UBW Boilers “UF Series”
Packaged Watertube Boilers
 (50 - 1200 BHP)

The UBW Boilers “UF Series” watertube boiler is a two drum system with multiple longitudinal gas passes separated by tangent water walls resulting in long turbulent gas travel without gas stratification.  The furnace is fully water-cooled on all four sides and heat absorption does not exceed 60,000 BTU per cubic foot of furnace volume.  Large downcomers are located outside the heat transfer zones to ensure positive, natural circulation without relying on external circulation pumps.  The boiler drums are independently supported by a structural steel frame to ensure that undue stress is not placed on the heat exchanger assembly.

The “UF Series” boilers heat exchangers consist of 0.105 wall ERW tubing (1-1/2” OD for size 1, 2  & 3 boilers; 2” OD for boilers size 4 and larger) bent in serpentine configuration to create multiple passes without the use of baffles.  This design ensures fast and uniform circulation throughout the boiler with excellent heat transfer.

The boiler is encased in a stress-free sealed insulated casing.  Pre-selected insulation and refractory are used to ensure low casing temperatures. The casing components are bolted together to provide easy access for maintenance. Access to the furnace is through a manway either at the front (small units) or at the rear (large units).  The boiler outer jacket is 16 gauge sheet steel finished with hard enamel paint.


The tube bends, which are necessary to provide the multiple gas passes, provide flexibility against expansion and contraction of the boiler which is associated with sudden temperature and pressure changes in the pressure vessel.  The pressure vessel is warranted against thermal shock damage for 20 years at temperature differentials up to 150°F.  Quick response to fluctuating loads and fast start-up capability use less fuel and manpower.  

The boiler, burner and controls are completely assembled and tested at our plant.  The package is built, inspected and tested in accordance with ASME Code and is registered with the National Board.  A certified test report is available, if required.  

When access to the boiler room is not possible with a Factory-assembled boiler, the boiler components can be crated and shipped for assembly on site.  A detailed assembly manual and tube installation tools are provided.  Trained Factory assistance is also available.  All boiler parts are ASME certified by a National Board Inspector.  The simple bolt design on the castings enables a qualified contractor to complete the assembly without ASME Code certified welders.

Dimensional Data:

UF Series Hot Water Boilers

UF Series Steam Boilers
   

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