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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
- L1 and L2 are the upstream and downstream tap positions (ft)
- P1 and P2 are the upstream and downstream pressures (psig)
- D1 and D2 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 L1 and L2, and are given below
- Corner Taps: L1 = L2 = 0
- Flange Taps: L1 = L2 = 1 inch
- D-D/2 Taps: L1 = D1, L2 = D1/2
- 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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