STRUCTURE DESIGN OF CARGO TANKS IN RIVER LIQUEFIED GAS CARRIERS
Design procedure of cargo tanks in River Liquefied Petroleum Gas Carriers is presented. The independents cylindrical tanks of type C, operating up to design vapor pressure of 20 bar, are considered. Classification Rules of Germanischer Lloyd are followed. The tank design includes determination of shell thickness (cylindrical, spherical and toroidal), check of shell stability, scantling of vacuum rings and stiffening rings which transfer tank load to the ship structure. For this purpose the finite element analysis is employed. The design procedure is illustrated in the case of a river ship equipped with eight tanks (diameter / length, 4.73 / 21 m) in two rows and it may be used as design standard.