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<br />RFP 24-057 <br /> <br />587 -0702 <br /> <br />Field butt joints, when needed, will be made at locations at least 12 inches from any <br />increasing or decreasing cross-section of duct where the duct to be jointed has the <br />same diameter. All bolts, nuts, washers, and gaskets required for all connections of <br />the ductwork system, including connections to equipment, will be provided. <br /> <br />B. Transitions: Fiberglass reinforced plastic transition sections will be furnished for <br />connecting round duct to rectangular openings on equipment. Transitions will have <br />a pressure rating and wall stiffness equal to that of the duct. Internal lining will be of <br />the same type of material and thickness as specified for the dud. Transitions will <br />have flanged end connections compatible with the connecting duct and equipment. <br />Transitions will be constructed to provide for draining condensate in the direction of <br />the airflow. <br /> <br />C. <br /> <br />Expansion Joints: Expansion joints will be furnished and installed at locations <br />required for proper duct installation. Expansion joints will be resistant to ultraviolet <br />light and will be suitable for the service conditions. All expansion joint materials in <br />contact with the foul air will be manufactured of EPDM or other materials suitable <br />for sustained contact in wet hydrogen sulfide concentrations of up to 200 parts per <br />million and dilute sulfuric acid. The duct manufacturer will be responsible for <br />selecting locations and quantities of expansion joints based on the longitudinal <br />and lateral movement capability of the specific expansion joint product selected. <br /> <br />Expansion joints will be slip-on type, as manufactured by Red Valve Co., Inc., or <br />approved equivalent. The slip-on type will be sized to fit tightly on the outside <br />diameter of the duct and will be secured in place by adjustable, corrosion-resistant <br />stainless steel band type clamps. <br /> <br />2.03 PIPE SUPPORTS <br /> <br />Duct supports shall be spaced at a maximum of 20 feet. Duct support spacings greater <br />than 20 feet may be considered by CITY or CITY'S representative if modifications are <br />made to anchor bolts and to concrete support pads at no additional cost to CITY. Duct <br />support spacings will be shown on the shop drawings. All ductwork, guides, and <br />anchors supplied by manufacturer will be capable of withstanding a 100-mile per hour <br />lateral wind load, and will be capable of withstanding a 200 pound concentrated vertical <br />load (applied over a 1 square foot bearing area) at mid-span between any two supports. <br /> <br />PART 3 - EXECUTION <br /> <br />3.01 INSPECTION <br /> <br />General: The PROPONENT shall examine areas and conditions under which fiberglass <br />ductwork is to be installed. Do not proceed with work until unsatisfactory conditions have <br />been corrected in manner acceptable to the factory-certified installer. <br /> <br />15892-5 <br /> <br />I <br /> <br />I <br /> <br />I <br />