2.8 A. Preformed pipe Insulation: ASTM C533, Type I and Type II with indicator denoting asbestos-free material. B. Premolded Pipe Fitting Insulation: ASTM C533, Type I and Type II with indicator denoting asbestos-free material. C. Equipment Insulation: ASTM C533, Type I and Type II D. Characteristics: Insulation Characteristics TYPE I TYPE II Temperature, maximum degrees C (degrees F) 649 (1200) 927 (1700) Density (dry), Kg/m3 (lb/ ft3) 232 (14.5) 288 (18) Thermal conductivity: Min W/ m K (Btu in/h ft2 degrees F)@ mean temperature of 93 degrees C (200 degrees F) 0.059 (0.41) 0.078 (0.540) Surface burning characteristics: Flame spread Index, Maximum 0 0 Smoke Density index, Maximum 0 0 2.9 INSULATION FACINGS AND JACKETS A. Retarder, higher strength with low water permeance = 0.02 or less perm rating, Beach puncture 50 units for insulation facing on exposed ductwork, casings and equipment, and for pipe insulation jackets. Facings and jackets shall be all service type (ASJ) or PVDC Vapor Retarder jacketing. B. ASJ jacket shall be white kraft bonded to 0.025 mm (1 mil) thick aluminum foil, fiberglass reinforced, with pressure sensitive adhesive closure. Comply with ASTM C1136. Beach puncture 50 units, Suitable for painting without sizing. Jackets shall have minimum 40 mm (1-1/2 inch) lap on longitudinal joints and minimum 75 mm (3 inch) butt strip on end joints. Butt strip material shall be same as the jacket. Lap and butt strips shall be self-sealing type with factory-applied pressure sensitive adhesive.
a. Insulating and finishing cement for sizes less than 100 mm (4 inches) operating at surface temperature of 16 degrees C (61 degrees F) or more. b. Factory premolded, one piece PVC covers with mineral fiber, (Form B), inserts. Provide two insert layers for pipe temperatures below 4 degrees C (40 degrees F), or above 121 degrees C (250 degrees F). Secure first layer of insulation with twine. Seal seam edges with vapor barrier mastic and secure with fitting tape. c. Factory molded, ASTM C547 or field mitered sections, joined with adhesive or wired in place. For hot piping finish with a smoothing coat of finishing cement. For cold fittings, 16 degrees C (60 degrees F) or less, vapor seal with a layer of glass fitting tape imbedded between two 2 mm (1/16 inch) coats of vapor barrier mastic. d. Fitting tape shall extend over the adjacent pipe insulation and overlap on itself at least 50 mm (2 inches). 3. Nominal thickness in millimeters and inches specified in the schedule at the end of this section. SPEC WRITER NOTE: Specify only cellular glass, polyisocyanurate (exterior only) or phenolic closed cell insulation for chilled water piping systems conveying fluids below ambient temperatures and/or where insulation for condensation control is specified. D. Rigid Cellular Phenolic Foam: 1. Rigid closed cell phenolic insulation may be provided for piping, ductwork and equipment for temperatures up to 121 degrees C (250 degrees F). 2. Note the NFPA 90A burning characteristics requirements of 25/50 in paragraph 1.3.B 3. Provide secure attachment facilities such as welding pins. 4. Apply insulation with joints tightly drawn together 5. Apply adhesives, coverings, neatly finished at fittings, and valves. 6. Final installation shall be smooth, tight, neatly finished at all edges. 7. Minimum thickness in millimeters (inches) specified in the schedule at the end of this section.
4-16 degrees C (40-60 degrees F) (CH, CHR, GC, GCR and RS for DX refrigeration) Rigid Cellular Phenolic Foam 38 (1.5) 38 (1.5) 38 (1.5) 38 (1.5) 4-16 degrees C (40-60 degrees F) (CH and CHR within chiller room and pipe chase and underground) Cellular Glass 50 (2.0) 50 (2.0) 75 (3.0) 75 (3.0) 4-16 degrees C (40-60 degrees F) (CH, CHR, GC, GCR and RS for DX refrigeration) Cellular Glass 38 (1.5) 38 (1.5) 38 (1.5) 38 (1.5) 4-16 degrees C (40-60 degrees F) (CH, CHR, GC and GCR underground) Closed-Cell Rigid 38 (1.5) 38 (1.5) 50 (2.0) 50 (2.0) 4-16 degrees C (40-60 degrees F) (CH, CHR, GC, GCR and RS for DX refrigeration) Closed-Cell Rigid (Exterior Locations only) 38 (1.5) 38 (1.5) 38 (1.5) 38 (1.5) (40-60 degrees F) (CH, CHR, GC, GCR and RS for DX refrigeration) Flexible Elastomeric Cellular Thermal (Above ground piping only) 38 (1.5) 38 (1.5) 38 (1.5) 38 (1.5) E N D