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   PART 1 - GENERAL

    01 WORK INCLUDED

    A. Provide vibration materials and related items, and perform work as shown on drawings and as specified herein.

    B. Factory fabricated vibration isolators shall be sized by the vibration isolation supplier in consultation with equipment supplier.

    C. Deflection for spring isolators shall be selected in accordance with recommendations in the current issue of ASHRAE Handbook of Fundamentals, unless noted otherwise on drawings.

    D. Installer is to be responsible for providing vibration isolators of appropriate sizes and weight loading to meet the specified deflection requirements, in accordance with instructions of manufacturer of vibration isolators.

    02 SUBMITTALS

    A. Submit product data to Architect for approval as required by Section 15010.

    PART 2 - PRODUCTS

    03 ACCEPTABLE MANUFACTURERS

    A. Vibration isolators are to be the product of the following manufacturers or approved equal:

    1. Consolidated Kinetics.

    2. Mason Industries, Inc.

    3. Peabody Noise Control.

    4. Vibration Mountings & Controls, Inc.

    5. Korfund Company.

    6. Vibration Eliminators.

    B. Manufacturer's representative is to instruct installer in proper installation procedures.

    2.02 ISOLATION MATERIAL

    A. Fiberglass Pads and Shapes: Glass fibers of not more than 0.18 mil diameter which are bonded annealed and stabilized during the manufacturing process to achieve a natural frequency of not more than 12 Hertz. The natural frequency shall be constant over a wide operating load range and the stiffness shall increase proportionately with the load applied. Furnish in the thicknesses and shapes required for use in vibration isolation units.

    B. Neoprene Elastomer Pads and Shapes: Neoprene elastomers which are resistant to oils, acids and alkalis, and have a temperature range of 0o to 200oF. Pads and shapes shall be furnished of the manufacturer's standard hardness and shall be so designed as to provide features of shear and compression for isolation efficiency and protection against shock overload. Furnish in the thicknesses and shapes required for use in vibration isolation units.

    C. Steel Springs: Wound-steel compression springs of high strength, heat-treated, spring alloy steel with an outside diameter not less than 0.8 times the operating height; with lateral spring stiffness not less than the vertical stiffness; and designed to reach the solid height before exceeding the rated fatigue point of the steel.

    2.03 ISOLATION SUPPORT UNITS

    A. Type 1 - Pads: Manufacturer's standard molded inorganic fiberglass coded to indicate load capacity.

    B. Type 2 - Isolator: Double deflection neoprene mounting. All metal surfaces shall be neoprene covered to avoid corrosion. Top and bottom shall have non-skid friction ribs. Bolt holes shall be provided for those areas where bolting is required.

    C. Type 2 - Hanger: Steel housing with one-piece neoprene-in-shear isolation unit having all metallic surfaces covered to resist corrosion. Hanger shall be designed to carry a 500% overload without failure.

    Type 3 - Isolator: Free-standing spring type isolator, laterally stable without housing. The spring shall be mounted between top and bottom loading plates and a 1/4" thick isolation pad shall be located between the bottom loading plate and the support. Isolator shall have leveling bolt that must be rigidly bolted to the equipment.

    D. Type 3A - Hanger: Steel housing with laterally stable spring and load transfer plate. Hanger shall be designed to carry a 500% overload without failure.

    E. Type 3B - Hanger: Combination hanger incorporating a precompressed fiberglass or neoprene elastomer isolation pad in series with a steel spring, all encased in a welded steel bracket. Spring diameter and lower bracket hole shall be large enough to permit the hanger rod to swing through a 30o arc before contacting the hole and short circuiting the spring. Hanger shall be designed to carry a 500% overload without failure.

    F. Type 4 - Isolator: Restrained free-standing spring type isolator with laterally stable springs and incorporating vertical limit stops to assure a constant operating height if the supported weight is removed, and to reduce movement due to wind loads. Limit stops shall be out of contact during normal operations and shall be isolated from the housing to prevent short-circuiting.

    2.04 VIBRATION ISOLATION BASE TYPES

    A. Type A - Base: Defined as the condition when a separate base is not used and the isolators are attached directly to the supported equipment.

    B. Type B - Base: Structural steel base or rails constructed of wide flange structural steel with depth equal to 10% of the longest span of the equipment but not less than 6". Bases shall have adjustable motor slide rails built-in where required by equipment.

    C. Type C - Base: Reinforced concrete inertia base. The structural steel frame shall be designed and supplied by the isolator manufacturer. Concrete shall be poured into the frame at the job site. The welded steel frame shall be fabricated using ASTM A36 shapes, plates and bars.

    The base shall incorporate prelocated equipment anchor bolts, 1/2" diameter (Number 4) reinforcing bars on nominal 8" centers each way with both ends of each bar butt welded to the base framing. Provide height saving isolator support brackets, and anchor base frame to spring isolator units. The thickness of the base shall be a minimum of 8% of the longest span between isolators but not less than 6 inches deep.

    D. Type D - Base: Roof mounting curb, vibration control base consisting of extruded aluminum upper and lower members with cadmium plated steel spring isolator selected for 1" static deflection. Provide neoprene weather seal continuous between upper and lower base.

    2.05 PIPING ISOLATION UNITS

    A. Type K - Flexible Neoprene Connectors:

    1. Flexible neoprene connectors shall be used on equipment as indicated on the drawings or on the equipment schedule. They shall be manufactured of multiple plies of nylon tire cord fabric and neoprene both molded and cured in hydraulic rubber presses. No steel wire or rings shall be used as pressure reinforcement. Straight connectors shall have two spheres. Connectors up to and including 2" diameter may have threaded ends. Connectors 2-1/2" and larger shall be manufactured with floating galvanized flanges recessed to lock the connector's raised face neoprene flanges. Connectors shall be rated a minimum of 150 psi at 220oF.

    B. Type M - Acoustical Seal:

    1. Where piping passes through equipment room walls, floors or ceilings, the vibration isolator manufacturer shall provide a split seal consisting of two bolted pipe halves with 3/4" or thicker neoprene sponge bonded to the inner faces. The seal shall be tightened around the pipe to eliminate clearance between the inner sponge face and the piping. Seals shall project a minimum of 1" past either face of the wall. Where temperatures exceed 240oF, 10# density fiberglass may be used in lieu of the sponge.

   PART 3 - EXECUTION

    04 PERFORMANCE OF ISOLATORS

    A. General: Comply with the minimum static deflections shown on the drawings or as recommended by the American Society of Heating, Refrigerating and Air-Conditioning Engineers, including the definitions of critical and non-critical locations, for the selection and application of vibration isolation materials and units as indicated.

    B. Manufacturer's Recommendations: Except as otherwise indicated, comply with manufacturer's recommendations for selection and application of vibration isolation materials and units.

    05 APPLICATIONS

    A. General: Except as otherwise noted on the drawings or in the equipment schedules, apply the following types of vibration isolators at the indicated locations or for the indicated items of equipment. Selection is Contractor's option where more than one type is indicated.

    1. Type 1 - Isolation pads (molded fiberglass); Type A Base

    a) Cooling towers on grade supported slab

    2. Type 2 - Neoprene in shear isolators; Type A Base

    a) Air handling units on grade supported slab, except as noted.

    3. Type 2 - Neoprene in shear isolators; Type B Base

    a) Centrifugal fans/belted vent set on grade supported slab, except as noted.

    4. Type 3 - Spring Isolators; Type A Base

    a) Air handling units

    b) Air compressors, tank mounted

    5. Type 3 - Spring hanger; Type A Base

    a) In-line/Axial Relief/Return air fans

    6. Type 3 - Spring isolator; Type B Base

    a) Centrifugal fan/belted vent set on grade supported slab, except as noted

    b) Rooftop air conditioning units over 30 tons nominal capacity

    7. Type 3 - Spring isolator; Type C Base

    a) Flexible coupled pump

    8. Type 3 - Spring isolator; Type D Base

    a) Rooftop air conditioning units over 30 tons nominal capacity

    9. Type 4 - Spring isolators; Type C Base

    a) Centrifugal water chillers

    10. Type 4 - Spring isolators; Type A Base

    a) Cooling towers on roof/floor structure

    b) Reciprocating water chillers

    11. Type K - Flexible connectors

    a) Chilled water pumps

    b) Hot water pumps

    c) Condenser water pumps

    d) Centrifugal water chillers

    12. Type M - Acoustical pipe seal

    a) Piping passing through fan room walls

    3.02 INSTALLATION

    A. General: Except as otherwise indicated, comply with manufacturer's instructions for the installation and load application to all vibration isolation materials and units. Adjust to ensure that units do not exceed rated operation deflections or bottom out under loading, and are not short-circuited by other contacts or bearing points. Remove space blocks and similar devices (if any) intended for temporary protection against overloading during installation.

    B. Anchor and attach units to substrate and equipment as required for secure operation and to prevent displacement by normal forces, and as indicated.

    C. Adjust leveling devices as required to distribute loading uniformly onto isolators. Shim units as required where leveling devices cannot be used to distribute loading properly.

    D. Install inertia base frames on isolator units as indicated, so that a minimum of 2" clearance below base will result when frame is filled with concrete and supported equipment has been installed and loaded for operation.

    E. Locate isolation hangers as near the overhead support structure as possible.

    F. Flexible connectors and hoses shall be installed in accordance with the manufacturer's instructions. They shall be installed on the equipment side of the shut-off valves. Neoprene straight connectors shall be properly pre-extended to prevent additional elongation under pressure. Although straight connectors can be installed either vertically or horizontally, it is preferred they be located in a horizontal position and parallel to the equipment shaft.

    G. Acoustical wall seals: If the piping goes in before the walls, clamp the seal in place and pour the walls around the outside of the seal. If the walls are up first, drill or break the wall in the piping location; then clamp the seal on and back pack the concrete around the seal.

    H. Install vibration isolation curb in accordance with manufacturer's instructions.

    1. Install equipment on curb to provide watertight seal. Provide continuous closed cell, neoprene gasket bonded to top and bottom of vibration control base. Caulking shall be kept to a minimum.

    END OF SECTION

Rembco Geotechnical Contractors specializes in slope stabilization, foundation repair and support, shoring, grouting, soil nails, micropile installations, and sinkholes. We are experienced in these applications: micro piles, sinkhole repair, permeation grouting, pressure grouting, soil nails, chemical grouting, micropiles, compaction grout, rock anchors and compaction piles. Our specialties are rock anchor, chemical and compaction grouting, mini piles, sinkhole repair, micropiles, and soil nailing. We use a problem-solving approach in the geotechnical portions of buildings, bridges, water plants, sewage plants, tunnels, sinkholes, caisson, and roads. Rembco techniques apply when adding new real estate structures: especially rock anchor, microfine grouting, soil nailing, micropile installations for foundation support. Add URL Construction, Drilling and Concrete