Direct Steam Humidifiers - DSH | ADCA

ADCA DSH Direct Steam Injection Humidifiers

ADCA DSH units are direct steam injection humidifiers designed for ductwork and air handling units (AHUs). Steam is supplied through a filter, optional pressure reducing valve, and S16TSS steam separator before entering the injection tubes. This configuration minimizes condensate carryover into the supply air stream.

Technical Specifications

• Injection tube models: DSH10, DSH25, DSH30.
• Sizes: 1/2”, 1”, 1 1/4”.
• Material: stainless steel.
• Operating medium: saturated steam.
• Connections: ISO 7 Rp or NPT, optional flanged EN 1092-1 PN16 or ASME B16.5 Class 150.
• Injection tube rating: PN6, PMA 4 bar, TMA 152 °C.
• S16TSS separator: PN16, up to 16 bar at 50 °C or 12 bar for saturated steam at 250 °C.

System Selection

Selection is not based solely on diameter. Required data: humidification load (kg/h), steam pressure, inlet air temperature, inlet/outlet relative humidity, and duct dimensions. Absorption distance must be verified upstream of filters, fans, bends, or branches, as unabsorbed steam may condense on downstream surfaces.

Single-tube vs Multi-tube

Single-tube configuration is used when load and available absorption distance are sufficient. Multi-tube is selected for higher loads, large AHU cross-sections, or limited absorption distance, reducing velocity per injection point and improving mixing.

Control and Accessories

Flow is regulated by ADCATrol control valve with electric fail-safe actuator AVF or pneumatic actuator PA. Typical assembly includes S16TSS separator, filters, FLT/TSS22 steam traps, pressure reducing valve, pressure gauge, isolation valves, and check valve.

FAQ

Is plant steam suitable? Yes, but for hygienic applications or spaces with strict air quality requirements, clean steam (ADCAPure) is recommended.

Installation location? For horizontal or vertical ducts, with injection against airflow or upwards in vertical flow.