VA 23 05 41-2010 NOISE AND VIBRATION CONTROL FOR HVAC PIPING AND EQUIPMENT.pdf

1、11-10 23 05 41 - 1 SECTION 23 05 41 NOISE AND VIBRATION CONTROL FOR HVAC PIPING AND EQUIPMENT SPEC WRITER NOTE: Delete between /_/ if not applicable to project. Also delete any other item or paragraph not applicable in the section and renumber the paragraphs. PART 1 - GENERAL 1.1 DESCRIPTION Noise c

2、riteria, / seismic restraints for equipment /, vibration tolerance and vibration isolation for HVAC and plumbing work. 1.2 RELATED WORK /A. Section 03 30 00, CAST-IN-PLACE CONCRETE: Requirements for concrete inertia bases. / B. Section 13 05 41, SEISMIC RESTRAINT REQUIREMENTS FOR NON-STRUCTURAL COMP

3、ONENTS: Seismic requirements for non-structural equipment C. Section 23 05 11, COMMON WORK RESULTS FOR HVAC and STEAM GENERATION: General mechanical requirements and items, which are common to more than one section of Division 23. D. Section 23 22 13, STEAM and CONDENSATE HEATING PIPING: Requirement

4、s for flexible pipe connectors to reciprocating and rotating mechanical equipment. E. Section 23 73 00, INDOOR CENTRAL-STATION AIR-HANDLING UNITS: Requirements for optional Air Handling Unit internal vibration isolation. F. Section 23 31 00, HVAC DUCTS and CASINGS: requirements for flexible duct con

5、nectors, sound attenuators and sound absorbing duct lining. G. SECTION 23 05 93, TESTING, ADJUSTING, and BALANCING FOR HVAC: requirements for sound and vibration tests. H. SECTION 23 37 00, AIR OUTLETS and INLETS: noise requirements for G-grilles. I. SECTION 23 21 23, HYDRONIC PUMPS: vibration isola

6、tion requirements for pumps. J. SECTION 23 34 00, HVAC FANS: sound and vibration isolation requirements for fans. K. SECTION 23 65 00, COOLING TOWERS: requirements for sound and vibration isolation for cooling towers. L. SECTION 26 32 13, ENGINER GENERATORS: requirements for sound and vibration isol

7、ation. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-12-06M 23 05 41 - 2 M. Section 23 08 00, COMMISSIONING OF HVAC SYSTEMS: Requirements for commissioning, systems readiness checklists, and training. SPEC WRITER NOTE: The designer shall perform an

8、 acoustic analysis, as stipulated in the VA HVAC Design Manual, to ensure compliance with the specified Room Design NC Levels. The designer is responsible for evaluating and controlling equipment noise and shall select equipment, specify sound ratings, and provide attenuators so that noise criteria

9、listed below, local noise ordinance levels, and OSHA requirements will not be exceeded. It is recognized that for the rooms equipped with self-contained cooling units, room noise levels shall be at least 5 dB higher than the specified values. 1.3 QUALITY ASSURANCE A. Refer to article, QUALITY ASSURA

10、NCE in specification Section 23 05 11, COMMON WORK RESULTS FOR HVAC and STEAM GENERATION. SPEC WRITER NOTE: Edit list of rooms and NC levels to suit specific project being designed. Add rooms and NC levels if required. B. Noise Criteria: 1. Noise levels in all 8 octave bands due to equipment and duc

11、t systems shall not exceed following NC levels: TYPE OF ROOM NC LEVEL Audio Speech Pathology 25 Audio Suites 25 Auditoriums, Theaters 35-40 Bathrooms and Toilet Rooms 40 Chapels 35 Conference Rooms 35 Corridors (Nurse Stations) 40 Corridors(Public) 40 Dining Rooms, Food Services/ Serving 40 Examinat

12、ion Rooms 35 Gymnasiums 50 Kitchens 50 Laboratories (With Fume Hoods) 45 to 55 Laundries 50 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-12-06M 23 05 41 - 3 Lobbies, Waiting Areas 40 Locker Rooms 45 Offices, Large Open 40 Offices, Small Private 35

13、 Operating Rooms 40 Patient Rooms 35 Phono/Cardiology 25 Recreation Rooms 40-45 Shops 50 SPD (Decontamination and Clean Preparation) 45 Therapeutic Pools 45 Treatment Rooms 35 Warehouse 50 X-Ray and General Work Rooms 40 2. For equipment which has no sound power ratings scheduled on the plans, the c

14、ontractor shall select equipment such that the fore-going noise criteria, local ordinance noise levels, and OSHA re-quirements are not exceeded. Selection procedure shall be in accordance with ASHRAE Fundamentals Handbook, Chapter 7, Sound and Vibration. 3. An allowance, not to exceed 5db, may be ad

15、ded 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

16、. 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 maxi-mum noise generation. /C. S

17、eismic Restraint Requirements: SPEC WRITER NOTE: Brace equipment in accordance with Seismic Design Categories B, C, D, E, and F and Importance Factor as defined in ASCE-7. Brace ductwork and piping in accordance with the above Provided by IHSNot for ResaleNo reproduction or networking permitted with

18、out license from IHS-,-,-12-06M 23 05 41 - 4 guidelines as well as the Seismic Hazard Level as found in the SMACNA Seismic Restraint Manual. 1. Equipment: a. All mechanical equipment not supported with isolators external to the unit shall be securely anchored to the structure. Such mechanical equipm

19、ent shall be properly supported to resist a horizontal force of / 50 / 20 / percent of the weight of the equipment furnished. b. All mechanical equipment mounted on vibration isolators shall be provided with seismic restraints capable of resisting a horizontal force of / 100 / 50 / percent of the we

20、ight of the equipment furnished. 2. Piping: Refer to specification Section 23 05 11, COMMON WORK RESULTS FOR HVAC and STEAM GENERATION. 3. Ductwork: Refer to specification Section 23 31 00, HVAC DUCTS AND CASINGS. D. Allowable Vibration Tolerances for Rotating, Non-reciprocating Equip-ment: Not to e

21、xceed a self-excited vibration maximum velocity of 5 mm per second (0.20 inch per second) RMS, filter in, when measured with a vibration meter on bearing caps of machine in vertical, horizontal and axial directions or measured at equipment mounting feet if bearings are concealed. Measurements for in

22、ternally isolated fans and motors may be made at the mounting feet. 1.4 SUBMITTALS A. Submit in accordance with specification Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, and SAMPLES. B. Manufacturers Literature and Data: 1. Vibration isolators: a. Floor mountings b. Hangers c. Snubbers d. Thrust

23、restraints 2. Bases. /3. Seismic restraint provisions and bolting./ 4. Acoustical enclosures. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-12-06M 23 05 41 - 5 C. Isolator manufacturer shall furnish with submittal load calculations for selection of

24、 isolators, including supplemental bases, based on lowest operating speed of equipment supported. /D. Seismic Requirements: Submittals are required for all equipment an-chors, supports and seismic restraints. Submittals shall include weights, dimensions, standard connections, and manufacturers certi

25、fication 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

26、 only. B. American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. (ASHRAE): 2009 Fundamentals Handbook, Chapter 7, Sound and Vibration C. American Society for Testing and Materials (ASTM): A123/A123M-09 Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and

27、 Steel Products A307-07b . 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-58-2009 . Pipe Hangers and Supports-Materials, Design and Manufact

28、ure E. Occupational Safety and Health Administration (OSHA): 29 CFR 1910.95 . Occupational Noise Exposure F. American Society of Civil Engineers (ASCE): ASCE 7-10 . Minimum Design Loads for Buildings and Other Structures. G. American National Standards Institute / Sheet Metal and Air Conditioning Co

29、ntractors National Association (ANSI/SMACNA): 001-2008 . Seismic Restraint Manual: Guidelines for Mechanical Systems, 3rd Edition. H. International Code Council (ICC): 2009 IBC . International Building Code. I. Department of Veterans Affairs (VA): Provided by IHSNot for ResaleNo reproduction or netw

30、orking permitted without license from IHS-,-,-12-06M 23 05 41 - 6 H-18-8 2010 Seismic Design Requirements. PART 2 - PRODUCTS 2.1 GENERAL REQUIREMENTS A. Type of isolator, base, and minimum static deflection shall be as required for each specific equipment application as recommended by isolator or eq

31、uipment manufacturer but subject to minimum requirements indicated herein and in the schedule on the drawings. B. Elastometric Isolators shall comply with ASTM D2240 and be oil resistant neoprene with a maximum stiffness of 60 durometer and have a straight-line deflection curve. C. Exposure to weath

32、er: Isolator housings to be either hot dipped galvanized or powder coated to ASTM B117 salt spray testing standards. Springs to be powder coated or electro galvanized. All hardware to be electro galvanized. In addition provide limit stops to resist wind velocity. Velocity pressure established by win

33、d shall be calculated in accordance with section 1609 of the International Building Code. A minimum wind velocity of 75 mph shall be employed. D. Uniform Loading: Select and locate isolators to produce uniform loading and deflection even when equipment weight is not evenly distributed. E. Color code

34、 isolators by type and size for easy identification of capacity. 2.2 SEISMIC RESTRAINT REQUIREMENTS FOR EQUIPMENTS A. Bolt pad mounted equipment, without vibration isolators, to the floor or other support using ASTM A307 standard bolting material. B. Floor mounted equipment, with vibration Isolators

35、: Type SS. Where Type N isolators are used provide channel frame base horizontal restraints bolted to the floor, or other support, on all sides of the equipment Size and material required for the base shall be as recommended by the isolator manufacturer. C. On all sides of suspended equipment, provi

36、de bracing for rigid supports and provide restraints for resiliently supported equipment. 2.3 VIBRATION ISOLATORS A. Floor Mountings: 1. Double Deflection Neoprene (Type N): Shall include neoprene covered steel support plated (top and bottom), friction pads, and necessary bolt holes. SPEC WRITER NOT

37、E: For projects in Seismic Design Category C, D, E, and F delete Types S, D, W and L. For projects in Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-12-06M 23 05 41 - 7 Seismic Design Category B delete Types DS, SS, and snubbers. 2. Spring Isolators

38、 (Type S): Shall be free-standing, laterally stable and include acoustical friction pads and leveling bolts. Isolators shall have a minimum ratio of spring diameter-to-operating spring height of 1.0 and an additional travel to solid equal to 50 percent of rated deflection. 3. Captive Spring Mount fo

39、r Seismic Restraint (Type SS): a. Design mounts to resiliently resist seismic forces in all direc-tions. Snubbing shall take place in all modes with adjustment to limit upward, downward, and horizontal travel to a maximum of 6 mm (1/4-inch) before contacting snubbers. Mountings shall have a minimum

40、rating of one G coefficient of gravity as calculated and certified by a registered structural engineer. b. All mountings shall have leveling bolts that must be rigidly bolted to the equipment. Spring diameters shall be no less than 0.8 of the compressed height of the spring at rated load. Springs sh

41、all have a minimum additional travel to solid equal to 50 percent of the rated deflection. Mountings shall have ports for spring inspection. Provide an all directional neoprene cushion collar around the equipment bolt. 4. Spring Isolators with Vertical Limit Stops (Type SP): Similar to spring isolat

42、ors noted above, except include a vertical limit stop to limit upward travel if weight is removed and also to reduce movement and spring extension due to wind loads. Provide clearance around restraining bolts to prevent mechanical short circuiting. / Isolators shall have a minimum seismic rating of

43、one G. / 5. Pads (Type D), Washers (Type W), and Bushings (Type L): Pads shall be natural rubber or neoprene waffle, neoprene and steel waffle, or reinforced duck and neoprene. Washers and bushings shall be reinforced duck and neoprene. Washers and bushings shall be reinforced duck and neoprene. Siz

44、e pads for a maximum load of 345 kPa (50 pounds per square inch). 6. Seismic Pad (Type DS): Pads shall be natural rubber / neoprene waffle with steel top plate and drilled for an anchor bolt. Washers and bushings shall be reinforced duck and neoprene. Size pads for a maximum load of 345 kPa (50 poun

45、ds per square inch). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-12-06M 23 05 41 - 8 B. Hangers: Shall be combination neoprene and springs unless otherwise noted and shall allow for expansion of pipe. 1. Combination Neoprene and Spring (Type H):

46、Vibration hanger shall contain a spring and double deflection neoprene element in series. Spring shall have a diameter not less than 0.8 of compressed oper-ating spring height. Spring shall have a minimum additional travel of 50 percent between design height and solid height. Spring shall permit a 1

47、5 degree angular misalignment without rubbing on hanger box. 2. Spring Position Hanger (Type HP): Similar to combination neoprene and spring hanger except hanger shall hold piping at a fixed elevation during installation and include a secondary adjustment feature to transfer load to spring while mai

48、ntaining same position. 3. Neoprene (Type HN): Vibration hanger shall contain a double deflection type neoprene isolation element. Hanger rod shall be separated from contact with hanger bracket by a neoprene grommet. 4. Spring (Type HS): Vibration hanger shall contain a coiled steel spring in series

49、 with a neoprene grommet. Spring shall have a diameter not less than 0.8 of compressed operating spring height. Spring shall have a minimum additional travel of 50 percent between design height and solid height. Spring shall permit a 15 degree angular misalignment without rubbing on hanger box. 5. Hanger supports for piping 50 mm (2 inches) and larger shall have a po