BAHR'12 3G

High pressure monobloc steam generator, with 3 effective smoke passes, horizontal, efficiency 90% (1) for the OR version, 94% (1) for the HP version, and up to 96% (1) for the EC versions
Thanks to the large evaporating chamber optimally sized, the title of the saturated steam leaving the generator is of the highest quality

Standard safety pressure up to 12 bar (higher pressure available on request) and output from 800 to 4000 kg/h. With a large steam chamber and large evaporator for an high steam quality.

General characteristics:
The 3 effective smoke passes generator consists of a horizontal cylindrical furnace in which the flame develops, an inversion chamber, a first tube bundle (second pass) and a second tube bundle (third pass), to optimize heat exchange and emissions. Thanks to the large evaporating chamber, optimally sized, the title of the saturated steam leaving the generator is of the highest quality.
The appliance is sized to ensure low thermal loads and low polluting emissions (when equipped with Low NOx burner)

  • Boiler body: designed in compliance with the EN 12953-3: 2016 standard with set-in type tube plates, it is made up of cylindrical outer shell, furnace, inversion chamber and flat tube plates in quality steel, in compliance with current technical standards.
    The body is equipped with 2 still pipes diam. 100 mm for housing all safety and control devices.
    The materials used are accompanied by manufacturing certificates certifying the chemical and mechanical characteristics and the controls during the production cycle and therefore their suitability for use. The welds are carried out according to procedures approved by suitably qualified personnel and subjected, in accordance with an internal “Manufacturing and Control” plan to Non-Destructive Testing. Upon completion of manufacturing, each pressurized body is subjected to testing by carrying out the hydraulic test in accordance with requirement
    7.4 - Annex 7 of the PED Directive 2014/68 / EU
  • Smoke tubes: making up the quality steel tube bundle, are welded to the tube plates using qualified automatic procedures. Finally, the tubes are headed by counterbore eliminating the protrusions from the plate. They are equipped with helical turbulators (STD versions), or special Unical patented ESALU turbulator composed of a combination of aluminum inserts (HP).
  • Reversing chamber: built in welded steel sheet.
  • Front door: built in welded steel sheet, internally lined with layers of insulating and refractory cement. Mounted on hinges that allow a quick opening.
  • Rear smoke-box: built in welded steel sheet covered externally with a layer of insulating material.
    It is equipped with a pipe inspection and cleaning door, a horizontal axis flue gas connection (vertical on request) with a diameter suitable for the power of the generator.
    Prepared for connection to a removable internal economizer.
  • Basement: it consists of a frame made of steel sections, electro-welded to the tube plates and boxed by means of welded steel sheets.
  • Service walkway: located in the upper part of the generator, it consists of a steel profile frame, covered with checkered plate on the walkway floor and (on request) completed by a parapet with handrail and access ladder compliant with the EN ISO 14122 standard.
  • Insulation: the thermal insulation of the outer shell is obtained with a 100 mm thick rock wool mattress, bonded with high density thermosetting resins, supported and protected externally by a 10/10 mm thick painted sheet metal casing.

Composition of the standard supply: (2)

  • n. 1 steam outlet shut-off flow valve.
  • n. 2 spring-loaded safety valves.
  • n. 2 reflective level indicators, with flanged connections, shut-off and drain valves.
  • n. 1 large dial pressure gauge with 3-way tap for sample pressure gauge.
  • n. 1 safety pressure switch with manual reset from the electrical panel, CE PED certified.
  • n. 1 limit pressure switch.
  • n. 1 regulation pressure switch for two-stage burner (high / low flame) or pressure probe for modulating burners.
  • n. 2 low water level safety probes, with self-diagnosis, with manual reset from the control panel, CE certified.
  • n. 2 low water level safety probes, with self-diagnosis, with manual reset from the control panel, CE certified.
  • n. 1 vertical centrifugal pump for water loading
  • Water supply circuit with started flow shut-off valve, downstream of the pump, and disc check valve
  • n. 1 water drain / sludge discharge unit with quick opening manual valve.
  • Manhole 420x320 mm in the upper part and a DN150 inspection port in the lower part of the outer shell.
  • Moisture separator on the steam outlet, for a high titre steam
  • Blank burner plate (on request it can be drilled according to customer specifications)
  • Turbulators in steel, aluminum or steel + aluminum, depending on the model
  • Lifting eyebolts
  • Electrical panel board, IP55 400V - 3 + N - 50Hz
  • Standard documentation supplied

(1) This value is intended with an economizer and may vary according to the operating pressure and load.
(2) Quantities, types or models may vary according to the offered configuration.


- “Second boiler water feed pump” kit
- “Inlet water filter” kit
- EC kit: integrated economiser, extractable from the side (instrument side) to further increase the value the efficiency of the generator, without affecting the dimensions, equipped with connection pipes and downstream thermometer.
The EC economizer kit is specific to each model and is available for both, gas and diesel versions.
Upon request: pressure gauges upstream and downstream of the economizer, upstream thermometer, wafer type ball valves of shut-off and by-pass, safety valve.
- “Maximum level safety” kit
- “TDS” kit
- “Automatic bottom drain” kit
- Burner plate drilled according to burner requirements
- Burner

Special verions:

BAHR’12 3G 24 hr / 72 hr

  • equipped with dedicated panel and “24 hr KIT” to obtain the certification to operate “without continuous supervision” up to a maximum of 24 hours
  • equipped with dedicated panel and “72 hr KIT” to obtain certification to operate “without continuous supervision” up to a maximum of 72 hours

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