NATIONWIDE SAN ANTONIO SALES & SERVICE CENTER

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1 SECTION SEISMIC CONTROLS AND WIND RESTRAINTS PART 1 GENERAL 1.01 RELATED DOCUMENTS A. Not Applicable 1.02 SUMMARY A. This section includes the design, application and installation of seismic and wind restraints for mechanical equipment and components and are in addition to requirements specified elsewhere for the support and attachement of mechanical equipment and components. B. The materials, systems and professional engineering services specified in this section shall be purchased from a single seismic and wind restraint manufacturer to assure sole source responsibility of the performance for the seismic restraints used. C. The Contractor shall coordinate all information on mechanical equipment and components with the seismic and wind restraint manufacturer to ensure that all components requiring seismic and wind restraints have been properly addressed DEFINITIONS A. Seismic Restraint: A structural support element such as a metal framing member, a cable, an anchor bolt or stud, a fastening device, a dampening device or an assembly of these items used to transmit seismic forced from an item of equipment or system to building structure and to limit movement of item during a seismic event. B. IBC: International Building Code SUBMITTALS A. Product Data: Illustrate and indicate style, material, strength, fastening provisions, and finish for each type and size of seismic-restraint component used. 1. Tabulate types and sizes of seismic restraints showing design data for each restraint including specific anchorage details. 2. Annotate to indicate application of each product submitted and compliance with requirements. 3. Utilize a seismic and wind restraint schedule. Each and every mechanical component shall be listed in the schedule as well as all appropriate information for each component. B. Shop Drawings: Indicate materials and dimensions and identify hardware, including attachment and anchorage devices, signed and sealed by a qualified Registered Professional Engineer with a minimum of five (5) years working experience in this field. Include the following: 1. Fabricated Supports: Representations of field-fabricated supports not detailed on Drawings. BP2 Addendum No

2 2. Seismic and Wind Restraints: Detail anchorage and bracing not defined by details or charts on Drawings. Include the following: a. Design Analysis: To support selection and arrangement of seismic and wind restraints. Include calculations of combined tensile and shear loads. b. Details: Detail fabrication and arrangement. Detail attachments of restraints to the restrained items and to the structure. Show attachment locations, methods, and spacings. Identify components, list their strengths, and indicate directions and values of forces transmitted to the structure during seismic and wind events. C. Coordination drawings: Show coordination of seismic and wind bracing for mechanical components with other systems and equipment in the vininity, including other supports and seismic/wind restraints. D. Field quality-control test reports QUALITY ASSURANCE A. Comply with seismic-restraint requirements in the International Building Code unless requirements in this Section are more stringent PROJECT CONDITIONS A. Seismic-Restraint Loading: 1. Site Class as Defined in the IBC: C. 2. Assigned Seismic Use Group or Building Category as Defined in the IBC: II. a. Component Importance Factor: 1.0. b. Component Response Modification Factor: Design Spectral Response Acceleration at Short Periods (0.2 Second): SDS = Design Spectral Response Acceleration at 1-Second Period: SD1 = B. Wind-Restraint Loading: 1. Basic Wind Speed: 110 MPH 2. Building Classification Category: II 3. Minimum 10 lb/sq. ft. multiplied by the maximum area of the HVAC component projected on a vertical plane that is normal to the wind direction, and 45 degrees either side of normal. PART 2 PRODUCTS 2.01 MANUFACTURERS A. In other Part 2 articles where titles below introduce lists, the following requirements apply to product selection: BP2 Addendum No

3 1. Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated into the Work include, but are not limited to manufacturer s specified. 2. Manufacturers: Subject to compliance with requirements, provide products by one of the manufacturer s specified SOURCE OF MATERIALS a. Kinetics Noise Control b. Allied Support Systems c. Loos & Co., Inc. d. Michigan Hanger Co. Inc. e. National Pipe Hanger Corp. f. Seasafe, Inc. g. Vibro-Acoustics A. All seismic and wind restraints and combination restraint/vibration isolation materials specified herein shall be provided by a single manufacturer to assure sole source responsibility for the proper performance of the materials used. B. Mechanical anchor types and sizes are to be per the design data as provided by the seismic and wind restraint manufacturer. C. All seismic and wind snubber restraint assemblies should meet the following minimum requirements: 1. Impact surface should have a high quality elastomeric facing so to ensure that no metal-to-metal contact can occur. 2. Resilient material should be easy to visually inspect for damage and be replaceable if necessary. 3. Resilient material used in snubber assemblies to be a minimum of 0.25 (6 mm) thick. 4. Resilient material used in snubber grommets to be a minimum of 0.12 (3 mm) thick. 5. Assembly must be designed to offer seismic restraint in all directions, unless otherwise noted. 6. Clearance between resilient material and contacting isolated equipment surface must not exceed 0.25 (6 mm) SEISMIC RESTRAINT TYPES A. Type 1 Coil Spring Isolator Incorporated Within a Steel Housing 1. Spring isolators shall be seismic control restrained spring isolators, incorporating a single or multiple coil spring element, having all of the characteristics of free standing coil spring isolators as specified in the vibration isolation portion of this specification. Springs shall be restrained using a housing engineered to limit both lateral and vertical movement of the supported equipment during an BP2 Addendum No

4 earthquake without degrading the vibration isolation capabilities of the spring during normal equipment operating conditions. 2. Vibration isolators shall incorporate a steel housing and neoprene snubbing grommet system designed to limit motion to no more than ¼ (6 mm) in any direction and to prevent any direct metal-to-metal contact between the supported member and the fixed restraint housing. The restraining system shall be designed to withstand the seismic design forces in any lateral or vertical direction without yield or failure. Where the capacity of the anchorage hardware in concrete is inadequate for the required seismic loadings, and adapter base plate to allow the addition of more or larger anchors will be fitted to fulfill these requirements. In addition to the primary isolation coil spring, the load path will include a minimum ¼ (6 mm) thick neoprene pad. 3. Spring elements shall be color coded or otherwise easily identified. Springs shall have a lateral stiffness greater than 1.2 times the rated vertical stiffness and shall be designed to provide a minimum of 50% overload capacity. Non-welded spring elements shall be epoxy powder coated and shall have a minimum of a 1000 hour rating when tested in accordance with ASTM B To facilitate servicing, the isolator will be designed in such a way that the coil spring element can be removed without the requirement to lift or otherwise disturb the supported equipment. B. Type 2 Coil Spring Isolator Incorporated Within a Steel Housing 1. Spring isolators shall be seismic control restrained spring isolators, incorporating one or more coil spring elements, having all of the characteristics of free standing coil spring isolators per the vibration isolation section of this specification for equipment which is subject to load variations and/or large external forces. Isolators shall consist of one or more laterally stable steel coil springs assembled into fabricated welded steel housings designed to limit movement of the supported equipment in all directions. 2. Housing assembly shall be made of fabricated steel members and shall consist of a top load plate complete with adjusting and leveling bolts, adjustable vertical restraints, isolation washers, and a bottom load plate with internal non-skid isolation pads and holes for anchoring the housing to the supporting structure. Housing shall be hot dipped galvanized for outdoor corrosion resistance. Housing shall be designed to provide a constant free and operating height within 1/8 (3 mm). 3. The isolator housing shall be designed to withstand the project design seismic forces in all directions. 4. Coil spring elements shall be selected to provide static deflections as required by the project. Spring elements shall be color coded or otherwise easily identified. Springs shall have a lateral stiffness greater than 1.2 times the rated vertical stiffness and shall be designed to provide a minimum of 50% overload capacity. Non-welded spring elements shall be epoxy powder coated and shall have a minimum of a 1000 hour rating when tested in accordance with ASTM B-117. C. Type 3 Coil Spring Isolator Incorporated Within a Steel Housing BP2 Addendum No

5 1. Spring isolators shall be lateral restrained spring isolators, incorporating a single coil spring element, having all fo the characteristics of free stanging coil spring isolators as previously specified. Springs shall be assembled into a welded steel housing engineered to limit lateral movement of supported equipment during an earthquake without degrading the vibration isolation capabilities of the spring during normal operating conditions. 2. Vibration isolators shall incorporate a steel angle and plate motion limiting assembly and steel coil spring, designed as a system to accept a force in any lateral direction in excess of the design seismic requirement for the isolator without yield or failure. Isolator shall limit lateral movement of the equipment to less than ¼ (6 mm) in any direction. The lateral limit stop shall incorporate a neoprene grommet to prevent the potential for metal-to-metal contact. The vibration isolation element shall include a ¼ (6 mm) thick ribbed neoprene noise stop pad, positioned outside of the housing anchorage path. The housing shall oncorporate drilled holes for attachments to the supporting structure. D. All Direction Neoprene Isolator 1. Vibration Isolators shall be neoprene, molded from oil resistant compounds, designed to operate within the strain limits of the isolator so as to provide the maximum isolation and longest life expectancy possible using neoprene compounds. Isolators shall include encapsulated cast-in-place top steel load transfer plate for bolting to equipment and a steel base plate with anchor holes for bolting to the supporting structure. Ductile iron or cast aluminum components are not acceptable alternatives and shall not be used due to brittleness when subjected to shock loading. 2. Isolator shall be capable of withstanding the design seismic loads in all directions with no metal-to-metal contact. 3. Isolator shall have minimum operating static deflections as required by the project and shall not exceed published load capacities. E. All Direction External Seismic Snubber Assembly 1. Equipment shall be restrained against excessive movement during a seismic event by the use of 3-axis resilient snubbers, designed to withstand the project required seismic forces. 2. Snubbers shall be of welded steel construction and shall be attached to the equipment structure and equipment in a manner consistent with anticipated design loads. Snubbers shall limit lateral and vertical equipment movement at each snubber location to a mazimum of ¼ (6 mm) in any direction. 3. Snubbers shall include a minimum ¼ (6 mm) thick resilient newprene pads to cushion any impact and to avoid any potential for metal-to-metal contact. Maximum neoprene bearing pressure shall not exceed 1,500 pounds/sq. inch (10.4 N/sq. mm). Snubber shall be installed only after the isolate dquipment is mounted, piped, and operating so as to ensure that no contact occurs during normal equipment operation. F. All Direction Lateral External Seismic Snubber Assembly BP2 Addendum No

6 1. Equipment shall be restrained against excessive lateral movement during a seismic event by the use of 2-axis horizontal resilient snubbers, designed to withstand the project required seismic forces. 2. Snubbers shall be of welded steel construction and shall be attached to the equipment structure and equipment in a manner consistent with anticipated design loads. Snubbers shall limit lateral equipment movement at each snubber location to a maximum of ¼ (6 mm). 3. Snubbers shall include a minimum of ¼ (6 mm) thick resilient neoprene pads to cushion any impact and to avoid any potential for metal-to-metal contact. Snubber shall be installed only after the isolated equipment is mounted, piped, and operating so as to ensure that no contact occurs during normal equipment operation. G. Two-Axis External Seismic Snubber Assembly 1. Equipment shall be restrained against excessive vertical and horizontal movement during a seismic event by the use of 2-axis resilient snubbers, designed to withstand the project required seismic forces. A minimum of four (4) snubbers are to be used at each equipment installation, oriented to effectively restrain the isolated equipment in all three directions. 2. Snubbers shall be of welded steel construction and shall be attached to the equipment structure and e3quipment in a manner consistent with anticipated design loads. Snubbers shall limit lateral and vertical equipment movement at each snubber location to a maximum of ¼ (6 mm) in any direction. 3. Snubbers shall include resilient neoprene pads with a mnimum thickness of ¼ (6 mm) to cushion any impact and to avoid any potential for metal-to-metal contact. Snubber shall be installed only after the isolated equipment is mounted, piped, and operating so as to ensure that no contact occurs during normal equipment operation. H. Single-Axis External Seismic Snubber Assembly 1. Equipment shall be restrained against excessive horizontal one-axis movement during a seismic event by the use of single-axis resilient snubbers, designed to withstand the project required seismic forces. A minimum of four (4) snubbers are to be used at each equipment installation, oriented to effectively restrain the isolated equipment in all lateral directions. 2. Snubbers shall be of welded steel construction and shall be attached to the equipment structure and equipment in a manner consistent with anticipated design loads. Snubbers shall limit lateral equipment movement at each snubber location in the direction of impact to a maximum of ¼ (6 mm). 3. Snubbers shall include resilient neoprene pads with a minimum thickness of ¼ (6 mm) to cushion any impact and to avoid any potential for metal-to-metal contact. Snubber shall be installed only after the isolated equipment is mounted, piped, and oprating so as to eliminate any contact during normal equipment operation. I. Cable Restraints For Suspended Equipment BP2 Addendum No

7 1. Seismic wire rope cable restraints shall consist of steel wire strand cables, sized to resist seismic loads, arranged so to offer seismic restraint capabilities for suspended equipment in all lateral directions. 2. End connection fittings shall be designed to swivel in order to ensure proper cable alignment and to avoid bending of rope. Protective thimbles shall be used at connection points so to eliminate bending cable across sharp edges. 3. Anchoring hardware at each end of the cable shall be designed so to exceed the working project design load of the wire cable by a minimum of 50 percent. J. Coil Spring Isolator Incorporated Within a Ductile Iron or Cast Aluminum Housing PART 3 EXECUTION 3.01 SEISMIC-RESTRAINT 1. Cast iron or aluminum housing are brittle when subjected to shock loading and are therefore not approved for seismic restraint applications. A. Comply with ASHRAE 1 for installation requirements, except as specified in this Article. B. Install seismic-restraint components per manufacturer s written instructions using methods approved by the evaluation service providing required submittals for component. C. Strength of Seismic-Restraint Assemblies: Where not indicated, select sizes of components so strength will be adequate to carry present and future static and seismic loads within specified loading limits. Minimum static design load used for strength determination shall be weight of supported components plus 200 lb. (90kg). D. Mounting and Anchorage of Surface-Mounted Equipment and Components: Anchor and fasten mechanical items and their supports to building structural elements by the methods specified in their individual specification sections RESTRAINT OF MECHANICAL EQUIPMENT AND SYSTEMS A. Provide seismic and wind restraints for all mechanical equipment including but not limited to: 1. A/C Units 2. Air Distribution Boxes and Air Valves 3. Rooftop Units 4. Air Separators 5. Cabinet Heaters 6. Self Contained A/C Units 7. Condensing Units 8. Ductwork 9. Fans (all types) 10. Piping 11. Tanks (all types) BP2 Addendum No

8 3.03 INSPECTION A. the Contractor shall notify the local representative of the seismic and wind restraint materials manufacturer prior to installing any seismic restraint devices. The Contractor shall seek the representative s guidance in any installation procedures with which he is unfamiliar. B. The local representative of the seismic and wind restraint materials manufacturer shall conduct periodic insptections of the installation of the materials herein specified, and shall report in writing to the Contractor any deviations from good installation practice observed. C. Upon completion of the installation of all seismic and wind restraint devices herein specified, the local representative of the seismic restraint manufacturer shall inspect the completed system and report in writing any installation errors, improperly selected devices, or other fault in the system which could affect the performance of the system. D. The Installing Contractor shall submit a report upon request to the building owner or his representative, including the manufacturer s representative s final report, indicating that all seismic and wind restraint material has been properly installed, or steps to be taken by the Contractor to properly complete the seismic restraint work as per the specifications ACCOMMMODATION OF DIFFERENTIAL SEISMIC MOTION A. Make flexible connections in runs of piping, ductwork, etc. where they cross expansion and seismic-control joints, where adjacent sections or branches are supported by different structural elements, and where they terminate with connection to mechanical equipment that is anchored to a different structural element from the one supporting them as they approach equipment FIELD QUALITY CONTROL A. Testing Agency: Engage a qualified independent testing and inspecting agency to perform field tests and inspections and prepare test reports. B. Testing: Test pullout resistance of seismic anchorage devices. 1. Provide evidence of recent calibration of test equipment by a testing agency acceptable to authorities having jurisdiction. 2. Schedule test with Construction Manager before connection anchorage device to restrained component (unless postconnection testing has been approved), and with at least seven days advance notice. 3. Obtain Construction Manager s approval before transmitting test loads to structure. Provide temporary load-spreading members. 4. Test at least four of each type and size of installed anchors and fasteners selected by Construction Manager. 5. Test to 90 percent of rated proof load of device. 6. If a device fails test, modify all installations of same type and retest until satisfactory results are achieved. BP2 Addendum No

9 C. Record test results. End of Section BP2 Addendum No