ATBECHDEDKESFRGBGRITLILUNLSEMCPTIESILTLVFIROMKCYALTRBGCZEEHUPLSKBAHRIS..MTNORSMESM..................JDIM360 Ver 2.15 (14 Jul 2008) - 1620000/02392825EUROPEAN PATENT APPLICATIONA320111221EP11166316.72011051720110517enenen201012995620100607JP2011122120115120111207201149F04B 49/00 20060101AFI20111116BHEP F17C 9/02 20060101ALI20111116BHEP F04B 25/00 20060101ALI20111116BHEP F04B 49/06 20060101ALI20111116BHEP F04B 49/10 20060101ALI20111116BHEP deVerfahren zur Steuerung eines mehrstufigen BOG-KompressorsenMethod for controlling the operation of a multistage boil-off gas (BOG) compressorfrProcédé de commande du fonctionnement d'un compresseur à plusiers étages pour des vapeurs émassant de gaz naturel liquéfié1Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)100154043EP6393810-26, Wakinohama-cho 2-chome, Chuo-kuKobe-shi, Hyogo 651-8585JPTakagi, Hitoshic/o Takasago Works in Kobe Steel, Ltd. 3-1, Shinhama 2-chome, Arai-choTakasago-shi, Hyogo 676-8670JPNagura, Kenjic/o Takasago Works in Kobe Steel, Ltd. 3-1, Shinhama 2-chome, Arai-choTakasago-shi, Hyogo 676-8670JPTBK100061560Bavariaring 4-680336 MünchenDEALATBEBGCHCYCZDEDKEEESFIFRGBGRHRHUIEISITLILTLULVMCMKMTNLNOPLPTRORSSESISKSMTRBAME20111221201151

Method for controlling the operation of a BOG multistage compressor (8) including plural stages of compression sections (9,10), which are connected with each other, for compressing boil-off gas (BOG) generated from liquefied natural gas. The method comprises, in case of a predetermined condition, making a ratio of a load on a low pressure stage compression section to a load on a high pressure stage compression section (load ratio) smaller than load ratios in case of conditions other than the predetermined condition. The said predetermined condition is, either a condition where the suction temperature of the low pressure stage compression section (9) is not lower than a first preset temperature, or a condition where the discharge temperature of the low pressure stage compression section (9) is not lower than a second preset temperature. This control method prevents the temperature of the low pressure stage compression section (9) from exceeding a maximum allowable temperature.