Standard Features
SPRAY NOZZLES
Full cone non-clogging, polypropylene nozzles are specified with every standard Duall scrubber.

HIGH EFFICIENCY MASS TRANSFER
Duall’s standard media is corrosion-resistant molded polypropylene random dumped packing. Free space is a minimum of 93%, making for a maintenance-free low pressure
drop packing.
Several other types of packing may be used in custom designed scrubbers. Duall’s engineers select the best packing for a specific application.

INSPECTION DOORS
Inspection doors are standard for ease of inspection at all
critical points.

MIST ELIMINATOR
PVC Chevron blades are the core of the F Series fume scrubbers’ mist eliminator. Four (4) 30% air directional changes take place impinging droplets to the blades which then drain off. This results in less static pressure and makes the eliminator practically maintenance-free. Molded polypropylene packing is standard for PT and FW models.

RECIRCULATION PUMP Vertical sealless or end-suction horizontal corrosion-resistant pumps are specified, depending on the project requirements. Pump and motor are factory mounted.

Optional Features
CHEMICAL ADDITION CONTROL PACKAGE
The pH, ORP and conductivity control systems can be used with any new or existing scrubber installation. It will automatically regulate the addition of either acid or alkaline reagents to the scrubbing solution enhancing the removal of contaminants by the fume scrubber.

The pH control system consists of an enclosure, probe, a meter/analyzer and a chemical metering pump. It operates on 120 volts electrical power.
The probe is heavy-duty industrial grade. The probe comes with 10 feet of cable attachment to the analyzer.

The meter/analyzer has a weather-tight, corrosion resistant (NEMA 4X) enclosure. The analyzer is a state-of-the-art digital unit with one (1) 4-20 mA output for proportional control.

The metering pump delivers up to 5.5 gph and a maximum pressure of 150 psi.

The analyzer is housed in a corrosion-resistant, NEMA 4 enclosure that is fabricated from FRP. The panel is suitable
for wall mounting.

The internal components of the panel are prewired. A terminal strip is provided for attachment of power and control lines in the field.

SYSTEM MONITORING CONTROL PACKAGE
A monitoring package is available when monitoring of system “vital signs” is required by local regulatory agencies. Important parameters to be monitored would include air flow rate, recirculating liquid flow rate, pressure drop and solution chemistry.

MOTOR CONTROL PACKAGE
A motor starter panel with fused disconnect is available for start-stop motor control. Standard panel includes fan and recirculation pump control, based on 460 volt/3 Ph/60 Hz. power supply.

COMPLETE SYSTEM CONTROL PACKAGE
A system control package is available which combines all of the above functions, if applicable, into a single panel. Contaminant removal is achieved by adsorption of gases and vapors, condensation of condensable vapors and impaction of aerosols. All mechanisms occur in a packed bed for intimate gas-liquid contacting. Contaminants transferred to the liquid phase are removed from the scrubber by continuous or periodic overflow of blowdown.