What must be documented when cleaning oil tanks aboard a ship?

Documenting entries in the Oil Record Book (ORB) part 2 is essential when cleaning oil tanks aboard a ship because this record serves as a formal account of all oil-related operations conducted on the vessel. The ORB is a legal document that demonstrates compliance with MARPOL regulations, which are designed to protect the marine environment from pollution by oil. Accurate entries in the ORB part 2 ensure transparency and accountability regarding the handling of oil waste and handling procedures, which are crucial for environmental protection and compliance with international maritime law.

Understanding the significance of documentation in this context highlights the importance of proper record-keeping in maritime operations, particularly those involving hazardous materials like oil. This documentation not only aids in inspections and audits but also helps in tracing any incidents of pollution back to initial operations, thereby reinforcing the ship's commitment to maintaining environmental standards.