The SM Fire Tube Boilers are our high efficiency direct fired two pass dry back boilers. The burner fires down the center of the fire tube, which
is located either on the left or right side of the boiler. The flame travels down the fire tube and enters the inversion chamber. The
exhaust gases then travel from the inversion chamber through the combustion tubes and exit the boiler through the exhaust stack. The dry back design
refers to the use of refractory at the back of the boiler in the inversion chamber.
The SM Fire Tube Boilers is specifically designed to minimize the thermal stress on the boiler not only at high pressures, but at low pressures as well.
Cutting edge technologies are used to construct the fire tube boilers that help reduce the thermal stresses that occur when operating the boiler. In
addition, the fire tube boilers are designed with a large thermal inertia, allowing for fluctuations in steam production and is ideal for continuous
The SM has the opportunity to be supplied with a variety of forced draft burners, provided by some of the world’s leading burner manufactures. This allows
us to utilize a variety of fuels, meet stringent emissions requirements and even allow our customers the opportunity to select the burner of their
The SM-PA is our high efficiency option of the SM Fire Tube Boiler. The SM-PA is constructed in a horizontal orientation and is supplied with a combustion
air preheater at the burner side of the heater.
The SM-ECO is our feed water preheater option of the SM Fire Tube Boiler. The feed water preheater utilizes and economizer to preheat the water entering
the steam generator. This in turn, enables the customer to obtain optimum performance of the generator by supplying the necessary feed water temperatures
to the Fire Tube Boiler.
The BONO SM, SM-PA and SM-ECO Fire Tube Boilers are fabricated by our partner in Italy, BONO Energia and are available designed/constructed to various
local code requirements around the world. The most common codes are ASME with National Board registration for the United States, CRN for Canada and
CE/PED/TUV/DIN for Europe. Additional code requirements may be met if necessary.
Package and containerized systems are available for both the SM, SM-PA, and SM-ECO Fire Tube Boilers. These package systems can be customized to meet each
of our customers’ needs, including but not limited to: control panel, feed water pumps, feed water treatment, deaerators, feed water tanks, and ancillary
components. These auxiliary components are typically fabricated in the USA for USA/Canada installations.
Fire Tube Boilers In General
Fire tube boilers are a form of large water content boilers used to provide customers with steam as a heat transfer media. Typically, the quality of steam
provided by these units are much higher than forced circulation steam generators. The higher quality of steam mitigates the use of steam separators
or steam accumulators.