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a Fac ulty of Mar i time Tech nol ogy, West Pom er a nian Uni ver sity of Tech nol ogy, Szczecin, Po land b Fac ulty of Me chan i cal En gi neer ing Kraljevo, Uni ver sity of Kragujevac, Ser bia c Strata Ma rine & Off shore AS, Oslo, Nor way Orig i nal sci en tific pa per UDC: 673.6:620.16:66.011Fi nite el e ment method anal y sis of main lines of hy drau lic cen tral load ing sys tem instal la tion ex pan sion loops mounted on prod uct and chem i cal tank ers has been presented in the pa per. The ax ial forces prob lem in in stal la tions mounted along the ship's open decks ex e cuted from hull de for ma tions on waves and ther mal stresses is given. Use of "U" type ex pan sion loops is de scribed. Re sults of forces in an chor points and stresses of Mises due to ex pan sion loop de for ma tions are shown. Cal cula tions were made by ABAQUS Ver.6.7 FEM com puter pro gram. In tro duc tionProd uct and chem i cal tank ers are ships in tended to the trans port of dan ger ous, pe troleum-based liq uid car goes and chem i cals (see fig. 1). There fore many types of pipes are installed on decks of the prod uct and chem i cal tank ers as ships in tended to the sea car riage of liquid car goes. One of the most im por tant in stal la tions are hy drau lic in stal la tions of cen tral sup ply ing sys tems, in tended to the drive hy drau lic sub merged cargo pumps [1][2][3][4][5]. Work ing condi tions un der which these hy drau lic in stal la tions are ex ploited at sea are ex tremely dif fi cult. This is the re sult of spec i fic ity of prev a lent cir cum stances on board of sea-go ing ves sels. One of the most im por tant prob lems is in flu ence of changes of the am bi ent tem per a ture, changes of the de gree of so lar ra di a tion, and tem per a tures of transfluent hy drau lic oil on stresses and ten sions in pipes of hy drau lic in stal la tions.It takes root that the change of the length of the line is pro por tional to the change of the tem per a ture of line ma te rial [6]:Banaszek, A., et al.: Finite Element Method Analysis of Pipe Material Temperature .

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