Desuperheaters for Combined Cycle Plants

B-Tech Valve offers fixed-nozzle spray-ring designs and probe-type variable-nozzle designs. The SPAD Small Pipe Attemperator Desuperheater uses a fixed spray ring and flange clamp mounting. The LPD Large Pipe Desuperheater uses a fully actuated variable-nozzle control valve with 90° flanged insertion for steam pipes six inches and larger.

The SPAD uses a fixed spray-ring design that clamps between two steam pipe flanges. It receives feed water from a separate temperature control valve. This configuration is intended for smaller steam piping and is available in the pressure classes and temperature ratings specified for the application.

The LPD is designed for steam pipes six inches and larger. It combines a probe-type variable-nozzle, fully actuated control valve and desuperheater in one assembly, with flanged insertion at 90° on the steam pipe. It is American-made with domestic parts sourcing and is stocked for quick turnaround.

The listed products are available in ASME B16.34 pressure classes 150, 300, 600, 900, 1500, 2500, and 2700. The appropriate class is selected according to the customer’s steam system and design requirements. Application details should be provided for confirmation of the suitable configuration.

The listed desuperheater and attemperator products are temperature rated up to 1,200°F (650°C). Actual selection should consider the steam temperature, pressure, piping arrangement, control requirements, and downstream equipment protection objectives for the combined cycle plant.

Sizing is based on the steam pipe size, operating pressure and temperature, required steam temperature reduction, water supply, flow conditions, and installation arrangement. B-Tech Valve provides application-sized solutions, including SPAD designs for smaller piping and LPD designs for steam pipes six inches and larger.