Latvian Maritime academy

performance of design. Speed is the most significant factor of any ship. By repeatedly adjusting the hullform and tank testing, manufacturer ensure that the ship they are building can sail at the speed stipulatedin the specifications. When the preliminary design has been selected the following information isavailable: dimensions, displacement, stability, propulsive characteristics and hull form, preliminarygeneral arrangement, principal structural details. Each item of information may be considered in moredetail, together with any restrains placed on these items by the ships service or other factors outside thedesigner’s control. Also ships build in CESA countries must pass the standard form of contract betweenbuilders and purchasers to ensure relationships between them. This contract includes:Subject of contract (vessel details, etc.); inspection and approval; modifications; trials; guarantee(speed capacity, fuel consumption); delivery of vessel; price; property (rights to specifications, plans etc.and vessel during construction and on delivery); insurance; default by the purchaser; default by thecontractor; guarantee (after delivery); contract expenses; patents; interpretation, reference to expert andarbitration; condition of the contract to become effective; legal domicile (of purchaser and contractor);assignment (transfer of rights); limitation of liability [13].There are three main factors affecting the technical feasibility and profitability of a ship. Thedeadweight/displacement ratio indicates the carrying capacity, the speed and power in relation to the totaldisplacement, and third factor is lightweight density, which is an easy way to a first a first weight estimatefor different ship types [14]. The key function of basic design is to design the ship so that all those factorscomply with the specifications that the customer desire. Based on the information obtained from the basicdesign, the detailed design plays the role of clarifying the design of components and parts of the ship tobe built. The key point of this step is to work out drawings that are accurate enough to facilitate the actualshipbuilding operation on-site without compromising the ability or performance of the ship.Figure 4. Shipbuilding process scheme [13]Then the production design is organized as the information in the detailed plans into respectivecomponent information. The production design enables the field staff to carefully control a large amountof components on site. Then the material ordering take place. After it the production process starts. It hasa critical impact on manufacturing efficiency because of the enormous amount of components, and thelarge number of workers involved on the job site. It is vital, therefore, to plan thoroughly so the processwould go fast and efficient. After production plan steel plates are being cut, bent, curved, shaped andother how processed according to the blueprint. The cut and processed components are assembled byblocks starting from small ones and assembling to the large ones to increase manufacturing efficiency.77