The representation of mass balance system (e.g. refinery, crude oil stabilization unit, gas processing plant, etc.) is done by creating nodes and streams. Streams represent connection between nodes. If nodes are separate processing unit (e.g. stabilizer, dehydration unit, separator, etc.) then streams are pipes connecting two different units..
The Mass Balance diagram is built by easy to use drag and drop web-based tool. A stream configuration is easily accessed by highlighting a node. The required calculation modules are connected to each stream. First, FluidsNet calculation module is connected to stream for calculation of fluid properties. Then FlowNet module is configured in order to calculate flow rates as final measured output. The Mass Balance diagram can be as complex as entire processing plant, or subset, such as oil or gas system.
The system also calculates combined uncertainty at each stream. Combined uncertainty of cumulative mass of each stream is calculated based on ISO 5168 standard. Then the system performs data reconciliation to identify gross error. Gross error of each stream is compared against criteria, which is usually combined uncertainty, and then any deviation will be flagged. This flag will be triggered for health check of instrumentation used for that stream.
