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| How
to Install Flowmeter |
To ensure meter operation
performance and measuring accuracy, please pay attention
to:
* Metal Variable Area Flowmeter must be installed vertically
which verticality keeps less than 2o, fluids flows from
bottom to top;
* When install flowmeter on process pipeline, bypass
pipe should be installed to handle with malfunction
conveniently or not to affect production during flushing;
* To ensure meter accuracy, more than 5D straight pipe
should be at upstream and 250mm straight pipe at downstream;
* Require to equip magnetic filter if ferromagnetic
material contained in fluids;
* Require to equip filter between valve and straight
pipe once solid impurity exists in measured medium;
* For gas measurement, pipe pressure should be not less
than 5 times pressure loss of meter to ensure float
working stably;
* When the fluid temperature is high over 220≧ or so
low as easy to crystallize, it needs to take measures
of thermal insulation protection; jacket type should
be applied for heating or cooling;
* It is necessary that all standards of the pipe flange,
fastener, sealing gasket should conform to the standard
of meter flange to ensure meter operation normally;
* Generally speaking, the metal variable area flowmeter
do not require maintenance after normal operation. Some
meter defects always happened during commissioning due
to some dirty material in the pipe to cause float be
blocked, and the pointer of indicator is stopped fixedly.
At this time, first close the valves on both sides of
the flowmeter, then disassemble the upper flange of
the flowmeter, move out the float to clean and then
reassemble. Care that the flange nuts should be tightened
up evenly and hold the gasket;
* The flange on the process pipeline must be coaxial
and parallel to the flange of the meter. To avoid the
pipe vibration, suggest supporting the pipe. Control
valve should be installed at the downstream of the flowmeter;
* Because the meter transmits signal by magnetic coupling,
therefore to ensure the meter performance, ferromagnetic
matter should not exist around the meter 10m at least;
* Gas meter is calibrated under specified pressure.
If the gas on outlet of the meter is exhausted out to
atmosphere directly, it would produces pressure loss
at the float, and causing the data distortion. Therefore,
require to install an exhausting valve at the meter
outlet under this condition;
* Pay attention to install meter with PTFE liner. PTFE
will be distorted under uneven pressure, so flange nuts
should not be tightened unevenly; for flowmeter with
LCD display, ensure to avoid sun shining indicator directly
during installation, or would ruduce life of LCD.
Table of Max. torque
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