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Register to Remove Trial Watermark!! Wall thickness: Owing to limitations of rotational moulding process, the wall thickness of the water storage tank at bottom, top and cylindrical sides at the bottom and top edges where the shape of tank changes is usually found to be much greater than the wall thickness at other surfaces. For cylindrical vertical tanks the wall thickness upto the effective height of the tank shall not be less than the values given in table and the wall thickness above the effective height of the tank shall be not less than 75 per cent of the values given in table. For rectangular loft tanks the wall thickness shall be in accordance with the values. The wall thickness shall be measured on the sides, top and bottom. Thickness measurement on lid shall be made at least in four well-distributed locations. Dimensions: The dimensions refer to finished empty tanks. Measurement shall be made after 48 hours of moulding. The wall thickness may be measured with a dial gauge micrometer fitted with spherical anvils. The overall diameter, height and other dimensions may be measured with steel rule or steel tape of desired accuracy by placing the empty tank on a flat surface. Multi layer wall tanks: Rotational moulded polyethylene water storage tanks may be manufactured in single layer or double layers, inner layer being white in colour. The outer layer shall be black in colour and its thickness shall be minimum 50 percent of the total thickness of the wall. The finish: The internal and external surface of the water storage tank shall be smooth, clean and free from other hidden internal defects, such as air bubbles, pits and metallic or other foreign material inclusions. The mould parting line and excess material near the top rim of the tank shall be cut and finished to the required level. Defects like air bubbles and pits are mould parting line and at top rim of the main-man-hole shall be repaired by hot-air filler rod welding method. 3.7 Target market and marketing strategy Construction of sites of the new building, areas of major construction activities shall be the target markets for overhead water tanks. Normally, overhead water tanks are marketed through building hardware stores. However, in case of large building complexes, sometimes orders for supply of tanks are placed directly with the manufacturing company. Semi-urban and rural areas would be the major target markets for septic tanks. Commercial complexes, hospitals, schools, institutions and offices would constitute a major market segment for dustbins and other containers. The unit also needs to tap the rural market for supplying containers for storage, handling and transport of agricultural and horticultural products. Register eDocPrinter PDF Pro Online Now!! 17PDF Image | ANALYSIS OF ROTO-MOULDED PLASTIC CONTAINERS
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