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INTRODUCTION. LNG & LPG CARRIER. TYPES OF GAS CARRIER. FULLY PRESSURIZED SHIPS.

INTRODUCTION. LNG & LPG CARRIER. TYPES OF GAS CARRIER. FULLY PRESSURIZED SHIPS. SEMI PRESSURIZED/SEMI REFRIGERATED. INTRODUCTION. Gas carriers are ships intended for transportation of compressed or liquefied gas.

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INTRODUCTION. LNG & LPG CARRIER. TYPES OF GAS CARRIER. FULLY PRESSURIZED SHIPS.

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  1. INTRODUCTION. LNG & LPG CARRIER. TYPES OF GAS CARRIER. FULLY PRESSURIZED SHIPS. SEMI PRESSURIZED/SEMI REFRIGERATED.

  2. INTRODUCTION • Gas carriers are ships intended for transportation of compressed or liquefied gas. • Gas carriers are special types of ships that are used to carry highly inflammable gases under controlled temperature and pressure.

  3. LNG & LPG CARRIERS • Liquefied Gas carriers are specialized vessels that are used to transport Liquefied Natural Gas (LNG) and Liquefied Petroleum Gas (LPG) under controlled temperature and pressure. • Today there are approximately 1100 such types of ships at sea, throughout the world.

  4. TYPES OF CARRIERS • LPG carriers– Which are mainly used to carry liquefied gases such as butane, propane, propylene etc • LNG carriers – Which are specifically designed to carry, liquefied natural gas.

  5. FULLY PRESSURIZED SHIPS • This is the very first type of carrier that was used to transport gases. • With a cargo capacity of 3500 cubic meter, these ships are designed to work at a pressure of 17.5 kg/cm2. • Cargo is carried in cylindrical or spherical steel tanks with an appropriate storage temperature. All these ships are double bottomed. • Advantages….. • Disadvantages

  6. ADVANTAGES • Generally the cargo is carried at an ambient temperature and thus ordinary and less expensive steel is used to make the tanks. • No additional insulation is required. • No re- liquefaction plant is required. • Construction and operation is simple .

  7. DIS ADVANTAGES • Unusual tank shape make the under deck space unusable • Storing of a particular gas in the tanks depends on the thickness of the tank. Thus those gases that require high design pressure require thick-walled tanks, which increase the weight and cost. • As the tank diameter increases, the wall thickness increases. This increases the weight of the tank and reduces its capacity, which makes the ship uneconomical for use.

  8. SEMI PRESSURIZED/SEMI REFRIGERATED • This type of carrier has both refrigeration and pressurizing facilities. • They have full refrigeration facility with high design pressure for the cargo tanks. • The tanks are cylindrical in shape and thinner than the pressurized vessels. • Semi-pressurized, semi-refrigerated ships have a cargo carrying capacity of 5000 meter cube under temperature and pressure condition of -10 degree Celsius and 8.5 kg/ cm2 respectively.

  9. Larger vessels can carry at temperature of -48 degree Celsius. • A re-liquefaction plant on the ship can load the cargo as gas and liquefy it onboard. • Heating and cooling facilities are also provided for smooth discharging of the cargo. • They generally have 2-6 tanks and are double bottomed.

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