Why rifled tube is used in boiler?
Why rifled tube is used in boiler?
Internally rifled boiler tubes are used to evaporate water into steam inside boilers of thermal power plants. Because of their internally rifled shape, they are more efficient. The boiling crisis takes place later, thus allowing for greater heat transfer between the pipe and the fluid inside the pipe.
What are the tubes in a boiler for?
Boiler Tubes are metal tubes located inside of boilers that heat water in order to produce steam. There are two major types of tube boilers: water-tube boilers and fire-tube boilers. In water-tube boilers, water circulates inside the tubes and is heated externally by hot gases generated by the furnace.
How many tubes are in a boiler?
Fire tube boiler typically have three or four passes, although one and two pass boilers are also in use.
What causes failure of boiler tube?
Explanation: hardness of water causes failure of boiler tube. hard water consists of calcium and magnesium salts. hardness in water will form deposits on the tube water surfaces which will lead to overheating and failure of tubes. thus the salts have to be removed from the water.
Why do fire tube boilers explode?
When fire tube boilers run low on water, the metal in the boilers shrinks. In such an instance, if cold water is sent into the boiler, the metal could quickly expand, causing an explosion.
How do I know if my boiler tube is leaking?
The quantity of makeup water and hissing sound emitted by leaking steam is detected by human ears at the boiler. There are a number of systems for detection of Tube leakage available in both conventional boilers and recovery boilers [3, 4]. These systems detect the leakage flow or cracking with acoustic sensors.
Why does silica increase in boiler drum?
Due to silica content in the feed water goes to steam drum where separation of wet steam and water takes place and in this way silica content increased in Boiler drum.
How common is it for a boiler to explode?
While boiler explosions are rare today, they happened much more frequently a hundred and fifty years ago. Thankfully in 1880 the American Society of Mechanical Engineers (ASME) was founded.
Can a boiler explode if it’s turned off?
When boilers are sealed off, some water will remain and will eventually be heated to form steam, creating pressure. As internal pressure builds up, the jacket can explode because of the lack of water.
What are boiler tubes made of?
Boiler tubes are seamless tubes and are made of either carbon steel or alloy steel. They are widely used in steam boilers, for power generation, in fossil fuel plants, industrial processing plants, electric power plants, etc. Boiler tubes can either be medium-pressure boiler pipe or high-pressure boiler pipe.