Calculation of Boil-Off Rate of Liquefied Natural Gas in LNG carrier

Na početku rada dana je detaljna analiza fizikalnih svojstava prirodnog plina. Zatim je objašnjena i opisana svaka komponenta lanca proizvodnje i distribucije prirodnog plina od proizvođača do potrošača. Taj lanac se sastoji od crpljenja plina, obrade plina, ukapljivanja, transporta, prihvata, ponovnog isparavanja te odvoda do potrošača. U drugoj polovici rada opisan je pomorski transport ukapljenog prirodnog plina. Objašnjene su osnovne operacije na brodu kao i postupci ukrcaja i iskrcaja tereta. Zatim je opisan sustav otparivanja prirodnog plina (boil-off) i metode njegova korištenja na brodu. Ukratko su objašnjeni i prikazani propulzijski sustavi koji se najčešće koriste na LNG tankerima. Na kraju rada napravljen je proračun količine isparenog prirodnog plina za zadani spremnik tereta tipa Moss.
At the beginning of the paper, a detailed analysis of the physical properties of natural gas is given. Each component of the natural gas production and distribution chain from producer to consumer is then explained and described. This chain consists of gas deposits, gas processing, liquefaction, transport, gas reception, re-evaporation and discharge to consumers. In the second half of the paper, the sea transportation of liquefied natural gas is described. Basic shipboard operations as well as cargo loading and unloading procedures are explained. Then the natural gas evaporation system (boil-off) and methods of its use on ships are described. The propulsion systems most commonly used on LNG tankers are briefly explained and presented. At the end of the paper, a calculation of the amount of evaporated natural gas is made for a given Moss-type cargo tank.