ACOUSTICAL INSULATION (LAGGING) FOR PIPING AND EQUIPMENT

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1 ACOUSTICAL INSULATION (LAGGING) FOR PIPING AND EQUIPMENT Specification for Acoustical Insulation (Lagging) for Piping and Equipment 1 of 5

2 TABLE OF CONTENTS 1.0SCOPE REFERENCED PUBLICATIONS GENERAL MATERIALS ABSORPTIVE LAYER APPLICATION (INSULATION) BARRIER LAYER APPLICATION FINISH APPLICATION IRREGULAR SURFACES FLASHING... 5 Specification for Acoustical Insulation (Lagging) for Piping and Equipment 2 of 5

3 1.0 SCOPE 1.1 This specification describes the materials for and the application of acoustical insulation (lagging) for piping and equipment in hot and cold services. 2.0 REFERENCED PUBLICATIONS The following publications (latest editions) form part of this specification: COMPANY Engineering Specifications Cold Piping and Equipment Insulation Hot Piping and Equipment Insulation 3.0 GENERAL 3.1 This specification requires compliance with all applicable federal, state, and local laws and regulations. 3.2 Piping and equipment that is specified to receive acoustical insulation shall be insulated in accordance with this specification and any additional project requirements. 3.3 All equipment that is to be insulated will be listed on the equipment insulation schedule along with the insulation type, material, and thickness. 3.4 All piping that is to be insulated will be listed on the line schedule along with the insulation type, material, and thickness. 3.5 General insulation requirements are covered in COMPANY Engineering Specification IC for cold service ( 225 F to +70 F) ( 143 C to +21C) installations and IH for hot service (+70 F to F) (+21 C to +649 C) installations. All requirements of COMPANY Engineering Specifications shall apply except any exceptions or variations stated in this specification shall take precedence where acoustical insulation is specified. 3.6 Reusable pad type insulation covers may be used for the services specified in COMPANY Engineering Specification, provided they are supplied with a noise barrier layer. 3.7 Only lead free materials shall be used. 4.0 MATERIALS 4.1 All materials shall conform to the requirements of COMPANY Engineering Specifications except as modified by this specification. 4.2 Absorptive layer materials shall be one of the following: a. Glass fiber with a minimum density of 3 lb/ft 3 (48 kg/m 3 ) of specified thickness. b. Mineral fiber with a minimum density of 8 lb/ft 3 (128 kg/m 3 ) of specified thickness. 4.3 Barrier layer materials shall be one of the following: a. Loaded vinyl sheeting, such as Soundmat PB by Soundcoat Co. or equal, of specified surface weight. b. Loaded mastic, such as Acousti Lag by RPR Products Inc. or equal, of specified surface weight. c. Loaded vinyl metal laminated sheeting of specified surface weight. 4.4 Laminates providing combinations of absorptive, barrier, or finish layers shall be one of the following: a. Loaded vinyl sheeting laminated to aluminum or stainless steel jacketing, such as Acousti Jac Aluminum or Acousti Jac SS by RPR Products Inc. or equal, of specified surface weight. 4.5 All materials shall be asbestos free. Specification for Acoustical Insulation (Lagging) for Piping and Equipment 3 of 5

4 5.0 ABSORPTIVE LAYER APPLICATION (Insulation) 5.1 For cold service ( 225 F to +70 F) ( 143 C to +21 C) installations, the complete thermal system (basic insulation material, coverings and coatings, and sealers) shall be applied before any acoustical absorptive material is applied. A vapor barrier shall be installed between the acoustical insulation and the outer jacketing. 5.2 For hot service (+70 F to F) (+21 C to +649 C) installations, the acoustic absorptive material shall be applied directly to the piping or equipment. 5.3 For installations where thermal insulation already exists, the acoustic absorptive layer shall be applied directly over the existing insulation without modification to the thermal system. 5.4 All surfaces (including valve bodies, flanges, fittings, etc.) on the equipment or length of duct or piping that is to be acoustically insulated shall be covered with the absorptive material. Hangers and other supports shall also be covered. 5.5 Absorptive insulation shall be applied with a snug, tight fit at all joints, longitudinal and circumferential. If a thickness of more than 2 inches (50mm) is specified, the insulation shall be applied in multiple layers, staggering all joints. All openings shall be packed with loose insulation using elastomeric adhesives. Insulating cements shall not be used. 5.6 Insulation shall be secured on piping and equipment with wire or bands as required by COMPANY Engineering Specification IC or IH Pins and clips shall not be used to secure the insulation. 5.7 Elbows shall be covered with either preformed or field cut insulation of the same material and thickness as the pipe insulation. For other items like flanges in the system, the same treatment shall be applied in the most efficient manner. 6.0 BARRIER LAYER APPLICATION 6.1 Sheet barrier materials shall be applied in a watershed fashion, and all joints of barrier material and absorptive material shall be staggered. Circumferential and longitudinal joints of sheet barrier material shall be overlapped a minimum of 3 inches (76mm). On horizontal joints of sheet barrier material and loaded mastics, the sheet material shall be extended a minimum of 3 inches (76mm) over the mastic. On vertical joints, the mastic shall extend 3 inches (76mm) over the sheet material to provide proper watershed. All sheet barrier materials shall be applied in an airtight, gapless fashion. 6.2 The continuity of the barrier layer shall not be broken. Where it is impossible to fit the entire specified thickness of absorptive and barrier layers, the thickness of the absorptive layer shall be decreased to allow clearance. 6.3 On loaded vinyl sheet barrier materials where an additional finish is to be applied, bands, wire, tape, or adhesive bonding are all acceptable means of attachment. On vinyl sheet barrier material applications, when these materials will act as the finish surface, wire or tape shall not be used for attachment. To ensure gapless joints on vinyl sheet applications, all joints shall be adhesively bonded. Sheet metal screws shall not be used on plain vinyl sheet barrier layer materials. VENDORS should be consulted for specific instructions and limitations for their products. 7.0 FINISH APPLICATION 7.1 The final finish jacketing shall be secured with bands only. Screws or rivets shall not be used. 7.2 Prefabricated metal elbows and other fittings shall be used whenever possible. Specification for Acoustical Insulation (Lagging) for Piping and Equipment 4 of 5

5 7.3 All longitudinal and circumferential seams shall be caulked. Cuts and openings for projections shall be made as tight as possible. All openings and seams shall be caulked with a nonhardening, nonshrinking type caulking compound. 7.4 There shall be no direct or indirect metalto metal contact of equipment or pipe walls with outer jacketing materials. The use of weld studs, weld pins, peg rivets, or similar devices which could couple the jacketing material to the equipment or piping walls is prohibited. The use of the insulation system shown in COMPANY Engineering Specification IH 1.0.0, Figure 6, is prohibited for acoustical insulation systems since it couples the jacketing to the vessel. 7.5 The outer jacketing material shall form a total enclosure around the piping and equipment. There shall be no leaks, voids, or openings in the jacketing material. 8.0 IRREGULAR SURFACES 8.1 All irregular surfaces receiving acoustical insulation shall be completely covered with absorptive insulation. The insulation shall be cut and fitted together to avoid gaps. All openings shall be packed with loose insulation using elastomeric adhesives. Insulating cements shall not be used. 8.3 A tack coat of mastic (approximately half of the desired film thickness) shall be applied with sufficient pressure to assure impregnation of the absorptive layer. Reinforcing fabric shall be embedded in the wet tack coat, and then the final coat shall be applied to the specified wet film thickness. Adjacent pieces of reinforcement shall be lapped a minimum of 3 inches (76mm). The installed reinforcing shall be free of wrinkles and protruding edges. In multiple coat applications, the reinforcing fabric shall be applied to the middle coating. 8.4 If the acoustical coating is used in conjunction with metal jacketing, the coating shall be overlapped at least 3 inches (76mm) by the jacketing and banded and caulked at the extreme end of the overlapping jacketing. 9.0 FLASHING 9.1 A 1/4 inch (6mm) bead of flashing compound shall be applied to all possible points of acoustic leakage or moisture penetration. These shall include any interruptions of the finish or barrier layer at joints or between finish or barrier layers and protrusions such as valve bonnets, hangers, and instrument connections. All joints that are to be broken in removing a removable cover shall also be flashed. 8.2 Trowelable acoustical coatings, such as loaded mastic, shall be applied directly to the absorptive insulation and reinforced with glass cloth. The coating shall have a minimum dry film thickness of 0.07 inch (1.8mm) and a minimum surface weight of 0.72 lb/ft 2 (3.6 kg/m 2 ). The Noise Reduction Coefficient (NRC) of the loaded mastic is available from the VENDOR. Specification for Acoustical Insulation (Lagging) for Piping and Equipment 5 of 5

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