Reasons for having External Downcomers

It is known that as the pressure and temperature increase, the density of water decreases. Thus the density difference between water and the steam reduces & thus at higher pressures, the natural circulation of water-steam is impaired.

water tubes boiler downcomers

Thus to maintain the natural circulation, external, unheated downcomers are fitted. These external downcomers are large bore tubes connecting the steam drum with the water drum.

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