Dileepa Nishan 212227Differences between

LPG carrierLNG carrier

*LPG carries other gases like ammonia, propylene, ethylene as their construction and equipments are suited to carry such gases as well.* low pressure and temperature need to maintain relative to LNG* Relatively cheaper than LNG carrier

*LNG gas or Liquefied Natural gas *temperature needs to maintain at -120C and -170C* Expensive installation

carriage requirements

compressor room compressors andrefrigerationplantsnitrogen bank as well as an inertgas generatorwith dryer systemTanks should be fully refrigerated at cargo boiling point.Required of cargo temperature and environmentdatamonitoring system Must have a cargo tank with double layer ofinsulation protection.Material used for tank must havevery low coefficient of thermal expansionbe provided with vaporizer tomeetits own vapors requirements.gasification plantis required

Chemical tanker

Type 1 shipType 2 ship

products with greatest overall hazard which require maximum preventive measures to preclude an escape of such cargo* must be able to survive assumed damage anywhere in their length.* most dangerous products should be located outside*Maximum tank size is 1250 M3*Double side width B/5 or 11.5 meters whichever is less but not < 760mm*Auto ignition temperature of cargoes 50% by volume in airProducts with appreciably severe environmental and safety hazards which require significant preventive measures to preclude an escape of such cargo.* if more than 150m in length, must be able to survive assumed damage anywhere in their length ; if less than 150m, the ship should survive assumed damage anywhere except when it involves either of the bulkheads bounding machinery spaces located aft.* cargoes should be located at least 760mm from the ship's shell and outside* Maximum tank size is 3000 M3* Capable of stripping tanks