36C26119B0019-011.docx

Section 23 05 41 Noise and Vibration Control for HVAC Piping and Equipment 12-12-2018 Part 1 - General

1.1. Description

A. This section specifies the application of noise and vibration control techniques to boiler plant rotating equipment including pumps, fans, compressors, motors and steam turbines.

1.2. Related Work

1.3. Submittals

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

B. Noise and Vibration Control Devices; include with the equipment submittals.

1.4. 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 basic designation only.

B. American Boiler Manufacturers Association (ABMA):

ABMA-BOILER 304-1995 Measurement of Sound from Steam Generators Part 2 – Products (Not Used) Part 3 – Execution

3.1. Balancing and Alignment of Rotating Equipment

A. Statically and dynamically balance all pumps, fans, compressors and drivers. Align shafts of pumps, fans, and drivers to limit noise and vibration to specified values. Level and anchor equipment as necessary to achieve and maintain alignment. Refer to Section 23 05 10, COMMON WORK RESULTS FOR BOILER PLANT and STEAM GENERATION, and Section 23 21 11, BOILER PLANT PIPING SYSTEMS.

3.2. Vibration Tests on Rotating Equipment

A. Perform vibration tests on all pumps, fans, compressors and drivers during the pretest of the equipment. Refer to Section 23 08 11, DEMONSTRATIONS AND TESTS FOR BOILER PLANT. Tests shall be conducted by an experienced technician in the presence of the Resident Engineer (RE).

B. Perform tests at each bearing in axial, horizontal, and vertical positions.

C. RMS vibration velocity shall not exceed 0.0025 m/s (0.10inch per second). Correct the cause of excessive vibration and provide retest.

D. Test instruments furnished by contractor:

1. Portable, with output capability to print data.

2. Frequency range, 600150,000 CPM minimum.

3. Amplitude range, 2.54 m/s (0l00 inches per second).

4. Sensitivity, 0.00013 m/s (0.005inch per second).

5. Frequency filter "out" for tests.

E. Submit tabulated vibration readings to the RE.

3.3. Sound Levels

A. Sound level limitations apply to all burners, fans, blowers, pumps, compressors, control valves, pressure reducing valves, motors, turbines.

B. Sound levels shall not exceed 85 DBA when measured 1400 mm (4.5feet) above the floor and 910 mm (3feet) horizontally from each surface of the smallest imaginary rectangular box which could completely enclose the entire unit which contains the sound source. Sound level limitations apply to the operation of the equipment at all loads within the equipment requirements.

C. Tests will be performed by the Government using a standard sound level meter on the "A" scale, slow response. At the option and expense of the Government, a testing company may be employed to conduct tests using methods conforming to the referenced ABMA publication.

D. If sound levels exceed requirements, modify or replace the equipment as necessary to achieve required sound levels and other specified requirements.

1. Submit all proposed modifications or replacements for review prior to starting the work.

2. After completing the work, provide complete retest of equipment operation and performance.

3.4. Commissioning

A. Provide commissioning documentation in accordance with the requirements of section 23 08 00 – COMMISSIONING OF HVAC SYSTEMS for all inspection, start up, and contractor testing required above and required by the System Readiness Checklist provided by the Commissioning Agent.

B. Components provided under this section of the specification will be tested as part of a larger system. Refer to section 23 08 00 – COMMISSIONING OF HVAC SYSTEMS and related sections for contractor responsibilities for system commissioning.

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