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Water tube boiler:
The boiler in which the water is present inside the tubes and fire or hot gases surrounds these fire tubes.
The examples of water tube boilers are a La-Mont boiler, Benson boiler, Stirling boiler, Babcock and Wilcox boiler, Yarrow boiler and Loeffler boiler.
Advantage:
| SL NO | Advantage |
| 1. | The maximum working pressure of the water tube boiler is 250 bar. |
| 2. | Overall efficiency is up to 90% with an economizer. |
| 3. | It requires less floor area for a given output. |
| 4. | Load fluctuation can be easily handed. |
| 5. | The rate of steam generation and the quality of steam for suitable power generation are much better. |
| 6. | This can be used in large power plants. |
| 7. | The direction of water circulation is well defined. |
Disadvantage:
| SL NO | Disadvantage |
| 1. | Complex design and High maintenance cost. |
| 2. | A skilled operator is required for operation. |
| 3. | This is used in large power plants and it is uneconomical for use in small industries. |
| 4. | For the same power output, the cost of a water tube boiler is high. |
| 5. | Treatment of feed water is very essential in a water tube boiler as small-scale deposits inside the tube can cause overheating and bursting. |
Application:
Water-tube boilers are widely used in industries
| Such as sugar mill, |
| The chemical industry, |
| The paper mill, a textile factory, |
| Central heating enterprise, |
| A power plant, and so on. |
