3) Fusible plug • Function: To extinguish fire in the event of water level in the boiler shell falling below certain specified limit. Download The American Political System Kollman Pdf Free. • It protects fire tubes from burning when the level of the water in the water shell falls abnormally low and the fire tube or crown plate which is normally submerged in the water, gets exposed to steam space which may not be able to keep it cool. • It is installed below boiler's water level. • When the water level in the shell falls below the top of the plug, the steam cannot keep it cool and the fusible metal melts due to over heating. Thus the copper plug drops down and is held within the gunmetal body by the ribs. Thus the steam space gets communicated to the firebox and extinguishes the fire.

Thus damage to fire box which could burn up is avoided. • By removing the gun metal plug and copper plug the fusible plug can be put in position again by interposing the fusible metal usually lead or a metal alloy. 4)Safety Valve Function: The function of safety valve is to release the excess steam when the pressure of steam inside the boiler exceeds the rated pressure. There are 4 types of safety valves: i) Lever Safety Valve The disadvantage of this valve is that it admits of being tempered with, and the effect of a small addition to the weight is magnified considerably in its action on the value.

Ii) Spring Loaded safety Valve • For locomotives and marine engines both the lever and dead weight types are unsuitable for obvious reasons, and the valve must be spring loaded, as such valve is unaffected by vibration or deviation from the vertical. • Disadvantage: One disadvantage of this valve is that the load on the valve increases as the valve lifts, so that pressure required just to lift the valve is less than that required to open it fully. Iii) Dead Weight Safety Valve • It is mainly used for low pressures, low capacity, stationary boilers of the Cornish and Lancashire types. • Merits: 1)Simplicity of design 2)Gives quite a satisfactory performance during operation.

3)It cannot be easily tempered from the pressure adjustment view. • Demerits: 1)Unsuitable for use on any boiler where extensive vibration and movement are experienced( e.g.

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