A trunk extending above a hold which is intended for stowage of liquid cargo. The surface of the cargo liquid is kept sufficiently high in the trunk to permit of expansion of the liquid without danger of excessive strain on the hull or of overflowing, and of contraction of the liquid without increase of the free surface and its accompanying effect upon the stability of the vessel.
Indawo yemithwalo ephumela ngaphezu kwegumbi lemithwalo elenzelwe ukugcinwa kwemithwalo engamanzi. Umphetho womthwalo wamanzi ugcinwa uphezulu ngokwaneleyo. Kwindawo yemithwalo ukuvumela ukwanda kolwelo ngaphandle kwemigudu emininzi, kwikhatshu okanye ekuphalaleni nasekuncipheni kolwelo ngaphandle kongezelelo lomphezulu ovulekileyo ndawonye nefuthe lawo kuzinzo lwenqanawe.