Figure 3.1
Installation Considerations
3.0
Installation
3.1 Site Selection Criteria
Choose a location that
assures a full pipe of water
flowing at or above the
minimum velocity for the
meter. There should not be
any enlargements, diffusers
or obstructions upstream
that would produce a jet or
spiraling flow into the meter.
Ten diameters of straight
pipe upstream and 1
diameter downstream are
recommended to avoid
errors caused by skewed
velocity profiles. See figure
3.1.
A jet caused by a partially
opened valve, a centrifugal
pump, or a pipe enlarge-
ment upstream from the
meter can cause inaccu-
rate registration.
Often such disturbances
can be avoided by locating
the meter on the suction
side of the pump. The
meter will register just as
efficiently on a vertical or
slanting pipe as on a
horizontal line. The straight-
ening vanes eliminate cork-screw effects in the flow profile of water. Flow conditioners may be required in
installations where less than optimum conditions exist. See Figure 3.1.
2.0
Pre-
Installation
2.1 Process Fluid
The FM104 and FM184 MainLine Electronic Propeller Meters are designed to operate with relatively clean
process water. The percentage of solids should not exceed 0.5%. While the propeller shape is designed to shed
debris and the propeller material is durable and somewhat pliable, large solid objects in the flowing stream
could damage or become entangled in the propeller, causing inaccuracy or malfunction. These meterheads will
function despite the presence of small abrasive particles (such as sand) but the life of the propeller shaft
bearings may be reduced.
2.2 Handling Precautions
Although this device is ruggedly constructed, it is a precise measuring instrument and can be damaged
by rough handling or if dropped. If the meterhead is not shipped already installed into a flow tube, care
should be taken to avoid damaging the propeller during installation.
IDS 104/184/194 Page 3
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