The SG Fire Tube Boilers are our direct fired two pass wet back boilers. The burner fires down the center of the fire tube, which is located on the lower
half 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 wet back design refers to water at the back of the boilers inversion
The SG Fire Tube Boilers are only available in a two pass design. A two pass design has a more balanced heat transfer from the tube to the water than a
three pass design. The optimized heat transfer lessens the thermal stresses on the structure and helps mitigate cracking or deformation. In addition,
the third pass of a three pass boiler has negligible heat transfer and has to potential to expose the tubes to corrosion (dew point).
The SG 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 SG-PA is our high efficiency option of the SG Fire Tube Boiler. The SG-PA is constructed in a horizontal orientation and is supplied with a combustion
air preheater at the burner side of the heater.
The SG-ECO is our feed water preheater option of the SG 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 SG, SG-PA and SG-ECO Fire Tube Boilers are designed and 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
Package and containerized systems are available for both the SG, SG-PA, and SG-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, deaerator, feed water tanks, ladders
and platforms 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.