SPECIFICATIONS FOR NOVATHERM’S eVoTube PACKAGED FIRETUBE
HIGH PRESSURE STEAM BOILER
A. GENERAL DESCRIPTION
1. Supply, a quantity of ______ Steam Boiler(s) from Novatherm. Each steam boiler
shall be complete with all components and accessories, as indicated. Each
boiler unit shall be a Novatherm eVoTube Model _______ .
2. The capacity of each boiler unit is rated for a nominal output of _____ HP or
_____ lb/hr of saturated steam from and at 212 F. The operating pressure of the
boiler shall be ______ PSIG. The boiler design and construction shall be in
accordance with ASME Code, Section I, latest edition for power boilers
requirements, meeting a design pressure of 150 PSIG.
3. Each Packaged boiler shall meet the local codes and ordinances, including the
Canadian Registration Number (CRN) for the Province of operation.
4. Each unit shall be furnished as a packaged steam boiler, consisting of boiler,
burner, forced draft fan, controls, and accessories. Each unit shall be furnished
with required wiring and piping, and factory-assembled on a structural steel base
as a self-contained unit. The burner and boiler package must meet CSA
requirements for field approval.
B. BOILER DESIGN
1. Boiler shall be a ____ pass ____ back horizontal firetube type boiler with five (5)
square feet of heating surface per HP.
2. The boiler shall be completely preassembled and tested at the factory. The unit
shall be ready for immediate mounting on floor or simple foundation and ready for
attachment of water, fuel, electrical, vent and blowdown connections.
3. Pressure vessel shall provide for heavy metal thickness for increased boiler life
and have 0.375" thick shell, 0.5" thick tubesheet. Tube shall be of 2.5" outside
diameter and 12 gauge (0.105") of thickness
4. Tube must be free of any baffles or restrictions. Use of turbulators is strictly
forbidden
5. The boiler shall be furnished with eight (8) handholes in the boiler shell, one (1)
12"x16" manhole and two (2) plugged couplings at the bottom of the tubesheets.
6. A rear internal baffle door shall be provided at the rear of the boiler (for 3 pass
design) which must be independent off the rear door to prevent thermal stress
and expand the durability of the refractory
7. Front and rear doors shall be davited and are to be sealed with heat resistant
gaskets cables and fastened with a flanged connection. Doors shall allow for a
full access to the tubes from either the front or the back of the boiler.
8. Two (2) lifting lugs, located on top of the boiler, shall be provided to facilitate
installation.
Specifications for Novatherm’s eVoTube
Packaged Firetube High Pressure Steam Boiler
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9. The boiler shall be equipped with an integral, factory installed steam separation
system. The boiler shall produce a steam quality of 99,5%.
10. The exhaust gas connector shall be located at the front (for 2 and 4 pass
models) at the back (for 3 pass models) and be capable of supporting 2,000 lbs.
A stack thermometer coupling shall be provided on the stack connector.
11. Provide observation port at the rear of the boiler with a test port for testing of
furnace back pressure.
12. Unit shall be provided with minimum 2" thick mineral wool insulation. The boiler
shall be lagged with a 22 gauge thick steel jacket coated with enamel based
paint.
13. Furnace shall be plain circular type, the use of corrugated furnace is forbidden.
14. All boiler parts must be easy to procure in order to facilitate the maintenance of
the boiler. Use of proprietary parts shall not be allowed
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Special Optional High Efficiency Package (Model eVoFlexhe)
15. Boiler shall be supplied with an integral steaming natural circulation economizer
to reach an efficiency of 85% at 100%MCR with a minimum water inlet
temperature of 180 F at the normal operating pressure of the boiler.
16. The economizer shall be able to work without continuous feedwater by using the
natural circulation of the boiler.. The feedwater pumps could operate on an on/off
basis.
17. The economizer shall be made of carbon steel tubes and fins. The arrangement
of the economizer must prevent condensation of the flue gasses at all loads.
18. The economizer unit must be easily accessible by the rear of the unit and can be
easily removed and replaced or repaired.
19. The use of an external economizer shall not be allowed.
C. BOILER TRIM
1. Safety valves, size, and quantity, shall be in strict accordance with ASME Code
requirements.
2. Steam gauge, complete with siphon and cock, mounted on the boiler.
3. Water column shall be piped on boiler at factory, complete with gauge glass, and
drain valve. Gauge glass shall be shipped loose for field assembly to prevent
transport breakage.
4. Feed water pump control shall be piped and wired on boiler at the factory to
automatically activate feed water pump for makeup water. For model under 200
HP, pump control shall be of ON/Off type. Higher capacity, pump control shall be
of modulating type with a pneumatic feed water assembly piped on boiler at
factory complete with flow control valve, with bypass and isolating valves. A feed
water stop valve, a check valve and a strainer will complete the assembly.
Specifications for Novatherm’s eVoTube
Packaged Firetube High Pressure Steam Boiler
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5. Primary low water cut off shall be piped and wired on boiler at the factory to stop
burner operation when water falls below its set level.
6. Auxiliary low water cut off of the probe type shall be mounted and wired on the
boiler at the factory.
7. Operating steam pressure limit control with auto reset and excess steam
pressure limit control with manual reset shall be piped and wired on boiler at the
factory.
D. BURNER EQUIPMENT
1. Each boiler shall be supplied with a complete burner firing natural gas and/or
no.2 light oil. Burner shall be mounted, piped and wired to the boiler in factory as
a packaged unit. Burner shall be a PowerFlame.
2. The gas burner shall burn the specified quantity of fuel without objectionable
vibration, noise, or pulsation, with not more than 15% excess air and less than
100 ppm (corrected to 3% O2) CO in the products of combustion. In addition,
when firing gas, the burner shall be guaranteed to produce less than __ ppm
(corrected to 3% O2) NOx emissions.
3. The light oil burner shall burn the specified quantity of fuel without objectionable
vibration, noise, or pulsation, with not more than 15% excess air and a maximum
of No. 1 smoke spot, as measured on the Bacharach Scale.
4. Each burner shall guarantee to meet the emissions regulations. The use of flue
gas recirculation (FGR) is allowed to meet these regulations.
5. The burner is capable to operate automatically under Full Modulation and proven
low fire start. The burner modulation should be a minimum of 4:1 turndown on
Natural Gas.
6. Flame safeguard system shall be Honeywell RM 7800 Series installed and wired
at factory in a Nema-1A control cabinet.
7. The control cabinet shall include the blower motor starter and overload relay
along with numbered terminal blocks and colour coded wires
8. The control cabinet shall have mounted on panel the pilot lights for Power on,
fuel on and call for heat. A manual-auto firing rate selector switch shall be also
mounted on panel.
9. The burner shall include a manual firing potentiometer, to operate the boiler on
manual firing on cold start up.
10. The burner shall be equipped with an integral forced draft fan of the centrifugal
type, with a direct-connected ODP motor. Air flow shall be controlled by mean of
an air inlet damper. A minimum air flow switch shall be mounted on the fan
housing.
Specifications for Novatherm’s eVoTube
Packaged Firetube High Pressure Steam Boiler
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11. The burner shall be equipped with gas-electric ignition. The ignition system shall
be factory-mounted and consists of gas pilot, ignition transformer, pilot gas
regulator and pilot gas solenoid valve and pilot gas shutoff cock.
12. Burner air to fuel control mix can be furnished with either a linkage system or
optional linkage less system.
13. The boiler fuel train to include a gas regulator to accept a gas pressure of 5 psig
at the inlet of the regulator.
14. Main gas train, complete with one motorized gas valve, and, if required, one
main gas solenoid valve, gas metering valve, gas pressure regulator, two
lubricated gas cocks, high and low gas pressure interlocks, and proof-of-closure
switch.
15. Burner shall be equipped with a UV type flame scanner.
16. The oil burner shall be of the mechanical pressure atomizing type.
17. A two-stage oil pump shall be provided for each burner as an integral part of the
burner.
18. Two approved automatically operated safety shutoff valves shall be provided in
the oil supply line to the burner valves to be piped in series but wired parallel.
19. One oil pressure gauge is provided to indicate the discharge oil pump pressure.
E. CONTROLS
1. Each unit shall be equipped with necessary controls and safety devices to
operate automatically. The combustion safety control shall be of the electronic
type with timed programming sequences, and with safety lockout control in the
event of a flame failure. Safety lockout shall require manual reset before
automatic recycling can continue.
2. The burner control cabinet shall be mounted on the equipment supplied with a
key lock, and shall contain the necessary fuses, motor contactor and circuit
transformer. The control cabinet shall also contain the electronic flame safeguard
and programmer, control circuit switch, necessary switching relays and indicating
lights, all wired to a numbered terminal strip.
3. All electrical equipment, wiring devices and operating sequences shall meet CSA
requirements.
4. Power supply: ______ volts, 3 phases, 60 Hertz. Control voltage: 110 volts, 1
phase, 60 Hertz.
5. Pressure controls, for regulation and modulation of burner, shall be mounted on
the boiler and the sensing element shall be located adjacent to the boiler outlet.
6. The full modulation of the burner shall be limited by means of a pressure control.
7. An additional high limit safety pressure control of the manual reset type shall be
provided to control the burner.
Specifications for Novatherm’s eVoTube
Packaged Firetube High Pressure Steam Boiler
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F. TESTS
1. Boiler inspection shall include hydrostatic test in the presence of an Authorized
Inspector. He shall certify a data report which shall be delivered with the boiler as
evidence of ASME compliance. The boilers shall bear a registration number.
2. A factory electrical panel test shall be performed. An operational check shall be
evidenced on adjustment of controls and check of all safety devices.
G. EFFICIENCY
1. Each packaged boiler shall be adjusted on site to operate at a maximum
efficiency at all firing rates.
2. Predicted performances shall be provided by the manufacturer at the proposal
stage. Manufacturer must guarantee to meet or exceed the predicated
performances at 100% MCR or shall pay the owner 1% of the equipment
acquisition cost for each efficiency percentage bellow the predicted efficiency.
For the performances calculations, manufacturer must use the following
information:
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Elevation : _____ ft above sea level
Fuel type and high heating value : _______ BTU/lb
Boiler capacity at 100% MCR : _________ lb/hr
Operating pressure : ________ psig
Feedwater temperature : ____ F
Blowdown rate : ____ %
Excess air : _____ %
FGR : _____ %
3. The flue gas exit temperatures shall not fall below the dew point of the flue gases
to prevent condensation corrosion within the boiler.
H. WARRANTIES
1. Each packaged boiler shall be warranted against defects in workmanship and
material for a period of eighteen (18) months from date of shipment (or offer to
ship), or twelve (12) months from date of start-up, whichever occurs first.
2. The boiler pressure vessel shall be warranted against thermal stress cracking for
a period of twenty (20) years from date of shipment providing the boiler is
operated and maintained in accordance with the conditions specified in the
Owner's Manual. This warranty shall cover in full all leaks in headers and down
comers caused by any conditions other than corrosion, FOB manufacturer.
I.
START-UP AND SERVICE
1. Start-up and service of each packaged boiler shall be provided by experienced
and trained technicians or by regional authorized representative.
2. Provision shall be made for the start-up of each packaged boiler, as well as
instruction to owner's personnel concerning operation and maintenance.
Specifications for Novatherm’s eVoTube
Packaged Firetube High Pressure Steam Boiler
Page 5 of 6
3. The customer is to provide a chemical boil out compound to remove oil residue at
time of commissioning of the boiler.
4. The start-up and commissioning of the boilers will require a minimum of 8 – 10
hours to fully cure the refractory. The refractory curing procedure must follow the
manufacture procedure shown in the manufacturer manual.
5. Start-up reports, produced by the start-up technician, using the start-up form
found in the operating and maintenance manual shall be sent back to the
manufacturer for approval and warranty activation.
Specifications for Novatherm’s eVoTube
Packaged Firetube High Pressure Steam Boiler
Page 6 of 6