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Guidelines on Hull Structure of Thermoplastic Vessels 2021 Section 3 Structural Design 3.1.1 Material properties are given in the tables for scantling calculation purposes as a reference. Those properties are to be validated by material test results. 3.1.2 The design of the vessel is to be suitable for the manufacturing process and the raw material being used. 3.1.3 When forming vessels of polyethylene, it is to be taken into consideration that the mechanical properties of the material vary with the temperature and the duration of the loading. 3.1.4 Hard points in the structure are as far as practicable to be avoided. Stiffening is to be evenly distributed over the hull, to the extent this is practicable. 3.1.5 The design is to be such that sufficient hull stiffness is obtained. Large flat surfaces are to be avoided as far as practicable. 3.2 Rule thickness 3.2.1 Rule thickness is the value stated in 3.3.2. 3.2.2 A measured thickness is regarded as satisfactory when the average of the values measured at 20 points is not less than the rule thickness and if none of the values measured at the individual points is more than 15% below rule thickness. 3.2.3 Local reinforcements that are welded or glued to the hull, may be specially considered as part of the skin thickness. 3.3 Scantlings 3.3.1 Scantling values obtained by direct calculation methods are not to be less than 80% of those stated in relevant empirical formula given below. 3.3.2 Hull Thickness 3.3.2.1The thickness of the outer hull bottom and side is not to be less than: 3.1 General Where: π‘τ°ππ τ°³ πτ°΄ τ°14τ°΅3.6πΏτ°¨ 6.7πΏ LDPE MDPE k 1 0.85 HDPE 0.72 s = stiffener spacing in metres PF = Pressure factor for bottom or side (PFb or PFS), as taken from the Tables 3.3.2.1 (a) and (b) below: Indian Register of Shipping IRS-G-DES-12 Page | 8PDF Image | Hull Structure of Thermoplastic Vessels 2021
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