FlowCERT
Flow Cert Second Edition.pdf - Pulsar Process Measurement
Flow Cert Second Edition.pdf - Pulsar Process Measurement
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BS3680 Weirs (P700 = 3)<br />
Point of Measurement<br />
The transducer must be above the maximum head P704 by at least the near<br />
blanking distance P107.<br />
For a Rectangular and V-notch weirs, the head is measured at a point 4 to<br />
5 times the maximum head upstream from the weir plate, to ensure the<br />
surface of the liquid is not affected by turbulence or drawdown.<br />
(See DRWG 8)<br />
Calculations<br />
BS 3680 Rectangular Weir<br />
ABSOLUTE<br />
If the flow calculation is to be absolute P702 = 1 the flow will be calculated<br />
using the formula: q = C e 2/3(2gn) 0.5 b e h e<br />
1.5<br />
Where: q = flowrate<br />
Ce = discharge coefficient calculated by <strong>FlowCERT</strong> P723<br />
gn = gravitational acceleration (nominal value = 980.66 cm/s 2 )<br />
be =effective approach width where b is approach width<br />
(Dim“A”) P710<br />
he = effective head<br />
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