230541.pdf

VA CINCINNATI PROJECT NO. 539-21-208

RELOCATE I.T. OFFICES

02-01-20 (Amendment 11/2/21 Revision)

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SECTION 23 05 41

NOISE AND VIBRATION CONTROL FOR HVAC PIPING AND EQUIPMENT

PART 1 - GENERAL

1.1 DESCRIPTION

A. This section specifies the application of noise control measures and seismic restraint for HVAC equipment and parts.

B. A complete listing of all common acronyms and abbreviations are included in Section 23 05 11, COMMON WORK RESULTS FOR HVAC.

1.2 RELATED WORK

A. Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA AND SAMPLES.

B. Section 23 05 11, COMMON WORK RESULTS FOR HVAC.

C. Section 23 31 00, HVAC DUCTS AND CASINGS.

1.3 QUALITY ASSURANCE

A. Refer to article, QUALITY ASSURANCE in specification Section 23 05 11, COMMON WORK

RESULTS FOR HVAC.

B. Noise Criteria:

1. Noise levels in all 8 octave bands due to equipment and duct systems shall not exceed following NC levels:

TYPE OF ROOM NC LEVEL

Offices, Large Open 40

Offices, Small Private 35

2. For equipment which has no sound power ratings scheduled on the plans, the contractor shall select equipment such that the fore-going noise criteria, local ordinance noise levels, and OSHA requirements are not exceeded. Selection procedure shall be in accordance with

ASHRAE Fundamentals Handbook, Chapter 8, Sound and Vibration.

3. An allowance, not to exceed 5db, may be added to the measured value to compensate for the variation of the room attenuating effect between room test condition prior to occupancy and design condition after occupancy which may include the addition of sound absorbing material, such as furniture. This allowance may not be taken after occupancy. The room attenuating effect is defined as the difference between sound power level emitted to room and sound pressure level in room.

4. In absence of specified measurement requirements, measure equipment noise levels three feet from equipment and at an elevation of maximum noise generation.

C. Seismic Restraint Requirements:

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1. Equipment:

a. All mechanical equipment not supported with isolators external to the unit shall be securely anchored to the structure. Such mechanical equipment shall be properly supported to resist a horizontal force of 50 percent of the weight of the equipment furnished.

2. Piping: Refer to specification Section 23 05 11, COMMON WORK RESULTS FOR HVAC.

3. Ductwork: Refer to specification Section 23 31 00, HVAC DUCTS AND CASINGS.

1.4 SUBMITTALS

A. Submit in accordance with specification Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES.

B. Manufacturer's Literature and Data:

1. Seismic restraint provisions and bolting.

C. Seismic Requirements: Submittals are required for all equipment anchors, supports and seismic restraints. Submittals shall include weights, dimensions, standard connections, and manufacturer's certification that all specified equipment will withstand seismic Lateral Force requirements as shown on drawings.

1.5 APPLICABLE PUBLICATIONS

A. The publications listed below form a part of this specification to the extent referenced. The publications are referenced in the text by the basic designation only.

B. American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. (ASHRAE):

Handbook 2017 ......................... Fundamentals Handbook, Chapter 8, Sound and Vibration

Handbook 2015 ......................... HVAC Applications Handbook, Chapter 49, Noise and Vibration

Control

C. American Society for Testing and Materials (ASTM):

A123/A123M-2017 ..................... Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products

A307-2016 .................................. Standard Specification for Carbon Steel Bolts and Studs, 60,000

PSI Tensile Strength

D2240-05(2010) ......................... Standard Test Method for Rubber Property - Durometer

Hardness

D. Manufacturers Standardization (MSS):

SP-58-2018 ................................ Pipe Hangers and Supports-Materials, Design and Manufacture

E. Occupational Safety and Health Administration (OSHA):

29 CFR 1960.95 ......................... Occupational Noise Exposure

F. American Society of Civil Engineers (ASCE):

ASCE 7-2017 ............................. Minimum Design Loads for Buildings and Other Structures.

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G. American National Standards Institute / Sheet Metal and Air Conditioning Contractor’s National

Association (ANSI/SMACNA):

001-2008 .................................... Seismic Restraint Manual: Guidelines for Mechanical Systems, 3rd Edition.

H. International Code Council (ICC):

IBC 2018 .................................... International Building Code.

I. Department of Veterans Affairs (VA):

H-18-8 2016 ............................... Seismic Design Requirements.

PART 2 - PRODUCTS

2.1 SOUND ATTENUATING UNITS

Refer to specification Section 23 31 00, HVAC DUCTS AND CASINGS.

2.2 SEISMIC RESTRAINT REQUIREMENTS FOR EQUIPMENT

A. On all sides of suspended equipment, provide bracing for rigid supports and provide restraints for resiliently supported equipment.

PART 3 - EXECUTION

3.1 ADJUSTING

A. Torque anchor bolts according to equipment manufacturer's recommendations to resist seismic forces.

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