Educational simulation, not a field measurement. The separator pressure is now a changing state, distinct from its outlet backpressure and operating target. Once oil arrives, the inlet PI reads that simulated state and the vessel outline turns green when the displayed pressure reaches the target. The metallic fill stays unchanged. The separate outlet PI reads the prescribed separator outlet backpressure; the inlet PI reads the simulated pressure state.

Select US field units for psi, ft, in and ft/s; clear it for bar, m and m/s. SG and resistance coefficients are dimensionless. Values are converted internally for consistent calculations. Quasi-steady tubing balance: Pbottom − Pvessel = ρgH + (fH/D + K)ρv|v|/2. Separator pressure evolves from flow imbalance: C dPvessel/dt = Qin − Qout. Illustrative capacity C = 0.004337 bbl/psi; outlet equivalent resistance Kout = 1500. The selected choke and flowline losses lie upstream of the inlet PI. These parameters are teaching assumptions, not calibrated separator data. Prior to oil arrival, the space above oil has the prescribed outlet pressure and negligible gas weight.

Reference for single-phase head and friction: Pennsylvania State University, PNG 301, section 6.4, https://www.e-education.psu.edu/png301/node/891. The lumped pressure-capacity extension is an illustrative model assumption. Multiphase flow and detailed separator controls are omitted. Animation and pressure evolution run 40 times faster. Geometry uses compressed independent scales. Gauges: wellhead and bottomhole 0–7252 psi (0–500 bar), separator 0–2176 psi (0–150 bar); values above range remain visible digitally.

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