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Water Boilers
Forced Draft - Gas, Oil, Gas/Oil
Form 2126 Rev 07/01/06 Repl 11/01/04 Page 1 of 2
The boiler shall be a Bryan Model ___________
flexible water tube water boiler, with a capacity of
______ BTU input and ______ BTU output.
(__________HP)
The boiler shall be constructed and assembled
as a completely packaged unit ready for field
connections to the water supply, return
connection, electrical power supply, fuel
supply(s), relief valve discharge, building
management controls and flue-gas vent.
The water boiler shall be manufactured in strict
accordance with ASME Heating Boiler Code,
Section IV, and shall bear the ASME “H”
stamp for maximum working pressure of 160
PSIG and 250
o
F temperature.
The boiler shall also be built to withstand 150
degree delta “T”.
(Also available for higher pressures up to 250
PSIG and temperatures to 300
o
F per ASME
Section I)
VESSEL AND TUBE CONSTRUCTION
The boiler shall be constructed on a heavy steel
frame. The boiler pressure vessel shall be
provided with adequately sized upper and lower
drums. A minimum of two downcomers shall be
provided and shall be located inside furnace
chamber to maximize proper thermal internal
water circulation. No external water circulation
source shall be required. Steel water tubes are to
be 1½” O.D., .095 wall thickness, six-pass,
flexible serpentine bend design, not subject to
thermal shock damage. Individual water tubes
shall be easily removable and replaceable without
either welding or rolling. The boiler shall have no
more than two tube configurations. The boiler
shall be furnished with an adequate number of
tappings and inspection openings to facilitate
internal boiler inspection and cleaning.
FURNACE/COMBUSTION CHAMBER
CONSTRUCTION
Access to the furnace/combustion chamber is
gained by a hinged access door(s) with an
opening of no less than 26" wide x 62" high
maximum to allow for inspection of the interior
chamber and the burner head. All remaining
panels shall be individually removable. All
access panels shall be affixed to the pressure
vessel frame and insulated with 2” mineral
fiber mono block and 2” high temperature
ceramic blanket insulation and be fully
gasketed for pressurized firing.
The furnace/combustion chamber shall be
primarily of water-wall design with one side of
removable panels. The stationary interior wall
shall be lined with 1” mineral fiber mono block and
1” ceramic blanket insulation. The front and rear
walls are insulated with 4” mineral fiber mono
block and 2” ceramic blanket. The floor beneath
the tubes shall be lined with 2” mineral fiber mono
block insulation and 2” ceramic blanket. The
boiler furnace/combustion chamber and flueways
shall be designed to operate at a positive 0.50”
w.c. at the boiler flue outlet. The boiler will require
a “positive pressure” type metal flue.
JACKET CONSTRUCTION
The boiler shall be complete with a metal jacket,
16 gauge, zinc-coated rust resistant steel casing,
finished with a suitable heat resisting paint and
shall be constructed on a structural steel frame
and properly insulated with no less than 1½”
fiberglass insulation. Complete jacket and
insulation shall be easily removable and
reinstalled. The boiler shall incorporate
individually removable jacket doors, with handles
providing easy access to combustion chamber
and access panels. The entire tube area shall
be easily accessible for fireside cleaning.
All appropriate controls where possible, shall
be mounted on boiler front.
A tube removal and replacement shall be
demonstrated at time of start-up. Demonstration
time not to exceed 40 minutes.
The boiler vessel shall be warranted for 25 years
against thermal shock on a non-pro-rated basis
.
(Continued on Page 2)