Abstract: A method and a building system for manufacturing a floating structure, for instance a watercraft, in which method the hull part for the floating structure is formed, it is provided with deck structures or similar support structures, and space units are prefabricated and installed between said deck structures or similar support structures. In the method such space units are manufactured, which comprise engineering units, which are provided at least with WC-equipment, as well as room units so that an engineering unit interconnected with a room unit forms a cabin unit. The engineering units of two adjacent cabin units are prefabricated and joined together to form an engineering unit pair and the thus accomplished engineering unit pair is transferred to and installed in its place on the floating structure.

Abstract: A method and arrangement for reducing the weight and optimizing the longitudinal strength of a watercraft, which is especially suitable for transportation of liquefied natural gas (LNG) or other corresponding mediums and comprises a hull, which has a deck extending over at least the main part of the watercraft and a number of substantially spherical cargo tanks arranged successively in the longitudinal direction of the watercraft and a deckhouse, which extends substantially above the deck. The hull of the watercraft is provided with a continuous protective casing structure known as such and which is arranged on top of the cargo tanks. The deck of the watercraft is arranged on the hull so that the proportion of its height measured from the bottom of the watercraft to the height of the uppermost continuous portion of the protective casing structure on top of the cargo tanks is at most 0.55, preferably at most 0.5.

Abstract: The invention relates to an arrangement and a method for collecting oil from water in open water and/or winter conditions, whereby a vessel's (1) hull (2) and an oil collecting equipment (4) are utilized as an oil collector. According to the invention, the oil collecting equipment (4) is attached to the vessel's (1) hull (2) and it is equipped with an auxiliary device (7), which comprises at least two auxiliary means (10a,b) which are interconnected so that they are movable with respect to each other. The auxiliary means (10a,b) can be utilized in various ways in different conditions.

Abstract: The invention relates to an arrangement and a method for collecting oil from water in open water and/or winter conditions, whereby a vessel's hull and oil collecting equipment are utilized as an oil collector. According to the invention, the oil collecting equipment is attached to the vessel's hull and it is equipped with an auxiliary device, which comprises at least two auxiliary means which are interconnected so that they are movable with respect to each other. The auxiliary means can be utilized in various ways in different conditions.