Tanker Systems and Equipment Flashcards
7 cards from real Tanker Familiarization practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Tanker Systems and Equipment flashcards as text
What is the purpose of a crude oil washing (COW) system on a tanker?
Answer: To use cargo crude oil as a solvent to clean tank residues during discharge
COW systems spray crude oil at high pressure inside tanks during discharge, dissolving wax and sediment to maximize cargo recovery and reduce manual cleaning.
A tanker's slop tank is used primarily to:
Answer: Collect tank washing water and oily residues
The slop tank collects dirty wash water and oily residues from cargo tank cleaning, allowing oil and water to separate before controlled disposal.
Which component of the cargo pump system prevents reverse flow when the pump stops?
Answer: Non-return (check) valve
A non-return (check) valve automatically closes to prevent backflow of cargo when the pump loses pressure or shuts down.
What does the term 'ullage' refer to in cargo measurement?
Answer: The distance from the liquid surface to the top of the tank
Ullage is the empty space above the liquid in a tank, measured from the reference point at the top; cargo volume is calculated from ullage tables.
On a tanker, what is the function of a 'vapor recovery system'?
Answer: To capture cargo vapors during loading for safe disposal or return to shore
Vapor recovery systems collect hydrocarbon vapors displaced from tanks during loading and return them to shore facilities, reducing emissions and explosion risk.
What is the main hazard of a 'sloshing' cargo in a partially filled tank during rough weather?
Answer: Dynamic loads that can damage tank structure and affect vessel stability
Sloshing generates large dynamic pressure loads on tank bulkheads and can severely compromise structural integrity and vessel stability.
Which type of pump is most commonly used for stripping (removing the last traces of cargo from a tank)?
Answer: Jet pump (eductor)
Eductors (jet pumps) use a high-pressure motive fluid to create suction and are ideal for stripping because they can handle very small volumes and air without damage.