Third plug is made from copper is locked with the second plug by pouring metal in to the grooves provided on the both plugs. A boiler is a closed vessel in which water is heated, vaporized and converted into steam at a pressure higher than the atmospheric pressure. The various boiler mountings and accessories that are used in steam boilers are water level indicator, pressure gauge, safety valves, stop valve. Fusible plug is a fitting used in steam boilers to enhance the safety during operation. Boiler mountings and accessories mechanical booster. The working life of such a boiler can be considerably shortened if. Fusible plug is a small device installed in small horizontal fire tube boilers between furnaceburner, usually natural gas fired or oil fired and boiler water drum for.
Economiser, fusible plug for boiler safety water tube boilers fire tube boilers water cum smoke tube boilers small industrial boilers vertical i. In todays article, you are gonna get a brief knowledge on boiler accessories and mountings. Reliability of fusible tin boiler plugs in service nvlpubsnistgov. It protects the boiler against damage due to overheating for low water level. The fusible boiler plug in its usual form consists of a brass or bronze casing with external pipe thread, filled from end to end with a fusible metal or metal. Fusible plug is a small device installed in small horizontal fire tube boilers between furnaceburner, usually natural gas fired or oil fired and boiler water drum. The fusible plug consists of two hollow guns and one conical plug shown as figure. Swagelok fusible plug and a swagelok mud dauber fitting. The fusible plug melts if the external temperature reaches f c, relieving pressure in the. Misra boilers pvt ltd offering fusible plug for boiler safety. A steam boiler is a closed vessel, generally made of steel, in which water is heated by some source of heat produced by combustion of fuel and ultimately to generate steam. In steam engines the fusible plug is screwed into the crown sheet the top plate of the firebox, typically extending about an inch 25mm into the water space above. A steam boiler was fitted with a small observation window of glass and heated beyond.
Fusible plugs for model loco boilers model engineer. It is fitted on the fire box crown plate or over the combustion chamber at. Boiler mounting fusible plug anuniverse 22 youtube. Green berets ultralight bug out bag with gear recommendations duration. Fusible plugs are installed between the fireside of either the plate, flue or tube of the boiler and below the water level. Main function of fusible plug in boiler thermodyne. Its working depends upon the water level in the boiler shell.
A fusible plug operates as a safety valve when dangerous temperatures, rather than dangerous pressures, are reached in a closed vessel. Boiler room log books, fusible plugs and accessories. It is important that the boiler records and plug diagram see item7 above detail which form is in use on a boiler and that the fusible plugs and any spares are appropriately marked. Fireside fusible plug model 28403 conforms to asme standards, with maximum pressure of 250 lbs. An investigation of fusible tin boiler plugs nvlpubsnistgov.