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755 M1 016 B
29-10-2008
1. DEBITFLO LOCATION
Please consider carefully all following requirement to choose a suitable location of the open channel DEBITFLO.
UPSTREAM SIDE SURROUNDINGS
To respect the minimum straight flow distance before the Venturi: the approach channel of the complete DEBITFLO is sufficient.
However, it is better to
limit the slope of the input line at a minimal value
.
In case the slope is too high,
an undertow effect will be the consequence,
visible in the channel. In this case, the complete system
will be operational only when the undertow (wave) is at a
greater distance than 30 times the highest water height of the DEBITFLO
(see the flow rate table at 100%).
If the flow input line is not in the axis of the channel axe or through a valve, it is necessary to built up a longer approach channel.
When the approach channel width is lower than the input line, it is necessary to built up a restriction input line in order
to avoid
turbulences.
The best solution is to set up a basin for tranquilization
just before the approach channel, larger than the DEBITFLO and an
input flow through a vertical pipeline.
DOWNSTREAM SIDE SURROUNDINGS
The most important is to procure a free draining.
The DEBITFLO may
never get a drop pressure
back due to a bad drain off.
So, do not install a pipeline with a smaller diameter than the diameter of input line. Better to choose a really greater diameter and
to design it with the highest possible slope value
Never the height of downstream is over 80% of the upstream height.
The most convenient when it is possible is to let
the flow output falling freely
in a cataract way.
2. LEVELLING THE DEBITFLO
DIRECTION
- Install the DEBITFLO with its axis in the same axis of the flow.
RAISING
- The bottom of the channel should be at the height of the input line bottom.
LEVELLING
- Please use a bubble indicator to assure a perfect horizontal installation.
