Division 22 23 Ebook Page 212 Section 22 07 19 Plumbing Piping Insulation-Fiberglasí Insulation

PLUMBING PIPING INSULATION 22 07 19 - 5 Plumbing Piping Insulation - FIBERGLAS Insulation 3.4 INSTALLATION A. General: Install insulation materials and accessories in accordance with Contract Documents and manufacturer's published instructions to ensure that it will serve its intended purpose. 1. Install insulation on piping subsequent to painting and acceptance tests. 2. Install insulation materials with smooth and even surfaces. Insulate each continuous run of piping with full-length units of insulation, with single cut piece to complete run. Do not use cut pieces or scraps abutting each other. Butt insulation joints firmly to ensure complete, tight fit over piping surfaces. 3. Maintain the integrity of factory-applied vapor retarder jacketing on pipe insulation, protecting it against puncture, tears or other damage. Seal circumferential joints with butt strips that are compatible with ASJ Max facing. Stapling is not required to complete the closure. 4. On cold systems, seal penetrations of the ASJ Max and exposed ends of insulation with vapor barrier mastic. Coat staples used on cold pipe insulation with suitable sealant to maintain vapor barrier integrity. Mastic pipe section ends at every fourth pipe section joint and at each fitting to provide isolation of water incursion. If humidities in excess of 90% are expected, the ASJ Max shall be protected with either a mastic coating or a suitable vapor retarding outer jacket. 5. When multiple layers are required, all inner layer(s) shall be No Wrap. B. Support piping so that the insulation is not compromised by the hanger or the effects of the hanger. Provide hanger spacing so that the circumferential joint may be made outside the hanger. Cover the evaporating holes with sealing tape for the length of the metal saddle. 1. Piping systems 3 in (75 mm) in diameter or less, insulated with fiberglass pipe insulation, may be supported by placing saddles of the proper length and spacing under the insulation. 2. For hot or cold piping systems larger than 3 in (75 mm) in diameter, operating at temperatures less than +200F (93C) and insulated with fiberglass, provide inserts such as foam or high-density fiberglass with sufficient compressive strength to support the weight of the piping system. 3. At vertical runs, provide insulation support rings, as indicated on Drawings. C. Fittings: 1. Cover valves, fittings, and similar items in each piping system using one of the following: a. Mitered sections of insulation equivalent in thickness and composition to that installed on straight pipe runs. b. Insulation cement, equal in thickness to the adjoining insulation. c. PVC Fitting Covers insulated with material equal in thickness and composition to adjoining insulation. 2. Seal fitting joints with vapor retarder sealing tapes or mastics. 3. Use standard oversizing practices for valves and flanges. D. Penetrations: Extend piping insulation without interruption through walls, floors and similar piping penetrations, except where otherwise specified. E. Joints: Butt pipe insulation against hanger inserts. For hot pipes, stagger joints when operating temperature is over 400F (204C) double layer. Seal jacketing according to type being used. Seal self- sealing laps by firmly rubbing down surface of tape and flap. 1. Taper and seal pipe insulation ends, regardless of service. F. Vertical Piping: Protect vertical piping to a height of 8 ft -0 in (2.4 m) above the floor. Jacket insulated, exposed vertical piping within the building and insulated piping exposed to the outdoors with minimum 0.016 in thick (0.4 mm) aluminum.

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