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VLEC Managment / Day 2 Revision - Inerting Pipelines and Gassing Up
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{ "quizId": "day2_inerting_gassing_up_revision", "courseId": "VLEC Managment", "title": "Day 2 Revision - Inerting Pipelines and Gassing Up", "subtitle": "BSM Maritime Training Centre", "passPercent": 70, "version": "1.0", "date": "2026-03-17", "questions": [ { "id": 1, "topic": "Objectives", "question": "One key objective of the Day 2 exercise is to determine when what has been achieved?", "options": [ "The reliquefaction plant has been cooled down", "The cargo tanks have been inerted", "The vaporizer has reached full capacity", "The manifold drains are gas free" ], "answer": "The cargo tanks have been inerted", "explanation": "The Day 2 objectives specifically include determining when cargo tanks have been inerted." }, { "id": 2, "topic": "Objectives", "question": "Besides inerting tanks, the exercise also requires inerting which systems?", "options": [ "Accommodation ventilation only", "Cargo pipelines and deck storage tanks", "Main engine air coolers", "Ballast lines only" ], "answer": "Cargo pipelines and deck storage tanks", "explanation": "The objectives state that all cargo pipelines and deck storage tanks are to be inerted." }, { "id": 3, "topic": "Objectives", "question": "Why is familiarization with the pipeline system emphasized during the exercise?", "options": [ "To estimate hull strength", "To understand how the pipeline systems connect to cargo tanks and equipment", "To identify paint defects on deck", "To calibrate the gyrocompass" ], "answer": "To understand how the pipeline systems connect to cargo tanks and equipment", "explanation": "The exercise aims to make personnel fully familiar with the pipeline systems and their connections." }, { "id": 4, "topic": "IG Reservoir", "question": "During use of tanks as an inert gas reservoir, how should cargo pump and emergency pump discharge valves be opened?", "options": [ "Fully open to maximize flow", "Left fully shut throughout", "Only cracked open to allow purging without rotating pumps", "Opened and closed repeatedly every minute" ], "answer": "Only cracked open to allow purging without rotating pumps", "explanation": "The note on the slide specifies that pump discharge valves should only be cracked open so purging can occur without turning the pumps." }, { "id": 5, "topic": "Cargo Pipelines", "question": "Which cargo lines must be purged after tank purging?", "options": [ "Only cargo liquid lines", "Only cargo vapor lines", "Both cargo liquid lines and cargo vapor lines", "Neither, because tanks are already inerted" ], "answer": "Both cargo liquid lines and cargo vapor lines", "explanation": "The procedure calls for purging all cargo liquid lines and all cargo vapor lines." }, { "id": 6, "topic": "Cargo Pipelines", "question": "What should be done with drain piping at the bottom of the liquid manifold?", "options": [ "Fill it with seawater", "Purge it", "Blank it permanently", "Close and ignore it" ], "answer": "Purge it", "explanation": "The drain piping at the bottom of the liquid manifold is specifically listed for purging." }, { "id": 7, "topic": "Cargo Pipelines", "question": "Why are blanked manifold areas and blind sections included in the purging plan?", "options": [ "They may trap pockets of air or gas", "They improve glycol circulation", "They increase vaporizer capacity", "They automatically self-purge" ], "answer": "They may trap pockets of air or gas", "explanation": "Blind sections and blanked-off areas can retain trapped pockets, so they must be purged as well." }, { "id": 8, "topic": "Cargo Pipelines", "question": "What is the required isolating valve position during purging of cargo pipelines?", "options": [ "All isolating valves closed", "All isolating valves open", "Alternating open and closed every hour", "Only vapor line isolating valves open" ], "answer": "All isolating valves open", "explanation": "The slide states that all isolating valves are to be kept in the open position during purging." }, { "id": 9, "topic": "Cargo Pumps", "question": "What is the reason for keeping cargo pump discharge valves only partly open during purging?", "options": [ "To increase pump speed", "To prevent the impeller from turning", "To force liquid back into the tank", "To cool the pump casing" ], "answer": "To prevent the impeller from turning", "explanation": "Partly opening the discharge valves allows purge flow while preventing the impeller from rotating." }, { "id": 10, "topic": "Compressors", "question": "Which compressor-related lines must be purged?", "options": [ "Only suction vapor lines", "Only hot gas lines", "Suction vapor lines, condensate lines, and hot gas lines", "Only drain lines below deck" ], "answer": "Suction vapor lines, condensate lines, and hot gas lines", "explanation": "The compressor systems section requires purging of suction vapor lines, condensate lines, and hot gas lines." }, { "id": 11, "topic": "Compressors", "question": "How can complete purging and inerting of compressor-related systems be verified?", "options": [ "By sounding all ballast tanks", "By utilizing all drain plugs", "By increasing tank pressure to maximum", "By stopping all ventilation fans" ], "answer": "By utilizing all drain plugs", "explanation": "The procedure states that all drain plugs should be used to verify complete purging and inerting." }, { "id": 12, "topic": "Level Gauging", "question": "Which fittings should be opened on the cargo side for level gauging systems?", "options": [ "Pump relief valves", "Level gauge top mounting plugs", "Compressor crankcase drains", "Nitrogen generator bypass valves" ], "answer": "Level gauge top mounting plugs", "explanation": "The slide instructs personnel to open plugs of level gauge top mountings on the cargo side." }, { "id": 13, "topic": "Sampling Systems", "question": "What is required for sample points throughout the cargo system?", "options": [ "They should all be purged", "They should remain sealed until loading", "They should be filled with glycol", "They should be isolated from the tanks" ], "answer": "They should all be purged", "explanation": "All sample points throughout the cargo system are specifically listed for purging." }, { "id": 14, "topic": "Sampling Systems", "question": "Why must stripping lines be purged?", "options": [ "For complete vapor removal", "To improve sea suction pressure", "To reduce manifold stress", "To calibrate pressure transmitters" ], "answer": "For complete vapor removal", "explanation": "The stripping lines are purged to ensure complete vapor removal." }, { "id": 15, "topic": "Spray Lines", "question": "Which top spray line system is included in the purging list?", "options": [ "Fire main top spray line", "Condensate top spray line system", "Fresh water wash line", "Accommodation sprinkler line" ], "answer": "Condensate top spray line system", "explanation": "The condensate top spray line system is specifically named for purging." }, { "id": 16, "topic": "Reliq Plant", "question": "During inerting of the reliquefaction plant, inert gas passes via the knockout drums to where first?", "options": [ "The manifold drains", "The suction side of all four compressors", "The glycol expansion tank", "The level gauge standpipes" ], "answer": "The suction side of all four compressors", "explanation": "The Day 2 procedure states that inert gas passes via the knockout drums to the suction side of all four compressors." }, { "id": 17, "topic": "Reliq Plant", "question": "After passing through the compressors, inert gas is led to which location?", "options": [ "Cargo liquid line", "Vent riser", "Glycol heater return", "Emergency generator room" ], "answer": "Vent riser", "explanation": "The inert gas path described is via knockout drums to compressor suction and then to the vent riser." }, { "id": 18, "topic": "Reliq Plant", "question": "Why is each compressor run in turn during this operation?", "options": [ "To warm up the glycol", "To ensure complete inerting of the whole units", "To increase cargo tank pressure quickly", "To cool the manifold valves" ], "answer": "To ensure complete inerting of the whole units", "explanation": "Each compressor is run in turn specifically to ensure complete inerting of the whole units." }, { "id": 19, "topic": "Tank Release", "question": "After the tanks have provided inert gas, how is the inert gas then released to gas free the pipelines?", "options": [ "By opening all condensate and spray valves on each tank", "By shutting all tank domes", "By filling the tanks with seawater", "By venting through the accommodation intake" ], "answer": "By opening all condensate and spray valves on each tank", "explanation": "The procedure says inert gas from the tanks is released by opening all condensate and spray valves on each tank." }, { "id": 20, "topic": "Booster Heater System", "question": "How is the booster/heater system purged?", "options": [ "By nitrogen through the vapor return", "By inert gas via the liquid system", "By compressed air through the manifold", "By steam through the condensate drains" ], "answer": "By inert gas via the liquid system", "explanation": "The booster/heater system is purged by inert gas via the liquid system." }, { "id": 21, "topic": "Monitoring", "question": "What instrument can be used to monitor the progress and completion of the purge?", "options": [ "Magnetic compass", "Portable meter", "Clinometer", "Echo sounder" ], "answer": "Portable meter", "explanation": "The exercise notes that the progress and completion of the purge can be monitored with a portable meter." }, { "id": 22, "topic": "Drains and Cocks", "question": "What is done with drain and sample cocks on tanks, lines, plants, and manifolds once purging is complete?", "options": [ "They are blanked and sealed permanently", "They are opened and blown clear of trapped air", "They are filled with glycol", "They are submerged in water" ], "answer": "They are opened and blown clear of trapped air", "explanation": "The final step described is opening drain and sample cocks and blowing them clear of trapped air." }, { "id": 23, "topic": "Vaporizer", "question": "Where is the LNG / Ethylene vaporizer located?", "options": [ "In the engine room bilge", "On the upper deck", "Inside the accommodation block", "At the top of the vent mast" ], "answer": "On the upper deck", "explanation": "The technical specification slide states that the LNG / Ethylene vaporizer is located on the upper deck." }, { "id": 24, "topic": "Vaporizer", "question": "What type of heat exchanger is the vaporizer?", "options": [ "Plate type", "Shell and coil", "Horizontal shell and tube", "Vertical fin fan cooler" ], "answer": "Horizontal shell and tube", "explanation": "The technical characteristics list the vaporizer type as a horizontal shell and tube heat exchanger." }, { "id": 25, "topic": "Vaporizer", "question": "In the vaporizer, cargo flows through which side of the heat exchanger?", "options": [ "Tube side", "Shell side", "Both sides alternately", "Neither side because it is indirect" ], "answer": "Shell side", "explanation": "The slide explains that cargo is routed through the shell side and vaporized by warm glycol in the tubes." }, { "id": 26, "topic": "Vaporizer", "question": "What is used as the direct heating medium in the vaporizer?", "options": [ "Steam", "Hot water", "Warm glycol", "Thermal oil" ], "answer": "Warm glycol", "explanation": "The heat exchanger uses glycol as the direct heating medium." }, { "id": 27, "topic": "Vaporizer", "question": "What is the stated cargo capacity of the vaporizer?", "options": [ "500 Nm3/h", "1000 Nm3/h", "1500 Nm3/h", "3000 Nm3/h" ], "answer": "1500 Nm3/h", "explanation": "The technical data gives the cargo capacity as 1500 Nm3/h for ethylene at the stated temperatures." }, { "id": 28, "topic": "Vaporizer", "question": "What glycol flow rate should be adjusted to during the vaporizer starting procedure?", "options": [ "27 m3/h", "50 m3/h", "77 m3/h", "120 m3/h" ], "answer": "77 m3/h", "explanation": "The starting procedure instructs personnel to adjust glycol flow until reaching 77 m3/h." }, { "id": 29, "topic": "Vaporizer Start-Up", "question": "During start-up, what should be done with cargo vapour valves until a stable level is achieved in the heater?", "options": [ "Open them fully", "Keep them closed", "Cycle them open and shut", "Use them to control glycol flow" ], "answer": "Keep them closed", "explanation": "The procedure states that cargo vapour valves should remain closed until a stable level is achieved." }, { "id": 30, "topic": "Vaporizer Shut-Down", "question": "When stopping the vaporizer, what should happen before glycol flow is stopped?", "options": [ "Open V5550/5650 wider", "Leave glycol circulating until cargo in the heater has evaporated", "Start all compressors", "Flood the shell side with nitrogen" ], "answer": "Leave glycol circulating until cargo in the heater has evaporated", "explanation": "The stopping procedure requires glycol circulation to continue until the heater is emptied of cargo and depressurized." } ], "courseFolder": "VLEC Managment", "quizFolder": "Day 2 Revision" }
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