B. Flexible Mineral Fiber Blanket: 1. Adhere insulation to metal with 75 mm (3 inch) wide strips of insulation bonding adhesive at 200 mm (8 inches) on center all around duct. Additionally secure insulation to bottom of ducts exceeding 600 mm (24 inches) in width with pins welded or adhered on 450 mm (18 inch) centers. Secure washers on pins. Butt insulation edges and seal joints with laps and butt strips. Staples may be used to assist in securing insulation. Seal all vapor retarder penetrations with mastic. Sagging duct insulation will not be acceptable. Install firestop duct insulation where required. 2. Supply air ductwork to be insulated includes main and branch ducts from AHU discharge to room supply outlets, and the bodies of ceiling outlets to prevent condensation. Insulate sound attenuator units, coil casings and damper frames. To prevent condensation insulate trapeze type supports and angle iron hangers for flat oval ducts that are in direct contact with metal duct. 3. Concealed supply air ductwork. a. Above ceilings at a roof level, in attics, and duct work exposed to outdoor weather: 50 mm (2 inch) thick insulation faced with FSK. b. Above ceilings for other than roof level: 40 mm (1 ½ inch) thick insulation faced with FSK. 4. Concealed return air duct: a. //In attics (where not subject to damage) and where exposed to outdoor weather: 50mmm (2 inch)thick insulation faced with FSK, // b. Above ceilings at a roof level, unconditioned areas, and in chases with external wall or containing steam piping; 40 mm inch) thick, insulation faced with FSK. //c. In interstitial spaces (where not subject to damage): 40 mm inch thick insulation faced with FSK. // d. Concealed return air ductwork in other locations need not be insulated. 5. Concealed outside air duct: 40 mm (1-1/2 inch) thick insulation faced with FSK. 6. Exhaust air branch duct from autopsy refrigerator to main duct: 40 mm (1-1/2 inch) thick insulation faced with FSK. C. Molded Mineral Fiber Pipe and Tubing Covering:
3.8 PIPE INSULATION SCHEDULE Provide insulation for piping systems as scheduled below: SPEC WRITER NOTE: Insulate vent piping for PRV safety valves, receivers and flash tanks where protection to personnel is required. Insulation Thickness Millimeters (Inches) Nominal Pipe Size Millimeters (Inches) Operating Temperature Range/Service Insulation Material Less than 25 (1) 25 – 32 (1 – 1¼) 38 – 75 (1½ - 3) 100 (4) and Above 122-177 degrees C (251-350 degrees F) (HPS, MPS) Mineral Fiber (Above ground piping only) 75 (3) 100 (4) 113 (4.5) 113 (4.5) 93-260 degrees C (200-500 degrees F) (HPS, HPR) Calcium Silicate 100 (4) 125 (5) 150 (6) 150 (6) 100-121 degrees C (212-250 degrees F) (HPR, MPR, LPS, vent piping from PRV Safety Valves, Condensate receivers and flash tanks) Mineral Fiber (Above ground piping only) 62 (2.5) 62 (2.5) 75 (3.0) 75 (3.0) 100-121 degrees C (212-250 degrees F) (HPR, MPR, LPS, vent piping from PRV Safety Valves, Condensate receivers and flash tanks) Rigid Cellular Phenolic Foam 50 (2.0) 50 (2.0) 75 (3.0) 75 (3.0) 38-94 degrees C (100-200 degrees F) (LPR, PC, HWH, HWHR, GH and GHR) Mineral Fiber (Above ground piping only) 38 (1.5) 38 (1.5) 50 (2.0) 50 (2.0) 38-99 degrees C (100-211 degrees F) Rigid Cellular Phenolic Foam 38 (1.5) 38 (1.5) 50 (2.0) 50 (2.0)
(LPR, PC, HWH, HWHR, GH and GHR) 39-99 degrees C (100-211 degrees F) (LPR, PC, HWH, HWHR, GH and GHR) Closed-Cell Rigid (Exterior Locations only) 38 (1.5) 38 (1.5) ---- ---- 38-94 degrees C (100-200 degrees F) (LPR, PC, HWH, HWHR, GH and GHR) Flexible Elastomeric Cellular Thermal (Above ground piping only) 38 (1.5) 38 (1.5) ---- ---- 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 (where 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 Flexible Elastomeric Cellular 38 (1.5) 38 (1.5) 38 (1.5) 38 (1.5)