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We have a flowmeter before the header, so we know the total flowrate. Assume the flowmeter is at 5% uncertainty.

Two of the risers/pipes has flow meters attached to it. Assume that each flow meter is at 5% uncertainty.

The third riser/pipes flow rate is gained by inferential methods, i.e.,

3rd Riser Flow rate = Total Flow rate - (Summation of flow rate on the other two pipes/risers)

May question is, what is the uncertainty of the measurement for this 3rd riser? How do we do it?

Does the 3rd riser measurement uncertainty = 5% + 5% + 5% = 15%?

Looking forward for your answers & thanks in advance,