Flomec G Series Handbuch für Produktbesitzer - Seite 4
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Turbine flowmeters are affected by both upstream and downstream process
configurations. Turbine flowmeters should always be installed with a minimum of
10 pipe diameters upstream and 5 pipe diameters downstream. The only exception
is the placement of the pumps, valves, etc., on the upstream end. When this
occurs, 20 diameters of straight pipe should be used. The direction of flow is
indicated by the arrow on the turbine. All turbine flowmeters are designed to
measure flow in only one direction.
Check the items below once the turbine flowmeter is installed in the process line.
This will ensure a successful start-up.
1. Before installing the magnetic sensor, make sure that it is functioning properly.
This can be accomplished by checking the ohm resistance. Refer to Checking
Magnetic Pickup in the Troubleshooting section.
2. If a magnetic pickup enclosure is used on a sanitary turbine, discard the seal
cap that is included with the unit. If no enclosure is used, install the magnetic
pickup and slip the seal cap over the magnetic pickup and threads on the
adapter.
NOTE: This is not applicable for units that use a low profile adapter.
3. Check the interconnection cable between the turbine flowmeter and readout
device. Refer to Checking the Cable Assembly section.
4. Make sure that the new or correct K-factor is entered into the readout device.
NOTE: The K-factor is printed on the turbine body. The calibration report included
with the product provides several points along the flow curve.
Initial Start-Up
Turbine flowmeters can be installed in the horizontal or vertical position. When
installing a turbine flowmeter in the vertical position, it is important that the direction
of flow be up through the turbine flowmeter.
A spool should be installed in place of the turbine flowmeter during initial start-up
of a new process line. The process line should be purged, thus eliminating any
solids contained in the line. Once this is completed, the spool can be removed and
the turbine flowmeter installed.
Whenever possible, use 20 straight pipe diameters upstream and down- stream of
the turbine flowmeter. The length of straight pipe upstream and downstream of the
turbine flowmeter can be reduced with the use of flow straighteners or
straightening vanes. A minimum of 10 straight pipe diameters upstream and 5
downstream are required.
NOTE: Control valves should always be installed downstream of the turbine
flowmeter.
The turbine flowmeter should be installed in a location where the process line will
remain full of liquid at all times. Otherwise, when the process line becomes empty
and a valve is opened, the high velocity fluid hitting the turbine flowmeter rotor can
cause severe damage.
INSTALLATION
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