| With the rapid development of China’s economy,the domestic demand for ethylene products is also growing significantly.Meanwhile,due to the "shale gas revolution" in the United States,the trade of associated ethane and ethylene resources is becoming quite strong in global market,which drives the demand for another revolution of ethylene shipping industry.Therefore,a large number of orders for producing liquefied ethylene/ethane carriers have been created.One typical demand is the 85,000 cubic meters liquefied ethylene/ethane carrier,as an innovative liquefied gas carrier.It has a super large type-C trilobe tank,which is of the largest scale in volume and weight,and the structure is the most complicated one.So,it is of great challenge when it comes to design and producing.This paper starts from the structural characteristics,sectional division,construction process,lightering mode and other aspects of the super-large marine type C tribole tank,and focuses on three key technological mechanical points in the manufacturing process of the type C tribole tank---the total block turning-over scheme,the design of the large erection saddle and the design of the hydraulic test bracket.The scheme is demonstrated from the aspects of scheme design,construction attention points,and combines the finite element analysis method to ensure the feasibility of the scheme in theory.Above three aspects including turning over in blocks,closing the jig frame and hydrostatic test studied in this topic have been successfully applied in the construction of the world’s first 85,000 cubic meters of super-large marine type C tribole tank,and it proves that the research results of this project have extremely high practical value. |
