Heater Specs - First Thermal Heaters

Heater Specs - First Thermal Heaters
800-665-4251 / 502-962-2883 / FAX 502-244-4046
Items appearing in red are vendor data that is required with proposal.
1. Thermal Fluid Heater
The thermal fluid heater shall be a _______ (single or dual) liquid circuit helical coil type. The
heater shall be designed for forced circulation of thermal fluid through a helical coil system
fabricated from seamless pipe of sufficient heating surface to satisfy the heat input requirements.
The heater shall be designed and constructed in accordance with the applicable ASME Boiler and
Pressure Vessel Code Section VIII or Section I. The coil is to be enclosed in an insulated shell.
Observation ports, manway, connections for heater coil, combustion air blower, and burner shall
be provided.
1.1 Heat Exchange Coil:
1.1.1 Coil:
The heat exchange coil shall be a tangentially wound, helical coil constructed of SA-106B,
seamless Schedule 40 carbon steel pipe. The coil shall be designed, constructed, tested, and
inspected in accordance with ASME Code Section VIII Division I. The heat exchange coil shall
have an ASME Code rating of 300 PSIG @ 800°F. Rating calculations shall include a 0.100"
corrosion allowance and a 0.001" fouling factor. The coil shall receive an authorized National
Board inspection and a copy of the inspection report shall be furnished to the purchaser.
Hydrostatic test pressure shall not be less than 1.5 x M.A.W.P.
1.1.2 Construction:
The heat exchanger shall be constructed with expansion loops to allow for thermal expansion and
contraction without transmitting stress to the heater shell. The heat exchange coil assembly shall
include inlet and outlet manifolds with 300 PSIG, ANSI RFS flanged connections. The heater
vendor shall manufacture, inspect, and hydrostatically test at his own plant. The purchaser or
owner's agent may be present for the hydrostatic test.
1.1.3 Film Temperature:
The heat exchanger shall be specifically designed for the __________ GPM flow rate required to
yield a temperature differential of __________°F through the heater. Operating under these
nominal design conditions, the maximum film temperature, measured at the point of maximum
radiant flux, shall not exceed __________°F at the maximum rated heater output.
1.1.4 Maxmimum Allowable Flux Rates/Vendor Data:
A. Radiant Zone: __________ btu/ft.2/hr
B. Overall Average Radiant & Convection: ________ btu/ft.2/hr
1.1.5 Heat Exchanger Effective Surface Area (minimum/vendor proposed):
Note: No extended surface, such as fins or studs, shall be permitted in either radiant or convection
A. Radiant Zone: __________ ft.2
B. Convection: ________ ft.2
C. Total: ________ ft.2
1.1.6 Coil Supports:
The heat exchange coil shall be supported and positioned in the heater shell by stainless steel
supports and wear plates. All coil supports shall be in the heater convection section to minimize
their exposure to radiant zone temperatures. Coil supports shall allow unhindered thermal
expansion and contraction of the heat exchange coil.
1.1.7 Multiple Circuits:
The thermal fluid heater shall contain a maximum of two (2) liquid coil circuits. Dual circuit coils
shall be parallel rolled and designed to assure equal exposure to radiant and convection heat
transfer in both circuits. Vendor shall not average dissimilar fluid temperatures in the outlet
manifold. Where more than one (1) liquid circuit is employed in the heater, the manufacturer
shall furnish headers designed to provide equalized flow through each circuit for both heater inlet
and outlet.
1.2 Heater Shell:
1.2.1 Shell Construction:
The heat exchange coil shall be enclosed in an insulated shell constructed of SA-36 carbon steel
plate. Shell construction shall employ full diameter end plates and all heater joints shall be
welded or gasketed "gas tight" by high temperature ceramic fiber gaskets. The shell shall not
contain castable, brick, or gunnite refractory. The inside of the shell and bottom cap shall be
insulated with multiple overlapping layers of ceramic fiber blanket. The blanket shall be fixed to
the shell by welded stainless steel pins and retention clips. The clips shall be located on 9" centers
maximum. To resist high temperature gas erosion, the pins and clips shall be covered with high
temperature caulk and the entire blanket surface shall be coated with a high temperature rigidizer.
1.2.2 Horizontal Heater:
A. The heater shell shall have removable end plates flanged and bolted to provide access to the
heater coil for inspection and maintenance. The rear cover plate shall have three 1" union type
peepsights with Pyrex™ glass for viewing of the heat exchange coil, burner flame, and
combustion block. A complete view of the burner flame shall be provided to allow operators to
inspect pilot and main flame conditions and to visually check for flame impingement. One 24"
diameter access door, hinged and bolted, shall be provided in the rear cover to permit internal
inspection without removing the full diameter rear cover. The front end plate shall contain the
burner and burner support. One fused quartz peepsight shall be installed for viewing the burner
pilot and main flame at the burner. End plates shall be internally insulated with ceramic fiber
modular block or blanket.
B. SKID AND SADDLES: The heater shell, coil, burner, and controls shall be mounted on
structural steel saddles tied together by rugged steel channel skid rails. The combustion blower,
burner, and valve trains shall be located on a steel platform welded to the front of the heater skid
1.2.3 Vertical Heater:
A. LEGS AND SUPPORT STRUCTURE: The vertical heater shell and stack shall be elevated
a minimum of 84" above grade by structural steel legs which are an integral part of the vertical
heater support structure. The stack may also utilize independent support from grade level. No
other auxiliary heater supports, pilings, or guys shall be required. The burner shall be located
under the heater for vertical firing configuration and factory-furnished shell supports shall permit
full access to the burner and combustion valve trains for adjustment and maintenance.
B. TOP CAP: The heater shell shall have a full diameter removable top cap to allow access to
the heater coil for inspection and maintenance. The top cover shall have three 1½" union
peepsights with replaceable Pyrex™ glass and slide gates with stainless steel slides for viewing
the heater internal, burner flame, and heater radiant zone. The top cover shall be internally lined
with 6" of ceramic fiber modular block held in place by stainless steel pins welded to the heater
cover. The top cap flange joint shall be sealed with a ceramic fiber gasket. A 24" diameter, bolted
manway shall be provided to permit access to the heater radiant zone and burner.
C. BOTTOM CAP: The heater bottom cap shall contain the burner block, coil support ring,
stack and heater leg support structure. The bottom cap shall be insulated with modular block
ceramic fiber blanket. The hot face rating shall not be less than 2400°F.
D. STACK AND RAIN CAP: The heater shall be equipped with a __________" I.D. carbon
steel stack that shall extend 15 feet above the top of the heater. The stack shall be 100%
supported by the heater or grade-level support. No external support or guys shall be required. The
stack shall be complete with a rain cap and all fittings and connections required to allow EPA
emission testing. Stack and cap shall be designed to withstand 100 mph winds. Stack and cap
shall be finished to manufacturer's standard.
E. LADDERS AND LANDINGS: The heater manufacturer shall factory-install a ladder, cage,
any required intermediate landing, and top catwalk to allow access to the heater top. All
equipment shall meet OSHA standards.
1.2.4 Lifting Lugs:
Lifting lugs shall be provided on the heater to assist in rigging and installing the heater.
1.3 Relief Valve:
The inlet of the heater coil shall be equipped with a flanged nozzle for mounting the springloaded pressure-relieving safety valves in accordance with the ASME Code and as described
A. __________" inlet 300 PSIG, ANSI, RFS flanged, x __________" outlet.
B. __________" orifice.
C. Valve set pressure: __________ PSIG.
D. The valve shall be equipped with a non-annealing alloy spring. The valve shall be installed on
a __________" p.s. 300, ANSI, RFS flanged nozzle by the heater manufacturer on the heat
exchange coil inlet where an increase in pressure is first sensed. The valve shall be shipped loose
to minimize damage in transit. Field re-assembly shall be by others.
E. Valve sizing calculations shall be per the applicable ASME Code, Section VIII. A copy of the
valve sizing calculations shall be provided to the purchaser.
1.3.2 Rupture Disc:
The safety relief valve set shall include a full pipe size, reverse buckling, 316 stainless steel
rupture disc to protect the valve orifice. Rupture disc set shall include companion 300 PSIG, RFS
flanges, with safety head assembly, excess flow valve, nipple and tee, 0-300 PSIG safety pressure
gauge, and alloy studs and nuts.
1.4 Automatic Gas/Fuel Oil Burner Package:
1.4.1 Burner:
An industrial, forced-draft, packaged gas burner with integral combustion air blower shall be
supplied and installed as an integral part of the heater by the manufacturer. Burner shall be
designed for Low NOx emissions. Burner manufacturer shall be _____________, Model No.
1.4.2 Equipment Included:
The complete burner package shall include the following equipment all furnished, piped, wired,
assembled, and installed as an integral part of the automatic heater combustion system.
A. MAIN BURNER: Includes ignition assembly with ignition transformer, spark ignition rod
and high temperature ignition cable, peepsight, scanner, and integral combustion blower and
B. COMBUSTION BLOWER: Complete with sheet metal scroll, air inlet ring, reverse inclined
blade impeller wheel, and direct- connected _________ HP, _________ RPM, TEFC, 460/3/60,
high efficiency blower drive motor. Blower operation shall be proven with a differential pressure
switch furnished as an integral part of the heater vendor burner package. Should blower noise
level exceed __________ DbA, a blower silencer shall be furnished by the blower manufacturer
with a guarantee that the noise level will not exceed this limit. NOTE: Blower motor starter shall
be furnished as an integral part of the complete heater vendor package.
C. BURNER CONTROL MOTOR: A modulating, electric burner input control motor/operator
shall be furnished, mounted, wired, and mechanically connected to the fuel and combustion air
input control valves. Field adjustment of linkage shall be by others.
1.5 Heater Control Cabinet:
A local control cabinet shall be furnished and mounted on the heater and contains the following:
1.5.1 Heater Main "On-Off" Switch.
1.5.2 Flame Safety Reset Switch.
1.5.3 Four (4) Operating Mode Lights:
A. Power On.
B. Burner On.
C. Call For Heat.
D. Alarm.
1.5.4 Flame Safety Programmer:
The Flame Safety Programmer shall be a Honeywell #RM7840L with UV amplifier. Flame
programmer shall provide prepurge ignition, flame monitoring, and post purge as required by FM,
IRI, and NFPA. Control shall also contain a combustion fault finder to electronically assist
service and maintenance.
1.5.5 Temperature Controllers:
All temperature controllers shall be thermocouple, electronic solid state, PID type with digital
scale and set point.
1.5.6 Primary Indicating Liquid Temperature Controller:
The Primary Indicating Liquid Temperature Controller shall be an automatic, indicating, electric
thermal liquid outlet temperature controller, installed in the heater control cabinet. The control
shall be adjustable type set point and indication shall be digital readout type. Scale range shall be
0-800°F. NOTE: Temperature element with well shall be installed in the flash tank.
1.5.7 Secondary Temperature Controller:
When the system heat load requirement falls below the burner modulating input turn- down
range, a secondary temperature switch shall automatically take over burner control and operate
the burner in an "On/Off" mode until system demand rises above the minimum firing level of the
burner. Sequencing from modulating mode to "On/Off" mode and back shall be automatic, not
requiring operator monitoring.
1.5.8 High Thermal Liquid Temperature Switch (IRI and FM Required):
Mounted in the heater control cabinet shall be a high thermal liquid temperature limit switch. This
limit shall be indicating, electric, with adjustable set point and 0-800°F scale range. The switch
shall be wired to shut down the burner and power down the control circuit should the thermal
liquid outlet temperature exceed the preset limit. Set point and read out shall be digital.
1.5.9 High Stack Temperature Switch (IRI and FM Required):
Mounted in the heater control cabinet shall be an adjustable, indicating, high stack temperature
limit switch. Switch shall be wired to shut down burner and energize heater alarm and shut down
circuit should preset temperature limit be exceed. High stack temperature shall shut down the
heater. Control shall have both digital set point and readout dial with 0-1200°F scale.
1.5.10 Fault Annunciator System LED Type:
The control cabinet shall be equipped with a "First Out" Fault Annunciator which shall detect
which safety or operating interlocks are not closed during burner start-up as well as which
interlock opens first to cause burner shutdown. If more than one interlock opens, the annunciator
shall alert the first one, and when that fault is corrected, it shall alert the second, third, fourth, etc.
Annunciator utilizes solid state electronics for reliability and optical couplers for visualization.
1.5.11 Alarm Horn:
An alarm horn shall be provided, installed, and wired to sound on activation of the
heater/combustion safety shutdown devices. These devices shall include:
1. Flame Failure.
2. Low Fuel Pressure.
3. High Fuel Pressure.
4. Low Combustion Air Pressure.
5. Low Thermal Liquid Flow.
6. High Thermal Liquid Temperature.
7. High Stack Temperature.
8. Low Thermal Liquid Level in Expansion Tank.
1.5.12 Common Alarm Contacts:
A set of dry contacts common to all of the heater safety limit devices shall be provided on the
cabinet terminal strip for use by the owner for remote indication of a heater safety problem.
1.6 Control Panel Board:
A steel instrument board shall be mounted on the heater so as to provide support for the gauges
and switches.
1.6.1 Differential Pressure Gauge:
A Differential Pressure Gauge with an isolating stop and bleed valve for liquid circuit shall be
included to provide the operator with a visual check of the pressure drop through the heater i.e.,
fluid flow.
1.6.2 Low Thermal Liquid Flow Protection For Liquid Circuit:
A differential pressure switch shall be installed, mounted, and wired as an integral part of the
safety system. This switch shall monitor the flow of thermal liquid through the heater. Should the
differential pressure drop below the set point, the heater will be shut down and the low-flow
alarm initiated.
1.7 Miscellaneous Heater Specifications:
1.7.1 Heat Transfer Surface:
The heater shall have not less than _____ ft² of fireside heat transfer surface.
1.7.2 Heater Liquid Fill Volume:
Vendor to state heater liquid fill in US gallons.
1.7.3 Weights and Measures:
Vendor shall state unit dry and operating weights and overall dimensions in initial proposal.
1.7.4 Heater Performance Data:
The heater manufacturer shall submit a HEATER PERFORMANCE DATA SHEET with the
initial equipment proposal. Performance data to be supplied shall include, but not limited to, the
1. Heater Net (LHV) efficiency at 100% of rated capacity __________%.
2. Fluid Film Temperature at 100% of rated heater capacity __________°F.
3. Maximum heat exchange coil metal temperature at 100% of rated heater capacity
4. Maximum radiant flux rate at 100% design capacity __________ BTU/Hour/°F/ft2.
5. Stack temperature at 100% rated heater capacity __________°F.
6. Maximum heater pressure drop calculated for the __________ GPM flow at
__________°F heater operating temperature __________ PSIG.
2.0 Expansion Tank
The heater manufacturer shall design, fabricate, and furnish an expansion tank of sufficient
volume to contain the liquid expansion from the entire thermal liquid system. The liquid level in
the expansion tank shall not exceed 75% of the tank volume when the system is operating at the
specified design temperature.
The expansion tank shall be designed, manufactured, and tested in accordance with the ASME
Code Section VIII, be inspected and approved by an authorized National Board inspector and
display the ASME Code stamping. Thank design pressure shall be 150 PSIG at 750°F. All tank
connections shall be 300 PSIG, ANSI, RFS flanged.
The expansion tank shall be arranged horizontally and have two bottom connections to the main
circulating loop to permit flow-through operation. The two bottom nozzles shall not be smaller
than the circulating pump suction.
The expansion tank set shall include:
2.3.1 Structural Steel Saddles:
The Structural Steel Saddles shall include center web plates. The saddles shall elevate the bottom
of the tank a minimum of 24" from the bottom of the saddle.
2.3.2 Level Gauge:
The Level Gauge shall be an armored reflex gauge with integral ball check gauge cocks.
2.3.3 Low Liquid Level Switch (Required by IRI and FM):
The Low Liquid Level Switch shall be wired to shut down burner and sound alarm upon low
expansion tank liquid level.
2.3.4 Inert Atmosphere Blanket System:
The Inert Atmosphere Blanket System shall maintain a blanket pressure that is a minimum of 10
PSIG in the tank. NOTE: If vaporizing type fluid is specified, the atmosphere pressure must be
maintained at a minimum of 10 PSIG above the fluid vapor pressure.
1. The inert blanket system shall be designed for 150 PSIG atmosphere supply pressure.
2. The inert blanket system shall include, as a minimum, the following:
1. Inlet stop valve.
2. Inlet pressure regulator, field adjustable.
3. Check valve.
4. Pressure gauge.
5. Outlet pressure relief regulator, field adjustable.
2.3.5 Tank Connections:
1. Two (2) __________" bottom connections.
2. Two (2) reflex level gauge connections.
3. One (1) 1" inert atmosphere blanket connection.
4. One (1) __________" top fill connection.
5. 3" low liquid level switch connection.
6. 1" vent connection.
The expansion tank shall include lifting lugs capable of lifting the entire flooded weight of the
tank and accessory equipment. The lifting lugs shall be located in the top center line of the tank.
The expansion tank volume shall be based upon a jobsite thermal liquid fill of __________ U.S.
gallons, not including the vendor's heating system liquid fill. The vendor shall state the tank
volume and heater liquid fill in the initial proposal.
The expansion tank shall be installed and piped as an integral part of the complete vendor
furnished thermal liquid heating system. The tank piping shall include two (2) risers piped to the
circulating pump suction and shall include a gate valve installed between the two tank risers and
other isolation valves as required by system proposed by the vendor.
3.0 Duplex Circulating Pump Set
The heater package shall be equipped with a circulating pump set designed to provide the thermal
flow and pressure required by the complete thermal liquid system. The pump set shall include one
(1) primary and one (1) stand-by pump with inlet and outlet manifolds and instruments mounted
and supported on a common fabricated base.
3.1 Circulating Pumps:
Duplex circulating pump set shall include two (2) cast steel high temperature centrifugal
centerline mounted, each complete with pump base, flexible coupling, steel OSHA type coupling
guard, mechanical seal, and electric motor. Pumps are to have a casing drain, inlet and outlet
nozzles drilled and tapped, all with steel plugs. Pumps may be air cooled or water cooled.
Pump shall be Series __________, Model No. __________, manufactured by __________.
Pump motors shall be __________ HP, __________ RPM, TEFC, 460 volt, 3 phase, 60 Hz.
Pump HP is to be calculated for non-overloading at full run out and maximum heater outlet
Pump capacity shall be __________ GPM at __________ ft. TDH (__________ PSIG). Vendor
shall submit a pump capacity curve marked with operating point and operating N.P.S.H.
3.2 Pump Suction Manifolds and Valves:
The vaporizer manufacturer shall furnish and assemble the suction and discharge thermal liquid
pump manifolds and install these manifolds on the pumps mounted on a common fabricated steel
base. Pump suction valving and pipe shall be at least one pipe size larger than pump suction
connection. All pump pipe and valve support shall be included as an integral part of the pump
skid package. Manifold pipe shall be schedule 40, SA106B, seamless carbon steel, welded and
pressure tested per ANSI B31.1. The use of flanged joints shall be held to a minimum. However,
where necessary, 300 PSIG, ANSI, RFS flanges with spiral wound mineral fiber gaskets and
alloy studs/nuts shall be used. Manifold connections larger the ½" shall be flanged. Connections
½" and smaller shall be 3000# couplings and seal welded.
3.2.1 Pump Piping Manifold:
Each pump discharge shall have one (1) flexible welded metal bellows hose with double stainless
steel braid, one (1) check valve, one (1) cast steel gate valve, and one (1) pressure gauge (4½"
dial x ½" n.p.t. gauge with stainless steel trim and bourdon tube and steel gauge block valve).
The two (2) pump discharge trains shall be piped to one (1) common header. The common
discharge header shall be factory piped to the heater inlet.
3.2.2 Pump Suction Manifold:
Each pump suction train shall include one (1) flexible welded metal bellows hose with double
stainless steel braid, one (1) strainer, and one (1) cast steel gate valve.
The two (2) pump suction trains shall be connected to one (1) common inlet header containing a
5" dial bimetallic type thermometer and well and a flanged _____" connection with cast steel
block valve for connection to the owner's liquid return. The pump suction header is to be piped to
the expansion tank liquid return connection by the heater manufacturer.
4.0 Vendor Data to be Included in the Proposal:
The vendor shall include with his proposal the following data:
A complete description of all items to be furnished, including:
1. Horsepower of all motors.
2. Electric power consumption.
3. Maximum fuel input.
4. Cooling water flow rates.
5. Thermal liquid system fill requirement.
6. Unit and total system weights and measures.
7. Catalog brochures and data sheets for all components included in the proposal.
8. Computer analysis of heater operating at maximum design capacity. Analysis shall show
gross fuel input, maximum calculated metal and fluid film temperature, calculated
combustion loading, and radiant flux rates.
9. Proposal sketch showing overall plan and side elevation dimensions and weights of
equipment proposed.
10. P&I sketch, illustrating the major components and instrumentation proposed and clearly
defining the battery limits of the equipment quoted.
11. Pump capacity curve/BHP calculations based upon non-overloading condition at system
design temperature.
12. Factory service rate sheet.
exceptions, or suggested alternatives to specifications, shall be clearly stated in the
vendor's initial equipment proposal. Where no exceptions or alternatives are stated, the
equipment will conform to this specification.
5.0 Documents to be Furnished With the Heater:
The successful bidder shall provide the purchaser with the following data and documents:
Three (3) copies of the following reproducible drawings and data:
1. Control wiring diagram
2. Piping and instrumentation diagram.
3. Instrument and valve legend, keyed to control wiring and piping and instrumentation
4. Heater system general arrangement drawing.
5. Heater start-up/shutdown sequence, including flame safety logic. All drawings shall be
CAD generated and suitable for use in the owner's master file. Symbols shall be ISA
standards. Weights and measures shall be shown in English units.
6. Manufacturer's data report and copy of ASME Code stamping for heater coil and
expansion tank.
7. Vendor shall provide purchaser with two (2) copies of a complete operating and general
instruction manual for the heater package.
8. Priced list of recommended spare parts.
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