Fluxo Soluções
 / January 2012

Daniel will measure the flow of gas from Mexilhão

A Daniel fiscal gas metering station will measure onshore the flow of all the natural gas produced by the Mexilhão field. The contract was signed between Daniel, a company belonging to the Emerson Group, and Consórcio Caraguatatuba, formed by Queiroz Galvão, Camargo Corrêa and Iesa, in March.

The fiscal gas flow measurement station has a maximum capacity of 20 million m³/day (@20°C, 1 atm) and consists of a 26” 900# inlet and outlet header, with three flow measurement sections, with 2 lines operating with a capacity of 50% of maximum flow and 1 line in stand-by (2+1 configuration), consisting of ball valves with limit switches with Fieldbus Foundation, Rosemount pressure and temperature transmitters with Fieldbus Foundation, valves 18” Daniel plate holder – Senior Orifice Fitting – Controlwave redundant flow computer from Bristol, in addition to an in-line chromatographic analysis system for Danalyzer 500 natural gas.

The main differential of this measurement station is its automation architecture that uses a “redundant flow computer” unit with two parallel CPUs, generating only a historical file and an audit trail. In this case, the redundant flow computer is normally supplied as a single flow computer, where the instrument outputs and communication ports are single and only the CPU, firmware and applications are doubled. A periodic update routine allows the configuration and the entire history file to be mirrored, so that when there is some kind of failure and the stand-by CPU has to be activated in place of the main one, the flow computer will behave as if it were a single flow computer.

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