230548 SF - VIBRATION AND SEISMIC CONTROLS FOR HVAC PIPING AND EQUIPMENT.DOC

UNIT TRAININGEQUIPMENT SITE ADD/ALT

Copyright 2004 and 2005 by The American Institute of Architects (AIA)

Exclusively published and distributed by Architectural Computer Services, Inc. (ARCOM) for the AIA

SECTION 230548 - VIBRATION AND SEISMIC CONTROLS FOR HVAC PIPING AND EQUIPMENT

This Section uses the term "Architect." Change this term to match that used to identify the design professional as defined in the General and Supplementary Conditions.

Verify that Section titles referenced in this Section are correct for this Project's Specifications; Section titles may have changed.

PART 1 - GENERAL

1.1 SUMMARY

A. This Section includes the following:

Adjust list below to suit Project.

1. Isolation pads.

2. Isolation mounts.

3. Restrained elastomeric isolation mounts.

4. Restrained spring isolators.

5. Housed spring mounts.

6. Elastomeric hangers.

1.2 PERFORMANCE REQUIREMENTS

Retain first paragraph and subparagraphs below for outdoor equipment.

A. Wind-Restraint Loading:

Obtain values for items in subparagraphs below from Project structural engineer or from SEI/ASCE 7.

1. Basic Wind Speed: 90 MPH.

2. Building Classification Category: I.

3. Minimum 10 lb/sq. ft. multiplied by the maximum area of the HVAC component projected on a vertical plane that is normal to the wind direction, and 45 degrees either side of normal.

B. Seismic-Restraint Loading:

Obtain values for items in subparagraphs and associated subparagraphs below from Project structural engineer or from SEI/ASCE 7. If the code at Project site is other than the IBC or NFPA 5000, revise parameters to comply with applicable code.

Specify design spectral response acceleration at short periods (0.2 second) and at 1 second based on site class in subparagraph below. Typical values range from 2 to 200 percent. Design spectral response acceleration is required for seismic force calculations to size seismic restraints. For each seismic restraint, include component importance factor, component response modification factor, and component amplification factor in the HVAC Vibration-Control and Seismic-Restraint Device Schedule.

1. Site Class as Defined in the IBC: B.

In subparagraph below, retain Seismic Use Group or Building Category for Project structure from three classifications defined in the IBC.

2. Assigned Seismic Use Group or Building Category as Defined in the IBC: I.

Retain first three subparagraphs below if these values are not included in the HVAC Vibration-Control and Seismic-Restraint Device Schedule on Drawings. Factors below often vary among supported equipment. However, it is possible to specify maximum values for these factors for various classes of equipment or for all equipment instead of scheduling each piece of equipment.

a. Component Importance Factor: 1.0.

b. Component Response Modification Factor: 1.5.

c. Component Amplification Factor: 1.0.

3. Design Spectral Response Acceleration at Short Periods (0.2 Second): 0.20.

4. Design Spectral Response Acceleration at 1-Second Period: 0.05.

1.3 SUBMITTALS

A. Product Data: For each product indicated.

Retain paragraph below if procedures for welder certification are retained in "Quality Assurance" Article.

B. Welding certificates.

Coordinate first paragraph below with qualification requirements in Division 01 Section "Quality Requirements."

1.4 QUALITY ASSURANCE

A. Comply with seismic-restraint requirements in the IBC unless requirements in this Section are more stringent.

Delete first paragraph below if no welding. Retain "Welding certificates" Paragraph in "Submittals" Article if retaining below. AWS states that welding qualifications remain in effect indefinitely unless welding personnel have not welded for more than six months or there is a specific reason to question their ability.

B. Welding: Qualify procedures and personnel according to AWS D1.1/D1.1M, "Structural Welding Code - Steel."

C. Seismic-restraint devices shall have horizontal and vertical load testing and analysis and shall bear anchorage preapproval OPA number from OSHPD, preapproval by ICC-ES, or preapproval by another agency acceptable to authorities having jurisdiction, showing maximum seismic-restraint ratings. Ratings based on independent testing are preferred to ratings based on calculations. If preapproved ratings are not available, submittals based on independent testing are preferred. Calculations (including combining shear and tensile loads) to support seismic-restraint designs must be signed and sealed by a qualified professional engineer.

PART 2 - PRODUCTS

2.1 VIBRATION ISOLATORS

See Editing Instruction No. 1 in the Evaluations for cautions about naming manufacturers and products. Retain one of three paragraphs and list of manufacturers below. See Division 01 Section "Product Requirements."

A. Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated into the Work include, but are not limited to, the following:

1. Ace Mountings Co., Inc.

2. Amber/Booth Company, Inc.

3. California Dynamics Corporation.

Copy paragraph and subparagraph below for each type of pad configuration required for Project. Use drawing designation and coordinate with the HVAC Vibration-Control and Seismic-Restraint Device Schedule on Drawings.

B. Pads: Arranged in single or multiple layers of sufficient stiffness for uniform loading over pad area, molded with a nonslip pattern and galvanized-steel baseplates, and factory cut to sizes that match requirements of supported equipment.

Verify availability of various pad materials with manufacturers.

1. Resilient Material: Oil- and water-resistant neoprene.

Copy paragraph and subparagraphs below for each type of mount configuration required for Project. Use drawing designation and coordinate with the HVAC Vibration-Control and Seismic-Restraint Device Schedule on Drawings.

C. Mounts: Double-deflection type, with molded, oil-resistant rubber, hermetically sealed compressed fiberglass, or neoprene isolator elements with factory-drilled, encapsulated top plate for bolting to equipment and with baseplate for bolting to structure. Color-code or otherwise identify to indicate capacity range.

1. Materials: Cast-ductile-iron or welded steel housing containing two separate and opposing, oil-resistant rubber or neoprene elements that prevent central threaded element and attachment hardware from contacting the housing during normal operation.

2. Neoprene: Shock-absorbing materials compounded according to the standard for bridge-bearing neoprene as defined by AASHTO.

Copy paragraph and subparagraphs below for each type of restrained mount configuration required for Project. Use drawing designation and coordinate with the HVAC Vibration-Control and Seismic-Restraint Device Schedule on Drawings.

D. Restrained Mounts: All-directional mountings with seismic restraint.

1. Materials: Cast-ductile-iron or welded steel housing containing two separate and opposing, oil-resistant rubber or neoprene elements that prevent central threaded element and attachment hardware from contacting the housing during normal operation.

2. Neoprene: Shock-absorbing materials compounded according to the standard for bridge-bearing neoprene as defined by AASHTO.

Copy paragraph and subparagraphs below for each type of spring isolator configuration required for Project. Use drawing designation and coordinate with the HVAC Vibration-Control and Seismic-Restraint Device Schedule on Drawings.

Copy paragraph and subparagraphs below for each type of restrained spring isolator configuration required for Project. Use drawing designation and coordinate with the HVAC Vibration-Control and Seismic-Restraint Device Schedule on Drawings.

E. Restrained Spring Isolators: Freestanding, steel, open-spring isolators with seismic or limit-stop restraint.

1. Housing: Steel with resilient vertical-limit stops to prevent spring extension due to weight being removed; factory-drilled baseplate bonded to 1/4-inch-thick, neoprene or rubber isolator pad attached to baseplate underside; and adjustable equipment mounting and leveling bolt that acts as blocking during installation.

2. Restraint: Seismic or limit stop as required for equipment and authorities having jurisdiction.

3. Outside Spring Diameter: Not less than 80 percent of the compressed height of the spring at rated load.

4. Minimum Additional Travel: 50 percent of the required deflection at rated load.

5. Lateral Stiffness: More than 80 percent of rated vertical stiffness.

6. Overload Capacity: Support 200 percent of rated load, fully compressed, without deformation or failure.

Copy paragraph and subparagraphs below for each type of housed spring mount configuration required for Project. Use drawing designation and coordinate with the HVAC Vibration-Control and Seismic-Restraint Device Schedule on Drawings.

Copy paragraph below for each type of elastomeric hanger configuration required for Project. Use drawing designation and coordinate with the HVAC Vibration-Control and Seismic-Restraint Device Schedule on Drawings.

F. Elastomeric Hangers: Single or double-deflection type, fitted with molded, oil-resistant elastomeric isolator elements bonded to steel housings with threaded connections for hanger rods. Color-code or otherwise identify to indicate capacity range.

Copy paragraph and subparagraphs below for each type of spring hanger configuration required for Project. Use drawing designation and coordinate with the HVAC Vibration-Control and Seismic-Restraint Device Schedule on Drawings.

Copy paragraph and subparagraphs below for each type of spring hanger with vertical-limit stop configuration required for Project. Use drawing designation and coordinate with the HVAC Vibration-Control and Seismic-Restraint Device Schedule on Drawings.

Copy first paragraph below for each type of pipe riser resilient support configuration required for Project. Use drawing designation and coordinate with the HVAC Vibration-Control and Seismic-Restraint Device Schedule on Drawings.

2.2 SEISMIC-RESTRAINT DEVICES

Coordinate specifications for seismic-restraint components in this Article with structural engineer and with Drawings.

See Editing Instruction No. 1 in the Evaluations for cautions about naming manufacturers and products. Retain one of three paragraphs and list of manufacturers below. See Division 01 Section "Product Requirements."

A. Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated into the Work include, but are not limited to, the following:

1. Amber/Booth Company, Inc.

2. California Dynamics Corporation.

3. Cooper B-Line, Inc.; a division of Cooper Industries.

See Evaluations for a discussion on seismic-restraint capacities and rating services.

B. General Requirements for Restraint Components: Rated strengths, features, and applications shall be as defined in reports by an agency acceptable to authorities having jurisdiction.

1. Structural Safety Factor: Allowable strength in tension, shear, and pullout force of components shall be at least four times the maximum seismic forces to which they will be subjected.

Retain first paragraph below for strengthening resistance of hanger rods against seismic forces that may cause buckling of rods; delete if detailed on Drawings. Use with either channel- or cable-type bracing assemblies when required to counter seismic forces. Detail fabrication and indicate locations on Drawings.

C. Hanger Rod Stiffener: Reinforcing steel angle clamped to hanger rod.

D. Bushings for Floor-Mounted Equipment Anchor Bolts: Neoprene bushings designed for rigid equipment mountings, and matched to type and size of anchor bolts and studs.

E. Resilient Isolation Washers and Bushings: One-piece, molded, oil- and water-resistant neoprene, with a flat washer face.

Expansion-type anchor bolts are not permitted by SEI/ASCE 7 for nonisolated equipment in excess of 10 hp (7.46 kW).

F. Mechanical Anchor Bolts: Drilled-in and stud-wedge or female-wedge type in zinc-coated steel for interior applications and stainless steel for exterior applications. Select anchor bolts with strength required for anchor and as tested according to ASTM E 488. Minimum length of eight times diameter.

PART 3 - EXECUTION

3.1 APPLICATIONS

A. Multiple Pipe Supports: Secure pipes to trapeze member with clamps approved for application by OSHPD.

Indicate on Drawings, by details, schedules, or a combination of both, the locations where hanger rods for individual pipes and hanger rods for trapeze hangers require hanger rod stiffeners.

B. Hanger Rod Stiffeners: Install hanger rod stiffeners where indicated or scheduled on Drawings to receive them and where required to prevent buckling of hanger rods due to seismic forces.

C. Strength of Support and Seismic-Restraint Assemblies: Where not indicated, select sizes of components so strength will be adequate to carry present and future static and seismic loads within specified loading limits.

3.2 VIBRATION-CONTROL AND SEISMIC-RESTRAINT DEVICE INSTALLATION

A. Equipment Restraints:

1. Install resilient bolt isolation washers on equipment anchor bolts where clearance between anchor and adjacent surface exceeds 0.125 inch.

2. Install seismic-restraint devices using methods approved by OSHDP providing required submittals for component.

B. Install seismic-restraint devices using methods approved by OSHDP providing required submittals for component.

C. Attachment to Structure: If specific attachment is not indicated, anchor bracing to structure at flanges of beams, at upper truss chords of bar joists, or at concrete members.

D. Drilled-in Anchors:

1. Identify position of reinforcing steel and other embedded items prior to drilling holes for anchors. Do not damage existing reinforcing or embedded items during coring or drilling. Notify the structural engineer if reinforcing steel or other embedded items are encountered during drilling. Locate and avoid prestressed tendons, electrical and telecommunications conduit, and gas lines.

2. Do not drill holes in concrete or masonry until concrete, mortar, or grout has achieved full design strength.

3. Wedge Anchors: Protect threads from damage during anchor installation. Heavy-duty sleeve anchors shall be installed with sleeve fully engaged in the structural element to which anchor is to be fastened.

4. Set anchors to manufacturer's recommended torque, using a torque wrench.

5. Install zinc-coated steel anchors for interior and stainless-steel anchors for exterior applications.

3.3 ACCOMMODATION OF DIFFERENTIAL SEISMIC MOTION

Coordinate this Article with Drawings.

A. Install flexible connections in piping where they cross seismic joints, where adjacent sections or branches are supported by different structural elements, and where the connections terminate with connection to equipment that is anchored to a different structural element from the one supporting the connections as they approach equipment.

3.4 FIELD QUALITY CONTROL

A. Perform tests and inspections.

Retain first paragraph and subparagraphs below to describe tests and inspections to be performed.

B. Tests and Inspections:

1. Provide evidence of recent calibration of test equipment by a testing agency acceptable to authorities having jurisdiction.

2. Schedule test with Owner, through Architect, before connecting anchorage device to restrained component (unless postconnection testing has been approved), and with at least seven days' advance notice.

3. Obtain Architect's approval before transmitting test loads to structure. Provide temporary load-spreading members.

4. Test at least four of each type and size of installed anchors and fasteners selected.

5. Test to 90 percent of rated proof load of device.

6. Measure isolator restraint clearance.

7. Measure isolator deflection.

8. If a device fails test, modify all installations of same type and retest until satisfactory results are achieved.

C. Remove and replace malfunctioning units and retest as specified above.

D. Prepare test and inspection reports.

3.5 ADJUSTING

A. Adjust isolators after piping system is at operating weight.

B. Adjust limit stops on restrained spring isolators to mount equipment at normal operating height. After equipment installation is complete, adjust limit stops so they are out of contact during normal operation.

C. Adjust active height of spring isolators.

D. Adjust restraints to permit free movement of equipment within normal mode of operation.

END OF SECTION 230548

Project No: 390265

VIBRATION AND SEISMIC CONTROLS FOR HVAC

230548 - 1

PIPING AND EQUIPMENT