Onicon F-2600 Manual do Utilizador descarregar pdf (Página 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 ange-style meter between two conventional pipe anges of the same nominal

size as the ow meter. If the process uid 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 ow meters are not suitable for two-phase ows (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 ow before installing the ow meter.

When installing the meter make sure the ange marked with a ow arrow is positioned

upstream of the outlet ange, with the arrow head pointing in the direction of ow. (The

mark is on the ange 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 ow. Installing the meter opposite this direction will result in completely inaccurate

ow measurement. To install the meter:

1. Conrm that the installation site meets the required minimum upstream and

downstream pipe diameters. Turn off the ow 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 ange stamped

with a ow arrow on the upstream side, with the arrow head pointing in the direction

of ow. Position a gasket in place for each side. Make sure both gaskets are smooth

and even with no gasket material extending into the ow prole. Obstructions in the

pipeline will disturb the ow 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 ange bolts.

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