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The equations given in ISO 5167 are given below.

- C is the discharge coefficient (the equation is only valid for the three standard tap positions defined below)
- Re is the Reynolds number
- L
_{1}and L_{2}are the upstream and downstream tap positions (ft) - P
_{1}and P_{2}are the upstream and downstream pressures (psig) - D
_{1}and D_{2}are the pipe and orifice diameters (inches) - V is the liquid velocity in the pipe (ft s
^{-1}) - ρ is the liquid density slugs ft
^{-3} - μ is the liquid viscosity lb-sec ft
^{-2}

ISO 5167 defines three different tap positions for the pressure probes (Corner, D-D/2 and Flange taps). These positions the values of L

_{1}and L

_{2}, and are given below

- Corner Taps: L
_{1}= L_{2}= 0 - Flange Taps: L
_{1}= L_{2}= 1 inch - D-D/2 Taps: L
_{1}= D_{1}, L_{2}= D_{1}/2

- Guess a value of Re,
- Calculate C and Q
- Use C and Q to calculate Re
- Use Goal Seek to change the value of Re we guessed in Step 1 until it's equal to the value calculated in Step 3

Download Excel spreadsheet to size an orifice meter with ISO 5167

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