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Custom Steam Desuperheater

Custom Desuperheater

Desuperheater – Unlike conventional desuperheaters, Komax uses a multiple-stage mixing system using the patented Komax Equalizer Mixing Module. The first stage of mixing occurs at the water injection point; the water is sprayed upstream of the flow using low-pressure full cone spray nozzles to adequately distribute the water across the cross-section. Small droplets are sheared to then even smaller sizes using the velocity from the steam blowing the sprayed water downstream toward the Equalizer. The second stage of mixing occurs at the Equalizer. The equalizer consists of 6 mixing chambers with a helical mixing element in each chamber, which leads to 12 divisions and instances of increased turbulence between the steam and water. Thus, further shearing the water droplets to be effectively absorbed into the steam line. The third and last stage of mixing occurs at the Equalizer outlet. This is where the 12 streams recombine to blend together and then complete the mixing and water absorption to be carried downstream to the next part of your process.

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Typical Applications

Product Benefits

The Desuperheater Creates Less Stress on Piping

Because of these mixing processes, we are able to significantly reduce the downstream requirements from approximately 30 pipe diameters to 10 pipe diameters before the temperature probe. The quick absorption of the water into the steam also greatly reduces the risk of stress in the piping due to thermal cycling, as water will not pool on the bottom of the pipeline. This removes the need for expensive thermal liners in the Komax Desuperheater, however, liners can be included in the design if desired.

Technical Specifications and 
Available Options for the Multi-Stage Mixing System

End Connection Options

  • Flanged Ends: Flanged end connections allow for significantly easy mounting of the desuperheater into the process pipeline. As a general standard, metal desuperheaters have raised face flanges per ASME B16.5 or ASME B16.47 (for sizes larger than 24”) standards. Komax can also fabricate mixers to contain DIN (metric) flanges as well.
  • Threaded Ends: Komax Systems offers male and female NPT end connections on desuperheaters as required.
  • Weld Prep Ends: For custom configuration, Komax Systems offers weld prep end connections on Desuperheaters.

*All desuperheaters are made specifically per customer specification; end connection type can be made specifically per customer request.

Call Komax System Inc for more information at (800) 826-0760.

Available Materials and Sizes

  • Diameter: 2” – 48” (for sizes above 16”, contact Komax Systems for more information)
  • Standard Metals: Stainless Steel, Carbon Steel, Chrome Moly (P11/P22/P91)
  • Exotic Metals: Hastelloy, Inconel, Monel, Alloy 20,
  • Pipe Schedule: Schedule 10 – XXS

Desuperheater Sizing Table

Line Size Port Size* Equalizer Size Overall Length Shipping Wt. in LBS
L1** L2** L3** 150# 300# 600#
2″ 1/2″ 2″ 12″ 4″ 4″ 15 17 21
3″ 1″ 3″ 12″ 5″ 5″ 19 20 26
4″ 1″ 4″ 14″ 6″ 7″ 35 33 49
6″ 1″ 6″ 18″ 8″ 8″ 53 60 94
8″ 1″ 8″ 20″ 8″ 9″ 96 109 187
10″ 1″ 10″ 24″ 10″ 10″ 174 187 293
12″ 1 12″ 29″ 10″ 13″ 298 352 482
14″ 1″ 14″ 33″ 12″ 14″ 400 440 610
16″ 1″ 16″ 36″ 15″ 16″ 650 884 1124
*Port size may change based on customer requirements.
**Lengths may change based on connection type or customer requirement

Additional Product Details

Using three stages of mixing, including our patented Equalizer™ mixing module within the desuperheater. Cooling happens almost instantly as it exits the mixing module, thus it doesn’t require the extensive downstream pipe lay length required by old-school designs. In fact, it needs less space, delivers more accurate temperature control, and reduces or eliminates thermal cycling fatigue in your piping, ensuring improved safety, less wear, and downtime. This makes for quick and efficient absorption of water into the superheated steam line.
A desuperheater can be used downstream of a boiler to reduce the steam temperature prior to being distributed to a user or process. It can also be used upstream of a turbine to reduce the temperature of the steam for safer operation for power generation.
A desuperheater works by injecting a cold fluid (typically water) into a hot steam line to lower the temperature of the steam. The water that is injected typically is injected via a spray nozzle or in order to absorb into the steam line. Usually the water will be absorbed into the steam line within about 30 pipe diameters of length, but with the Komax Desuperheater, we can reduce this length to 10 diameters with the use of our Equalizer(r) Mixing Module. The Equalizer shears the water droplets that are introduced into the steam line into a fine mist so the water is absorbed into the steam almost instantaneously.  
Desuperheaters lower the temperature of (or attemperate) a superheated steam line using a cooling water source (typically a boiler feedwater (BFW)). The superheated steam or gas is directly in contact with the cooling water or fluid. Desuperheating immediately begins the process of evaporation and absorption into the steam line. Typically, enough water will inject into the line to bring the steam temperature down to around Saturation (+/- 10°F ). However, the desuperheaters can be used to more moderately attemperate the steam to a specified final temperature if desired. This is possible because Komax desuperheaters can operate with a turndown range of up to 20:1 with proper pressure control.

If your questions about our products are not answered here, get in touch with us for more information.

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Our Custom Product Process

Getting a Komax Systems product for your industrial process is simple! To get started, get in contact with us! Give us a call or submit a quote via our website to get your quote started. 

Once we receive your request and the information associated with your process one of our sales engineers will reach out to make sure we've got all of the information needed to properly develop your quote. With all the correct information, our sales engineers can populate a unique quote specific to your custom design and your process' needs. Once the quote is finalized it is then paired with a drawing mock-up of your unit to make sure the specifications are to your liking and perfect for your system. 

As soon as the quote and drawing are approved your unit is then off to fabrication. While your unit is being manufactured you are kept up to date on its progress and you will be notified once your new Komax Systems product is on its way to you!

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