Question 48 TK01 - Tank Vessel Assistant - Dangerous Liquids

The Correct Answer is D. **Why Option D ("The vessel's cargo tanks") is correct:** The purpose of taking final samples (completion samples) is to confirm the quality of the product that has actually been delivered and accepted by the vessel. The vessel's cargo tanks represent the final destination and storage location for the loaded product, and the samples taken from these tanks are the definitive proof of the quality and quantity (when used with ullages/soundings) of the oil received by the ship. These samples are crucial for establishing accountability regarding cargo quality during the voyage and upon discharge at the receiving port. **Why the other options are incorrect:** * **A) The shoreline low points:** This refers to specific points in the pipeline infrastructure, usually designed for drainage or pigging, but they do not represent the bulk cargo that has officially entered the ship's tanks. Sampling here would be non-standard and irrelevant to the final delivery quality. * **B) The shore tank discharge:** While the product quality is controlled here before pumping, taking the final sample at this location does not account for potential contamination or mixing that could occur during the transit through the loading line, the dock riser, or the vessel's manifold. The quality must be verified after it has entered the receiving facility (the ship). * **C) The dock riser:** The dock riser is the vertical pipe connecting the shore pipeline to the manifold at the loading arm/hose connection. Sampling here (often done as running or continuous drip samples during loading) provides a good indication of the quality entering the ship's manifold, but it is still outside the vessel's custody. The definitive final sample must be taken from inside the vessel's storage tanks once loading is complete.