The two-stage acceptance system is implemented as follows:

Two-stage acceptance system
├─ Completion acceptance
│   ├─ Visual inspection of documents, drawings and the plant building — Design requirement confirmation
│   ├─ System visual inspection ─────────────────┐
│   ├─ Trial operation of individual units and systems ──┼─ Installation qualification
│   ├─ Filter leak test (completed by the contractor) ───┘
│   └─ Adjustment testing (completed by the contractor) — Operational qualification
└─ Comprehensive performance evaluation — Performance inspection by a third party — Performance qualification