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WARNING: All installation procedures must be followed completely by a competent installer familiar with boilers
and boiler accessories.
CAUTION: Read and follow all instructions before installing any boiler equipment. All cover plates, enclosures
and guards must be maintained and in place at all times, except during maintenance and servicing.
A. Boiler Design
The Model WLF is a four pass carbon steel vertical boiler of
the waterleg tubeless design that includes an integral furnace
and extended conductive heat transfer surfaces. The furnace
is completely submerged within the normal operating water
level. In accordance with the latest edition of the ASME Code,
the boiler is constructed for either low pressure steam or high
pressure steam to 150 psi.
1.
Gas Flow
Heat transfer design of the Model WLF boiler provides
four pass flow to ensure maximum heated gas travel and
heat transfer. Refractory lined steel exhaust ports are
incorporated for heated gas flow direction from the
furnace to the finned convection surfaces. Symmetrical
finned design and layout provides equalized flow of heat
into each convection section from the furnace and
successive gas passes, ensuring high efficiency.
2. Water Circulation
Feedwater make-up and/or return enter the bottom of the
vessel below the steaming surface. By directing the
make-up into a non-steaming portion of the boiler, we
eliminate the possibility of collapsing steam bubbles and
thereby work in harmony with the natural water
circulating pattern within the boiler.
3. Tubeless
Boiler tubes are eliminated with the use of extended
finned heat transfer surfaces. These fins are seal welded
to the pressure vessel to enhance heat absorption into
the boiler water. Fouling, plugging, and replacement of
tubes are eliminated with the use of extended finned
surfaces.
4.
Furnace
The combustion chamber or furnace is centrally located
within the pressure vessel. It consists of a single
cylindrical tube attached to the top of the pressure vessel
with ASME Code required stay bolts. It is symmetrical in
layout and completely water backed, assuring a balanced
flow circulating pattern under all load conditions.
5.
Inner Casing
A non-metallic gas barrier encases the heat transfer fins,
to ensure proper gas travel from the combustion
chamber into each heat transfer zone. This barrier is
covered with a steel wrapper that is in turn covered with
a minimum 1-1/4" ceramic blanket, minimizing heat loss
General Description
and ensuring high fuel to steam efficiency. Blanket
density exceeds 8 pounds per cubic foot. The steel
inner wrapper ensures that the combustion byproducts
will not diffuse through the blanket insulation and into
the boiler room.
6. Outer Casing
The removable outer casing is fabricated of four 16
gauge octagonal steel panels. Each panel is painted by
a powder coating process on the inner and outer
surfaces, ensuring corrosion resistance and longevity.
Air space between the insulation and outer casing as
well as the extra thick inner insulation provides a jacket
temperature near ambient conditions.
7. Waterside Inspection
A minimum of two hand hole inspection plates are
provided in the pressure vessel near the bottom for
visual inspection and cleaning of the waterside
internals. One hand hole inspection plate is located on
the top of the boiler for additional waterside inspection.
8. Flame Observation Port
For visual inspection of the pilot and main flame ignition,
a sight port is provided in the burner housing.
9. Boiler Lifting Lugs
One lug for 1 O to 20 horsepower and two lugs on larger
units are provided to facilitate lifting and rigging the
boiler into place. The lug(s) is located on the top
centerline of the pressure vessel.
10. Boiler Base Frame
A structural steel welded base is provided upon which
the boiler is placed. The minimum height of the
structural base is 4 inches and the boiler is welded to
the base at four points.
B. Boiler Connections
The
following
accordance with the ASME:
1.
Steam Connection
The system supply connection is located on the top of
the boiler and is threaded as standard. In some
instances or for specific project requirements, the
nozzle connection may be flanged.
4
connections
are
factory
installed
in
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