Carraro - Desuperheater VariFix

VARIfix DF Nozzle

VARIfix DF nozzles from Carraro are fixed-area spraying devices designed to deliver excellent atomization with minimal water droplet size, even at low differential pressures. Ideal for applications with near-constant loads, they offer reliable performance and moderate rangeability, while minimizing water impact against internal pipe walls.

The VARIfix gives you the following benefits:

Excellent atomization
Small droplet size
Handles load fluctuations
Minimized pipe impact.

For sales or commercial inquiries please contact us at marine@insatech.com.

Efficient and Versatile Steam Control

The VARIflow series desuperheaters are engineered to provide precise steam temperature control with exceptional water atomization and high rangeability.

Designed to fill the performance gap between basic mechanical sprays and more sophisticated, expensive devices, VARIflow desuperheaters offer flexibility through a wide variety of nozzle combinations.

The integrated diaphragm modulating actuator, typically assisted by a positioner, ensures full control of water flow during the desuperheating process, eliminating the need for an auxiliary control valve.

Suitable for applications with no practical limitations on steam temperature and pressure, VARIflow can handle water pressure differentials of up to 80 bar without requiring a supplementary reducing valve in most cases.

Key Features of the VARIfix DF Nozzle

The VARIfix has several benefits. See some of them listed below:

Fixed-area spray design: Available in single or multiple configurations for consistent spraying performance.
Sophisticated internal vortex ring: Ensures excellent atomization and small water droplet size, even at low differential pressures.
Handles moderate load fluctuations: Suitable for applications with nearly constant load, offering guaranteed rangeability to manage slight variations.
Narrow spray cone angle: Designed to minimize water impact on the internal pipe wall, ideal for probe-type installations.

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Solutions for Diverse Industries

The VARIfix are designed to deliver precise steam temperature control and efficient water atomization across a range of applications such as:

Process gases
Steam.

The various industries which the desuperheater is suitable for includes, but is not excluded to:

Marine
Oil & gas
General industry
Power.

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VARIfix DF Nozzles: Efficient and Reliable Spray Performance

VARIfix DF nozzles are fixed-area spraying devices, available in both single and multiple configurations, designed to deliver optimal atomization in a variety of applications.

Their advanced internal vortex ring ensures excellent atomization by creating small water droplets, even under low differential pressures, improving efficiency in steam and gas systems. These nozzles are particularly suited for processes with near-constant load requirements, while still offering the ability to handle moderate load fluctuations, thanks to their reliable rangeability.

Additionally, the nozzles are engineered with a narrow spray cone angle, reducing the risk of water impacting internal pipe walls. This makes them especially effective for probe-type installations, where precision and control are essential for maintaining system integrity.

VARIfix: Probe Assembly Design

The VARIfix desuperheaters feature a probe assembly where one or two nozzles are mounted at the end of a tubular extension, flanged to the pipe. The injection is positioned near the pipe axis, adjustable by the probe’s length for optimal performance.

A reference pin on the desuperheater flange ensures precise nozzle orientation inside the piping. The probe assembly is typically made from the same material as the pipe to ensure compatibility. Tables list the combinations of water and pipe connections based on nozzle dimensions, with steam connections capable of being oversized when two nozzles are used on the same probe (see it in the brochure here)

Best Practices for Efficient Desuperheating

To ensure efficient desuperheating, careful consideration must be given to the installation and arrangement of the desuperheater within the steam system. Proper placement enhances steam-water mixing and optimizes temperature control.

The key is to maintain ideal steam velocity at the injection point, as higher velocity improves turbulence and facilitates faster evaporation of water droplets.

Additionally, the location of temperature sensors, straight pipe runs, and nozzle orientation must be configured in line with engineering standards. These practices, illustrated in the accompanying figures, are critical to achieving optimal performance and precise temperature regulation in various desuperheating applications.

LEGENDA:
1) Pressure reducing valve
2) Water control valve
3) Carraro desuperheater
4) Temperature controller
5) Posiioner
6) Filter (recommended)

For technical questions

Martin Søvind Jensen

Tel: +45 2761 4502

Email: Martin.Sovind@insatech.com

Write to Martin

For commercial inquiries

Astrid Mihut

Tel.: +45 5537 2095

Email: Marine@insatech.com

Technical Specifications
Function	Temperature control of the overheated water
Size	Water: 1 ”and 1 1/2” Steam flange: 2 ”, 3” and 4 ” Steam line: 4 ”to 40”
Connection:	Flanger (ANSI)
Pressure step	Max ANSI 2500
CV	From 0.018 to 21.3
Material	Valve body: Alloy steel Nozzle head: Stainless steel (AISI 422)
Nozzles	15 different sizes
Rangeability	Up to 6: 1
Water volume	Max 21 m³ per. hour
Delta P	Min. 1.5 bar(g) Max. 30 bar(g)
Cooling	Max To 7 °C above the saturation point of the outlet vapor

Product specifications and manuals

Brochure - VariFix -Carraro
English | pdf

Download
Manual - VariFix - Carraro
English | pdf

Download

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