LNG Ships: Technical Overview
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Questions and Answers

What is Boil Off Gas primarily used for in LNG carriers?

  • Cooling systems
  • Fuel for propulsion (correct)
  • Cargo storage
  • Maintenance

    • Low-pressure 2 stroke Dual Fuel engines are currently the least favored type for LNG propulsion.

    False

    Name one of the two major manufacturers that dominate the LNG engine market.

    MAN Energy Solutions or WinGD

    Most LNG carriers use their cargo as fuel, which is called _____ Gas.

    <p>Boil Off</p> Signup and view all the answers

    Match the LNG propulsion engine manufacturers with their respective engine models:

    <p>MAN Energy Solutions = ME-GI/ME-GA WinGD = X-DF</p> Signup and view all the answers

    What is a key characteristic of Type C tanks?

    <p>They meet pressure vessel standards and are self-supported.</p> Signup and view all the answers

    C-type tanks are commonly used across LNG and Pressurized LPG vessels.

    <p>True</p> Signup and view all the answers

    What material is generally used for the construction of Type C tank bodies?

    <p>Low-temperature resistant materials</p> Signup and view all the answers

    The first domestic LNG carrier using C-type independent liquid cargo tank was delivered by __________ in 2015.

    <p>Jiangnan Shipyard</p> Signup and view all the answers

    Match the following characteristics with Type C tanks:

    <p>Pressure-resistant = Meets pressure vessel standard Design = Cylindrical or spherical with no internal structure Common use = Small and medium-sized LNG carriers Insulation = Covered with insulating materials</p> Signup and view all the answers

    Which type of containment is adapted from LPG containment for LNG?

    <p>Type A</p> Signup and view all the answers

    What is a primary advantage of membrane tanks in LNG carriers?

    <p>High capacity utilization</p> Signup and view all the answers

    Moss spherical tanks have better volume utilization than membrane tanks.

    <p>False</p> Signup and view all the answers

    Membrane tanks provide efficient space usage compared to spherical tanks.

    <p>True</p> Signup and view all the answers

    What material is predominantly used in the construction of Type A tanks?

    <p>aluminum</p> Signup and view all the answers

    What is the primary construction material of Type B LNG tanks?

    <p>Aluminium alloy</p> Signup and view all the answers

    What unique design feature does the TGZ MARK III include to manage thermal contraction?

    <p>waffle pattern</p> Signup and view all the answers

    Type A tanks utilize ______ materials in the insulation.

    <p>low-density foam</p> Signup and view all the answers

    What is a benefit of Type A tanks in terms of liquid motion?

    <p>They have no sloshing issues.</p> Signup and view all the answers

    The __________ feature of membrane tanks helps in continuous monitoring for leaks.

    <p>double membrane</p> Signup and view all the answers

    Type A tanks currently have no competitors in the LNG carrier market.

    <p>False</p> Signup and view all the answers

    Match the advantages of membrane tanks with their descriptions:

    <p>High Capacity Utilization = Maximizes cargo space Lightweight = Reduces vessel weight Leak Detection = Uses double membrane system Efficient Space Usage = Adapts to ship structure</p> Signup and view all the answers

    Match the following types of LNG tank classifications with their descriptions:

    <p>Type A = Independent self-supporting prismatic containment system Moss = Spherical design allowing for flexibility Membrane = Thin-walled containment system Type B = Pressure vessels designed for safety</p> Signup and view all the answers

    What is the primary safety feature of spherical Type B LNG tanks?

    <p>High degree of safety against fracture or failure</p> Signup and view all the answers

    Type A tanks have similar flexibility to Moss spherical tanks.

    <p>True</p> Signup and view all the answers

    Which of the following is noted as a consideration for operating an LNG carrier with a membrane tank?

    <p>Thermal Contraction Management</p> Signup and view all the answers

    The main purpose of the void spaces between the inner hull and outer hull in LNG carriers is for ______.

    <p>ballast</p> Signup and view all the answers

    Regular maintenance and inspection are unnecessary for membrane tanks.

    <p>False</p> Signup and view all the answers

    Which type of LNG tank is described as 'largely out of date and uncommon'?

    <p>IHI Prismatic</p> Signup and view all the answers

    What is the primary factor affecting the insulation efficiency of Type A tanks?

    <p>thermal conductivity</p> Signup and view all the answers

    What type of monitoring system is included in designs like GT96 to detect hydrocarbon leaks?

    <p>nitrogen flushing system</p> Signup and view all the answers

    Insulation in Type B tanks is necessary to minimize boil-off.

    <p>True</p> Signup and view all the answers

    Match the LNG tank types with their features:

    <p>Type A = Only 1 carrier currently exists Type B = Spherical tanks made of aluminium alloy Membrane = Containment of choice for efficiency and capacity IHI Prismatic = Largely out of date</p> Signup and view all the answers

    What structural feature supports the weight of Type B LNG tanks?

    <p>Metal skirt</p> Signup and view all the answers

    What is the DWT of the LNG Rosenrot?

    <p>98,936 DWT</p> Signup and view all the answers

    The LNG Rosenrot was built in 2020.

    <p>False</p> Signup and view all the answers

    The LNG Rosenrot has a beam of ______ meters.

    <p>47.9</p> Signup and view all the answers

    What does 'heel' refer to in LNG tanker operations?

    <p>The small quantity of cargo remaining in the tanks</p> Signup and view all the answers

    LNG carriers primarily operate on laden or ballast voyages.

    <p>True</p> Signup and view all the answers

    The LNG Rosenrot is classified as a ______ carrier.

    <p>LNG</p> Signup and view all the answers

    Match the following specifications with their correct descriptions:

    <p>LOA = Length Overall of the ship Beam = Width of the ship DWT = Deadweight tonnage BHP = Brake Horse Power of the engines</p> Signup and view all the answers

    Study Notes

    LNG Ships: Technical and Operational Intro

    • LNG ship operation involves laden or ballast voyages
    • Cargo tanks remain conditioned for cargo throughout this time
    • Heel (ballast): small quantity of cargo left in tanks for cooling and continued use as fuel
    • Some cargo tanks are also used as fuel tanks
    • LNG vessels need a dry dock process to transition between cargo cycles

    LNG Vessel Classification

    • LNG vessels can be classified based on containment type
    • Vessels can have Independent tanks, or Integral tanks
      • Independent tanks (Type A or B): Classified based on pressure (p<700 mbar, p>2000 mbar) and secondary barrier type (Full or Partial).
        • Type A: Independent, self-supporting, prismatic, aluminum tanks
        • Type B: Independent, spherical, or cylindrical tanks
      • Integral tanks (Type C): Commonly used, cheaper option, cylindrical or spherical

    LNG Containment Types: A, B, and C

    • Type A: Independent, self-supporting, prismatic containment with low-density foam for insulation.
    • Type B: Moss-Rosenberg type, independent, spherical, tanks.
    • Type C: Independent, cylindrical or spherical tanks using low-temp materials, insulated
    • LNG carriers use various containment systems for shipping and storing LNG
    • Membrane (integrated) tanks are also a popular choice

    LNG Propulsion

    • LNG carriers often reuse their cargo as fuel in a process called BOIL OFF GAS (BOG)
    • Low-pressure, two-stroke dual-fuel engines are common in modern LNG carriers.
    • Makers in this space include MAN Energy Solutions and WinGD

    Operation Considerations

    • Thermal contraction management is crucial during cryogenic temperatures
    • Leak detection systems are in use to monitor for leaks
    • Maintenance and inspection are essential, any damage could compromise the containment system

    Additional Notes

    • The presentation highlights various types of LNG carriers and the associated technology.
    • Key factors such as tank containment systems, propulsion types, operation and maintenance are presented.

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    Related Documents

    LNG Shipping Introduction PDF

    Description

    Explore the technical and operational aspects of LNG ships, including their classification and containment types. Understand the significance of ballast voyages and the role of cargo tanks in LNG vessel operations. This quiz provides essential insights into the field of maritime engineering.

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