230548 vibration and seismic controls for hvac piping and equipment.pdf

F5W61607 Combined Support Maintenance Shop - Phase II Ohio Army National Guard Rev. 0 Defense Supply Center Columbus, Ohio 30 January 2009 Bid Final

VIBRATION AND SEISMIC CONTROLS FOR HVAC PIPING AND

EQUIPMENT

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SECTION 230548 - VIBRATION AND SEISMIC CONTROLS FOR HVAC PIPING AND

EQUIPMENT

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. This Section includes the following:

1. Neoprene isolation mounts.

2. Neoprene isolation pads.

3. Neoprene hangers.

4. Spring isolators.

5. Seismic snubbers.

6. Seismic restraint cables.

7. Pipe connectors.

8. Anchors

1.3 PERFORMANCE REQUIREMENTS

A. Wind-Restraint Loading:

1. Conform to requirements of ASCE 7-05 Chapter 6 and IBC 06.

2. Wind Loads are as follows:

a. Basic Wind Speed: 90 mph.

b. Building Classification Category: III.

c. 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:

1. Conform to requirements of ASCE 7-05 Chapter 13 and IBC 06.

2. Site Class as Defined in the IBC: D.

3. Assigned Seismic Use Group or Building Category as defined in the IBC: III.

a. Component Importance Factor: 1.5.

b. Component Response Modification Factor: 3.0.

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c. Component Amplification Factor: 3.0.

4. Design Spectral Response Acceleration at Short Periods (0.2 Second): 0.163 percent.

5. Design Spectral Response Acceleration at 1-Second Period: 0.0680 percent.

1.4 SUBMITTALS

A. Product Data: For the following:

1. Include rated load, rated deflection, and overload capacity for each vibration isolation device.

2. Illustrate and indicate style, material, strength, fastening provision, and finish for each type and size of seismic-restraint component used.

a. Tabulate types and sizes of seismic restraints, complete with report numbers and rated strength in tension and shear as evaluated by OSHPD or an agency acceptable to authorities having jurisdiction.

b. Annotate to indicate application of each product submitted and compliance with requirements.

3. Interlocking Snubbers: Include ratings for horizontal, vertical, and combined loads.

B. Delegated-Design Submittal: For vibration isolation and seismic-restraint details indicated to comply with performance requirements and design criteria, including analysis data signed and sealed by the qualified professional engineer responsible for their preparation.

1. Design Calculations: Calculate static and dynamic loading due to equipment weight and operation and seismic and wind forces required to select vibration isolators, seismic and wind restraints.

2. Riser Supports: Include riser diagrams and calculations showing anticipated expansion and contraction at each support point, initial and final loads on building structure, spring deflection changes, and seismic loads. Include certification that riser system has been examined for excessive stress and that none will exist.

3. Seismic and Wind Restraint Details:

a. Design Analysis: To support selection and arrangement of seismic and wind restraints. Include calculations of combined tensile and shear loads.

b. Details: Indicate fabrication and arrangement. Detail attachments of restraints to the restrained items and to the structure. Show attachment locations, methods, and spacing. Identify components, list their strengths, and indicate directions and values of forces transmitted to the structure during seismic events. Indicate association with vibration isolation devices.

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c. Coordinate seismic-restraint and vibration isolation details with wind-restraint details required for equipment mounted outdoors. Comply with requirements in other Division 23 Sections for equipment mounted outdoors.

d. Pre-approval and Evaluation Documentation: By OSHPD or an agency acceptable to authorities having jurisdiction, showing maximum ratings of restraint items and the basis for approval (tests or calculations).

C. Coordination Drawings: Show coordination of seismic bracing for HVAC piping and equipment with other systems and equipment in the vicinity, including other supports and seismic restraints.

D. Welding certificates.

E. Qualification Data: For professional engineer and/or testing agency.

F. Field quality-control test reports.

1.5 QUALITY ASSURANCE

A. Testing Agency Qualifications: An independent agency, with the experience and capability to conduct the testing indicated, that is a nationally recognized testing laboratory (NRTL) as defined by OSHA in 29 CFR 1910.7, and that is acceptable to authorities having jurisdiction.

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

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

D. Seismic-restraint devices shall have horizontal and vertical load testing and analysis and shall bear anchorage pre-approval OPA number from OSHPD or pre-approval 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 pre-approved 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.

1.6 COORDINATION

A. Housekeeping Pads: Reference Structural Drawings for Exterior and Interior Pad Details.

B. Supplementary Support Steel: Contractor shall supply supplementary support steel for all equipment, piping, ductwork, as required or specified.

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C. Attachments: Contractor shall supply restraint attachment plates cast into housekeeping pads, concrete inserts, double sided beam clamps, etc. in accordance with the requirements of the vibration vendors calculations.

PART 2 - PRODUCTS

2.1 VIBRATION ISOLATORS AND SEISMIC RESTRAINTS

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. Kinetics Noise Control.

4. Mason Industries.

5. Metraflex

6. Vibration Eliminator Co., Inc.

B. Type 1 - Neoprene Pads:

1. 3/4-inch thick neoprene pad consisting of 2 inch square waffle modules. Load distribution plates shall be used as required.

C. Type 6 - Restrained Spring Mountings:

1. Restrained spring mountings shall have a Type 5 free standing mounting within a rigid housing that includes vertical limit stops to prevent spring extension when weight is removed.

2. The housing shall serve as blocking during erection. Installed and operating heights shall be equal.

3. 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.

4. Restraining bolts shall have a neoprene bushing between the bolt and the housing.

5. Limit stops shall be out of contact during normal operation.

6. Since housings will be bolted or welded in position there must be an internal isolation pad.

7. Housing shall be designed to resist all seismic forces.

D. Type 7 - Housed Spring Mountings:

1. Housed spring mountings shall have a Type 5 free standing mounting built into a ductile iron or steel housing to provide all directional seismic snubbing.

2. The snubber shall be adjustable vertically and allow a maximum of 1/4-inch travel in all directions before contacting the resilient snubbing collars.

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E. Type 10 - Spring Hangers:

1. Hangers shall consist of rigid steel frames containing minimum 1-1/4 inch thick neoprene elements at the top and a steel spring with general characteristics as in a Type 5 seated in a steel washer reinforced neoprene cup on the bottom.

2. The neoprene element and the cup shall have neoprene bushings projecting through the steel box.

3. To maintain stability the boxes shall not be articulated as clevis hangers nor the neoprene element stacked on top of the spring.

4. Spring diameters and hanger box lower hole sizes shall be large enough to permit the hanger rod to swing through a 30 deg arc from side to side before contacting the rod bushing and short circuiting the spring.

F. Type 10A – Seismic Spring Hangers:

1. Hangers shall be Type 10, but they shall be supplied with a combination rubber and steel rebound washer as the seismic up stop for suspended piping, ductwork and equipment.

2. Rubber thickness shall be a minimum of 1/4-inch.

G. Type 11 – Pre-compressed Seismic Spring Hangers:

1. Hangers shall be Type 10, but they shall be pre-compressed and locked at the rated deflection by means of a resilient seismic up-stop to keep the piping or equipment at a fixed elevation during installation.

2. The hangers shall be designed with a release mechanism to free the spring after the installation is complete and the hanger is subjected to its full load.

3. Deflection shall be clearly indicated by means of a scale.

H. Type 12 - Seismic Cable Restraints:

1. Seismic Cable Restraints shall consist of galvanized steel aircraft cables sized to resist seismic loads with a minimum safety factor of two and arranged to provide all-directional restraint.

2. Cables must be pre-stretched to achieve a certified minimum modulus of elasticity.

3. Cable end connections shall be steel assemblies that swivel to final installation angle and utilize two clamping bolts to provide proper cable engagement.

4. Cables must not be allowed to bend across sharp edges.

I. Type 13 - Seismic Solid Braces:

1. Shall consist of steel angles or channels to resist seismic loads with a minimum safety factor of 2 and arranged to provide all directional restraint.

2. Seismic solid brace end connectors shall be steel assemblies that swivel to the final installation angle and utilize two through bolts to provide proper attachment.

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J. Type 14 - Seismic Rod Clamps:

1. Steel angles, sized to prevent buckling, shall be clamped to pipe or equipment rods utilizing a minimum of three ductile iron clamps at each restraint location when required.

2. Welding of support rods is not acceptable.

K. Type 15 – Pipe Clevis Bolt Braces:

1. Pipe clevis cross bolt braces are required in all restraint locations.

2. They shall be special purpose preformed channels deep enough to be held in place by bolts passing over the cross bolt.

L. Type 17 - Seismic Snubbers:

1. All directional seismic snubbers shall consist of interlocking steel members restrained by shock absorbent rubber materials compounded to bridge bearing specifications.

2. Elastomeric materials shall be replaceable and a minimum of 3/4-inch thick.

3. Rated loadings shall not exceed 1000 psig.

4. Snubbers shall be manufactured with an air gap between hard and resilient material of not less than 1/8-inch or more that 1/4-inch.

5. Snubbers shall be installed with factory set clearances.

6. The capacity of the seismic snubber at 3/8-inch deflection shall be equal or greater than the load assigned to the mounting grouping controlled by the snubber multiplied by the applicable G-force.

M. Type 18 – Stud Wedge Anchors:

1. Stud wedge anchors shall be manufactured from full diameter wire, not from undersized wire that is rolled up to create the thread.

2. The stud anchor shall also have a safety shoulder which fully supports the wedge ring under load.

N. Type 19 – Female Wedge Anchors:

1. Female wedge anchors are preferred in floor locations so isolators or equipment can be slid into place after the anchors are installed.

2. Anchors shall be manufactured from full diameter wire, and shall have a safety shoulder to fully support the wedge ring under load.

O. Type 24 - Flexible Pipe Connectors:

1. Flexible connectors shall be of the braided stainless steel type.

2. Flexible hose section to be 321stainless steel, close pitch, annular corrugated hose with a braided outer covering of type 304 stainless steel.

3. End connections to be ANSI class 150 carbon steel plate flanges.

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4. Overall length to allow for a minimum of 1/8-inch intermittent flexing, or per manufacturer’s recommendations for additional motion.

2.2 RESTRAINED VIBRATION ISOLATION ROOF-CURB RAILS

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. Isolation Technology, Inc.

4. Kinetics Noise Control.

5. Mason Industries.

6. Thybar Corporation.

7. Vibration Eliminator Co., Inc.

8. Vibration Isolation.

9. Vibration Mountings & Controls, Inc.

B. General Requirements for Restrained Vibration Isolation Roof-Curb Rails: Factory-assembled, fully enclosed, insulated, air- and watertight curb rail designed to resiliently support equipment and to withstand seismic and wind forces.

C. Lower Support Assembly: Formed sheet-metal section containing adjustable and removable steel springs that support upper frame. Upper frame shall provide continuous support for equipment and shall be captive to resiliently resist seismic and wind forces. Lower support assembly shall have a means for attaching to building structure and a wood nailer for attaching roof materials, and shall be insulated with a minimum of 2 inches of rigid, glass-fiber insulation on inside of assembly.

D. Spring Isolators: Adjustable, restrained spring isolators shall be mounted on 1/4-inch-thick, elastomeric vibration isolation pads and shall have access ports, for level adjustment, with removable waterproof covers at all isolator locations. Isolators shall be located so they are accessible for adjustment at any time during the life of the installation without interfering with the integrity of the roof.

1. Restrained Spring Isolators: Freestanding, steel, open-spring isolators with seismic or wind restraint.

a. Housing: Steel with resilient vertical-limit stops and adjustable equipment mounting and leveling bolt.

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

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

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

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

2. 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.

a. Resilient Material: Oil- and water-resistant standard neoprene or natural rubber..

E. Snubber Bushings: All-directional, elastomeric snubber bushings at least 1/4 inch thick.

F. Water Seal: Galvanized sheet metal with EPDM seals at corners, attached to upper support frame, extending down past wood nailer of lower support assembly, and counterflashed over roof materials.

PART 3 - EXECUTION

3.1 GENERAL

A. All vibration isolators and seismic restraint systems must be installed in strict accordance with the manufacturers written instructions and all certified submittal data.

B. Installation of vibration isolators and seismic restraints must not cause any change of position of equipment, piping or ductwork resulting in stresses or misalignment.

C. No rigid connections between equipment and the building structure shall be made that degrades the noise and vibration control system herein specified.

D. The contractor shall not install any equipment, piping, duct or conduit which makes rigid connections with the building unless isolation is not specified. Building includes, but is not limited to, slabs, beams, columns, studs and walls.

E. Coordinate work with other trades to avoid rigid contact with the building.

F. Any conflicts with other trades which will result in rigid contact with equipment or piping due to inadequate space or other unforeseen conditions should be brought to the architects/engineers attention prior to installation.

G. Corrective work necessitated by conflicts after installation shall be at the responsible contractors expense.

H. Bring to the architects/engineers attention any discrepancies between the specifications and the field conditions or changes required due to specific equipment selection, prior to

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I. Correct, at no additional cost, all installations which are deemed defective in workmanship and materials at the contractor’s expense.

J. Overstressing of the building structure must not occur because of overhead support of equipment. Contractor must submit loads to the structural engineer of record for approval. Generally bracing may occur from:

1. Flanges of structural beams.

2. Upper truss cords in bar joist construction.

3. Cast in place inserts or wedge type drill-in concrete anchors.

K. Type 12 cable restraints shall be installed slightly slack to avoid short circuiting the isolated suspended equipment, piping or conduit.

L. Type 12 cable assemblies are installed taut on non-isolated systems. Type 13 seismic solid braces may be used in place of cables on rigidly attached systems only.

M. At locations where Type 12 or 13 restraints are located, the support rods must be braced when necessary to accept compressive loads with Type 14 braces.

N. At locations where Type 12 cable restraints are installed on support rods with spring isolators, the spring isolation hangers must be Type 10A.

O. At all locations where Type 12 or 13 restraints are attached to pipe clevis, the clevis cross bolt must be reinforced with specification Type 15 braces.

P. Drill-in concrete anchors for ceiling and wall installation shall be Type 18, and 19 female wedge type for floor mounted equipment.

Q. Locate isolation hangers as near to the overhead support structure as possible.

R. All mechanical equipment shall be vibration isolated and seismically restrained as per the HVAC Vibration Control and Seismic Restraint Device Schedule Article.

3.2 VIBRATION ISOLATION OF PIPING

A. The first four pipe hangers in the main lines near the mechanical equipment shall be Type 11. Brace hanger rods with Type 14 clamps.

B. Horizontal runs in all other locations throughout the building shall be isolated by Type 10 and 10A hangers.

C. The first three isolators from isolated equipment will have the same static deflection as specified for the mountings under the connected equipment.

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D. If piping is connected to equipment hung from the structure, the first three hangers shall have 3/4-inch deflection for pipe sizes up to and including 3 inch, 1 -1/2 inch deflection for pipe sizes up to and including 6 inch, and 2-1/2 inch deflection thereafter.

E. Hangers shall be located as close to the overhead structure as practical.

F. Hanger locations that also have seismic restraints attached must have Type 10A Hangers.

G. Where piping connects to mechanical equipment install Type 24 stainless hoses.

3.3 SEISMIC RESTRAINT OF PIPING

A. Seismically restrain all piping listed. Use Type 12 cables if isolated. Type 12 or 13 restraints may be used on un-isolated piping.

1. Piping located in mechanical equipment rooms that is NPS 1-1/4 and larger.

2. All other piping NPS 2-1/2 and larger.

B. Transverse piping restraints shall be at 40 foot maximum spacing for all pipe sizes, except where lesser spacing is required to limit anchorage loads.

C. Longitudinal restraints shall be at 80 foot maximum spacing for all pipe sizes, except where lesser spacing is required to limit anchorage loads.

D. Where thermal expansion is a consideration, guides and anchors may be used as transverse and longitudinal restraints provided they have a capacity equal to or greater than the restraint loads in addition to the loads induced by expansion or contraction.

E. Transverse restraint for one pipe section may also act as a longitudinal restraint for a pipe section of the same size connected perpendicular to it if the restraint is installed within 24 inches of the elbow or tee or combined stresses are within allowable limits at longer distances.

F. Hold down clamps must be used to attach pipe to all trapeze members before applying restraints in a manner similar to clevis supports.

G. Branch lines may not be used to restrain main lines.

H. Connection to the structure must be made with a non-friction connection, i.e. no C-clamps.

I. Hanger locations that also have seismic restraints attached must have Type 10A Hangers.

J. Pipe Exclusions:

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1. Piping in mechanical rooms less than NPS 1 1/4.

2. All other piping less than NPS 2 1/2.

3. All piping suspended by clevis hangers where the distance from the top of the pipe to the suspension point is 12 inches or less.

4. All trapezed piping where the distance from the suspension point to the trapeze member is 12 inches or less.

5. If any suspension location in the run exceeds the above, the entire run must be braced.

3.4 VIBRATION ISOLATION OF DUCTWORK

A. All discharge runs for a distance of 50 feet from the connected equipment shall be isolated from the building structure by means of Type 10 hangers. Spring deflection shall be a minimum of 3/4-inch.

B. All duct runs having air velocity of 1000 fpm or more shall be isolated from the building structure by Type 11 hangers. Spring deflection shall be a minimum of 3/4-inch.

3.5 SEISMIC RESTRAINT OF DUCTWORK

A. Seismically restrain all ductwork with Type 12 or 13 restraints as listed below:

1. Restrain rectangular ducts with cross sectional area of 6 sq.ft. or larger.

2. Restrain round ducts with diameters of 28 inches or larger.

B. Transverse restraints shall occur at 30 foot intervals or at both ends of the duct run if less than the specified interval. Transverse restraints shall be installed at each duct turn and at each end of a duct run.

C. Longitudinal restraints shall occur at 60 foot intervals with at least one restraint per duct run. Transverse restraints for one duct section may also act as a longitudinal restraint for a duct section connected perpendicular to it if the restraints are installed within 4 feet of the intersection of the ducts and if the restraints are sized for the larger duct. Duct joints shall conform to SMACNA duct construction standards.

D. The ductwork must be reinforced at the restraint locations. Reinforcement shall consist of an additional angle on top of the ductwork that is attached to the support hanger rods.

Ductwork is to be attached to both upper angle and lower trapeze.

E. A group of ducts may be combined in a larger frame so that the combined weights and dimensions of the ducts are less than or equal to the maximum weight and dimensions of the duct for which bracing details are selected.

F. Walls, including gypsum board non bearing partitions, which have ducts running through them may replace a typical transverse brace. Provide channel framing around ducts and solid blocking between the duct and frame.

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G. Connection to the structure must be made with a non-friction connection, i.e. no C-clamps.

H. Hanger locations that also have seismic restraints attached must have Type 10A hangers.

I. Ductwork Exclusions:

1. Rectangular and square and ducts that are less than 6 square feet in cross sectional area.

2. Round duct less than 28 inches in diameter.

3. All trapezed ductwork where the distance from the suspension point to the trapeze member is 12 inches or less.

4. Ductwork hung with straps where the top of the duct is 12 inches or less from the suspension point and the strap has 2 #10 sheet metal screws within 2 inches of the top of the duct.

5. If any suspension location in the run exceeds the above, the entire run must be braced.

3.6 HVAC VIBRATION CONTROL AND SEISMIC RESTRAINT DEVICE SCHEDULE

A. Supported Equipment: Air Handling Units

1. Equipment Location: Rooftop

2. Pads: NA

3. Isolator Type: Restrained vibration isolation roof-curb rails

4. Base Type: No base, rails attached directly to equipment.

5. Minimum Deflection: 1.0 inches

B. Supported Equipment: Air Handling Units

1. Equipment Location: Mezzanines

2. Pads: Type 1

3. Isolator Type: NA.

4. Base Type: No base, Type 17 snubbers are attached directly to equipment.

5. Minimum Deflection: 0.25 inches

C. Supported Equipment: Centrifugal Fans, Inline Fans

1. Equipment Location: Paint Booth exhaust and Mezzanines

2. Pads: NA

3. Isolator Type: Type 6.

4. Base Type: No base, isolators attached directly to equipment.

5. Minimum Deflection: 1.50 inches.

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D. Suspended Equipment: In-line Fans, Unit Heaters, Centrifugal Fans, Inline Pumps

1. Equipment Location: All

2. Pads: NA

3. Isolator Type: Type 10A hangers with Type 12 seismic cable bracing and Type 14 seismic rod clamps.

4. Base Type: NA.

5. Minimum Deflection: 0.75 inches.

END OF SECTION 230548