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The comparison of theoretical to practical cargo loading rate of butane - analysis of LPG carrier reliquefaction plant

Nanowski D.

Journal of KONES

2013

Vol. 20, No. 1

227--231

This paper presents a performance of reliquefaction plant analysis in order to assess possible cargo loading rate for Butane (C4H10). The highest cargo loading rate is essential in use of LPG carriers because of economical point of view. Loading and discharging cargo time at ports substantially influences on a financial effect of the ship owner. Because of different cargo grades, which number is continuously increasing, crucial is to know real efficiency of gas plan, before signing some contract with customer. On board these types of ships the highest efficiency of reliquefaction plant is crucial. After short description of fully refrigerated gas carrier, theoretical data of analysed ship, taken from ship documentation is shown. Taking into account this data, expected cargo compressors parameters and cargo loading rate are discussed, explained and assumed. In next step, real ambient Butane loading process carried out on board LPG carrier is described. All essential values and reliquefaction plant readings, taken in loading port are presented. The comparison of theoretical result based on available documentation to practical effects obtained in the port is performed. Analysis, mainly taking into account gas plan, answers if it operated with the highest possible efficiency and met cargo loading parameters expected according to ship manuals. Conclusions are discussed.