What are the different types of tanks in LNG ship?

"What are the different types of tanks in LNG ship?".

Liquefied natural gas (LNG) ships play a vital role in the transport of natural gas across the globe. These ships are specifically designed to carry LNG, which is natural gas that has been cooled to extremely low temperatures to transform it into a liquid form for more efficient and economic transportation.

One of the crucial components of an LNG ship is its storage tanks. These tanks are responsible for holding the liquefied natural gas while the ship is in transit. There are different types of tanks used in LNG ships, each with its unique characteristics and advantages. Let's explore some of these tanks in detail.

1. Membrane Tanks:

Membrane tanks are a widely used type of tank in LNG ships due to their high storage capacity and lower structural weight. These tanks consist of a thin, flexible membrane made of advanced materials such as Invar or stainless steel. The membrane is supported by insulation to maintain low temperatures and protect it from external forces. Membrane tanks provide excellent leak-proof performance and can be designed in various shapes to fit the hull of the ship.

2. Independent Tanks:

Independent tanks, also known as spherical tanks, are another type commonly found in LNG ships. These tanks are constructed as separate units and are located within the ship's hull. Independent tanks have a robust design and can withstand high pressures. They offer efficient utilization of available space, making them suitable for smaller LNG carriers. However, their capacity is limited compared to membrane tanks.

3. Moss-Type Tanks:

Moss-type tanks are a widely used tank design due to their reliability, efficiency, and long-term durability. These tanks consist of a steel membrane supported by a cylindrical hull and an inner insulation layer. The steel membrane provides strength to the tank, while the insulation layer helps maintain low temperatures. Moss-type tanks have a high storage capacity, making them suitable for larger LNG carriers.

4. GTT Mark III Tanks:

GTT Mark III tanks are a type of membrane tank that offers enhanced safety features. These tanks have an intricate containment system that decreases the possibility of leaks or structural failures. GTT Mark III tanks provide superior resistance against sloshing and reduce the risk of damage during rough sea conditions. They are often chosen by LNG shipbuilders looking for enhanced safety measures.

5. IHI SPB Tanks:

IHI SPB (Self-supporting Prismatic Shape IMO Type B) tanks are known for their high storage efficiency, enhanced safety, and stability. These tanks have a prismatic shape and are made of a combination of stainless steel, aluminum alloy, and metallic foam insulation. IHI SPB tanks have a simple design, making them cost-effective and easy to maintain.

In conclusion, the type of tank installed in an LNG ship depends on various factors such as vessel size, storage capacity, safety measures, and construction costs. Each tank design brings its advantages and considerations, and shipbuilders carefully select the right type of tank for their specific requirements. Whether it's membrane tanks, independent tanks, Moss-type tanks, GTT Mark III tanks, or IHI SPB tanks, all play a crucial role in ensuring the safe and efficient transportation of liquefied natural gas across the seas.

For more information about LNG ships and their tanks, feel free to contact us.

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