Abstract
The flow profile in a meter run is controlled by the velocity profile upstream from the header and the difference in height between the buried header and the meter run. The influence of acceleration/deceleration differentials when the flow is entering the individual meter run is negligible if the height difference is above a minimum. Depending on the actual height difference h, the minimum straight upstream length specified in Table 3 in ISO standard 5167 for two 90° bends in different planes is too long (if h is high) or conversely too short (if h is small), if the flow profile upstream from the header is undisturbed.
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