Yokogawa ADMAG AXF - Manual (Page 11)

IM 01E20D01-01E 3-1
3. INSTALLATION
3. INSTALLATION
Based on JIS B7554 "Electromagnetic Flowmeters"
and our piping condition test data, we recommend the
piping conditions as shown in the following figures.
When installing two or more magnetic flowmeters on a
single pipe, provide a run of at least 5D between them.
F08.EPS
D: Flowtube Size
Gate valve
fully open
5D or more
2D
or more
Reducer
pipe Expander
pipe
0 is allowable. 0 is allowable. 10D or more 2D or more
10D or more
Tee
90-degree bent
Various valves
0 is allowable. 5D or more 0 is allowable. 5D or more
2D
or more
Figure 3.1.1 Required Lengths of Straight Runs
*1: Do not install anything in the vicinity that may
interfere with the magnetic field, induced
signal voltages, or flow velocity distributions of
the flowmeter.
*2: A straight run may not be required on the
downstream side of the flowmeter. However, if
a downstream valve or other fitting causes
irregularity or deviation in flows, provide a
straight run of 2D to 3D on the downstream
side.
*3: The valves shall be mounted on the down-
stream side so that deviated flows do not
occur in the flowtube and to avoid startup from
an empty condition.
(4) Maintaining Stable Fluid Conductivity
IMPORTANT
Do not install the flowmeter where fluid conduc-
tivity tends to become uneven. If chemicals are
fed near the upstream side of a magnetic
flowmeter, they may affect the flow rate’s indica-
tions. To avoid this situation, it is recommended
that the chemical feed ports be located on the
downstream side of the flowmeter. If it is un-
avoidable that chemicals must be fed on the
upstream side, provide a sufficient length of
straight run (approximately 50D) to ensure the
proper mixture of fluids.
3.1 Piping Design Pre-
cautions
WARNING
Installation of the magnetic flowmeter must be
performed by expert engineer or skilled person-
nel. No operator shall be permitted to perform
procedures relating to installation.
IMPORTANT
Design piping correctly, referring to the following
to prevent damage to flowtubes and to assure
accurate measuring.
NOTE
This chapter describes the remote flowtube as
an example. The same attention must be paid to
the integral flowmeter.
(1) Location
IMPORTANT
Install the flowmeter in a location where it is not
exposed to direct sunlight. The minimum ambi-
ent temperature is limited by the minimum fluid
temperature of the flowtube (the lining). For
more information, refer to Chapter 6 “OUTLINE”.
The flowmeter may be used in an ambient
humidity where the relative humidity ranges from
0 to 100%. However, avoid long-term continuous
operation at relative humidity above 95%.
(2) Noise Avoidance
IMPORTANT
The flowmeter should be installed away from
electrical motors, transformers, and other power
sources in order to avoid interference with
measurement.
(3) Required Lengths of Straight Runs
To maintain accurate measurement, see JIS B7554
“Electro Magnetic Flowmeters” which explains the
requirements for upstream piping conditions of
magnetic flowmeters.