The minimum discharge rate for a wholesale liquid measuring shall not exceed which percentage of marked discharge?

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The rule uses a fixed reference: the device’s marked (rated) discharge. It’s about keeping the meter in its reliable, accurate operating range. By setting the minimum discharge to not exceed 20% of that marked discharge, you ensure the flow remains within a range where the mechanism delivers consistent measurements and avoids the nonlinearity or errors that happen at very low flows. Using a percentage of marked discharge provides a stable standard across different sized units, rather than tying the limit to actual flow, which would vary with conditions. That’s why 20% of the marked discharge is the correct threshold.