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VLEC Managment / Day 5 Revision - Discharge, Warm-Up, and Emergency Procedures
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{ "quizId": "day5_discharge_warmup_emergency_revision", "courseId": "VLEC Managment", "title": "Day 5 Revision - Discharge, Warm-Up, and Emergency Procedures", "subtitle": "BSM Maritime Training Centre", "passPercent": 70, "version": "1.0", "date": "2026-03-17", "questions": [ { "id": 1, "topic": "Unloading Principles", "question": "What are the two main principles for unloading cargo tanks listed on Day 5?", "options": [ "Unloading with nitrogen purge and unloading with dry air", "Unloading with vapour return and unloading without vapour return", "Unloading by gravity and unloading by stripping only", "Unloading with seawater heating and unloading with glycol cooling" ], "answer": "Unloading with vapour return and unloading without vapour return", "explanation": "The Day 5 unloading principles slide identifies discharge with vapour return and discharge without vapour return as the two main methods." }, { "id": 2, "topic": "Unloading Principles", "question": "When unloading from a closed tank, what generally happens to tank pressure?", "options": [ "It always rises sharply", "It generally decreases", "It remains exactly constant", "It drops below atmospheric immediately" ], "answer": "It generally decreases", "explanation": "The unloading principles slide notes that tank pressure generally decreases when unloading from a closed tank." }, { "id": 3, "topic": "Cargo Pumps", "question": "What type of cargo pump is described in the Day 5 cargo pump overview?", "options": [ "Three-stage screw pump", "Single-stage electric-driven deepwell centrifugal pump", "Steam-driven reciprocating pump", "Hydraulic gear pump" ], "answer": "Single-stage electric-driven deepwell centrifugal pump", "explanation": "The Day 5 pump overview describes cargo pumps as single-stage, electric-driven, fixed-speed, centrifugal deepwell pumps." }, { "id": 4, "topic": "Cargo Pumps", "question": "What rated capacity is given for the Day 5 cargo pumps?", "options": [ "200 m3/h", "350 m3/h", "500 m3/h", "650 m3/h" ], "answer": "350 m3/h", "explanation": "The cargo pump overview slide gives a rated pump capacity of 350 m3/h." }, { "id": 5, "topic": "Pump Start Procedure", "question": "At the beginning of the cargo pump operation procedure, how much should the discharge valve be opened?", "options": [ "Fully open", "About 10% open", "50% open", "Remain fully shut until tank empty" ], "answer": "About 10% open", "explanation": "The procedure specifies the discharge valve should initially be approximately 10% open." }, { "id": 6, "topic": "Pump Start Procedure", "question": "What should be done with the tank filling valve before starting the cargo pump?", "options": [ "Set it to 25% open", "Keep it shut", "Open it 100%", "Open and shut it repeatedly" ], "answer": "Open it 100%", "explanation": "The pump procedure requires the tank filling valve to be fully open before starting the pump." }, { "id": 7, "topic": "Booster Pumps", "question": "Where are the booster pumps located?", "options": [ "Inside the ballast tanks", "On deck close to the heater and vaporizer", "Inside the compressor room bilge", "At the manifold drain chest" ], "answer": "On deck close to the heater and vaporizer", "explanation": "The booster pump overview states that two cargo booster pumps are located on deck close to the heater and vaporizer." }, { "id": 8, "topic": "Unloading Without Vapour Return", "question": "What is the best practice for tank pressure during unloading without vapour return?", "options": [ "Keep tank pressure as low as possible", "Keep high cargo tank pressure to avoid pressure problems", "Maintain vacuum in the tank", "Vent continuously to atmosphere" ], "answer": "Keep high cargo tank pressure to avoid pressure problems", "explanation": "The slide advises maintaining high cargo tank pressure during unloading without vapour return to avoid pressure-related issues." }, { "id": 9, "topic": "Pressure Make-Up", "question": "Which method is listed to provide pressure make-up and avoid vacuum during unloading without vapour return?", "options": [ "Use ballast air fans", "Supply vapour by evaporating cargo liquid in the cargo vaporizer", "Introduce seawater into the tank", "Inject fresh water spray" ], "answer": "Supply vapour by evaporating cargo liquid in the cargo vaporizer", "explanation": "One listed pressure make-up method is supplying vapour by evaporating cargo liquid in the cargo vaporizer." }, { "id": 10, "topic": "Discharge Monitoring", "question": "Which parameter should be monitored continuously during discharging operations?", "options": [ "Gyro error and course recorder", "Mechanical seal oil level", "Fresh water generator salinity", "Boiler feed temperature only" ], "answer": "Mechanical seal oil level", "explanation": "Critical discharge monitoring points include tank pressure and level, discharge pressure, mechanical seal oil level, and motor ammeters." }, { "id": 11, "topic": "Emergency Response", "question": "If leakage, hose fracture, or tank pressure alarm occurs during discharge, what is the immediate response?", "options": [ "Increase pump speed", "Activate ESD system", "Shut all accommodation doors only", "Start inerting all tanks" ], "answer": "Activate ESD system", "explanation": "The emergency response section instructs operators to activate the ESD system if leakage, hose fracture, or tank pressure alarm occurs." }, { "id": 12, "topic": "NPSH Management", "question": "When liquid height falls below 2 meters, what should be done to avoid cavitation?", "options": [ "Increase pump discharge valve opening fully", "Successively throttle the pump discharge valve", "Close all vapor lines", "Start both booster pumps" ], "answer": "Successively throttle the pump discharge valve", "explanation": "The tank emptying procedure says to throttle the discharge valve progressively when liquid level is below 2 meters to avoid cavitation." }, { "id": 13, "topic": "NPSH Management", "question": "What is a sign of cavitation in the cargo pump system?", "options": [ "Stable discharge pressure and current", "Unstable discharge pressure and ammeter readings", "Lower tank temperature only", "Improved sealing oil condition" ], "answer": "Unstable discharge pressure and ammeter readings", "explanation": "The presentation identifies unstable discharge pressure and ammeter readings as signs of cavitation." }, { "id": 14, "topic": "Tank Emptying", "question": "What approximate liquid remainder is left per tank half when the pump stops?", "options": [ "17 liters", "85 liters", "171 liters", "500 liters" ], "answer": "171 liters", "explanation": "The final stage slide states an approximate liquid remainder of 171 liters per tank half when the pump stops." }, { "id": 15, "topic": "Warm-Up Reasons", "question": "Why may tank warming be required before loading a new cargo?", "options": [ "Because colder cargo must always follow warmer cargo", "To prevent vapour condensation when a warmer cargo follows a colder cargo", "To increase sloshing in membrane tanks", "To cool the vent mast before sailing" ], "answer": "To prevent vapour condensation when a warmer cargo follows a colder cargo", "explanation": "Warming is needed when a warmer cargo will be loaded after a colder one to prevent vapour condensation in the cold tank." }, { "id": 16, "topic": "Cargo Residue", "question": "Why must residual liquid be removed before changing grades or preparing for tank entry?", "options": [ "To increase cargo density", "Because nearby temperature stays at the liquid boiling point while residual liquid remains", "To improve seawater cooling", "To reduce manifold pressure drop only" ], "answer": "Because nearby temperature stays at the liquid boiling point while residual liquid remains", "explanation": "Residual liquid continues to vaporize and keeps the surrounding temperature at the liquid's boiling point, so it must be removed." }, { "id": 17, "topic": "Residue Removal", "question": "Before tank liquid level falls below 1 meter during stripping, what is recommended?", "options": [ "Stop all pumps immediately", "Run both pumps to avoid starting them at very low levels", "Close all discharge valves fully", "Switch to vapour return mode" ], "answer": "Run both pumps to avoid starting them at very low levels", "explanation": "The presentation recommends both pumps be running before liquid falls below 1 meter to avoid starting at very low levels." }, { "id": 18, "topic": "Hot Gas Removal", "question": "During boil-off removal of residual liquid, what is the maximum permitted hot gas temperature?", "options": [ "+40C", "+60C", "+80C", "+120C" ], "answer": "+80C", "explanation": "The hot gas temperature control slide clearly states hot gas temperature shall not exceed +80C." }, { "id": 19, "topic": "Liquid-Free Confirmation", "question": "What is one indication that all liquid has been removed from a tank?", "options": [ "Tank pressure rises rapidly forever", "Tank pressure levels off and bottom temperature rises quickly", "Compressor amps fall to zero instantly", "IBS pressure always increases" ], "answer": "Tank pressure levels off and bottom temperature rises quickly", "explanation": "The slides state that tank pressure levels off and tank bottom temperature suddenly rises when all liquid has been removed." }, { "id": 20, "topic": "Warm-Up Completion", "question": "What target temperature is given for the secondary barrier during tank warm-up?", "options": [ "-20C", "0C", "+5C", "+25C" ], "answer": "+5C", "explanation": "The warm-up time estimates slide gives a target temperature of +5C on the secondary barrier." }, { "id": 21, "topic": "Membrane Failure", "question": "What hourly monitoring routine is recommended if vapour leakage to the IBS is suspected?", "options": [ "Record gas concentration and barrier temperature every hour for 8 hours", "Check manifold drains every 12 hours only", "Run one compressor at full load continuously without monitoring", "Close all nitrogen flow immediately" ], "answer": "Record gas concentration and barrier temperature every hour for 8 hours", "explanation": "The vapour leakage response protocol calls for hourly records over 8 hours without changing N2 flow initially." }, { "id": 22, "topic": "Liquid Leakage to IBS", "question": "How many warning signs are considered enough to require immediate action for liquid leakage to the IBS?", "options": [ "Any 1 sign", "Any 2 signs", "Any 4 signs", "Only all 5 signs together" ], "answer": "Any 2 signs", "explanation": "The Day 5 liquid leakage slide states that any 2 of the 5 warning signs require immediate action." }, { "id": 23, "topic": "IBS / IS Pressure", "question": "If liquid leakage to IBS is suspected, to what level should contaminated IBS pressure be kept?", "options": [ "5-10 mbar below the IBS relief valve set point", "Exactly 30 barg", "At atmospheric pressure only", "15 bar above tank pressure" ], "answer": "5-10 mbar below the IBS relief valve set point", "explanation": "The emergency response calls for venting the contaminated IBS and keeping pressure about 5-10 mbar below the 30 mbarg relief valve set point." }, { "id": 24, "topic": "Barrier Monitoring", "question": "What is an early warning sign of secondary barrier deterioration in IBS/IS monitoring?", "options": [ "Parallel K1 curves", "Diverging K1 curves", "Low seawater temperature", "Steady manifold pressure" ], "answer": "Diverging K1 curves", "explanation": "The monitoring slide states that diverging K1 curves are an early warning of secondary barrier deterioration." }, { "id": 25, "topic": "Punching Device", "question": "What is the maximum allowed value of ΔL = L(IBS) - L(Tank) when using the barrier punching device?", "options": [ "0.1 m", "0.5 m", "1.0 m", "2.0 m" ], "answer": "0.5 m", "explanation": "The presentation warns that ΔL must stay below 0.5 m at all times during pump-out using the messenger or punching device." }, { "id": 26, "topic": "Cold Spots", "question": "What should be done if an extensive or spreading cold spot develops in a cofferdam?", "options": [ "Ignore it if pressure is stable", "Activate cofferdam heating to maximum", "Vent the cargo tank immediately to atmosphere", "Shut down all N2 supply permanently" ], "answer": "Activate cofferdam heating to maximum", "explanation": "The insulation deterioration slide says extensive or spreading cold spots in a cofferdam require maximum cofferdam heating." }, { "id": 27, "topic": "Cargo Overfilling", "question": "At what alarm level does ESD activate in the cargo overfilling protection scheme?", "options": [ "LAH at 95%", "LAHH at 96.7% or 96.9%", "LAVH at 98.5% or 98.8%", "LAEH at 99.0%" ], "answer": "LAEH at 99.0%", "explanation": "The cargo overfilling slide states that LAEH at 99.0% activates ESD and stops all cargo operations." }, { "id": 28, "topic": "Gas Fire Response", "question": "What is identified as the most effective extinguishing agent for gas fires?", "options": [ "Seawater spray directly on the flame", "Dry powder", "Foam blanket only", "Fresh water mist inside the flame" ], "answer": "Dry powder", "explanation": "The emergency response slide clearly states that dry powder is the most effective extinguishing agent for gas fires." }, { "id": 29, "topic": "Jettisoning", "question": "When jettisoning cargo, what discharge capacity limit is specified?", "options": [ "Use all cargo pumps at maximum rate", "Limit discharge to one cargo pump capacity only", "Maintain any rate above 5000 m3/h", "Stop if wind speed exceeds 5 knots" ], "answer": "Limit discharge to one cargo pump capacity only", "explanation": "The jettisoning procedure specifies limiting discharge to one cargo pump capacity only." }, { "id": 30, "topic": "STS Transfer", "question": "What is the correct action if communication fails during an STS transfer?", "options": [ "Continue at minimum rate only", "Suspend all operations until communication is restored", "Open PERC immediately without warning", "Increase vapour pressure differential" ], "answer": "Suspend all operations until communication is restored", "explanation": "The STS transfer slide states that communication failure means all operations must be suspended until communications are restored." } ], "courseFolder": "VLEC Managment", "quizFolder": "Day 5 Revision" }
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