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Guidelines on Hull Structure of Thermoplastic Vessels 2021 Section 4 Manufacture 4.1.1.1 Premises for manufacturing of vessels of polyethylene are to be suitable for the production process applied. 4.1.1.2 Such vessels can be manufactured either by rotational moulding or welding. 4.1.1.2 Uncontrollable draughts are to be avoided in the vicinity of the production machinery and in cooling rooms. 4.1.1.3 Premises and production machinery are to be arranged to avoid risk of pollution by oil spill, dust etc. 4.1.2 Marking of produced vessels 4.1.2.1 The vessel is to have a durably fitted plate or similar which clearly states the structural material of the vessel. 4.1.2.2 The vessel manufacturer is to supply the following with each vessel: information on the vessel's presupposed use, directions for maintenance and repair as well as information on substances which may have detrimental effects on the vessel's structural material. 4.2 Rotation Moulding 4.2.1 General 4.2.1.1 In rotational moulding, rigid, resilient hollow bodies are formed by powdered plastic material in heated molds, which are rotated simultaneously in two planes perpendicular to each other. The plastic particles make contact and melt on the inner surfaces of the hot molds and fuse in layers until all the powder is fused and the desired end product and wall thickness is obtained. The wall thickness is controlled by the amount of powder placed in the mold. Rotationally molded pieces are stress-free except for slight shrinkage forces because the pieces are produced without any external pressure. Additionally, there is practically no scrap in rotational molding. 4.2.1.2 Raw materials may be approved in accordance with Section 2. No materials built into the vessel are to have detrimental effects on the other materials applied. 4.2.1.3 If the vessel manufacturer is to grind granulate to powder, the grinding and sieving equipment are first to be approved by IRS. 4.2.1.4 A pigment of approved type and in the approved quantity is to be added to the powder. During or after the grinding the powder is to be sifted through a mesh of not more than 800 microns. 4.2.1.5 Material moulded in accordance with the vessel manufacturer’s procedure is to at least have properties as given in Table 2.2.1(a) and Table 2.2.1(b) or Table 2.2.1(c). 4.1 General 4.1.1 Premises Indian Register of Shipping IRS-G-DES-12 Page | 10PDF Image | Hull Structure of Thermoplastic Vessels 2021
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