SECTION VIBRATION ISOLATION

Transcription

1 SECTION VIBRATION ISOLATION PART 1 - GENERAL 1.1 DESCRIPTION OF WORK A. Provide vibration isolators for mechanical equipment to prevent the transmission of vibration forces and structure transmitted sound to the building structure as indicated on the Drawings and as specified herein. Include adjustments of each mounting system. Provide specific mounting arrangements for each item of mechanical and plumbing equipment as described herein, and as indicated by details on the Drawings. B. Unless prior written approval of the Owner s Representative is obtained, all vibration isolation hardware and systems specified hereinafter shall be furnished by a single vibration isolation manufacturer. C. Vibration Isolated systems, equipment or parts that vibrate or generate noise unduly while in operation shall be adjusted, repaired or replaced as appropriate to obtain acceptable level of vibration or noise. 1.2 SUBMITTALS A. Submit for approval prior to installation of equipment: 1. Manufacturer's model number and type of each isolator, the identification mark for equipment or pipeline to which it is to be applied, and the number of isolators to be furnished for each equipment or pipeline. 2. For Steel Spring Mounts or Hangers: Free height minimum static deflection, deflected height, solid height, actual loading, diameter of spring coil, the ratio of spring height under actual load to spring diameter and structural calculations showing the capability of isolators to support load. 3. For Neoprene Isolators: Free height minimum static deflection, deflected height and actual loading. 4. Dimensional and weight data for concrete inertia bases, steel and rail bases, and details of isolator attachment. 5. Certification from isolation manufacturer that isolation is installed according to manufacturer's printed instructions and as specified. 1.3 VIBRATION ISOLATORS A. Provide vibration isolators for all equipment pre-purchased and furnished by the Owner. Coordinate the type, size and quantity of isolators and restraints with the equipment manufacturer and ensure prompt delivery prior to installation. GMP-R1 Addendum # Randall Stout Architects, Inc.

2 PART 2 - PRODUCTS 2.1 MANUFACTURERS A. Mason. B. Kinetics. C. Vibrex. D. Amber/Booth 2.2 MATERIALS A. General B. Bases 1. Provide vibration isolators in accordance with the load distribution to produce uniform minimum deflection as specified on the schedule. 2. All metal parts of vibration isolation hardware installed exterior to the building and exposed to the outdoor environment shall be galvanized or neoprene coated. 3. Where specific type of vibration isolation hardware equipment is not shown or specified, furnish isolators recommended by the isolation manufacturer compatible with equipment arrangements shown. 1. Base Type SRB (Steel Rail Base): Base shall be for equipment having legs or bases that do not require a complete supplementary base. Members to be rigid to prevent twist, rack, deform or deflect in any manner that will generate stress in the equipment, or degrade the performance of isolation mount. 2. Base Type SB (Integral Structural Steel Base): Provide rectangular bases for all equipment as specified on mechanical drawings and schedule. All perimeter members shall be beams with a minimum depth equal to 1/10th of the longest span between mounting supports but not more than 12". Employ height saving brackets, as needed, to provide a base clearance of 1 inch. Bases shall be Mason Type "WFSL," Kinetics "SFB," or approved equal. 3. Base Type IB (Inertia Base): Inertia bases shall be of welded steel construction with grout in-fill and shall incorporate prelocated equipment anchor bolts and pipe sleeves, No. 4 reinforcing bars, welded 6" on center each way. Inertia bases for pumps shall be of sufficient size to accommodate supports for pipe elbows at pump suction and discharge connections. The weight of each inertia base shall be at least equal to the weight of the equipment mounted thereon. Inertia bases shall be a minimum of 4" thick. Height-saving brackets or welded steel pockets shall be incorporated to ensure a 2" minimum clearance under each inertia base. C. Mount Types 1. Mount Type NS (Neoprene Sandwich Pad): Sandwich pad type mounting with minimum 0.25 thick ribbed or waffled neoprene pad bonded to each side of a 16 gauge plate. Isolator pads shall be selected for less than 80% maximum rated load. Isolators shall be Mason Type WSW, Kinetics NG or approved equal. GMP-R1 Addendum # Randall Stout Architects, Inc.

3 2. Mount Type NM ( Neoprene Mounting): Double deflection neoprene mounting sized for a static deflection under load in the range of inch. All metal surfaces shall be neoprene covered to avoid corrosion and have friction pads both top and bottom so they need not be bolted to the floor. Provide bolt holes for those areas where bolting is required. Isolators shall be Mason Type, "ND," Kinetics "RD" or approved equal. 3. Mount Type FS (Freestanding Springs): Provide freestanding and laterally stable spring isolators without any housing and complete with 1/4-inch neoprene acoustical friction pads between the baseplate and the support. Provide all mountings with leveling bolts, rigidly bolted to the equipment. Isolators shall be Mason Type "SLF," Kinetics "FDS," or approved equal. 4. Mount Type HSL (Housed Spring Mounting with Limit Stop): Springs in housings shall be as specified for Isolator Type FS. Provide housing with vertical resilient limit stops to prevent spring extension when weight is removed, as when equipment is drained. The housing shall serve as blocking during erection and the installed and operating to be the same. A minimum clearance of 1/2-inch shall be maintained around restraining bolts and between the housing and the spring so as not to interfere with the spring action. Limit stops shall be out of contact during normal operation. Mountings used outside shall be hot dipped galvanized. Isolators shall be Mason Type "SLR," Kinetics "FLS" or approved equal. 5. Mount Type VH1 (Vibration Hanger): Vibration hanger to contain a steel spring and 0.3- inch deflection neoprene element in series. The neoprene element shall be molded with a rod isolation bushing that passes through the hanger box. Provide spring diameters and hanger box lower hold sizes large enough to permit the hanger rod to swing through a 30 degree arc before contracting the hold and short circuiting the spring. Isolators shall be Mason Type "30N," Kinetics "SRH" or approved equal. 6. Mount Type VH2 (Vibration Hanger): Vibration hanger shall be as specified for Type 4, but pre-compressed to the rated deflection so as to keep the piping or equipment at a fixed elevation during installation. Design the hangers with a release mechanism to free the spring after the installation is complete and the hanger is subjected to its full load. Clearly indicate deflection by means of a measuring device. Isolators shall be Mason Type "PC30N," Kinetics "PSRH," or approved equal. 7. Mount Type VH3 (Vibration Hanger): Hanger to be a double deflection neoprene-inshear, sized for a static deflection under loads of 0.25 to 0.35-inch. Isolators shall be Mason Type "HD," or "WHD," Kinetics "RH," or approved equal. D. Isolation of Piping Systems 1. Drain connections from isolated equipment to floor drains shall have least 1-inch air gap above from drain. 2. Suspend all metal piping which connects to resiliently mounted equipment (chillers, boilers, clean steam generator and pumps) with resilient hangers or supported by floor mounted isolators for 50 feet distance from connected vibration-isolated equipment unless detailed otherwise on the Drawings. The first three supports from the connected machine to have the same static deflection as indicated for the machine. The remaining supports to have static deflection at least equal to one-half of the static deflection indicated for the machine mounting. GMP-R1 Addendum # Randall Stout Architects, Inc.

4 3. The first three supports from the connected machine are to have the same static deflection as indicated for the machine. The remaining supports to have static deflection at least equal to one-half of the static deflection indicated for the machine mounting. 4. Where static deflection in excess of 0.35 inches is required, the first three floor isolators shall be Type HSL and the first three isolation hangers shall be Type VH2. The remaining floor isolators shall be Type FS and the remaining isolation hangers shall be Type VH1. Where deflection of less than 0.35 inches is required, floor isolators shall be Type NM and isolation hangers to be Type VH3. 5. Flexible Connections a. Use flexible neoprene connectors to connect all piping to all isolated equipment, except equipment for which flexible connectors are not permitted by codes listed in Section b. Connectors to be manufactured of multiple plys of nylon tire cord fabric and neoprene, both molded and cured in hydraulic presses. Use no steel wire or rings as pressure reinforcement. General use connectors shall be Mason Types MFNEC or MFTFU, Metraflex Twin Sphere or EL Sphere or approved equal. Connectors up to, and including, 2-inch diameter may have threaded ends. Connectors 2-1/2 inches and larger shall be manufactured with floating steel flanges. Rate connections to a minimum of 150 psi at 220 degrees F. Flanged equipment shall be directly connected to neoprene elbows in the size range 1-1/2 through 6 inches or any larger available size if the piping make a 90 degree turn at the equipment. Make all straight through connections with either flanged or screwed connectors pre-extended as recommended by the manufacturer to prevent additional elongation under pressure. E. Isolation of Fractional Horsepower Equipment: Isolate all fractional horsepower fans, pumps, and equipment which are mounted on or suspended from floors that are not on-grade with neoprene-in-shear isolators as specified except where such isolators are furnished as an integral part of the machine. F. Electrical Connections to Resiliently Mounted Equipment: Make electrical connections to equipment which is supported or suspended by vibration isolators with long lengths of flexible steel conduit or flexible armored cable. Locate these flexible connections so as to prevent rigid connections between the resiliently mounted equipment and the building structure. PART 3 - EXECUTION 3.1 INSTALLATION A. Install resilient hangers a minimum of 2 below, but s near as possible to the supporting overhead structure. Locate the machine suspension points in a rigid and heavy portion of the building structure. Suspension of machines from lightweight floor slabs is not allowed. Hangers shall not touch structure. B. Attach suspension rods to rigid members of the machine structure. When such attachment points do not exist, furnish a heavy steel framework to support the machine with suspension rods attached to this framework. GMP-R1 Addendum # Randall Stout Architects, Inc.

5 3.2 FIELD QUALITY CONTROL A. Provide field inspection by qualified manufacturer's representative to ensure that all vibration isolators are installed in accordance with manufacturer's printed recommendations. B. Replace, as approved by the Owner s Representative, isolators that do not produce the required deflection, are inaccurately loaded above or below their correct operating height, or which do not produce the required isolation. 3.3 INSTALLATION OF FLOOR- AND ROOFTOP- MOUNTED EQUIPMENT A. Provide vibration isolation for base-mounted equipment as scheduled and per all instructions in this specification. B. Unless otherwise shown or specified, all base-mounted equipment shall be set on a minimum 4- inch thick, hardrock concrete housekeeping pads, depth of pad shall be increased as necessary to accommodate condensate drain trap requirements. Vibration isolators shall be bolted to the housekeeping pad. The pad dimensions shall exceed the equipment footprint (including floor mounts) by at least 24" in each direction (i.e. 12" per side). C. Unless otherwise indicated, a minimum clearance of 1 inch shall be provided between the top of a housekeeping pad or floor or roof and the underside of an equipment unit or steel base frame that is vibration-isolated. The minimum clearance where a concrete inertia block is used shall be 2" or 3% of the base's smaller dimension, whichever is larger. This space shall be cleaned thoroughly of all dirt and debris. D. For isolation equipment with neoprene pads bearing directly on structure, fasten the isolator base plates to the building structure with suitable bolts. Isolate steel bolts from steel base plates with neoprene bushings or washers and sleeves minimum 1/4 inch thick and maximum 40 durometer hardness. Provide steel washers to distribute bolt head loads to neoprene bushings or washers below. Size bolt holes in isolator bases to account for neoprene bushings or sleeves. E. All bases for pumps shall be of sufficient area to support any required pipe stanchions below pipe elbows. F. Bases for boilers shall be of sufficient area to support draft fans, if included. G. Fans and pumps and their respective motors shall always be mounted on a common base. H. Wind loads shall be accounted for in rooftop installations, including appropriate snubbers and slack-cable restraints. I. Vibration isolation curbs shall be made weathertight by sealing with flexible aluminum flashing or closed-cell neoprene or flexible vinyl all around the periphery. This weatherproofing shall in no way inhibit the vibration isolation of the spring elements. A closed-cell sponge gasket shall be provided between the equipment unit and the curb to form a weathertight seal. 3.4 INSTALLATION OF CEILING- AND ROOF-SUSPENDED EQUIPMENT A. Provide vibration isolation for suspended equipment as scheduled and per all instructions within this specification. B. Ceiling- or roof-suspended equipment shall be supported from the heaviest possible structure, such as trusses, girders, beams, or joists. If necessary, provide heavy extra sub-structure GMP-R1 Addendum # Randall Stout Architects, Inc.

6 between the building's existing heavy structure in order to support vibration-isolated equipment. Do not suspend equipment from roof decks or floors without approval of the Owner s Representative. Connect vibration isolation hangers directly to, or as close as possible to, heavy structure. C. Hanger rods shall be aligned and free of contact with hanger boxes. D. Fans and their respective motors shall always be suspended on a common, stiff frame. 3.5 INSTALLATION OF THRUST RESTRAINTS A. Provide horizontal thrust restraints as scheduled for fans delivering large air quantities and with a tendency to rock back on their spring mounts. Install thrust restraints parallel to the axis of air delivery and in pairs on opposite sides of the fan. 3.6 INSTALLATION OF RESILIENT DUCT SUPPORTS A. Provide resilient support of ducts in locations and on isolators as scheduled and/or as shown on the drawings 3.7 INSTALLATION OF RESILIENT PIPE CONNECTIONS TO EQUIPMENT A. Piping connected to vibration-isolated equipment shall be installed so that it does not strain or force out of alignment vibration isolators supporting either the equipment or the piping. To facilitate such connection, any flexible connector approved by the Owner s Representative is acceptable. B. Where specifically scheduled and located, provide Type FPC flexible pipe connectors. 3.8 INSTALLATION OF RESILIENT DUCT CONNECTIONS TO EQUIPMENT A. Provide flexible connections between ducts and all vibrating equipment (including supply and return duct connections at air-handling units and fan coil units). Flexible connectors shall be minimum 4-inches long and allow 1-inch slack at connections. Use woven fiber-glass fabric material as indicated above unless loaded vinyl is specifically scheduled. B. Align sheet metal duct with fan or fan casing opening in all three dimensions prior to installation of flexible connection so that duct and opening nearly coincide and are almost equally spaced 3 inches from one another all around. Do not install flexible connection until above requirements are met. Fans or fan casings and ducts shall be able to move 1 inch in any direction relative to each other without short-circuiting metal to metal or stretching taut the flexible connection. 3.9 INSTALLATION OF FLEXIBLE ELECTRICAL CONNECTIONS TO EQUIPMENT A. Make flexible electrical connections to all vibrating equipment. B. Alternate A: Install flexible conduit in a grossly slack, shallow "U" form. Flexible conduit to be at least 3 feet or 20 diameters long, whichever is the longer. C. Alternate B: The flexible coupling shall be free of any nearby building construction and shall be installed slack and free of strain in any direction. END OF SECTION GMP-R1 Addendum # Randall Stout Architects, Inc.