The stream table is your source of truth
A new engineer's first job on any model is to read the stream table and prove the balances close. Every stream's flow, temperature, pressure, phase and composition sit in one grid. If total mass in ≠ total mass out, the model is wrong — full stop, before you trust a single duty or purity.
The discipline: run, open the stream table, check the overall mass balance, then check the few numbers your decision actually depends on (a key purity, a recovery, a duty).
Before believing any result, confirm the stream table's balances close.