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.
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.
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