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Steam Drums The steam drum is the most important part of a boiler because it is where all the steam and water passes through. The steam is removed from the water sending the steam-free water back to the boiler system to prevent burnouts. This steam free water allows all liquid levels, chemical feed, and feedwater to be properly controlled. After the steam is removed from the water the steam is purified to be superheated, if necessary, and to perform its demanding tasks. The most important job of the steam is to ensure that the steam exits the drum as dry as possible and returns the water to the heat source steam free. The reason for this is that any water or moisture that may pass through a steam drum can and will carry solids in it, usually in their dissolved states. The steam drum also secures natural circulation and/or prevents circulating pump cavitation. This condition can precipitate down stream on other equipment in the system and can be expensive by causing a loss of efficiency or other costly repairs.
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This steam drum was built for use in a methanol plant 72” I.D. x 81’-0” tan/tan 4.25” thk. weight is 420000 lbs empty. The drum was designed to handle 600,900 #/hr of 1615 psig steam with the design pressure of the vessel at 1775 psig. The steam purity guarantee for this unit is 0.1 ppm/tds.
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