Low pressure steam generator, three pass reverse flame type, with efficiency from 91% up to 97% (1) according the installed smoke tubes (OR , HPO or HP type).
BAHR’UNO series is a family of packaged smoke tube type, low-pressure steam generators, three pass reverse flame, wet back.

It is dedsigned for a standard safety pressure up to 0.98 bar. The range includes models with a steam production capability from 140 to
4000 kg/h.

In compliance to the current laws, each steam boiler undergoes a conformity assessment, carried out by a Notified Body. The conformance to the essential safety requirements of European Directive 2014/68/UE (PED) of the body pressure vessel is guaranteed by the CE PED marking.

General features:
The flame inversion generator consists of a cylindrical furnace, with a wet bottom, in which the flame develops and where the inversion of the combustion gases takes place. The fumes then enter the tube bundle at the front tube plate and are conveyed towards the rear tube plate from which they exit through the smoke chamber.
The appliance is designed to ensure low heating loads in the combustion chamber and low superficial loads.

  • Boiler body: is made up of a cylindrical outer shell, a furnace with wet bottom and flat tube plates in quality steel, in compliance with current technical standards. 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 welding seams are carried out by qualified personnel in compliance to certified procedures and are subjected to Non-Destructive Tests, in accordance to an internal “Manufacturing and Control” program.
    Once the boilers have been manufactured they are subjected to hydraulic testing in accordance to the requirement 7.4 – Annex I, laid down in the Directive 2014/68/UE (PED).
  • The smoke pipes: making up the quality steel tube bundle are welded to the tube plates by means of qualified automatic procedures. Finally, the pipes are headed by counterbore eliminating the protrusions from the plate. The smoke pipes are equipped of turbulators or inserts according to the type of pipe used.
  • Front door: is made of welded steel sheet, internally lined with a layer of insulating material and a layer of high-thickness refractory material. It is mounted on hinges that allow it to be opened quickly and is equipped with a self-cleaning flame sight glass, suitably positioned to check the correctness of the combustion in operation. The burner attachment plate is bolted onto it and can be set up for the type of burner indicated by the customer.
  • Rear smoke chamber: made of welded steel sheet, it is fixed to the rear tube plate by means of bolts to allow removal. It is equipped with a suitable cleaning door and flue gas connection with horizontal axis (vertical on request), with a diameter suitable for the power of the generator. The smoke chamber is designed to house an integrated extractable economizer.
  • Base: it consists of a frame in steel sections, electro-welded to the tube plates and closed with welded steel sheets.
  • Service walkway: positioned on the top part of the generator, it consists of a steel section frame, covered with checkered plate on the walkway floor and completed, on request, by a parapet with handrail.
  • Insulation of the outer shell and the front upper part: the thermal insulation is obtained with a 100 mm thick rock wool mattress, bonded with high-density thermosetting resins, supported and covered externally by the 10/10 mm thick painted steel sheet casing. The front upper part of the generator is also insulated with rock wool covered externally by a metal box.

Composition of the standard supply: (2)

  • n. 1 steam outlet shut-off flow valve.
  • n. 1 weight-lever safety valve (3)
  • n. 2 reflective level indicators, with threaded connections and shut-off and drain valves.
  • Electric panel for automatic operation,
    IP55 400V-3+N-50Hz complete with:
    - n. 1 large dial pressure gauge with 3-way tap for calibration
    - n. 1 safety pressure switch with manual reset, homologation.
    CE PED approved
    - n. 1 limit pressure switch
    - n. 1 pressure switch for regulation of 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 on the control panel, CE certified
    - n. 2 water level probes for pump/s ON-OFF
  • n. 1 centrifugal electric pump for water loadin
  • Water loading line circuit with pipes and shut-off valve.
  • n. 1 group of water drain / sludge discharge with quick opening manual valve
  • Manhole with cover and two steel forged brackets
  • Moisture separator on the main steam outlet, for high-titer steam without dripping;
  • Turbulators (for OR version) or high efficiency inserts (for HPO & HP versions)
  • Documents envelope
  • Conformity of factory tested Assembly, according to B + D PED modules

- “Second boiler water feed pump” kit
- “Feed water inlet 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 versions

BAHR’UNO 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

(1) This value is intended with economizer and may change according working pressure and load conditions.
(2) The quantity, types and the model may vary according to the offered configuration.
(3) 2 safety valves for the models over 2000 kg/h. On the request spring operated safety valves.

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