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Mechanical Staging Burners

Mechanical Staging Burner

Nox Reduction Methods

During the last century, Nitrogen oxide emissions, called NOx, have constantly been increasing. Due to the destructive effects of nitrogen oxides on the health of

Industrial Furnace Burners

The «furnace industry» and products determine the type of flame contact. In many heat treatment processes, where the combustion gases must not come into contact

Mechanical Staging Burners

Raadman Mechanical Staging burners

The mechanical staging burners by raadman have a firing range from 1000 to 6200 kW, and they are manufactured by high quality electro-mechanical accessories which are easy to install and commission.

Thanks to the cam mechanism and butterfly valve, we have “Staging” operation in gas mode. In this type of burner, one actuator opens the damper and butterfly valve to reach the desired stages.

The components of these burners are as follows:

Mechanical components, burner head, flame tube, and cam mechanism, safety accessories, ignition devices, flame scanners, burner controllers such as Shokouh/Honeywell TMG or Siemens LFL, burner actuators, accessories of power system, ventilation motor, fan wheel, safety devices, and air pressure switches.

Firing Rate


Specification mechanical staging burner


  • Natural gas
  • Light oil (viscosity < 6 cSt)
  • Other types of fuels (such as heavy oil, LPG, etc.) requires written confirmation from the burner department of packman corporation (Raadman brand).


Raadman gas and dual fuel burners are suitable for the following utilization.

  • Installation on heat exchanger
  • Hot water boiler
  • Steam boiler and high-pressure hot water boiler
  • Hot air generator
  • Compatible with all types of combustion chambers according to EN303 standards.


The following methods of regulation are available for RGB-MC and RLGB-MC Series burners:

  • Oil: Two-stage operation
  • Gas: Two-stage progressive

Technical & Functional Features

  • Lightweight and optimized geometry.
  • High-quality heat-resistant steel material for all parts of burner head as well as flame covering accessories.
  • air damper for air flow setting and butterfly valve for regulating gas output controlled by a servomotor with variable cam.
  • Monoblock design and fully enclosed aluminum air housing.
  • Simple Installation, adjustment, and maintenance.
  • Easy access to internal components.
  • Engineered to maximize efficiency and fuel cost savings.
  • Suitable for firetube, firebox, and water tube boilers.
  • Equipped with high-quality and reliable electronic devices.
  • Up to 10-20 % flame shape control.
  • High-quality staging controllers from well-known producers.

Standard compliance

Designed in accordance with ISIRI-7595 and ISIRI-7594 Iran national standards (equal to the BS-EN676, and BS-EN267 European standards).

Permissible ambient conditions

  • Ambient temperature
  • -10 to +40 °C (14 to 104F)
  • -15 to +40 °C (5 to 104F)

Air humidity: max. 80 % relative humidity, no condensation.

The combustion air must be free of aggressive substances (halogens, chlorides, etc.) and impurities (dust, debris, vapors, etc.).


The emissions have been measured in various models at the maximum output, according to DIN-EN 676 and DIN-EN 297 standards.

The values of CO and NOx during burner operation are lower than 30 and 120 mg/kWh at 20 % excess of air for normal versions and, lower than 20 and 80 mg/kWh for Low NOx versions (LN series). Consequently, the burner’s NOx class of II and III is reported and being approved for normal version and LN Versions respectively.

Special notes

LN versions (Low Nox Burners) have a higher rate of mixing during their operation. This results in a further decrease in the flame length and an increase in the flame diameter.

Flame Dimension

The following diagram shows the flame diameters, which have a significant impact on the burner efficiency and their compliance with the boiler combustion chamber geometry.


The Raadman burners can be appropriately selected for all boilers which are designed according to the BS-2790, BS-855, EN-303, and BS-EN 12953-3. A flame should, at its highest output, fill 90% of combustion chambers.

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