Table of Contents
Advertisement
3.
INSTALLATION
3.1
Piping Design Precautions
WARNING
Installation of the magnetic flowmeter must
be performed by expert engineer or skilled
personnel. No operator shall be permitted to
perform procedures relating to installation.
IMPORTANT
Design piping correctly, read the following to
prevent damage to flowtubes and to assure
accurate measuring.
(1) Location
IMPORTANT
Install the flowmeter in a location where it is
not exposed to direct sunlight. The minimum
ambient temperature is limited by the minimum
fluid temperature of the flowtube. For more
information, read Chapter 12. 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, inverters
and other power sources in order to avoid
interference with measurement.
(3) Required Lengths of Straight Runs
To maintain accurate measurement, read JIS B
7554 which explains the requirements for upstream
piping conditions of magnetic flowmeter.
The piping conditions we recommend as shown in
Figure 3.1.1 are based on JIS B7554 and on our
piping condition test data.
This is not always enough when the piping line
incorporates multiple conditions at the same time.
<3. INSTALLATION>
When installing two or more magnetic flowmeter on
a single pipe, provide a run of at least 5D between
them.
Gate valve
Reducer
fully open
pipe
5 D or more
2 D or more
0 is allowable 0 is allowable
90-degree bent
Tee
5 D or more 0 is allowable
5 D 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:
Highly recommend to mount valves on the downstream
side so that deviated flows do not occur in the flowtube
and to avoid startup from an empty condition.
*4:
In case the piping conditions are compounded, install
on the straight pipe section where the upstream part is
sufficiently rectified.
(4) Maintaining Stable Fluid Conductivity
IMPORTANT
Do not install the flowmeter where fluid
conductivity tends to become uneven. If
chemicals are fed near the upstream side of a
magnetic flowmeter, they may affect the flow
rate's indications. To avoid this situation, it is
recommended that the chemical feed ports be
located on the downstream side of the flowmeter.
If it is unavoidable that chemicals must be fed
on the upstream side, provide a sufficient length
of straight run (approximately 50D or more) to
ensure the proper mixture of fluids.
(Incorrect)
(Correct)
Upstream side
Downstream side
Figure 3.1.2 Chemical Injection
3-1
D: Flowtube Size
Expander
pipe
10 D or more
2 D or more
Various valves
0 is allowable
10 D or more
2 D or more
F0301.ai
F0302.EPS
IM 01E30D01-01EN
Advertisement
Table of Contents
