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FISHER™DMA/AF-HTC Desuperheater

The DMA-AF-HTC is functionally equivalent to the DMA-AF, however it is structurally suited for severe applications. The most common applications include boiler interstage attemperation, where the desuperheater is exposed to high thermal cycling and stress, high steam velocities and flow induced vibration. In addition to this specific application, the DMA-AF-HTC is suitable for other severe desuperheating application environments. The DMA-AF-HTC uses a construction optimized to move weld joints away from high stress regions.

Main Features

The desuperheater design incorporates an integral thermal liner inside the desuperheater body pipe. This minimizes the potential for thermal shock when cool water is introduced to the unit that is already heated to the operating steam temperature.
Optimized spray pattern with selectable AF nozzle technology for a wide operating range for optimal mixing and fast vaporization in all conditions.
The nozzles can be easily removed, maintained or replaced without having to replace the entire unit.
Nozzle mounting with DMA/AF-HTC minimizes oscillatory flow due to eddy currents and fluid-induced oscillations.
Multiple nozzle configurations provide medium to large volumes of spray water to cool the steam to the desired temperature.
Forged construction is used to keep welded joints away from high stress areas.

Specifications

Valve Size: NPS 3, NPS 4
Pressure Rating: ANSI CL150 to 2500
End Connection Styles: RF flanged, butt-welded, RTJ
Material: carbon steel, stainless steel, chrome-molybdenum alloy steel (F22, F91)
Maximum CV:15
Other configurations: Contact us for more information.

Applications

The most common applications include boiler interstage thermoregulation where the desuperheater is exposed to high thermal cycling and stress, and vibration caused by high steam velocities and flows. In addition to this specific application, the DMA-AF-HTC is also suitable for other severe cooling applications.
Power industry: auxiliary steam, HRSG interstage cooling, HP/RH thermostat spray
Process Control: Pressure Reducing Stations, High Pressure to Low Pressure Relief, Process Steam Relief, Vent Steam Relief, Auxiliary Steam.