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I <br /> I <br /> j il <br /> I � <br />' ; � MECHANICAL SYSTEM INSULATION <br /> , � � SECTIOfV 15250 <br /> , <br /> li <br /> � Refrigerant Suction All IPS 1 inch thick <br /> L'ines&Valves(in Type A <br /> plenums or firewall or <br /> floor penetrations) <br /> t <br /> , <br /> Domestic Hot Water, 2 inch IPS 1 inch thick <br /> Tempered Water, or less Type A <br /> Recirculated Hot Water <br /> and Service Hot Water <br /> � � <br /> , Domestic Hot Water, 2-1/2 inch 1-1/2 inch thick <br /> Tempered Water, IPS or Type A <br /> iRecirculated Hot Water greater <br /> � and Service Hot Water <br /> ; ; i <br /> L�ow Pressure Supply& All 2 inch thick <br /> ' Return Ducts(in Type F with Foil/ <br /> concealed areas) Scrim/Kraft Facing <br /> See Note B <br /> ' Notes: <br /> � <br /> i4. Outdoor air, ventilating and exhaust ductwork shall not be insulated, unless otherwise <br /> noted on the Drawings or in Section 15890 of these specifications. <br /> B. Exposed low pressure ductwork shall be double wall, internally lined. Refer to Section <br /> � 15890 for additional requirements. <br /> � <br /> � ;C. Low pressure supply ducfinrork at the discharge of the fan for air handling units shall be <br /> � internally lined with 1 inch thick ductliner. Refer to Section 15800 for additional <br /> , requirements. <br /> � ; <br /> jD. All supply, return and ventilating ductwork(except pre-insulated round ductwork)within 20 <br /> ;' � feet of the air handling unit or fan connection shall be lined with 1/2 inch thick ductliner <br /> i <br /> board for acoustic purposes, if not lined urider 2,3 or 4 above. <br /> I <br /> , 3.2 !FIPING, INSULATION, GENERAL REQUIREMENTS <br /> I �i. Preparation <br /> � <br /> � 1. Do not apply insulation until piping has been leak tested. <br /> i 2. All surfaces to be insulated shall be dry and free of loose scale, rust,dirt,oil or water. <br /> I <br /> �B. Application <br /> 1. Insulation shall be installed in a smooth, clean workmanlike manner. Joints shall be <br /> tight and finished smooth without fishmouths. <br /> 2. Insulation shall fit tightly against the surface to which it is applied to prevent air <br /> circulation befinreen the insulation and the pipe or equipment to which it is applied. <br /> � <br /> (97008-040497) 15250-6 <br /> � II <br /> � <br /> ' i � <br />