Process description for the F1 example simulation

The process consists of the following:

• Four sources of flare gas at different pressures that propagate through a set of four relief valves, a piping collection system, and a flare stack, which burns the gas.

• Inlet pipes that we size such that the pressure drop is less than 3% of the specified pressure in the respective relief valves to prevent relief valve chatter.

• Tail pipes and downstream flare header piping that we size to have less than 10% superimposed back pressure (for conventional valves) so that high back pressure does not reduce relieving capacity.

• A pipe enlarger to calculate pressure recovery due to gas acceleration.

• A small diameter tail pipe after relief valve RV1, which exhibits choked flow.