 5167-2:2003, orifice coefficient, orifice diameter,

orifice meter, S.I. units. Bookmark the permalink.

Low Cost Easy to Use Spreadsheets for Engineering Calculations Available at Engineering Excel Spreadsheets

roudly powered by WordPress. Install WordPress


4 11/19/2014 3:18 PM

ro-bre

Documents