In general boiler is supposed to generate large quantity of steam at desired pressure and temperature quickly and efficiently.
- It must contain enough steam and water storage capability to meet fluctuation in demand and to prevent variation in steam pressure or water level.
- It must be able of generating steam at preferred rate at preferred pressure and temperature by minimum fuel utilization and cost.
- Its construction must be simple and include good workmanship for ease of inspection and repairs that is simply accessible parts.
- There must be minimum frictional power loss during flow of hot gases and water/steam that is pressure drop throughout the system must be minimum.
- Tubes must be so planned so as to have smallest soot deposition and good power against wear. Boiler must contain a mud drum to receive all impurities.
- Boiler should contain its heating surface almost at right angle to current of hot gases for good heat transfer.
- Boiler must have capability to get started rapidly from cold.
- Boiler must contain a constant and thorough flow of water.
- It must be equipped with all required mountings.
- Boiler must have strength to bear up excessive thermal stresses.
- Boiler should absorb less floor area and space.
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