Gas Metering
Introduction for Gas Metering Wizard
inSCADA provides a wizard for natural gas measuring stations that automatically creates a project for monitoring, control and reporting needs. Using this wizard, you can make all the settings and configurations required for gas measuring stations in a few minutes. The wizard prepares all the configurations of your project such as:
Connections,
Devices and Frames,
Variables,
Visualizations,
Trends,
Alarms,
Reports,
Station Calculations,
KEY-PAD Management,
C6+ Split Modes,
Pay/Check Metering,
Data Sharing (With dnp3 Outstation for central scada applications or with Modbus TCP Server / Client for other local scada systems).
Gas Metering System Model
inSCADA models gas measuring systems as shown in figure 1.
As seen in the model, inSCADA Gas Metering System is a general model that models gas entries and exits, even pay and check metering systems that contain measurement groups. Here, the main measurement groups GRP01 and GRP02 to which the gas enters, the INT measurement group modeling the internal consumption, and the GRP03 and GRP04 measurement groups that model additional measurement stations at the station exit are shown.
There is no limitation in the measurement line numbers of measurement groups.
inSCADA uses a discipline in naming parameters and variables when creating projects suitable for gas measurement systems. It can automatically generate the project correctly through the template devices named in this discipline and the variables defined within these devices.
Structure of variable names;
STN{x}_GRP{y}_PAY_STREAM{z}_{NAME}
x in the STN{x} is a station number. Model in the Figure 1 models the case that a project can contain 2 stations. As in the below figure, STN{x} value is 01 and 02 for Station 1 and Station 2, respectively. In this case, the names STN01 and STN02 are used in the naming.
The y value in GRP{y} indicates which measurement group exists in each station. As seen in Figure 2, possible group numbers are shown as 01, 02, 03, 04.
The CHK statement may also replace the PAY statement. PAY means that the line is the share measurement line, and CHK is the check measurement line.
z in STREAM{z} represents the measurement line number. It increments according to the number of measurement lines e.g. STREAM01, STREAM02, STREAM03. STREAM00 has a special definition. It represents all lines of the related group. For example,
{NAME} represents the actual definition of the variable, and the prefix of name refers to where it belongs, as described above. In all variable names, the abbreviations used in addition to the details above have a meaning and are important for the correct operation of the system. They are
Abbreviation | Description | Example |
PH | Previous Hour | STN01_GRP01_PAY_STREAM01_PH_LINE_PRESSURE |
PD | Previous Day | STN01_GRP01_PAY_STREAM01_PD_LINE_PRESSURE |
PW | Previous Week | STN01_GRP01_PAY_STREAM01_PW_LINE_PRESSURE |
PM | Previous Month | STN01_GRP01_PAY_STREAM01_PM_LINE_PRESSURE |
PY | Previous Year | STN01_GRP01_PAY_STREAM01_PY_LINE_PRESSURE |
SSH | Snap Shoot Hour | STN01_GRP01_PAY_STREAM01_SSH_CORRECTED_TOTAL |
TOTAL | Total | STN01_GRP01_PAY_STREAM01_UNCORRECTED_TOTAL |
CORRECTED_FLOW_RATE | Uses for Flow Weighted Avarage | STN01_GRP01_PAY_STREAM01_CORRECTED_FLOW_RATE |
The expressions given in the table above are used in variable names. The order and notation is important. InSCADA decides which variables should be processed by looking at these statements.
Step By Step Practice
In this section, we will go over a natural gas station with examples and see how you can quickly create the most suitable project with inSCADA.
Example 1 : Let our measuring station be 2 parallel Turbinmeter measuring lines, a serial ultrasonic measuring line to this turbinmeter measuring line, 1 fuel line for internal need, 1 gas chromotograph. SPIRIT XP3 model flow computer will be used in the measurement lines and RFLO brand correcter will be used in the fuel line.
Step 1 : Adding Device to Device List
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