Steam Injectors - SI20 | ADCA

ADCA ADCAMix SI20 – Steam Injector for Tanks

The ADCA SI20 is a direct steam injection device designed for heating stationary or circulating liquids in open tanks, basins, and process vessels. Steam enters axially, condenses primarily on internal plates, and is discharged into the liquid through multiple peripheral serrated openings at low velocity. This configuration supports efficient heat transfer and minimizes noise and vibration.

Technical Specifications

• Size: 3/4”
• Connections: Female thread ISO 7 Rp
• Models: SI20-4, SI20-5.5, SI20-7, SI20-8.5
• Installation: Horizontal or vertical orientation
• Max operating pressure: 8.5 bar
• Max operating temperature: 180 °C
• Main materials: AISI 304 / 1.4301, pin AISI 301 / 1.4310

Sizing and Selection

Selection is based on required saturated steam flow, inlet pressure to the injector, and pressure drop across the control valve or self-acting temperature regulator. The flow chart in the catalog refers to atmospheric tank pressure. For example, with a 950 kg/h load, available steam at 5 bar, and a 20% pressure drop (resulting in 4 bar at the injector), each SI20 delivers 293 kg/h; four units are required.

Typical Installation

Install the injector as low as possible in the tank, below the temperature sensor or thermostat. A vacuum breaker (VB21) is required between the injector and the control valve. If the steam line is below liquid level, a check valve is necessary to prevent backflow of liquid into the steam piping.

Control and Accessories

Standard arrangement includes an ADCATrol control valve with electro-pneumatic positioner, isolation valves, Y-type strainer, vacuum breaker, Pt100 sensor, process controller, and temperature indicator. Systems with vacuum breaker and self-acting temperature regulator are also available.

Applications and Limitations

Suitable for heating water and compatible process liquids where direct steam contact and condensate addition are acceptable. No moving parts, shut-off seat, actuator, or leakage class; modulation is achieved via upstream steam valve. Not recommended where isolation or zero leakage is required.