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    Vents and Stacks

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    adel rihana
    The document describes specifications for vents and stacks, including refractory-lined metal stacks. It provides details on submittal requirements, quality assurance, materials, fabrication, and installation. Refractory-lined metal stacks are to be designed for wind loads up to 241 km/h and seismic zone 2A, and fabricated from aluminized or galvanized steel with a refractory lining to withstand high temperatures.

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    © All Rights Reserved
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    Vents and Stacks

    Uploaded by

    adel rihana
    84 views5 pages
    The document describes specifications for vents and stacks, including refractory-lined metal stacks. It provides details on submittal requirements, quality assurance, materials, fabrication, and installation. Refractory-lined metal stacks are to be designed for wind loads up to 241 km/h and seismic zone 2A, and fabricated from aluminized or galvanized steel with a refractory lining to withstand high temperatures.

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    15550_vents_and_stacks.doc

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    The document describes specifications for vents and stacks, including refractory-lined metal stacks. It provides details on submittal requirements, quality assurance, materials, fabrication, and installation. Refractory-lined metal stacks are to be designed for wind loads up to 241 km/h and seismic zone 2A, and fabricated from aluminized or galvanized steel with a refractory lining to withstand high temperatures.

    Copyright:

    © All Rights Reserved
    Download as DOC, PDF, TXT or read online from Scribd
    Download as doc, pdf, or txt
    84 views5 pages

    Vents and Stacks

    Uploaded by

    adel rihana
    The document describes specifications for vents and stacks, including refractory-lined metal stacks. It provides details on submittal requirements, quality assurance, materials, fabrication, and installation. Refractory-lined metal stacks are to be designed for wind loads up to 241 km/h and seismic zone 2A, and fabricated from aluminized or galvanized steel with a refractory lining to withstand high temperatures.

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    © All Rights Reserved
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    Download as doc, pdf, or txt
    of 5

    <Project Title>

    PROJECT STANDARD SPECIFICATION

    SECTION 15550 - VENTS AND STACKS

    PART 1 - GENERAL

    0.1 RELATED DOCUMENTS

    A. Drawings and general provisions of the Contract, including Conditions of Contract and
    Division 1 Specification Sections, apply to this Section.

    0.2 SUMMARY

    A. This Section includes the following:

    1. Refractory-lined metal stacks.

    0.3 SUBMITTALS

    A. Product Data: For each type of product indicated. Include rated capacities; shipping,
    installed, and operating weights; furnished specialties; and accessories.

    B. Shop Drawings: Show fabrication and installation details for vents and stacks. Include
    plans, elevations, sections, details, and attachments to other Work. Detail assemblies and
    indicate dimensions, weights, loads, required clearances, method of field assembly,
    components, hangers and seismic restraints, and location and size of each field connection.

    1. Wiring Diagrams: Detail power, signal, and control systems and differentiate
    between manufacturer-installed and field-installed wiring.

    C. Welding Certificates: Copies of certificates for welding procedures and personnel.

    D. Qualification Data: For firms and persons specified in "Quality Assurance" Article to
    demonstrate their capabilities and experience. Include lists of completed projects with
    project names and addresses, names and addresses of architects/engineers and owners, and
    any other information required by the Engineer.

    E. Engineering Report: Certifying that stacks meet the design wind and seismic loads.

    F. Maintenance Data: For vent fans to include in maintenance manuals specified in Division 1.

    0.4 QUALITY ASSURANCE

    A. Manufacturer Qualifications: A firm experienced in manufacturing refractory-lined stacks


    similar to those indicated for this Project and with a record of successful in-service
    performance.

    B. Source Limitations: Obtain Type B vent system components through one source from a
    single manufacturer.

    VENTS AND STACKS 15550 - Page 1/5


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    C. Welding Standards: Qualify procedures and personnel according to AWS D1.1, "Structural


    Welding Code--Steel," for hangers and supports, and AWS D9.1, "Sheet Metal Welding
    Code," for duct joint and seam welding.

    D. Electrical Components, Devices, and Accessories: Listed and labeled as defined in


    NFPA 70, Article 100, by a testing agency acceptable to Engineer.

    E. Comply with AWS D1.1 for welder qualifications, welding details, and workmanship
    standards.

    F. Comply with SMACNA's "Guide for Steel Stack Design and Construction."

    G. Comply with SMACNA's "HVAC Duct Construction Standards, Metal and Flexible" for
    fabricated breechings.

    PART 2 - PRODUCTS

    0.1 REFRACTORY-LINED METAL VENTS AND STACKS

    A. Requirements in this Article are for freestanding stacks.

    B. Design Wind Loads: 241 km/h.

    C. Design Seismic Loads: Zone 2A.

    D. Stack Outer Jacket: 0.5 mm aluminized steel with riveted seams.

    E. Stack Outer Jacket: 3 mm galvanized steel with welded seam joint.

    F. Refractory Lining: Tested according to UL 959 for temperature and acid resistance, and
    bearing the testing laboratory label.

    1. Temperature Rating: 982 deg. C continuous firing and 1093 deg. C intermittent firing
    without fusion.
    2. Acid Extraction: Maximum of 0.2 percent.
    3. Cold Crushing Strength: Minimum of 22 MPa.
    4. Thickness: Minimum of 50 mm.

    G. Finish: Factory-applied, high-heat-resistant paint; color as selected.

    H. Base Section: Acid-resistant-coated, cast-iron anchor lugs for securing stack to foundation.

    I. Cleanout Section: Smoke tight with gasketed and bolt-tightened inspection plate; weld neck
    to stack section.

    J. ‘Tee’ or ‘Y’ Section: Smoke-tight connection, with welded joints and refractory lining;
    finished with smooth transition and with no exposed metal on inside.

    K. Spark Screen: ASTM A 666, Type 304 stainless steel, 1.6 mm thick, 13-by-13 mm mesh,
    with Type 304 stainless-steel rolled angle and drawband.

    L. Guy Bands: 200 mm wide bands of same material as jacket, with bolted fasteners.

    VENTS AND STACKS 15550 - Page 2/5


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    M. Roof Penetration: Factory-fabricated thimble, flashing, and counterflashing.

    N. Fabricate sections, fittings, and accessories as individual pieces or in combination lengths


    for field handling.

    O. Fabricate components with centrifugally cast refractory lining in lengths suitable for
    connection with drawband.

    P. Bond refractory to steel jacket with calcium-aluminate cement to prevent separation in


    finished product during shipping, handling, and installation.

    Q. Fabricate stacks with anchor lugs; cleanout; T-sections; flashing and counterflashing; and
    provisions for support, expansion, and contraction.

    0.2 FABRICATED METAL STACKS

    A. Stacks Less Than 600 mm in Diameter: Galvanized-steel sheet complying with


    ASTM A 653/A 653M, Z275 coating designation; minimum metal thickness corresponding
    to duct sizes in SMACNA's "HVAC Duct Construction Standards, Metal and Flexible."

    B. Vents: Black, carbon, hot-rolled steel complying with ASTM A 569/A 569M; minimum


    metal thickness for corresponding sizes as indicated for the following diameters.
    1.

    1. 600 and Smaller: 1.5 mm.


    2. 625 to 900 mm: 2.0 mm.
    3. 925 to 1500 mm: 3.0 mm.
    4. Larger Than 1500 mm: 3.5 mm.

    C. Fabricate stack in shop to minimize field welding. Match-mark sections for field assembly.

    1. Longitudinal Seams: Welded.


    2. End Joints: Weld, lap, and bolt, or use companion flanges.
    3. 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.
    4. Support Lug: Welded to fabricated vents for attachment to building structure.

    D. Reinforce round stacks with either flanged girth joints or angle frames as follows for
    corresponding diameter:

    1. 750 mm and Smaller: No reinforcement required.


    2. 775 to 900 mm: 38 by 38 by 5 mm, 750 mm o.c.
    3. 925 to 1500 mm: 50 by 50 by 6 mm, 750 mm o.c.
    4. Larger Than 1500 mm: 75 by 75 by 13 mm, 750 mm o.c.

    E. Barometric Dampers: Adjustable, self-actuating draft dampers, where indicated, full size of
    breeching.

    F. Cleanout Doors: Same weight as breeching, bolted and gasketed.

    G. Thermally Actuated Vent Dampers: Tested according to AGA standards, design certified to
    comply with ANSI Z21.66, and sized to match draft hood collar; constructed of stainless-
    steel housing and brackets with four quadrants secured to brackets constructed of corrosion-

    VENTS AND STACKS 15550 - Page 3/5


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    resistant bimetal. Brass weights secured to quadrants to prevent vibrations and noise during
    high-draft conditions.

    0.3 GUYING AND BRACING MATERIALS

    A. Cable: Galvanized, stranded wire of the following minimum thickness:


    1. For ID Sizes Up to 600 mm: 9.5 mm in diameter.
    2. For ID Sizes 625 to 750 mm: 11 mm in diameter.
    3. For ID Sizes 775 to 900 mm: 12.5 mm in diameter.
    4. For ID Sizes 925 to 1200 mm: 14.5 mm in diameter.
    5. For ID Sizes 1225 to 1500 mm: 16 mm in diameter.

    B. Pipe: 32 mm diameter, galvanized steel.

    C. Angle Iron: Galvanized steel 380 by 380 by 5 mm.

    PART 3 - EXECUTION

    0.1 INSTALLATION OF MANUFACTURED STACKS

    A. Install according to manufacturer's written instructions. Locate to comply with minimum


    clearances from combustibles.

    B. Install, support, and restrain according to requirements of seismic zone.

    C. Seal between sections of positive-pressure vents according to manufacturer's written


    installation instructions, using sealants recommended by the manufacturer.

    D. Support vents at intervals recommended by the manufacturer to support weight of vent and
    all accessories, without exceeding loading of appliances.

    1. Where maximum unsupported lengths of stack are exceeded, support vents as


    follows:

    a. Guy wires.
    b. Rigid pipe braces.
    c. Rigid angle-iron braces.

    0.2 INSTALLATION OF REFRACTORY-LINED STACKS

    A. Assemble and erect stack sections and accessories according to manufacturer's written
    installation instructions. Locate to comply with minimum clearances from combustibles.

    B. Install, support, and restrain according to requirements of seismic zone.

    C. Connect base section to foundation using anchor lugs of size and number recommended by
    the manufacturer.

    D. Join sections with acid-resistant joint cement to provide continuous joint and smooth
    interior finish.

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    E. Erect stacks level and plumb to finished tolerance of no more than 25 mm out of plumb
    from top to bottom.

    F. Slope vents down to appliance, with condensate drain connection at lowest point piped to
    nearest drain.

    0.3 CLEANING

    A. After completing system installation, including terminals, inspect exposed finishes.


    Remove paint splatters and other spots, dirt, and debris. Repair damaged finish to match
    original finish.

    B. Clean vents internally, during and on completion of installation, to remove dust and debris.
    Clean external surfaces to remove welding slag and mill film. Grind welds smooth.

    C. Provide temporary closures at ends of vents that are not completed or connected to
    equipment.

    0.4 COMMISSIONING

    A. Engage a factory-authorized service representative to perform startup service for fans.

    B. Verify that fans are installed and connected according to the Contract Documents.

    C. Complete installation and startup checks according to manufacturer's written instructions,


    and confirm fan interlocks.

    0.5 DEMONSTRATION

    A. Engage a factory-authorized service representative to train the Employer's maintenance


    personnel to adjust, operate, and maintain fans. Refer to Division 1 Section
    "[Demonstration and Training] [Closeout Procedures]."

    END OF SECTION 15550

    VENTS AND STACKS 15550 - Page 5/5


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