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� � I <br /> � <br /> II � <br /> ; � MECHANICAL SYSTEM INSULATION <br /> SECTION 15250 <br /> '� � i <br /> ' I <br /> I D�. Hot Piping <br /> � � <br /> ! � 1. Cover valves,fittings and flanges with insulation similar to the adjacent pipe covering, �I <br /> � i securing in place with galvanized wire loops, twisting ends and embedding in <br /> �Ii insulation. Apply a PVC jacket and tape end joints to adjacent pipe insulation. <br /> � � i <br /> � I � 2. Do not use PVC fitting jackets where the surtace of the insulation is above 150 <br /> i ; I degrees F. <br /> j E� Exterior Piping <br /> j , I <br /> 1. Exterior above grade water piping shall be finished with a weatherproof jacket and an <br /> I � � aluminum jacket. Lap and seal joints as per manufacturer's instructions. Place laps to <br /> � � � shed water. <br /> ' 3.4 TYPE B INSULATION INSTALLATION <br /> A. Type B insulation shall be slipped on the pipe prior to connection, and the butt joints shall <br /> be sealed. Where the slip-on techniques is not possible, the insulation shall be carefully <br /> I, slit and applied to the pipe. <br /> il <br /> i. All joints shall be sealed with the manufacturer's recommended adhesive. <br /> C. Do not apply Type B insulation in multiple layers. <br /> � <br /> '� �D. Type B insulation shall not be used in plenums nor fire wall penetrations. <br /> �� I � <br /> i E. This Contractor shall paint Type B insulation exterior to the building with finro coats of a <br /> � i vinyl lacquer paint recommended by the insulation manufacturer for protection against <br /> j i � ultraviolet degradation and shall be flexible with no cracking. <br /> � 3.5 �HANGERS <br /> �i � I <br /> I �i. Continue insulation through pipe hangers. Provide either rigid insulation inserts or sheet <br /> ' metal inserts at all outside pipe hangers. Provide rigid insulation inserts for piping <br /> '� i � operating below 60 degrees F. and sheet metal inserts for piping above 60 degrees F. <br /> � <br /> ,� i <br /> B. Rigid insulation or wood inserts befinreen the pipe and pipe hanger shall be of a thickness <br /> � I i equal to the adjoining insulation and shall be provided with vapor barrier where required. <br /> � i Insulation insert shall not be less than the following lengths: <br /> � <br /> i � 1/2"to 2-1/2"pipe size 10 Inches Long <br /> j 3"to 6"pipe size 12 Inches Long <br /> � 8"to 10"pipe size 16 Inches Long <br /> ; 12"and over 22 Inches Long <br /> I <br /> ; �C. Inserts for cold piping shall have a vapor barrier facing of the same material as the <br /> � � adjacent pipe insulation. Seal inserts into insulation with vapor seal mastic. <br />, D. Sheet metal inserts shall be of steel sheet. Gauge shall conform to manufacturer's <br /> recommendation for pipe size. Sheet metal inserts shall have insulation filler of the same <br /> material as the adjacent pipe insulation. <br /> ; (97008-040497) 15250-8 <br /> I � i <br /> � <br /> � i <br /> � il <br />