Yokogawa digitalYEWFLO (DY) - Manual (Page 32)

IM 1F2B4-01-YIA
Page 36
INSTALLATION
III. INSTALLATION
Before installing your YEWFLO you will need to gather the following tools:
Wafer Style:
1.
Gaskets - self-centering preferred. In no case should the I.D. of the gaskets be smaller than
the I.D. of the meter.
2. Wrenches - Two of a size appropriate for the nuts supplied.
3. Screw driver - A small Phillips or flat blade type may be used to connect lead wires.
4. Sufficient wire to reach from the meter signal converter to the power source, receiving
device. See the Wiring Section of this manual for wire recommendations.
5. Stud bolts, washers and nuts are supplied with the meter
Flanged Style:
1.
Nuts, bolts and washers appropriate in type, size, material and quantity for the flange as
specified by ANSI standards.
2. Gaskets - self-centering preferred. In no case should the I.D. of the gaskets be smaller than
the I.D. of the meter.
3. Wrenches - Two of a size appropriate for the nuts supplied.
4. Screw driver - A small Phillips or flat blade type may be used to connect lead wires.
5. Sufficient wire to reach from the meter signal converter to the power source, receiving
device. See the Wiring Section of this manual for wire recommendations.
3.1 P
IPING
R
EQUIREMENTS
To obtain maximum performance, the vortex flowmeter should be installed in a pipe with a straight
run the same size as the nominal size of the meter. On the upstream side, the straight run depends on
what is in the pipe ahead of the meter. In most installations a maximum of 20 diameters will be
sufficient. The pipe on the downstream side of the meter should always be at least 5 diameters. The
combination of flowmeter with upstream and downstream pipe is referred to as the metering run.
Refer to the following illustrations for the minimum straight pipe for your installation. Note that in
all installations the mating pipe on either side of the vortex meter must match the meter size. In many
applications proper sizing may recommend using one meter size smaller than the existing pipe.
When this is the case, concentric reducers should not be directly attached to the flowmeter, but
installed on either end of the metering run as shown. In any case, the guidelines for orifice plate
installations as published by the ASME will be safe to follow.
IDEAL
Figure 3.1.1: YEWFLO upstream side of valve