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Visualization and control of the gas metering station in Shurijeh, Iran

July 9, 2014 | Bretislav Valek

The metering system comprises two 20” meter runs with ultrasonic gas flow meters communicating via the Modbus RTU protocol (RS-485). Each meter run has a capacity of 100 % for custody transfer metering.


Note: Meter run = a piece of pipe that is equipped with all necessary instruments for custody transfer flow metering


Each meter run is equipped with the following elements:


  • Two motor-operated isolation valves at the meter run's inlet and outlet
  • Ultrasonic gas flow meter
  • Absolute or gauge pressure transmitter
  • Density transmitter
  • Temperature transmitter


Control system

The elements of each meter run are wired to the flow computing, monitoring, and supervisory cabinet, which is installed in the control room. The supervisory software – Reliance SCADA/HMI (Reliance Control Server) – is installed on the main server and displayed on the control panel.
A client PC and two printers are located in the operator's room. The client PC is equipped with client supervisory software (Reliance Control) and is connected to the server through
a redundant Ethernet link. The software has different access levels, which protect the system against unwanted access. Required field and calculated signals are transferred to the distributed control system. The system is equipped with a Siemens SIMATIC S7-300 PLC to control the operation of the motor-operated valves.


The Reliance SCADA system provides the following functionality:


  • Modification of operational parameters and settings, such as alarm and deviation limits or gas composition
  • Graphical-oriented operator screens displaying important metering data–related information from the flow computers, flow meters, transmitters, and valves
  • Data transparency towards the operators
  • Control of the motor-operated valves through the Siemens SIMATIC S7-300 PLC
  • Operating feedback from the motor-operated isolation valves
  • Generating custody transfer reports, daily/monthly reports; they are stored on the disk and, when required, printed automatically
  • Archiving of reports, alarms/events, and trends
  • Secure environment by protecting the system from unauthorized access
  • Alarm management; alarms are derived from primary input signals as well as from calculated figures, they can be printed on the alarm printer, and are stored on the hard disk; alarm messages and acknowledgements are also reported
  • Real-time and historical trending for all major signals in the system
  • Monitoring of all important signals with high and low limits; generating an alarm if any of the signals is out of the normal range
  • Human–machine interface with which the operator can monitor, for example, all live values, calculated values, alarm/event messages, parameters, and settings in a number of graphical displays


Examples of visualization windows



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