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The measuring of flow rate is very difficult
and it has various measuring methods for liquids, gases and
vapors.
For configuring your flow rate metering as simple and quick
as possible especially for LNGC - you can get the high accuracy
and speedy measured results with GMB flowmeter system. Since
GMB flowmeter system is the PLC based on the calculation module,
it is the ideal solution to use GMB flowmeter system for the
many application of measuring hydrocarbon gases or liquids.
And GMB flowmeter system can adopt any standardized international
code that is currently used for calculating the flow rate.
As there are many measuring methods drew by the type of flowmeter
like vortex, orifice, pitot tube, etc. the appropriate calculation
standard code should be selected.
Several standardized international codes are as bellow.
- AGA and API : chapter 21 compliment
- AGA 3 : orifice plate
- AGA 7 / ISO9951 : rurbine meters
- AGA 8 / ISO12213-2 : compressibility
Therefore the flexible GMB flowmeter system can meet your any
requirements.
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The values from individual
sensors are calculated on GMB flowmeter system for compensation
and what you want to determine is provided as mass or
volume quantity of gases.
On account that any type of flowmeter can be applied to
the GMB flowmeter system, the maximized flexibility is
provided to you.
And GMB flowmeter system is configured with HMI as well
that is designed to provide useful monitoring for customers.
For all of the results from flowmeter system is available
to communicate with IAS through RS 485 MODBUS.
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There are several measuring points of flow
rate for LNGC. Generally GMB flowmeter system has the
MPA or vortex type of flowmeter amongst many type of flowmeter.
Each advantage of using them is as bellow.
| MPA
(Multi Point Averaging Pitot Tube) type |
- More accurate than orifice, venturi and APT
- Accuracy if discharge coefficient(Cd) is +/- 0.2%
of rate within 12:1 range
- Low permanent pressure loss
- Highly resistant to mechanical vibration
- Easy to install
- High measuring accuracy with wide rangeability
- No moving parts or holes that can clog
- High rangeability / turn down ratio
- Possibility of using even dirty liquids
GMB flowmeter system uses multiple processors and has
an integral floating point calculation unit which allows
very high calculation speed and which permit high performance
at the full loading of multiple runs.
The advantage of using GMB flowmeter is as bellow in
compered with DCS.
- I/O scan time : very fast (mil second)
- Calculation time : fast
- Accuracy : high
Scan time and calculation time is very important for
flow accumulation. Because an error in calculation or
sensing is increased as time goes on. Therefore DCS
that has the longer processor time than GMB flowmeter
system is inaccurate as time goes on.
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- User memory : max. 16K words total
(12K words for data or prog.)
(4K words for data only)
- Number of channel : 32 channel
- Program scan time : 1 ms
- I/O scan time : 0.225 ms
- Environmental conditions
- Operating temperature : 0~60 °C
- Relative humidity : 5~95% (without condensation)
- MODBUS RTU (Master/Slave)
- Ethernet
- Profibus DP
- Application temperature limit : 600 °C
- Accuracy : 0.2%
- Process temperature range : -200~400 °C
- Accuracy : < 1% of reading for Re >20000
- < 1% of full scale for Re between 4000~20000
Self-monitoring and totalizing
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