What is the working of a nitrogen generator?

flowchart LR
    A[Compressed Air] --> B[Feed Air Treatment]
    B --> C[Membrane or Adsorber Modules]
    C --> D[High Purity Nitrogen]
    C --> E[Off-spec Gas]
    E --> F[Automatic Discharge to Atmosphere]

• Definition: System that produces inert gas by separating air into its component gases using compressed air passed through hollow fibres, semi-permeable membranes or adsorber materials
• Purity: High purity nitrogen per FSS Code Chapter 15, as amended by MSC.367(93)
• Safety: Automatic discharge of off-spec gas during start-up and abnormal operation; oxygen-enriched air and nitrogen-product enriched gas discharged to safe location on open deck
• Ventilation: If in separate compartment, independent mechanical extraction ventilation (6 air changes/hour) and low oxygen alarm required
• Instrument: SOLAS regulation II-2/4.5.5.1, FSS Code Chapter 15 (MSC.367(93)), IGF Code Chapter 6 §6.14.3, IACS UR F20 §F20.3.1–3.4, §F20.3.7
• Trap: Must automatically discharge off-spec gas; oxygen-enriched air must not be vented into machinery spaces