PHYSICS OF LIQUIFIED GASES

Code No: 642

Video Running Time: 48 minutes

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This video has been designed to assist officers in their preparation for service on board gas carriers. Emphasis is on the safety aspects of gas shipping, leading to a thorough understanding of the underlying principles involved in the handling of gas cargoes.

The video deals with the basic physics of gases and introduces the concept of Absolute Zero, the laws of gases - Boyle's law, Charles' law, Avogadro's observations, Dalton's Law on partial pressures and the General Gas Law.

Then the three phases of matter are discussed - solid, liquid and gas and the transitions between them which involve Latent Heat. This leads to consideration of Enthalpy and the effect of Pressure on boiling points. The use of Mollier Charts is explained. The laws of thermodynamics are also considered and the applications of these and the other laws to practical cargo systems is considered. The operation of single and two-stage compression systems and of refrigerated systems all depend on the principles we have defined.

The characteristics of LPG mixtures and the way in which these are affected by the methods of compression are discussed. Finally, batch and flash vaporisation are described.