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a <br /> 3.07 INSTALLATION OF DUCTWORK INSULATION <br /> A. General: Install insulation products in accordance with manufacturer's written instructions,and in accordance with <br /> recognized industry practices to ensure that insulation serves its intended purpose. <br /> B. Install insulation materials with smooth and even surfaces. <br /> C. Clean and dry ductwork prior to insulating. Butt insulation joints firmly together to ensure complete and tight fit <br /> over surfaces to be covered. <br /> D. Maintain integrity of vapor-barrier on ductwork insulation,and protect it to prevent puncture and other damage. <br /> E. Extend ductwork insulation without intenuption through walls, floors and similar ductwork penetrations, except <br /> where otherwise indicated <br /> F. Lined Ductwork: Except as otherwise indicated, omit insulation on ductwork where internal insulation or sound <br /> absorbing linings have been installed. <br /> G. Corner Angles: Except for oven and hood exhaust duct insulation, install corner angles on external corners of <br /> insulation on ductwork in exposed finished spaces before covering with jacketing. <br /> 3.08 INSTALLATION OF EQUIPMENT INSULATION <br /> A. General: Install equipment thermal insulation products in accordance with manufacturer's written instructions, and <br /> in compliance with recognized industry practices to ensure that insulation serves intended purpose. ' <br /> B. Install insulation materials with smooth and even surfaces and on clean and dry surfaces. Redo poorly fitted joints. <br /> Do not use mastic or joint sealer as filler for gapping joints and excessive voids resulting from poor workmanship. <br /> C. Maintain integrity of vapor-barrier on equipment insulation and protect it to prevent puncture and other damage. <br /> D. Do not apply insulation to equipment,breechings,or stacks while hot. <br /> E. Apply insulation using staggered joint method for both single and double layer construction,where feasible. Apply <br /> each layer of insulation separately. <br /> F. Coat insulated surfaces with layer of insulating cement, troweled in workmanlike manner, leaving smooth <br /> continuous surface. Fill in scored block, seams, chipped edges and depressions, and cover over wire netting and <br /> joints with cement of sufficient thickness to remove surface irregularities. <br /> G. Cover insulated surfaces with all-service jacketing neatly fitted and firmly secured Lap seams at least 2". Apply <br /> over vapor barrier where applicable. <br /> H. Do not insulate boiler manholes,handholes,cleanouts,ASME stamp,and manufacturer's nameplate. Provide neatly <br /> beveled edge at intemiptions of insulation. <br /> I. Provide removable insulation sections to cover parts of equipment which must be opened periodically for <br /> maintenance;include metal vessel covers,fasteners,flanges,fiames and accessories. <br /> END OF SECTION 15250 <br /> 15250-8 No.99132-CP2 <br /> �I <br />