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What is the Flow Computer application?
The flow computer application is a large C or C++ application that executes in the SCADAPack controller. This application takes static pressure, differential pressure and temperature readings from remote field sensors, and calculates the flow rate and accumulated flow of natural gas based upon the industry-standard algorithms AGA-3 (1985), AGA-3 (1992), AGA-7 and V-Cone. Depending on the type of SCADAPack controller used, up to 10 individual flow runs can be calculated simultaneously. The flow computer application also logs the flow data as well as events and alarms to controller memory. A number of custom Modbus commands are available for dynamically writing-to or reading-from the flow computer application via the controller’s IO database registers.
The gas flow computer application may be run at the same time in the controller as a TelePACE Studio ladder logic or ISaGRAF logic application. This allows the controller to not only calculate gas flow, but to also provide local control to the controller installation. If local logic control needs to be implemented in C or C++, this local control logic can be appended to the flow computer application source code itself.
