Podcast
Questions and Answers
What is a primary characteristic of Type C tanks?
What is a primary characteristic of Type C tanks?
Type C tanks are more expensive than alternative containment designs.
Type C tanks are more expensive than alternative containment designs.
False (B)
What type of materials are Type C tanks made from?
What type of materials are Type C tanks made from?
Low-temperature resistant materials.
The first domestic 30,000m3 LNG carrier delivered by Jiangnan Shipyard in 2015 used a __________ independent liquid cargo tank.
The first domestic 30,000m3 LNG carrier delivered by Jiangnan Shipyard in 2015 used a __________ independent liquid cargo tank.
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Match the following features with Type C tanks:
Match the following features with Type C tanks:
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What is commonly used as fuel by nearly all LNG carriers?
What is commonly used as fuel by nearly all LNG carriers?
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Low-pressure 2 stroke Dual Fuel engines are not favored for LNG carriers.
Low-pressure 2 stroke Dual Fuel engines are not favored for LNG carriers.
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Name one major manufacturer of LNG propulsion systems.
Name one major manufacturer of LNG propulsion systems.
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Low-pressure 2-stroke Dual Fuel engines are in favor for both LNG carriers and __________ vessels.
Low-pressure 2-stroke Dual Fuel engines are in favor for both LNG carriers and __________ vessels.
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Match the LNG propulsion manufacturers with their corresponding products:
Match the LNG propulsion manufacturers with their corresponding products:
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What is one benefit of Type A tanks?
What is one benefit of Type A tanks?
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Type A tanks are classified as self-supporting prismatic containment systems.
Type A tanks are classified as self-supporting prismatic containment systems.
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What material are Type A tanks primarily made of?
What material are Type A tanks primarily made of?
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Type A tanks are adapted for ______.
Type A tanks are adapted for ______.
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Match the LNG tank types with their characteristics:
Match the LNG tank types with their characteristics:
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What is the primary purpose of LNG carriers?
What is the primary purpose of LNG carriers?
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Type A tanks do not have liquid motion (sloshing) issues.
Type A tanks do not have liquid motion (sloshing) issues.
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What is one advantage of using low-density foam materials in insulation for Type A tanks?
What is one advantage of using low-density foam materials in insulation for Type A tanks?
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What is a significant advantage of membrane tanks in LNG carriers?
What is a significant advantage of membrane tanks in LNG carriers?
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Membrane tanks do not require regular maintenance and inspection.
Membrane tanks do not require regular maintenance and inspection.
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What design feature does the TGZ MARK III use to manage thermal contractions?
What design feature does the TGZ MARK III use to manage thermal contractions?
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Membrane tanks provide _____ space usage compared to spherical tanks.
Membrane tanks provide _____ space usage compared to spherical tanks.
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Match the following membrane tank characteristics to their advantages:
Match the following membrane tank characteristics to their advantages:
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Which of the following is crucial for membrane tank operation?
Which of the following is crucial for membrane tank operation?
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The GT96 membrane design includes a single membrane layer for leak detection.
The GT96 membrane design includes a single membrane layer for leak detection.
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What is the purpose of continuous monitoring in membrane tank systems?
What is the purpose of continuous monitoring in membrane tank systems?
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What is the primary material used in the GTT NO96 membrane?
What is the primary material used in the GTT NO96 membrane?
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The GTT Mark-III membrane is made of a single layer of material.
The GTT Mark-III membrane is made of a single layer of material.
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What is the purpose of the insulating material in the GTT membrane-type LNG carriers?
What is the purpose of the insulating material in the GTT membrane-type LNG carriers?
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GTT membrane-type LNG carriers are designed to have a loading restriction where the liquid level must be lower than _____% or higher than _____%.
GTT membrane-type LNG carriers are designed to have a loading restriction where the liquid level must be lower than _____% or higher than _____%.
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Which of the following is a benefit of the GTT membrane-type LNG carrier design?
Which of the following is a benefit of the GTT membrane-type LNG carrier design?
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Match the following membrane materials with their respective GTT systems:
Match the following membrane materials with their respective GTT systems:
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The Invar alloy has a high thermal expansion coefficient.
The Invar alloy has a high thermal expansion coefficient.
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What is the purpose of grooved ribs in the GTT Mark-III system?
What is the purpose of grooved ribs in the GTT Mark-III system?
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What is the deadweight tonnage (DWT) of the LNG Rosenrot?
What is the deadweight tonnage (DWT) of the LNG Rosenrot?
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The LNG Rosenrot was built in 2020.
The LNG Rosenrot was built in 2020.
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What type of propulsion does the LNG Rosenrot employ?
What type of propulsion does the LNG Rosenrot employ?
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The LNG Rosenrot has a cargo capacity when full of approximately ______ CBM.
The LNG Rosenrot has a cargo capacity when full of approximately ______ CBM.
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Which of the following surveys is scheduled for the LNG Rosenrot?
Which of the following surveys is scheduled for the LNG Rosenrot?
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Match the following attributes of the LNG Rosenrot with their correct details:
Match the following attributes of the LNG Rosenrot with their correct details:
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The 'heel' refers to the complete absence of cargo in the tanks during a ballast voyage.
The 'heel' refers to the complete absence of cargo in the tanks during a ballast voyage.
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The LNG Rosenrot has a length overall (LOA) of ______ meters.
The LNG Rosenrot has a length overall (LOA) of ______ meters.
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Study Notes
LNG Ships: Technical and Operational Intro
- Reports and presentations are based on market knowledge; estimates are not guaranteed and could be different due to circumstances or general uncertainty.
- MB Shipbrokers is not responsible for damages or losses from using the report.
- All rights reserved; unauthorized reproduction or quoting is prohibited.
LNG Vessels - Intro Video
- Image of an LNG vessel.
LNG Vessels - Containment Types
- Carriers are classified by containment type (independent tanks, integral tanks, moss and membrane vessels).
- Independent tanks (Type A, Type B, Type C) are differentiated by pressure (p < 700 mbar or p > 2000 mbar) and secondary barrier (full, partial, or none).
LNG Containment Types - Type A
- Type A tanks are a LPG containment adapted for LNG.
- They are self-supporting prismatic systems made of aluminum, offering flexibility and good volume utilization.
- They do not have liquid motion (sloshing) issues.
- Employ self-supporting IMO independent tank type A
- Material is typically stainless steel or 9% nickel steel.
- Secondary barriers use liquid-tight thermal insulation (polyurethane foam panels).
- An accessible space exists between the tank and insulation.
- Conventional cargo tank support is used.
- Currently, only one LNG carrier uses a Type A tank.
LNG Containment Types - Type B (Moss)
- Moss types are the most common Type B, but not the only.
- Constructed from aluminum alloy, designed for cryogenic temperatures and pressure close to atmospheric.
- Tanks are located within void spaces in the hull.
- These spaces provide ballast and protection in emergencies.
- No secondary barrier, but highly insulated with polystyrene foam (220 mm).
- Supported by a metal skirt from the equatorial ring.
- Has horizontal rings and vertical corrugated stiffeners for support.
- One other type of Type B tank design is IHI Prismatic, which is largely outdated.
LNG Containment Types - Membrane & C Types
- These are common due to efficiency and capacity.
- Membrane designs use thin, flexible membranes (stainless steel or Invar) supported by insulation layers, designed for direct LNG containment.
- GTT No96 is a system with main and secondary panels welded using Invar alloy.
- Invar alloy has low thermal expansion and conductivity.
- GTT Mark-III uses a thin stainless steel membrane with grooved ribs and a three-in-one composite insulation material bonded with layers of glass fiber cloth and aluminum foil.
- Insulation uses perlite or glass wool.
- Loading restriction: Liquid level must be between 10% and 70% to avoid sloshing impact and ensure stability.
Membrane Tank Designs: Characteristics and Advantages
- High capacity utilization - tanks can fit hull maximizing cargo.
- Efficient space usage - conforming to ship structure minimizes space waste.
- Lightweight - thin membranes and insulation result in a lighter structure potentially increasing fuel efficiency.
LNG Containment Types - Type C
- Type C tanks are generic, much cheaper, pressure-resistant, and self-supporting. Constructed of low-temperature resistant materials
- Cylindrical or spherical tanks with uniform shape and no internal structure, covered by insulation materials.
- Compared to other systems, installation is easier making it more common in smaller-medium sizes.
- Large C-type LNG carrier delivered in 2015 uses the German TGE containment system.
LNG Propulsion Types
- Propulsion system on LNG carriers uses boil-off gas efficiently.
- Low-pressure two-stroke dual fuel engines are used.
- Current manufacturers such as MAN Energy Solutions and WinGD are the primary producers in the industry.
How to Use Information (as a Broker)
- Research and verify information from the Form B, in case of gaps in information on LNG carriers this should be used as a guideline.
LNG Shipping-Cargo Operations
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LNG carrier's tank operations cycle - carrying cargo, and remaining in either laden or ballast voyage status.
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Tanks usually remain conditioned for cargo throughout most of vessel's operational cycle.
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Cargo may be loaded and unloaded via conventional stripping/spray filling pipes.
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Dry docking: The tanks undergo a process for maintenance, usually involving inerting, drying, and aeration. The tanks are then cooled for the next loading.
Intro to Gas up/Cool Down
- Process of gassing up and inerting LNG tanks after dry docking to prepare for next shipment.
Take Away Questions
- Key questions surrounding LNG propulsion systems.
- Key questions regarding containment systems, maintenance, cargo cycle and other characteristics.
Contact Information
- Contact details for MB Shipbrokers.
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Description
Test your knowledge on the characteristics, materials, and manufacturers related to LNG carrier tanks, particularly focusing on Type A and Type C tanks. This quiz will help you understand critical aspects of LNG containment systems and their propulsion technologies. Challenge yourself and learn more about LNG carriers and their components!
