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Guidelines on Hull Structure of Thermoplastic Vessels 2021 Table 3.3.2.1 (a) : Values for PFb V Length [m] [knots] 3 6 9 12 15 18 21 24 10 18 15 25 20 37 25 52 30 70 35 93 40 120 45 150 28 40 54 70 85 98 110 38 50 65 80 95 109 120 51 66 82 97 112 125 138 69 87 91 112 104 120 134 150 163 131 150 165 182 197 119 150 185 142 166 179 205 219 251 185 202 220 238 227 248 268 287 275 298 320 342 Table 3.3.2.1 (b) : Values for PFs V [knots] 3 6 9 12 15 18 21 24 10 17 25 37 54 71 89 15 17 26 38 55 72 90 20 19 28 40 57 74 92 25 21 30 43 60 77 97 109 129 110 130 113 133 118 138 Length [m] 30 26 36 48 66 83 35 32 42 56 72 90 40 40 51 63 80 98 45 50 61 73 90 108 3.3.2.2 The thickness of the inner hull is not to be less than: ti = 0.8 t [mm] 102 124 144 109 131 151 118 140 160 128 150 171 3.3.2.3 It is recommended that rotation moulded vessels are to have a hull weight of at least k x 45 kg. The vessel is to be stiffened in such a manner that keel, bottom or side shell is not deformed by normal load. 3.3.2.4 Proper stiffness is to be provided and demonstrated to IRS. For this purpose direct calculation methods may be utilized. 3.3.2.5 Scantlings of stiffeners are to be adequate with intended service of the vessel and to withstand loads to which the vessel may encounter. For this purpose direct calculations are to be submitted to IRS along with plans. The scantlings of primary and secondary stiffening members are to be determined by direct calculation where the vessel is of unusual design, form or proportions. 3.3.2.6 Transom for engine mounting is normally to be stiffened over its full breadth. Scantlings based on practical testing with simulated loads from the engine may be accepted. Indian Register of Shipping IRS-G-DES-12 Page | 9PDF Image | Hull Structure of Thermoplastic Vessels 2021
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