Process mode for the F3 example simulation

The purpose of Process mode is to size the relief valves and provide initial pipe sizes at the required or rated flow rates. Use the following sizing criteria for new systems:

• Size relief valves based on the required flow rate by selecting an orifice letter so that the required area is less than the calculated area.

• Estimate the inlet pipe size for the relief valve such that the pressure drop is less than 3% of the specified pressure of the relief valve at the rated flow to prevent relief valve chatter (3% rule).

• Estimate the tail pipes and collection laterals pipe sizes at the required flow rate and on a velocity or pressure drop sizing criteria. You must confirm the Lateral and Header sizing in Fluid Flow mode and the individual tail pipes sizes at rated flow.

• Model inlet pipes with the Incompressible flow equation. Model all other pipes with the Isothermal flow equation according to the API 520 recommended practice.

• Specify the flare gas flow and pressures at each source to determine the initial pressure profile for Fluid Flow mode.