DL Dangerous Liquids Examination

Coast Guard Tankerman–Person in Charge (DL – Dangerous Liquids) Examination Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the primary responsibility of a Tankerman–PIC when

transferring dangerous liquids?

• Maintaining paperwork for the vessel
• Ensuring proper operation of the vessel’s engines
• Ensuring the safe transfer of cargo
• Supervising deck maintenance

Rationale: The Tankerman–PIC is responsible for the overall safety of

cargo transfer operations, including preventing spills, overfills, and accidents.

• Which document must always accompany a transfer of dangerous

liquids? 1 / 4

• Crew roster
• Manifest or bill of lading
• Logbook entry
• Mooring plan

Rationale: The manifest or bill of lading details the type and quantity

of cargo being transferred, which is essential for safety and regulatory compliance.

• When should a pre-transfer conference be conducted?
• Only for crude oil transfers
• After beginning the transfer
• Before any transfer of dangerous liquids begins
• Only if the transfer is at night

Rationale: A pre-transfer conference ensures all personnel

understand the transfer procedure, hazards, and emergency protocols.

• Which device is used to measure the ullage of a tank?
• Thermometer
• Tape gauge or sounding tape
• Flow meter
• Pressure gauge

Rationale: A tape gauge or sounding tape is used to measure the

liquid level in tanks to prevent overfilling and ensure accurate cargo measurement. 2 / 4

• What is the minimum fire extinguisher requirement on a tank barge

carrying flammable liquids?

• One water extinguisher
• One foam extinguisher per deck
• Extinguishers appropriate for Class B fires within reach
• One dry chemical extinguisher per crew member

Rationale: Flammable liquids are Class B hazards; extinguishers must

be readily available and suitable for flammable liquid fires.

• Which of the following is considered a Class B flammable liquid?
• Water
• Diesel fuel
• Gasoline
• Sand

Rationale: Gasoline is highly flammable and classified as a Class B

liquid, requiring specific handling and firefighting precautions.

• The PIC is responsible for monitoring which of the following during a

cargo transfer?

• Engine temperature
• Tank levels, pressure, and valve positions
• Weather forecasts only
• Crew meal times

Rationale: Continuous monitoring of tank levels, pressures, and

valves prevents overfills, leaks, and accidents. 3 / 4

• When using hoses for cargo transfer, what is a key safety

consideration?

• Color of the hose
• Proper grounding and bonding
• Length of the hose only
• Hose storage location after transfer

Rationale: Grounding and bonding hoses prevent static electricity

buildup, which could ignite flammable vapors.

• Which type of personal protective equipment (PPE) is mandatory

when handling flammable liquids?

• Cotton overalls only
• Flame-resistant clothing, gloves, and eye protection
• Steel-toed shoes only
• Hard hat only

Rationale: Flame-resistant PPE protects personnel from fire hazards

during transfer and handling of flammable liquids.

10. Overfilling a tank can result in:

• Increased cargo value
• Faster transfer
• Spills, environmental damage, and fines
• Better tank stability

Rationale: Overfilling poses serious environmental, safety, and

regulatory risks, including fines and pollution.

• / 4