Sierra INNOVA-FLO 220 - Manual (Page 18)

Chapter 2 Installation Series 220/221 Instruction Manual
Wafer-Style Flow Meter Installation
Install the wafer-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 lo-
cating the meter at a low point in the piping system. Note: Vortex flow me-
ters 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-degree angle to avoid overheating the electronics enclo-
sure. To adjust the viewing angle of the enclosure or display/keypad, see
page 2-17.
Caution!
When using toxic or cor-
rosive gases, purge the
line with inert gas for a
minimum of four hours
at full gas flow before
installing the flow meter.
Figure 2-3. Wafer-Style Flow Meter Installation
When installing the meter make sure the section marked “inlet” is positioned up-
stream of the outlet, facing the flow. This ensures that the sensor head is posi-
tioned 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. Turn off the flow of process gas, liquid or steam. Verify that the line is
not pressurized. Confirm that the installation site meets the required
minimum upstream and downstream pipe diameters.
2. Insert the studs for the bottom side of the meter body between the pipe
flanges. Place the wafer-style meter body between the flanges with the end
stamped “inlet” facing flow. Center the meter body inside the diameter
with respect to the inside diameter of the adjoining piping.
3. Position the gasket material between the mating surfaces. 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.
4. Place the remaining studs between the pipe flanges. Tighten the nuts in the
sequence shown in Figure 2-2. Check for leaks after tightening the flange
bolts.
2-4 IM-22