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Duma Top Access Plenum

The Duma Top Access Plenum (DTAP) is a high-capacity tubular baghouse filter unit designed for demanding dust extraction applications. The DTAP system features vertically mounted filter bags (“socks”) with integrated snap-band fittings for secure, reliable installation.

Each filter bag is supported by an internal cage and mounted onto a cell plate, creating an effective seal between the clean air and dust-laden air chambers. For ease of maintenance, filter bags are accessible and removable from the top of the unit via dedicated access doors.

Safety handrails are fitted along the top platform, ensuring safe and convenient access during inspection and servicing.

A high-performance suction fan is installed at the base of the unit, drawing dust-laden air across the outer surface of the filter bags. Dust accumulation is automatically removed via an integrated reverse pulse cleaning system, ensuring continuous and efficient operation.

Collected dust is discharged through a hopper system and can be handled via:

  • Screw conveyors
  • Rotary valves
  • Collection bins

 

FILTER UNIT SIZES

Thanks to its modular design, the DTAP Filter Unit is available in a wide range of configurations to suit various applications:

  • Filter Area: 60 m² to 1037 m²
  • Airflow Capacity: 6,000 m³/hr to 109,000 m³/hr

Filter bag diameters and lengths can be customised based on customer requirements and site constraints. The modular construction also allows for easy transportation and installation.

FAN SPECIFICATIONS

Fans are mounted at the base of the filter unit and are engineered for optimal performance and energy efficiency.

  • Motor Power Range: 22 kW to 132 kW
  • Impeller Types: Backward curved or backward inclined

These high-efficiency impellers reduce energy consumption while maintaining superior airflow performance.

PRINCIPLE OF OPERATION

Dust-laden air enters the hopper section at the bottom of the filter unit and is drawn upward toward the clean air chamber.

As air passes through the filter media:

  • Fine dust particles are captured on the outer surface of the filter bags
  • Clean air passes through the bags and is discharged to atmosphere via the fan

To ensure uninterrupted operation, the filter bags are automatically cleaned using a reverse pulse jet system.

This process involves:

  • A short burst of high-pressure compressed air injected into the filter bags
  • Temporary reversal of airflow
  • Expansion of the filter bag to dislodge accumulated dust (“dust cake”)

The dislodged dust falls into the hopper below, where it is either stored or continuously discharged via a screw conveyor and/or rotary valve.

RETROFIT SOLUTIONS

Retrofit solutions are available for upgrading existing shaker-type bag filters.

The DTAP system’s top section, including the cell plate and pulse cleaning controls, can be integrated into existing units—significantly improving performance and efficiency.

These upgrades have been successfully implemented across various industries, particularly in the cement sector.

OPTIONS & ACCESSORIES

All models within the DTAP range are available with a comprehensive selection of optional features:

  • Explosion venting systems
  • High-temperature and specialty filter bags (anti-static, moisture-resistant, sticky dust applications)
  • ATEX-compliant configurations
  • Differential pressure (DP) controllers
  • Photohelic and Magnehelic gauges
  • Inlet and outlet headers
  • Circular ducting (various materials)
  • Extraction hoods
  • Motorized rotary or flap valves
  • Continuous screw conveyors
  • Maintenance platforms and access ladders
  • Fan isolating dampers (OBDs)

INDUSTRIES SERVED

The DTAP range is suitable for a wide variety of industries, including:

  • Cement
  • Food & Beverage
  • Agriculture
  • Tobacco
  • Pharmaceutical
  • Paints & Pigments
  • Mining
  • Foundries
  • Automotive
  • Pulp & Paper
  • Milling & Maize Processing
  • Woodworking
  • Rubber & Plastics
  • General Engineering

ADDITIONAL SERVICES

We also offer a range of support and maintenance services:

  • Inspections and preventative maintenance
  • Emission testing and reporting
  • Leakage detection
  • Off-site monitoring solutions

 

 
 

Controller Electric Specifications:

Electric Power:

  • 115 Vac ± 10% 50-60 Hz – 25 W
  • 230 Vac ± 10% 50-60 Hz – 25 W
  • 24 Vac ± 10% 50-60 Hz – 25 W (Optional)
  • 24 Vdc ± 10% – 25 W (Optional)

Selectable Output Voltage:

  • 24 Vdc
  • 24 Vac
  • 115 Vac
  • 230 Vac

Working Temperature:

  • From -10 °C to 60°C

 

Timer Specifications:

Pulse Time (Valve Opening)

  • From 50 msec to 5 sec

Pause Time (Interval Between Valve Openings):

  • 1 sec to 999 sec

SPECIFICATIONS Service: Air and non-combustible, compatible gases. (Natural Gas option available.)

Housing: Die cast aluminum case and bezel, with acrylic cover. (MP model has polycarbonate cover).

Accuracy: ±2% of full scale (±3% on – 0, -100 Pa, -125 Pa, 10MM and ±4% on -00, – 00N, -60 Pa, -6MM ranges), throughout range at 70°F (21.1°C).

Pressure Limits: -20˝ Hg to 15 psig.† (-0.677 bar to 1.034 bar); MP option: 35 psig (2.41 bar), HP option: 80 psig (5.52 bar).

Overpressure: Relief plug opens at approximately 25 psig (1.72 bar), standard gages only. The blowout plug is not used on models above 180 inches of water pressure, medium or high pressure models, or on gages which require an elastomer other than silicone for the diaphragm.

Temperature Limits: 20 to 140°F (-6.67 to 60°C). *Low temperature models available as special option. Size: 4˝ (101.6 mm) diameter dial face.

Mounting Orientation: Diaphragm in vertical position. Consult factory for other position orientations.

 Process Connections: 1/8˝ female NPT duplicate high and low pressure taps – one pair side and one pair back.

Weight: 1 lb 2 oz (510 g), MP & HP 2 lb 2 oz (963 g).

Agency Approvals: RoHS.

Turbo Valve Specs

Fluids: Non-lubricated filtered air

Operating temperature: Nitrile diaphragm -20°C; +80°C

                                                      Viton diaphragm -20°C; +200°C

                                                     Operating pressure Between 0.5 and 7.5 bar

Body and cover: Die-cast aluminum

Pilot unit: Stainless steel

Screws and bolts: Stainless steel

Coil insulation: Class H

Connector: PG 9 EN175301-803

Connector + coil protection: IP65 EN60529

Standard voltage: 24V/50-60Hz (±10%) 19VA

                                         115V/50-60Hz (±10%) 19VA

                                         230V/50-60Hz (±10%) 19VA

                                         24VDC (± 10%) 18 Watt