SECTION 15561

FIRE TUBE BOILERS

PART 1 GENERAL

SECTION INCLUDES

Boilers.

Controls and boiler trim.

Steam and condensate connections.

Hot water connections.

Fuel burning system and connection.

Chimney connection.

RELATED SECTIONS

Section 15170 - Motors.

Section 15517 - Hot Water Specialties

Section 15525 - Steam and Steam Condensate Specialties.

Section 15577 - Lined Prefabricated Chimneys and Breechings.

Section 15952 - Controls and Instrumentation.

Section 16180 - Equipment Wiring Systems.

REFERENCES

AGA - Directory of Certified Appliances and Accessories.

ANSI/AGA Z21.13 - Gas-Fired Low-Pressure Steam and Hot Water Boilers.

ANSI/AGA Z223.1 - National Fuel Gas Code.

ANSI/ASME SEC1 - Boiler and Pressure Vessels Code - Rules for Construction of Power Boilers.

ANSI/ASME SEC4 - Boiler and Pressure Vessels Code - Rules for Construction of Heating Boilers.

ANSI/ASME SEC8D - Boilers and Pressure Vessels Code -Rules for Construction of Pressure Vessels.

ANSI/NFPA 70 - National Electrical Code.

ANSI/UL 726 - Oil-Fired Boiler Assemblies.

HI (Hydronics Institute) - Testing and Rating Standard for Cast Iron and Steel Heating Boilers.

SUBMITTALS

Submit product data under provisions of Section [01300.] [01340.]

Submit product data indicating general assembly, components, controls, safety controls, and wiring diagrams, and service connections.

Submit manufacturer's installation instructions under provisions of Section [01300.] [01340.]

Submit manufacturer's certificate under provisions of Section [01400] [01405] that [products] [________] meet or exceed [specified requirements.] [____________________.]

Submit manufacturer's field reports under provisions of Section [01400.] [01405.]

Submit reports indicating condition and operation at start-up.

Submit test reports under provisions of Section [01400.] [01405.]

Submit reports indicating specified performance and efficiency is met or exceeded.

OPERATION AND MAINTENANCE DATA

Submit operation and maintenance data under provisions of Section [01700.] [01730.]

Include manufacturer's descriptive literature, operating instructions, cleaning procedures, replacement parts list, and maintenance and repair data.

QUALITY ASSURANCE

Manufacturer: Company specializing in manufacturing the products specified in this Section with minimum [three] [_____] years [documented] experience.

REGULATORY REQUIREMENTS

Conform to ANSI/ASME [SEC1] [SEC4] [and] [SEC8D] [and] [ANSI/AGA Z21.13 Code] [ANSI/UL 726] for construction of boilers.

Units: [AGA certified.] [UL labelled.]

Conform to [applicable] [ANSI/NFPA 70] code for internal wiring of factory wired equipment.

DELIVERY, STORAGE, AND HANDLING

Deliver products to site under provisions of Section [01600.] [01610.]

Store and protect products under provisions of Section [01600.] [01620.]

Protect boilers from damage by leaving factory inspection openings and shipping packaging in place until final installation.

WARRANTY

Provide [five] [_____] year [manufacturer's] warranty under provisions of Section [01700.] [01740.]

Warranty: Include coverage of [entire package] [refractory] [shell and tube assembly] [__________.]

EXTRA MATERIALS

Submit maintenance materials under provisions of Section [01700.] [01750.]

Provide wire brush and [one piece] [hinged] handle for tube cleaning.

PART 2 PRODUCTS

MANUFACTURERS

[___________________________________] Model [__________.]

[___________________________________] Model [__________.]

[___________________________________] Model [__________.]

Substitutions: Under provisions of Section [01600.] [01630.]

MANUFACTURED UNITS

Provide factory assembled, factory fire-tested, self-contained, readily transported unit ready for automatic operation except for connection of [water,] [steam,] fuel, electrical, and vent services.

Unit: Mount on integral structural steel frame base and include integral forced draft burner, burner controls, boiler trim, refractory, insulation and jacket.

BOILER SHELL

Construct applicable ANSI/ASME Boiler and Pressure Vessels Code for allowable working pressure of [30] [60] [125] [15] [150] [200] [____] psi ([200] [410] [860] [100] [1030] [1380] [_____] kPa) [water.] [steam.]

Provide two lifting eyes on top of boiler.

Hinged front and rear doors, gas tight, insulated, and secured with heavy duty cap screws and replaceable brass nuts.

Front and rear tube sheets and flue fully accessible for inspection and cleaning when doors are open.

Provide observation ports at each end of boiler.

Provide handholes and armholes for boiler inspection and cleaning.

Provide spring loaded relief door with asbestos gasket seat.

Insulate casing with readily removable, 2 inch (50 mm) thick glass fiber blanket insulation covered by sectional preformed sheet metal jacket. Boiler casing temperature not to exceed ambient room temperature by 18 degrees F (10 degrees C) maximum with surface air velocity of one foot per second (0.304 m/sec).

Factory paint boiler, base, and other components with hard finish silicone enamel.

Water entering hot water boiler thoroughly mixed with hot boiler water through jet induced circulation.

Provide thermometer, 3-1/2 inch (90 mm) diameter, black letters on white background, bi-metal type.

STEAM BOILER TRIM

Provide pressure gage, and ASME rated pressure relief valves.

Provide water column with cocks, gage glass set and blowdown valves for gage glass and column.

Provide low water cut-off with manual reset integral with water column to automatically prevent burner operation whenever boiler water falls below safe level.

Boiler condensate return pump control, integral with water column to automatically maintain water level by controlling pump operation. Provide minimum control range of [[___] inches ([___] mm.)] [[___] gallons ([___] L.)]

Operation pressure controller shall control burner to maintain steam pressure setting.

High limit pressure controller to control burner to prevent steam pressure from exceeding safe system pressure.

HOT WATER BOILER TRIM

Provide pressure gage and thermometer and ASME rated pressure relief valves.

Provide low water cut-off with manual reset to automatically prevent burner operation whenever boiler water falls below safe level.

Provide operating temperature controller to control burner operation to maintain boiler water temperature.

Limit temperature controller to control burner to prevent boiler water temperature from exceeding safe system water temperature.

Provide air vent tapping in boiler shell.

FUEL BURNING SYSTEM

General: Forced draft automatic burner integral with front head of boiler designed to burn [No. 2 oil.] [No. 5 oil.] [natural gas]. [No. 2 oil and natural gas.] Burner operation [on-off] [hi-low] [modulating] with low fire ignition position. Maintain fuel-air ratios automatically with flue gas temperature minimum 68 degrees F (38 degrees above dew point temperature of flue gases at boiler	outlet.

Oil Burner: Low pressure air atomizing forced draft type with electric ignition. Air atomizing system to include belt-drive compressor, lubricating oil tank, oil level indicator, inlet oil filter, and air pressure gage.

Gas Burner: Forced draft, high radiant annular entry, premix, power burner with gas-electric ignition and gas pressure regulator.

Combination Gas-Oil Burner: Burner for gas and light oil built as single unit, without need of interchanging. Gas burner and oil burner complete with gas pressure regulator.

Blower: Statically and dynamically balanced to supply combustion air. Equipment with inlet silencer and outlet air dampers. Direct connected to motor.

Oil Pump: Capacity approximately twice maximum burning rate.

Oil Burner Piping: Include oil pressure regulating devices, oil metering controls, solenoid shut-off valves, oil strainer and instrumentation, integrally mounted on unit and adequate to permit system adjustment for optimum performance.

Natural Gas Burner Piping: Include on unit complete gas train including pressure reducing valve or valves.

Drip Pan: Provide 24 x 24 x 2 inches (600 x 600 x 50 mm) deep, 16 gage (1.5 mm) galvanized steel soldered pan on floor under each oil burner.

CONTROL PANEL

Mount panel on boiler. Hinged metal cabinet with key lock shall contain programming relay, blower motor starter.

Program relay to control ignition, starting and stopping of burner and provide both pre-combustion purge and post combustion purge. Burner to shut down in event of ignition, pilot, or main flame failure. Interlock to shut down burner upon combustion air pressure drop.

Manual-automatic selector switch and damper motor positioning switch to permit automatic firing in accordance with load demand, or manual control of firing rate at any desired point between low fire and maximum rating.

Electronic detector to prevent primary fuel valves from opening until pilot flame is established.

Panel to include indicating lights to show operating conditions of low water level, flame failure, fuel valve open and load demand. Mount indicating lights and switches in hinged drop-panel for wiring to access.

Provide oil-gas selector switch.

PERFORMANCE

Minimum efficiency, [certified] [verified] by [factory] [and] [site] tests shall be minimum [76] [80] [___] percent from 30 to 100 percent of full load firing rate.

Provide [___] boilers for producing [steam] [hot water] each with gross input[___] Btu/hr ([___] W), gross output [___] Btu/hr ([___] W), at sea level.

DESIGN CRITERIA

Provide minimum of 5 sq ft (0.46 sq m) of fire side heating surface per rated boiler horsepower (Watt).

SOURCE QUALITY CONTROL

Provide factory tests to check construction, controls, and operation of unit. [Tests will be witnessed by Architect/Engineer at manufacturer's expense.]

Provide authorized boiler inspection prior to shipment and submit copy of inspection report to Architect/Engineer.

PART 3 EXECUTION

INSTALLATION

Install in accordance with manufacturer's instructions.

Provide for connection to electrical service. Refer to Section 16180.

Provide connection of gas service in accordance with ANSI/AGA Z223.1.

Pipe relief valves to nearest floor drain.

Mount thermometer in boiler breeching within 12 inches (300 mm) of flue nozzle. Refer to Section 15577.

MANUFACTURER'S FIELD SERVICES

Prepare and start systems under provisions of Section [01600.] [01650.]

Provide field representative for starting unit and training operator.

Provide combustion test and submit report. Test shall include boiler firing rate, overfire draft, gas flow rate, heat input, burner manifold gas pressure, percent carbon monoxide (CO), percent oxygen (0), percent excess air, flue gas temperature at outlet, ambient temperature, net stack temperature, percent stack loss, percent combustion efficiency, and heat output.

END OF SECTION