SPECIFICATION
FOR
It
is the intent of these specifications to describe the minimum requirements for
a bottom diesel or propane fired, oil jacketed thermoplastic material heating
kettle, suitable for preheating material to be applied by thermoplastic
applicators.
KETTLE
SIZES:
|
Material Capacity (lbs.) |
Feed Height |
Exterior Diameter |
Min. BTU |
|
|
|
|
|
|
600 |
46” |
40” |
275,000
|
|
1500 |
59” |
40” |
290,000 |
|
2000 |
70” |
40” |
340,000 |
|
2500 |
72” |
42” |
375,000 |
Melting
Performance: The unit shall be capable
of melting two-thirds of its material capacity to a temperature exceeding 400
degrees F within 75 minutes of initial heating and shall be capable of
continuously melting material while traveling.
Material
Heating: Tank shall be a vertically
mounted, cylindrical barrel-shaped container with a 32” to 34” maximum interior
diameter with 3/16 inch thick walls and 3/8 inch thick bottom. The tank walls shall be oil jacketed. The exterior tank walls shall be 1/8 inch
thick with a 3/8 inch thick bottom and form a cavity having a minimum spacing
of 1 inch between vertical walls and 3 inches between bottom plates, which
shall be filled with high temperature heat transfer oil. Heating oil for the oil jacketed kettles
shall be manufacture’s standard. This
oil jacket shall not be under pressure.
Exterior
Design:
Shell: Shall be of 11 Ga. HR. Steel unitized
construction to maximize heat efficiency and conform to the National Fire
Protection Association Code 58. The
interior side of the insulation shall have 14 GA. HR. which shall surround the
heating tank directing the exhaust heat against the material heating tank and
away from insulation, to assure even heating.
There shall be a 3” NPT
coupling/plug “View Port” through skin into combustion chamber for
inspection of diesel fuel ignition system and combustion.
Ventilation
Stack: Expanded heat vapor shall be
exhausted through two 11-gauge rectangular (3”X12”) stacks located 180 degrees
opposite each other. Exhaust stacks
shall rise at least 12” to 18” above kettles. One 2 inch square flash tube
shall be located behind feed door, designed to exhaust fumes above operator
head with a water-proof door that closes and opens automatically.
Material
Feed Door: Shall be water-proof and
constructed at a 30 degree slope enabling user to securely insert material
without loss of product or danger of molten slippage. Its volume opening shall be 121 square
inches. The kettle shall be capable of
accepting either block or granulated thermoplastic material.
Material
Discharge Valve: A 3” knife gate type
material valve with trough shall rapidly discharge and securely close without
the need for auxiliary heating.
Gauges: Oil and material temperature gauges shall be
visible at the discharge valve end of the kettle, with readings up to 550
degrees F.
Top
Plate: The entire ¼” thick top HR. plate
of the preheating kettle shall be divided into two removable sections.
Transport
Rings: Top hoist rings or metal platform
shall be provided.
Heat
Shields: Solid heat protection panels 11
gauge thick shall be secured to the feed side of the kettle. The panels shall be constructed to have a 1
inch air flow space and shall have a 33 inch width dimension and cover from the
top edge of the kettle to approximately 24 inches from the floor. Heat shields shall be mounted around the
exhaust stacks.
Instruction: Shall be durably attached to the discharge
side of the kettle.
Material
Agitators: Upper and lower paddles shall
be mounted on a 1 ½ inch diameter shaft and connected with two vertical blades
½ inch thick wiping within ¼” inch of tank wall. The aforesaid paddles and a center paddle
shall be positioned to gently blend material homogeneously. The shaft and agitator shall be easily
removable from the melting kettle to facilitate cleaning. The shaft support mounts shall only be
located above the top plate of the kettle.
The agitator shall be driven by one hydraulic motor which shall be
offset chain sprocket mounted providing at least a 2:1 torque power ratio.
Agitator shall be locked in place by 2 - ¼” bolts drilled through agitator
shaft between the upper and lower bearing
Burner/Combustion
Chamber: Each kettle burner shall be 12
volt, single phase, and 5.8 amps. Diesel fired and provided with valves,
regulators, lines and all fittings necessary for operation when supplied from
the diesel tanks. The burner assembly
shall be mounted on a slide out tray for easy access and maintenance. The kettle shall have a Pyrolite shell
combustion chamber. The Pyrolite chamber
shall be inserted into a circular stainless steel mount. This chamber shall be 14” diameter X 12”
height X ¼” thick. Combustion chamber
shell must be replaceable. The
combustion chamber must be air tight.
The exhaust vents will be the only access to atmosphere. The only air access to the combustion chamber
shall be through the burner blower. No
fire brick type system is acceptable. A replaceable heat deflector shall be
used to protect bottom of kettle.
Safety
Systems: Kettles shall have both primary
and secondary burner/temperature control devices. The primary device shall be
an automatic temperature control to maintain heat transfer oil temperature at a
pre-set adjustable level in a range up to 550 degrees F. The secondary device is a high temperature
limit switch that when activated, this device will stop the 12 volt power to
the diesel burner fuel solenoid.
Hydraulic
System: The system shall include a
gear-type or pressure comp. hydraulic pump, incorporating a pressure relief
valve, hydraulic filter, a bi-directional hydraulic motor geared to rotate in
excess of 40 rpm, selector valve, adequate size reservoir with filter screen,
shut-off valve, oil temperature and level gauge and all necessary pipes, hoses
and fittings to complete the system in accordance with established hydraulic
standards. The selector valve shall be
positioned in close proximity to the kettle feed door. The valve shall be a four-way control valve
to operate a two-way hydraulic circuit from a single hydraulic source. The valve shall allow reversal of the
agitator. Controls shall have easy operator accessibility. Each chain drive shall have an adequate
removable covering to prevent accidents.
Engine: A diesel fueled, air cooled engine of at least
11hp to operate the hydraulic system shall be supplied. The engine shall be equipped with an air
cleaner, muffler, adjustable throttle, variable speed governor, alternator and
battery charged electric starter.
Paints: All exposed metal surfaces shall be primed
with a rust and heat preventative and finished in a high heat resistant white
paint.
Service
Representative: A qualified,
factory-authorized service representative shall be available to assure correct
use of the unit.
Manuals: Two copies of an Instruction Manual and parts
book for kettles and accessories shall be supplied. The Instruction Manual shall include proper
thermoplastic handling procedures.
General:
All
equipment catalogued as standard to be furnished and included in purchase price
of the unit.
When
delivered, the unit shall be completely assembled and ready to operate except
for diesel or propane fuel.
All
hoses supplied in assembling units described in these specifications shall have
temperature and PSI ratings in excess of maximum operating temperatures in
pressure fluids and materials being transferred.
The
component parts of the unit shall be of proper size and design to safely
operate with stresses imposed by maximum capacity operation. Only new models in current production, which
are catalogued by the manufacturer, and for which manufacturer’s published
literature and printed specification are available, will be considered. Current models may be modified to comply with
these specifications.