1) Std Ideal Liq Vol Flow (standard input on Aspen Hysys)

Volumetric flow is calculated based on ideal mixing of pure component ideal densities at 60 °F (15 °C).

2) Liq Vol Flow @Std Cond
Volumetric flow is calculated rigorously at the standard reference state for volumetric flow rates, and reflects non-ideal mixing effects.

3) Actual Volume Flow (not a direct input in Aspen Hysys)
Volumetric flow is calculated rigorously at the flowing conditions of the stream (i.e., at stream T and P).