Section 15550 - Breechings, Chimneys and Stacks

SECTION 15550
BREECHINGS, CHIMNEYS AND STACKS
PART 1 - GENERAL
1.1
1.2
RELATED DOCUMENTS
A.
Drawings and general provisions of the Contract, including General and Supplementary
Conditions and Specification Sections, apply to this Section.
B.
Related Sections: The following Sections contain requirements that relate to this
Section:
1.
Section 15050 “Basic Mechanical Materials and Methods”.
2.
Section 15060 “Hangers and Supports”.
3.
Section 15074 “Vibration and Seismic Controls for HVAC Piping and Equipment”.
4.
Section 15512 “Cast Iron Boilers”.
5.
Section 15515 “Water Tube Boilers”.
6.
Division 16 Sections for power supply wiring from power source to vent fans.
SUMMARY
A.
1.3
1.4
This Section includes the following:
1.
Breechings and chimneys.
2.
Breechings and stacks.
3.
Flue vents.
SUBMITTALS
A.
General: Submit each item in this Article according to the Conditions of the Contract and
Specification Sections.
B.
Product data for each type of product specified. Include materials, dimensions, weights,
and accessories.
C.
Shop drawings detailing fabrication and installation of breechings and stacks, including
plans, elevations, sections, details of components, and attachments to other construction
elements. Detail connections to equipment.
D.
Welder certificates signed by Contractor certifying that welders comply with requirements
specified under the "Quality Control" Article.
E.
Engineering report certifying that stacks meet the design wind and seismic loads.
F.
Maintenance data for vent fans to include in the operation and maintenance manual.
QUALITY CONTROL
A.
Welder Qualifications: Certified according to AWS D9.1.
B.
Manufacturer Qualifications: Firm experienced in manufacturing breechings, chimneys,
and stacks similar to those indicated for this Project and that have a record of successful
in-service performance.
Clark County DOA Standard Specifications – 15550
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SECTION 15550
BREECHINGS, CHIMNEYS AND STACKS
C.
Comply with NFPA 211 for components and installation.
D.
Comply with SMACNA "HVAC Duct Construction Standards, Metal and Flexible" for
fabricated breechings.
E.
Comply with SMACNA "Guide for Steel Stack Design and Construction."
F.
Comply with AWS D1.1 for welder qualifications, welding details, and workmanship
standards.
G.
Comply with ASHRAE "Systems and Equipment Handbook," Chapter 31 for "Chimney,
Gas Vent, and Fireplace Systems," for material requirements and design criteria.
H.
Listing and Labeling: Provide products specified in this Section that are listed and
labeled.
1.
The Terms "Listed" and "Labeled": As defined in NFPA 211.
2.
Listing and Labeling Agency Qualifications: A "Nationally Recognized Testing
Laboratory" (NRTL) as defined in OSHA Regulation 1910.7.
I.
Single-Source Responsibility: Obtain all Type B vent system components from 1 source
and by a single manufacturer.
PART 2 - PRODUCTS
2.1
MANUFACTURERS
A.
Available Manufacturers: Subject to compliance with requirements, manufacturers
offering products that may be incorporated in the Work include, but are not limited to, the
following:
B.
Manufacturers: Subject to compliance with requirements, provide products by one of the
following:
1.
Type B Gas Vents:
a.
Selkirk Metalbestos
b.
MetalFab Inc.
c.
Van-Packer Co.
2.
Steel, Positive-Pressure, Double-Wall Vents:
a.
Selkirk Metalbestos
b.
MetalFab Inc.
c.
Van-Packer Co.
3.
Refractory-Lined Metal Breechings and Chimneys:
a.
Donlee Technologies Inc.; York-Shipley.
b.
Power-Pac Enterprises, Ltd.
c.
Simpson Dura-Vent.
d.
Van-Packer Co.
4.
Mechanical Draft Vent Fans:
a.
The Field Controls Co.
Clark County DOA Standard Specifications – 15550
Ver. 1.0
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September 5, 2005
SECTION 15550
BREECHINGS, CHIMNEYS AND STACKS
5.
2.2
2.3
b.
Metal Fab Inc.
c.
Selkirk Metalbestos.
d.
Teledyne Laars.
e.
Van-Packer Co.
Induced Draft Vent Fans:
a.
C.A. Litzler Co., Inc.; Quickdraft.
b.
Exhausto, Inc.
c.
The Field Controls Co.
d.
Metal Fab Inc.
e.
Selkirk Metalbestos.
f.
Tjernlund Products, Inc.
TYPE B GAS VENTS
A.
Description: Double-wall gas vents, conforming to NFPA 211, Type B. Inner pipe of
sheet aluminum, outer pipe of galvanized-steel sheet, each with the following minimum
thicknesses:
1.
Round, 6-Inch Inside Diameter and Smaller: 0.012-inch inner pipe, 0.0187-inch
outer pipe.
2.
Round, 7- to 18-Inch Inside Diameter: 0.014-inch inner pipe, 0.0187-inch outer
pipe.
3.
Round, 20- to 24-Inch Inside Diameter: 0.018-inch inner pipe, 0.0217-inch outer
pipe.
B.
Accessories: Tees, elbows, increasers, draft hood connectors, metal cap with bird
barrier, adjustable roof flashing, storm collar, support assembly, thimbles, firestop
spacers, and fasteners, fabricated of similar materials and designs as vent pipe straight
sections.
STEEL, POSITIVE-PRESSURE, DOUBLE-WALL VENTS
A.
Description: Double-wall metal stacks conforming to NFPA 211, suitable for use with
building heating equipment burning gas, solid, or liquid fuels.
B.
Construction: Inner and outer metal shells separated by at least 1-inch airspace, with
positive sealing joints.
C.
Inner Shell: Type 304 stainless steel of the following thickness:
1.
6- to 36-Inch Size: 0.035 inch thick.
2.
42- to 48-Inch Size: 0.048 inch thick.
D.
Outer Jacket: Aluminum-coated steel of the following thickness:
1.
6- to 24-Inch Size: 0.025 inch thick.
2.
26- to 48-Inch Size: 0.034 inch thick.
E.
Accessories: Tees, elbows, increasers, draft hood connectors, metal cap with bird
barrier, adjustable roof flashing, storm collar, support assembly, thimbles, firestop
spacers, and fasteners fabricated of similar materials and designs as vent pipe straight
sections.
Clark County DOA Standard Specifications – 15550
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September 5, 2005
SECTION 15550
BREECHINGS, CHIMNEYS AND STACKS
2.4
REFRACTORY-LINED METAL BREECHINGS AND CHIMNEYS
A.
Design Wind Loading: 150 mph.
B.
Design Seismic Loading: Zone 3.
C.
Chimney Outer Jacket: 0.0179-inch aluminized steel with riveted seams.
D.
Chimney Outer Jacket: 0.1233-inch galvanized steel with welded seam joint.
E.
Chimney Outer Jacket: 1/4-inch hot-rolled steel with welded seam joint.
F.
Breeching Outer Jacket: 0.1233-inch galvanized steel with welded seams.
G.
Refractory Lining: Tested to UL 959 for temperature and acid resistance, and bearing
the testing laboratory label.
1.
Temperature Rating: 1800 deg F continuous firing, and 2000 deg F intermittent
firing without fusion.
2.
Acid Extraction: Maximum of 0.2 percent.
3.
Cold Crushing Strength: Minimum of 3200 psi.
4.
Thickness: Minimum of 2 inches.
H.
Finishing: Factory-applied, high-heat-resistant paint; color as selected.
I.
Base Section:
foundation.
J.
Cleanout Section: Smoke-tight with gasketed and bolt-tightened inspection plate; weld
neck to stack section.
K.
Tee or Wye Section: Smoke-tight connection, with welded joints, refractory lining,
finished with smooth transition, and with no exposed metal on inside.
L.
Spark Screen: Type 304 stainless steel, 0.0625 inch, 1/2- by-1/2-inch mesh, with Type
304 stainless-steel rolled angle and drawband.
M.
Guy Bands: 8-inch-wide bands of same material as jacket, with bolted fasteners.
N.
Roof Penetration: Factory-fabricated thimble, flashing, and counterflashing.
O.
Fabricate sections, fittings, and accessories as individual pieces or in combination
lengths for field handling.
P.
Fabricate components with centrifugally cast refractory lining in lengths suitable for
connection with drawband.
Q.
Bond refractory to steel jacket with calcium aluminate cement to prevent separation in
finished product during shipping, handling, and installation.
Acid-resistant-coated cast-iron anchor lugs for securing stack to
Clark County DOA Standard Specifications – 15550
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SECTION 15550
BREECHINGS, CHIMNEYS AND STACKS
R.
2.5
Fabricate stacks with anchor lugs, cleanout, T-sections, flashing and counterflashing,
and provisions for support, expansion, and contraction.
FABRICATED METAL BREECHINGS
A.
Materials: Black, carbon, hot-rolled steel complying with ASTM A 569; minimum metal
thickness for corresponding sizes as indicated for the following diameters or long side
dimensions:
1.
12 Inches and Smaller: 0.0478 inch.
2.
13 to 24 Inches: 0.0598 inch.
3.
25 to 36 Inches: 0.0747 inch.
4.
37 to 60 Inches: 0.1046 inch.
5.
Larger Than 60 Inches: 0.1345 inch.
B.
Materials Less Than 24 Inches in Diameter: Galvanized-steel sheet complying with
ASTM A 527, lock-forming quality with ASTM A 525, G 90 zinc coating; minimum metal
thickness corresponding to duct sizes in SMACNA "HVAC Duct Construction Standards,
Metal and Flexible."
C.
Fabricate breechings in shop to minimize field welding. Match-mark sections for field
assembly.
1.
Longitudinal Seams: Welded, except longitudinal seams for breechings less
than 24 inches in diameter may be grooved.
2.
End Joints: Weld, lap, and bolt, or use companion flanges; except breechings
less than 24 inches in diameter may have beaded and crimped joints.
D.
Reinforce rectangular breeching with angle frames as follows for corresponding long side
dimensions:
1.
30 Inches and Smaller: No reinforcing required.
2.
31 to 36 Inches: 1-1/2 by 1-1/2 by 3/16 inch, 30 inches o.c.
3.
37 to 60 Inches: 2 by 2 by 1/4 inch, 30 inches o.c.
4.
Larger Than 60 Inches: 3 by 3 by 1/2 inch, 30 inches o.c.
E.
Reinforce round breechings with either flanged girth joints or angle frames as follows for
corresponding diameter:
1.
30 Inches and Smaller: No reinforcing required.
2.
31 to 36 Inches: 1-1/2 by 1-1/2 by 3/16 inch, 30 inches o.c.
3.
37 to 60 Inches: 2 by 2 by 1/4 inch, 30 inches o.c.
4.
Larger Than 60 Inches: 3 by 3 by 1/2 inch, 30 inches o.c.
F.
Fabricate elbows with centerline radius equal to associated breeching width. Limit
angular tapers to 20 degrees maximum for expanding tapers. Install accessories during
fabrication to greatest extent possible.
G.
Fabricate breechings with support lug for attachment to building structure.
H.
Barometric Dampers: Adjustable, self-actuating draft dampers, where indicated, full size
of breeching.
Clark County DOA Standard Specifications – 15550
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SECTION 15550
BREECHINGS, CHIMNEYS AND STACKS
I.
Cleanout Doors: Same weight as breeching.
J.
2.6
2.7
Thermally Actuated Vent Dampers: Sized to match draft hood collar, constructed of
stainless-steel housing and brackets, 4 quadrants secured to brackets constructed of
corrosion-resistant bimetal. Brass weights secured to quadrants to prevent vibrations
and noise during high draft conditions. Units tested according to AGA standards, and
design certified to comply with ANSI Z21.66.
MECHANICAL DRAFT VENT FANS
A.
Fabrication: Enameled-steel venturi tube for sizes 20 inches in diameter and smaller and
Type 304 stainless-steel venturi tube for sizes 22 to 48 inches in diameter.
B.
Fan: Forward-curved venturi type, with motor.
INDUCED DRAFT VENT FANS
A.
Forward curved fan and scroll fabricated of mild steel with direct-drive, shaded-pole
motor with ball bearings, internal cooling fan, stainless-steel shaft, and internal centrifugal
switch.
PART 3 - EXECUTION
3.1
3.2
INSTALLATION OF DOUBLE-WALL CONNECTORS, BREECHINGS, AND VENTS
A.
Install gas vents as indicated, according to manufacturer's written installation instructions.
Locate to comply with stipulated minimum clearances from combustibles.
B.
Seal between sections of positive-pressure vents according to manufacturer's installation
instructions, using only sealants recommended by manufacturer.
C.
Support vents at intervals recommended by the manufacturer to support the weight of the
vent and all accessories, without exceeding loading of appliances.
INSTALLATION OF REFRACTORY-LINED BREECHINGS AND STACKS
A.
Assemble and erect stack sections and accessories according to manufacturer's written
instructions.
B.
Connect base section to foundation using anchor lugs of size and number recommended
by manufacturer.
C.
Join sections with acid-resistant joint cement to provide continuous joint and smooth
interior finish.
D.
Erect stacks level and plumb to finished tolerance of no more than 1 inch out of plumb
from top to bottom.
Clark County DOA Standard Specifications – 15550
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SECTION 15550
BREECHINGS, CHIMNEYS AND STACKS
E.
3.3
Slope breechings down to appliance, with condensate drain connection at lowest point
piped to nearest drain.
INSTALLATION OF FABRICATED BREECHINGS
A.
Install concrete inserts in formwork to support breeching independently of its appliance
connection.
B.
Assemble and erect fabricated breechings according to SMACNA "HVAC Duct
Construction Standards, Metal and Flexible."
C.
Align breechings at connections, with smooth internal surface and 1/8-inch misalignment
tolerance.
D.
Slope breechings down to appliance, with condensate drain connection at lowest point
piped to nearest drain.
E.
Install accessories, dampers, fans, equipment, controls, and other supports.
F.
Anchor breechings to building structure with bolts, concrete inserts, steel expansion
anchors, welded studs, C-clamps, or special beam clamps.
G.
Support vertical breechings at 12-foot intervals by attaching to adjacent vertical structural
surfaces or by direct bearing at floor penetrations and similar locations.
1.
24 by 20 Inches and Smaller: Use 1-1/2-by-0.0598-inch straps or formed angles.
2.
Larger Than 24 by 20 Inches: Use steel angle brackets 1 by 1/8 inch for sizes 36
by 18 inches or smaller; 1-1/2 by 1/8 inch for larger sizes.
H.
Support horizontal breechings located against structural walls and other similar adjacent
vertical surfaces at 96-inch intervals for units with horizontal dimensions of 40 inches and
smaller, and at 48 inch intervals for larger breechings.
1.
Where Width Is Less Than Height: With 1-1/2-by-0.0598-inch straps.
2.
Where Width Is More Than Height: With shelf-type fabricated angle brackets; 1
by 1/8 inch for widths 18 inches and smaller; 1-1/2 by 1/8 inch for larger widths.
I.
Support horizontal rectangular breechings from overhead structure with bolted hangers
at 120-inch intervals for unit widths 60 inches and smaller, and 96-inch intervals for larger
breechings.
1.
Breechings 60 Inches in Width and Smaller: 1-by-0.0598-inch straps.
2.
Breechings 61 to 96 Inches in Width: 1-1/2-by-0.1046-inch straps.
J.
Trapeze Hangers: Support breechings with horizontal angles and vertical supports
according to the following long side dimensions:
1.
30-Inch Size and Smaller: 1-by-1/8-inch angle, with 1-by-0.0478-inch- or 1/4inch- diameter hangers.
2.
31- to 60-Inch Size: 1-1/2-by-1/8-inch angle, with 1-1/2-by-0.0598-inch- or 3/8inch- diameter hangers.
3.
61- to 84-Inch Size: 2-by-1/8-inch angle, with 1-1/2-by-0.0747-inch- or 1/2-inchdiameter hangers.
Clark County DOA Standard Specifications – 15550
Ver. 1.0
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September 5, 2005
SECTION 15550
BREECHINGS, CHIMNEYS AND STACKS
4.
K.
3.4
3.6
Support horizontal round breechings with girth strap and strap hanger (of same size).
Install pair of strap hangers bolted to opposite sides of angle reinforcing rings or flanged
joints.
Support breechings at 120-inch intervals with hangers as follows for
corresponding diameters.
1.
30-Inch Diameter and Smaller: 1-by-0.0598-inch- strap hangers.
2.
31- to 50-Inch Diameter: 1-1/2-by-0.0598-inch- strap hangers.
3.
51- to 84-Inch Diameter: Pairs of 1-1/2-by-0.0598-inch- strap hangers.
INSTALLATION OF DAMPERS
A.
3.5
Larger Than 84-Inch Size: 2-by-1/4-inch angle, with 5/8-inch- diameter hangers,
except as otherwise shown.
Install barometric and thermostatically operated dampers according to manufacturer's
instructions. Locate as close to draft hood collar as possible.
CLEANING
A.
After completing system installation, including outlet fittings and devices, inspect exposed
finish. Remove burrs, dirt, and construction debris, and repair damaged finishes,
including chips, scratches, and abrasions.
B.
Clean breechings internally during installation to remove dust and debris. Clean external
surfaces to remove welding slag and mill film. Grind welds smooth.
PROTECTION
A.
Temporary Closure: Provide at ends of breechings and chimneys that are not completed
or connected to equipment.
END OF SECTION
Clark County DOA Standard Specifications – 15550
Ver. 1.0
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September 5, 2005
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