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Steam and superheated water boilers, firetube (shell) design

Our firetube boilers, for steam and superheated water production, deisgned, manufactured and tested according to the European Directive 97/23/EC, have been designed both for "heavy-duty" uses and energy saving through the use of the most up-dated technological solutions as well as the most advanced manufacturing systems.

  • three pass to enable the maximum exploitation of heat thus reaching high efficiency.
  • with reversal chamber totally immersed in water to widen the surface directly exposed to the flame,
  • no refractory material to cut off maintenance costs, the loss of heat through radiation and the overheating of the rear tube plate.
  • the boiler has a big water content and (for steam boilers) a wide evaporating surface, so granting a high thermal volume and the best steam quality.
  • the downwards firetube eccentricity, the symmetrical placing of the tube nest and the absence of any obstacle enable the intense circulation of water inside the boiler avoiding local overheating.
  • with big diameter, to enhance the heating exchange, the steam output and the efficiency, always observing the most severe environmental standards for flue exhausts,
  • downward eccentric firetube to obtain the maximum circulation of water inside the boiler and the steam chamber to an extent capable of meeting unexpected requirements at best,
  • Fox corrugated as a standard for boilers with ratings higher or equal to 10 t/h of steam or 7MW for superheated water, on request for lower ratings.
  • with rounded edges to uniformly absorb the expansion of the main body and the tube nest, functioning as real compensators, avoiding the risks of “breakage” typical of corner welded flat plates,
  • pressed and subjected to thermal normalisation treatment,
  • mechanical preparation of the edges to avoid thermically altering the areas to be welded, 
  • with expansion channels inside each opening corresponding to the smoke tubes, so that all the tubes perform the double function of stay rods and compensators,
  • the rear tube plate and the rear plate of the smoke reversal chamber are constrained by stay rods obtained from full round ASTM A105 bars diam. 50 (PB series). 
  • in the PB series boilers, the tubes are all exclusively expanded (with the sole exception of the tubes of the second pass of the smoke reversal chamber, where they are both expanded and welded), using the channels described previously.
  • trap-doors both in the front smoke chamber and the rear one for total and immediate accessibility to the smoke tubes and the tube plates (for cleaning, maintenance and ease of inspection on the part of the Authorities entrusted with periodic inspections),
  • absence of pipes in the lower part to facilitate cleaning of the water side,
  • large diameter cylindrical shell supplied with manhole, hand or man hole doors, intake pipes, couplings for auxiliary units and lifting eyebolts,
  • manhole for combustion chamber inspection, with flame detection hole (PB series).
  • electric panel using electronic components for maximum safety in functioning and to manage a heating plant with two or more generators in series,
  • fittings and components for control and safety to permit homologation for operation without the continuous supervision of operators 24-72 hours, in conformance with the regulations in force at the site of installation,
  • global control system for the plant and/or heating plant with multi-channel electronic control equipment or PLC.
  • On request it is possible to install an air preheater or an economizer, to increase thermal efficiency up to 95%.

Firetube Steam Boilers   Firetube Superheated   Firetube Hot Water   Thermal Fluid Heaters