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Fisher™ ATST Steam-Atomized Desuperheater
Fisherâ„¢ ATST Steam-Atomized Desuperheater
The Fisher ATST desuperheater represents the state-of-the-art solution for desuperheating applications which demand ultimate performance in atomization and rangeability.
Using steam-atomized water injection, ATST nozzles form extremely fine water droplets which vaporize quickly in a wide range of steam flows and conditions.

Guard Against Attemperator Overspray Damage With Fisher ATST Desuperheaters

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Fisher™ ATST Steam-Atomized Desuperheater


Critical Service
Steam Conditioning
SA105, F22, F91
Operating Temperature
High Temperature
Pressure Class
Process Connection Type
Flanged, Butt Weld, RTJ, Socket Weld
Valve Size
NPS 8 through 48
Valve Size Standard
Other Configurations
Contact your local Emerson sales office to learn about additional specifications or options for this product.


  • Steam-Atomized Water Injection — The ATST desuperheater incorporates steam-atomized nozzles that uses high speed vapor to break water into extremely fine droplets over a wide operating range.
  • Temperature Control Confidence — The extremely fine mist exiting the ATST spray nozzles results in fast vaporization without spray water fallout into downstream piping. Ensures spray water controls steam temperature instead of falling out.
  • Improves Steam Pipe and Liner Integrity — The combination of fine spray, even mixing of water/steam, and extremely fast vaporization protect steam pipes and liners from overspray quenching damage.
  • High Rangeability — The ATST steam-atomized attemperator does not rely on water pressure or steam velocities to generate spray. The fine mist created by the ATST can be injected into low steam velocities without sacrificing temperature control.
  • Available Steam Pipe Liner — The ATST has the option of an integral steam pipe liner. This construction is common in boiler interstage attemperation applications for additional protection against water impingement