Tankerman · Chemical — Prewash
After discharging a high-category (e.g., Category X) Annex II cargo, the tank generally requires:
- ANo cleaning at all
- BImmediate discharge of all residue to the sea
- CA mandatory prewash, with the residues discharged to a reception facility, recorded in the Cargo Record Book✓ Correct
- DFilling with the next cargo without cleaning
Explanation
Higher-category NLS cargoes require a prewash on unloading, with the resulting residue/water mixture sent to a shore reception facility rather than the sea. Operations are logged in the Cargo Record Book and overseen per the ship's P&A (Procedures and Arrangements) Manual.
Authority: MARPOL Annex II; IBC Code
Practice the full Tankerman bank
Free spaced-repetition quizzing across 2550 USCG exam questions — it schedules your reviews so the ones you miss come back until they stick.
Related Tankerman questions
- Transfer — PIC
During a cargo transfer on a tank vessel, the Person-In-Charge (PIC) is primarily responsible for:
- Transfer — DOI
Before a transfer of oil or hazardous material begins, the PICs of the transferring and receiving facilities must complete and agree on a:
- Safety — Inert Gas
The purpose of an inert gas system on a tanker is to:
- Safety — Inert Gas
A cargo tank is generally considered properly inerted when the oxygen content is held at or below:
- Safety — Flammability
A hydrocarbon vapor/air mixture will burn only when its concentration is:
- Safety — Static
To prevent a static-electricity ignition hazard during loading of a static-accumulating cargo, the tankerman should: