🔍 Key Concepts

• Properties and hazards of adiponitrile as a cargo (toxicity, flammability, vapor concerns) • Differences between open, closed, and vapor-recovery venting systems on tank barges • Relevant 46 CFR tank barge cargo venting requirements for toxic/poisonous or noxious liquid cargoes

💭 Think About

• Is adiponitrile treated more like a simple petroleum product, or like a toxic/noxious chemical that requires extra vapor control? • Which venting option best minimizes vapor release to the atmosphere while still protecting the tank from over/under pressure? • For a dangerous chemical cargo, would unrestricted open venting normally be acceptable, or would regulations tend to require containment/control of vapors?

✅ Before You Answer

• Verify whether adiponitrile is classified as toxic/poison inhalation hazard or similar under cargo regulations • Check which venting systems are typically required for dangerous liquid chemicals on tank barges (compare simple flame-screen vents vs. vapor recovery/closed systems vs. P/V valves) • Confirm that the chosen option matches both safety of personnel/environment and control of tank pressure requirements