Engines have some blow. It is mostly got past the piston ring and into the crank case. To remove these, air is circulated through crank case when the engine is running. This is called crank case ventilation. The crank case ventilation system prevents build up and oil leakage. In addition, it removes blow by gas to prevent the formation of corrosion and sludge (sludge is thick , creamy , black substances that can form in the engine. It clogs oil screens and lines thereby preventing oil circulation)
Various types of melting furnaces are used in different foundry shops, depending upon the quantity of metal to be melted at a time, and the nature of work that is carried out in the shop. The primary objective in cupola is to produce iron of desired composition, temperature and properties at the required rate in the most economical manner. Besides, this furnace has many distinct advantages over the other types, e.g., simplicity of operation, continuity of production, and increased output coupled with a high degree of efficiency. Description Of a Cupola : The Cupola Furnace consists of a vertical, cylindrical steel sheet, 6 to 12 mm thick, and lined inside with acid refractory bricks or acid tamping clay. The refractory bricks or the tamping clay used consist of silicon oxide acid (SiO2) and alumina (Al2O3). The lining is generally thicker in the lower where the temperatures encountered are higher than in the upper region. The shell is mounted either on a brick work fo...
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