ONICON F-2600 - Manual (Page 23)

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F-2600 & F-2700 Vortex Flow Meter Manual 02/15 - 0808-7 / 19204 Page 23
2.2.2 Flange-Style Flow Meter Installation
Install the flange-style meter between two conventional pipe flanges of the same nominal
size as the flow meter. If the process fluid is a liquid, make sure the meter is located where
the pipe is always full. This may require locating the meter at a low point in the piping
system. Note: Vortex flow meters are not suitable for two-phase flows (i.e., liquid and gas
mixtures). For horizontal pipelines having a process temperature above 300° F, mount the
meter at a 45° or 90° angle to avoid overheating the electronics enclosure. To adjust the
viewing angle of the enclosure or display/keypad, see page 34 and 35.
Figure 7. Flange-Style Flow Meter Installation
!
CAUTION
When using toxic or corrosive gases, purge the line with inert gas for a minimum of four hours at
full gas flow before installing the flow meter.
When installing the meter make sure the flange marked with a flow arrow is positioned
upstream of the outlet flange, with the arrow head pointing in the direction of flow. (The
mark is on the flange adjacent to the enclosure mounting neck.) This ensures that the
sensor head is positioned downstream of the vortex shedder bar and is correctly aligned to
the flow. Installing the meter opposite this direction will result in completely inaccurate
flow measurement. To install the meter:
1. Confirm that the installation site meets the required minimum upstream and
downstream pipe diameters. Turn off the flow of process gas, liquid or steam. Verify
that the line is not pressurized.
2. Seat the meter level and square on the mating connections with the flange stamped
with a flow arrow on the upstream side, with the arrow head pointing in the direction
of flow. Position a gasket in place for each side. Make sure both gaskets are smooth
and even with no gasket material extending into the flow profile. Obstructions in the
pipeline will disturb the flow and cause inaccurate measurements.
3. Install bolts in both process connections. Tighten the nuts in the sequence shown in
Figure 5. Check for leaks after tightening the flange bolts.