1. What is boiler mountings & its purposes?
Ans. Boiler mountings are installed for safety of a boiler. Examples of boiler mountings are water level indicator, steam stop valve, man hole, pressure gauge, safety valve, feed check valve etc.
2. Purpose of water level indicator in boiler?
Ans. Water level indicator constantly indicates the level of water inside the boiler. The water level in a boiler must not fall below a certain safe-level. If the level of water inside the boiler happens to fall below safe-level, crack and leak can occur.
3.What is the purpose of guard glass in a glass-tube water level indicator?
Ans. The guard glass is tough. It doesn’t give shards on breaking. Guard glass covers the gauge glass. If due to sudden rush of water and steam the gauge glass breaks, the guard glass protects the attendant from getting hurt.
4. What is the purpose of pressure gauge?
Ans. Pressure gauge measures the pressure exerted inside the boiler shell. Normally, it is manufactured to indicate pressure up to double the maximum working pressure. It measures gauge pressure i.e. pressure above atmospheric pressure.
5. What is compound pressure gauge?
Ans. A compound pressure gauge is designed such that it can measure pressures above and below atmospheric pressure. It is a pressure gauge, hence mounted on the front top of the shell.
6. Purpose of syphon tube in the Bourdon pressure gauge?
Ans. Syphon tube is an integral part of the Bourdon pressure gauge. The syphon tube is completely filled with condensed water. Steam pressurizes the water in the syphon from one side and the water is forced into the elliptical tube.
7. The function of a safety valve is?
Ans. A safety valve releases excess steam if the steam pressure exceeds the rated pressure. The safety valve automatically opens when the pressure exceeds the limit and closes automatically when the pressure reduces to acceptable value.
8. Types of safety valve?
Ans. The types of safety valve are – high steam and low water safety valve, dead weight safety valve, spring loaded safety valve and lever safety valve. The purpose of safety valve is to release excess steam when the steam pressure exceeds the design pressure.
9. Is an attendant is required to operate the safety valve?
Ans. No, the safety valve automatically opens once the steam pressure exceeds the rated pressure and it automatically closes when the pressure drops down to permissible value. Safety valves are usually mounted on top of the shell.
10. Why dead weight safety valve is not suitable for high pressure boilers?
Ans. Large amount of weights will be required to balance high pressure; therefore, it is not suitable for high pressure boilers. It is used in low pressure and low capacity boilers. It cannot bear vibrations and movements, hence not suitable for locomotive boilers.
11. Which safety valve is suitable for locomotive and marine engines & why?
Ans. Spring loaded safety valve unlike dead weight safety valve and lever safety valve is unaffected by vibrations and movements in vertical directions. It is therefore suitable for locomotive and marine engines.
12. High steam and low water safety valve generally suitable for which type of boiler?
Ans. High steam and low water safety valve is not suitable for locomotive and marine engines. It is designed such that when the steam pressure exceeds a certain pressure limit or when the water level falls below a certain limit the valve opens and the steam is released to atmosphere.
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