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Dyna-Therm Steam Drums

Steam Drums | Boiler Drums | Boiler Steam Drums

The steam drum is the most important part of a boiler. Dyna-Therm’s expertise and experience in steam drums provide our clients with successful boiler operations.

The most important job of the steam drum is to ensure the exit steam is as dry as possible and returns the water to the condensate return system. Any water or moisture in the exit steam will carry solids in it. This, of course, causes many problems in the system such as fouling and erosion, resulting in downtime and repairs to the boiler and other downstream equipment.


The steam is removed from the riser mixture, sending steam (free of water) through the boiler system to prevent damage from carryover of wet steam. The drum storage water (free of steam) allows liquid levels, chemical feed and feedwater to be properly controlled. The steam is polished before exiting and sent to the superheater or other downstream processes.

The steam drum is designed to ensure natural circulation is maintained and/or prevents circulating pumps from cavitation in that case. Improperly designed steam drums can precipitate issues downstream to other equipment in the system and will be expensive to operate and repair, causing a need for shorter maintenance schedules and reduced life cycles of the boiler.

Horizontal Steam Drums

There are two types of horizontal steam drums: 1) a water tube steam drum, and (2) a waste heat steam drum. Both types of steam drums have the primary and critical purpose of mechanical phase separation of the water and steam mixture which flows from the Heat Recovery System Generator (HRSG) evaporator or boiler tubes into the drum from a fired boiler. The steam water mixture is disengaged in the drum in the primary separators. The steam drum water is free of suspended steam and allows liquid levels, chemical feed and feedwater to be properly controlled. After the steam is removed from the water, it is polished and ready to exit the drum to perform downstream tasks.

Excessive carryover (water and solids leaving the steam drum with the steam) can lead to serious problems such as:

  • Tube fouling, resulting in tube overheating and corrosion.

  • Reduction of steam turbine efficiency and corrosion or erosion, resulting in blade deposits and nozzle fouling.

  • Contamination of products or catalysts contacted by wet steam.

Dyna-Therm’s high pressure steam drums deliver a standard of 99.986% quality steam with a standard of 0.5 PPM/TDS of water/solids carryover to downstream superheaters or process equipment. Both high and low pressure drums can be made to attain a higher guarantee as low as 0.1 PPM/TDS with 99.995% quality steam.

Why choose a Dyna-Therm Steam Drum?

  • Reduces deposits on turbine blades, superheaters, fractionators and reactors.

  • Reduces maintenance and increases up time.

  • Reduces overall operating costs through reduced feed stock.

  • Increases overall boiler operating efficiency.

  • Reduces continuous blowdown.

  • Stabilizes liquid levels.

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