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- BOILER QUESTIONS AND ANSWERS Q. What is boiler. A. According to Indian Boiler Act 1923, a boiler is a closed pressure vessel / steam generating unit with minimum capacity of 22.70 liters, including all mountings and accessories. Q. What is circulation ratio of a boiler. A. It is the ratio of the quantity of water-steam mixture flowing through the circuit to the quantity of steam produced in the circuit , The circulation ratio of once through / super critical boiler is one because all water Is converted to steam. The circulation ratios of 1. Natural circulation industrial boiler - 10 to 15 2. Natural circulation utility boiler - 7 to 9 3. Assisted circulation boilers - 2 to 4 4. Forced circulation / once through boiler - 1 Q What are the boiler mountings. A. The boiler mountings are used for safe and efficient operation of boiler, these are placed in out side of the boiler. 1. Safety valve. 2.pressure gauge. 3.Water level gauge glass.. Pressure gauge. 4. Start-up vent. 5.Air vent ...
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