Summary for the F3 example simulation

The flare relief system is a set of relief valves, collection piping, and a flare stack that is used to discard flammable gasses during unplanned over-pressuring of plant equipment. In many plants, the only available data is the fluid temperature, molecular weight, and specific heat ratio, which is known as a Flare Gas component in AVEVA Process Simulation. This example demonstrates a simulation that contains fluids based on these three values rather than individual components. It also demonstrates how you can create hybrid flare networks that use both Flare Gas and compositional fluids.

The objective of this simulation is to:

• Size the pressure relief valves, relief valve inlet pipes, and collection piping network.

• Calculate back pressure for the relief valves to check that high back pressure does not reduce the relieving capacity of the relief valve.

• Use a Flare Gas fluid based on Temperature, MW, and Cp/Cv ratio.

• Use a converter model to take properties such as molecular weight and specific heat ratio from a compositional fluid and create a Flare Gas fluid.

• Demonstrate the ability to use both compositional fluids and Flare Gas in the same simulation.

The following figure illustrates the flare network with Flare Gas and a compositional fluid.