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Example 2 BS3680 U-Throated Flume
In this example, it is required to calculate to BS3680 the flow through a U-
Throated Flume without any hump. Absolute calculation will be used, and
there is a requirement for an alarm to indicate a low flow condition which
will be set to relay 1. The flow rate is to be displayed in millions of US
gallons/hour and the totaliser is also to record the flow in millions of US
gallons, the resettable totaliser is to be displayed during RUN.
The distance from the end of the transducer horn (dB Mach 3) to zero flow
(P105) is 35 inches and max head (P704) is 15 inches, maximum
flow(P705) which will be calculated by the Ultra unit as 0.1784 Mil.
USG/Hour.
The dimensions of the flume are as follows:
Approach Channel diameter (Dim “A”) P710 = 28 inches
Throat diameter (Dim “B”) P711 = 20 inches
Throat length (Dim “C”) P712 = 40 inches
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