Desuperheaters for Package and Industrial Boilers

The SPAD is a small-pipe attemperator with a fixed-nozzle spray-ring design that clamps between two steam pipe flanges. The LPD is a large-pipe, probe-type desuperheater with a variable-nozzle, fully actuated control valve and 90-degree flanged insertion. B-Tech Valve positions the SPAD for smaller steam pipes and the LPD for pipes six inches and larger.

These desuperheaters are used in power plants and process plants, including industrial boiler and cogeneration steam systems. Applications include increasing steam heat-transfer capability, protecting piping and steam traps, protecting rotating seals, increasing steam flow, decreasing boiler loads and reducing fuel costs where the system design supports those objectives.

The SPAD and Steam Attemperator designs are fed water from a separate temperature control valve. This arrangement supplies the spray-ring desuperheater with the water needed for steam temperature conditioning. Final selection and application sizing should account for the steam system, operating conditions, piping arrangement and required control strategy.

The listed desuperheater products are available in ASME B16.34 pressure classes 150, 300, 600, 900, 1500, 2500 and 2700. The suitable pressure class should be selected against the system design requirements and specified application conditions. B-Tech Valve can discuss the appropriate configuration from the project information supplied.

The listed SPAD, Steam Attemperator and LPD products are temperature rated up to 1,200°F (650°C). Actual application suitability still depends on the complete steam-system conditions, selected configuration, pressure class and installation arrangement. Providing operating details helps B-Tech Valve evaluate the appropriate desuperheater design.

Selection should begin with the steam pipe size, installation arrangement, pressure class, temperature conditions and desired control method. The SPAD uses a fixed spray-ring design, while the LPD uses a variable-nozzle probe design for pipes six inches and larger. B-Tech Valve sizes products for individual applications and can review the available system information.