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DocuSign Envelope ID: 9826C043- 4C32- 49CD- A4CC- DC28ABAB7CE7 <br />SECTION 237700 - VIBRATION AND SEISMIC CONTROLS FOR HVAC <br />PART 3 - EXECUTION <br />3.1 APPLICATIONS <br />A. Multiple Pipe Supports: Secure pipes to trapeze member with clamps approved for application by an agency <br />acceptable to authorities having jurisdiction. <br />B. Hanger Rod Stiffeners: Install hanger rod stiffeners where indicated or scheduled on Delegated Design <br />Drawings to receive them and where required to prevent buckling of hanger rods due to seismic forces. <br />C. Strength of Support and Seismic - Restraint Assemblies: Where not indicated, select sizes of components so <br />strength will be adequate to carry present and future static and seismic loads within specified loading limits. <br />3.2 VIBRATION- CONTROL AND SEISMIC - RESTRAINT DEVICE INSTALLATION <br />A. Equipment Restraints: <br />1. Install resilient bolt isolation washers on equipment anchor bolts where clearance between anchor and <br />adjacent surface exceeds 0.125 inches. <br />2. Install seismic - restraint devices using methods approved by an agency acceptable to authorities <br />having jurisdiction providing required submittals for component. <br />B. Piping Restraints: <br />1. Comply with requirements in MSS SP -127. <br />C. Install cables so they do not bend across edges of adjacent equipment or building structure. <br />D. Install seismic - restraint devices using methods approved by an agency acceptable to authorities having <br />jurisdiction providing required submittals for component. <br />E. Install bushing assemblies for anchor bolts for floor- mounted equipment, arranged to provide resilient media <br />between anchor bolt and mounting hole in concrete base. <br />F. Attachment to Structure: If specific attachment is not indicated, anchor bracing to structure at flanges of <br />beams, at upper truss chords of bar joists, or at concrete members. <br />G. Drilled -in Anchors: <br />1. Identify position of reinforcing steel and other embedded items prior to drilling holes for anchors. Do <br />not damage existing reinforcing or embedded items during coring or drilling. Notify the structural <br />engineer if reinforcing steel or other embedded items are encountered during drilling. Locate and <br />avoid prestressed tendons, electrical and telecommunications conduit, and gas lines. <br />2. Do not drill holes in concrete or masonry until concrete, mortar, or grout has achieved full design <br />strength. <br />3. Wedge Anchors: Protect threads from damage during anchor installation. Heavy -duty sleeve anchors <br />shall be installed with sleeve fully engaged in the structural element to which anchor is to be fastened. <br />4. Set anchors to manufacturer's recommended torque, using a torque wrench. <br />5. Install zinc - coated steel anchors for interior and stainless steel anchors for exterior applications. <br />3.3 ACCOMMODATION OF DIFFERENTIAL SEISMIC MOTION <br />A. Install flexible connections in piping where they cross seismic joints, where adjacent sections or branches are <br />supported by different structural elements, and where the connections terminate with connection to equipment <br />that is anchored to a different structural element from the one supporting the connections as they approach <br />equipment. Comply with requirements in Division 22 Section "Domestic Water Piping" for piping flexible <br />connections. <br />Reece, Noland & McElrath, Inc. 237700-2 Orange County Board of Elections <br />Orange Co., NC 05/04/18 <br />