PART 1 - GENERAL
1.1
RELATED DOCUMENTS
A.
1.2
Drawings and general provisions of the Contract, including General and Supplementary
Conditions and Division 01 Specification Sections, apply to this Section.
SUMMARY
A.
1.3
This Section includes the following:
1.
Isolation pads.
2.
Isolation mounts.
3.
Restrained elastomeric isolation mounts.
4.
Freestanding and restrained spring isolators.
5.
Housed spring mounts.
6.
Elastomeric hangers.
7.
Spring hangers.
8.
Spring hangers with vertical-limit stops.
9.
Pipe riser resilient supports.
10.
Resilient pipe guides.
11.
Restrained vibration isolation roof-curb rails.
12.
Seismic snubbers.
13.
Restraining braces and cables.
14.
Steel and inertia, vibration isolation equipment bases.
DEFINITIONS
A.
ASCE: American Society of Civil Engineers
B.
CBC: California Building Code
C.
IBC: International Building Code.
D.
ICC-ES: ICC-Evaluation Service.
1.4
PERFORMANCE REQUIREMENTS
A.
Wind-Restraint Loading
BSS SERVICE YARD RELOCATION
SIXTH STREET VIADUCT REPLACEMENT
WORK ORDER NO. E700224L
VIBRATION AND SEISMIC CONTROLS FOR
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1.
B.
1.5
Refer to General Notes on Structural drawings for wind speed, building classification
category and load requirements.
Seismic-Restraint Loading
1.
Refer to General Notes on Structural Drawings for site classification, building category
and general load requirements.
2.
Refer to Table 13.6-1 in the ASCE 7-05 for equipment seismic coefficients for mechanical
components.
ACTION 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.
3.
B.
a.
Tabulate types and sizes of seismic restraints, complete with report numbers and
rated strength in tension and shear as evaluated by an evaluation service member
of ICC-ES.
b.
Annotate to indicate application of each product submitted and compliance with
requirements.
Interlocking Snubbers: Include ratings for horizontal, vertical, and combined loads.
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, seismic forces required to select vibration isolators, seismic restraints, and for
designing vibration isolation bases.
a.
Coordinate design calculations with wind load calculations required for equipment
mounted outdoors. Comply with requirements in other Division 23 Sections for
equipment mounted outdoors.
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.
Vibration Isolation Base Details: Detail overall dimensions, including anchorages and
attachments to structure and to supported equipment. Include auxiliary motor slides and
rails, base weights, equipment static loads, power transmission, component
misalignment, and cantilever loads.
4.
Seismic-Restraint Details:
a.
Design Analysis: To support selection and arrangement of seismic restraints.
Include calculations of combined tensile and shear loads.
BSS SERVICE YARD RELOCATION
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WORK ORDER NO. E700224L
VIBRATION AND SEISMIC CONTROLS FOR
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1.6
b.
Details: Indicate fabrication and arrangement. Detail attachments of restraints to
the restrained items and to the structure. Show attachment locations, methods,
and spacings. 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.
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.
Preapproval and Evaluation Documentation: By an evaluation service member of
ICC-ES, showing maximum ratings of restraint items and the basis for approval
(tests or calculations).
INFORMATIONAL SUBMITTALS
A.
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.
B.
Qualification Data: For professional engineer and testing agency.
C.
Welding certificates.
D.
Field quality-control test reports.
1.7
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 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
A.
Basis-of-Design Product: Subject to compliance with requirements, provide M.W. Saussé
(Vibrex) or a comparable product by one of the following:
1.
Mason Industries.
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B.
2.
Amber/Booth Company, Inc.
3.
Kinetics Noise Control.
General Requirements
1.
Provide a maximum of four vibration isolators located at the corners of the equipment
unless approval is obtained for additional isolators. Where feasible, provide three
isolators.
2.
All vibration isolators shall have markings indicating known undeflected heights.
3.
All isolators shall operate in the linear portion of their load versus deflection curve. Load
versus deflection curves must be linear over a deflection range 50% above the design
deflection.
4.
Spring diameters shall be no less than 0.8 of the compressed height of the spring at rated
load. Springs shall have a minimum additional travel to solid equal to 50% of the rated
deflection.
5.
The ratio of lateral to vertical stiffness shall not be less than 0.5 or greater than 1.0.
6.
The vertical static deflection for each support point, based upon the load per isolator and
isolator stiffness, shall not differ by more than + or - 10%.
7.
Isolation above the resonant frequency shall follow the theoretical prediction based upon
an undamped single degree of freedom system.
8.
All neoprene mountings shall have a shore hardness of 50 to 60 after minimum aging of
20 days or corresponding oven aging.
9.
All vibration isolation equipment including but not limited to isolators, mountings,
brackets, frames etc. that are exposed to moisture or an outdoor environment shall be
coated as follows
10.
C.
a.
All steel parts to be hot-dipped galvanized.
b.
All bolts to be cadmium plated.
c.
All springs to be cadmium plated and neoprene coated.
Design deflections for vibration isolators shall be as listed in the Vibration Isolation
Schedule, except in the event of unacceptable levels of vibration when the equipment is
in operation, due to any of the resonances of the isolated systems coupling, by
coincidence, with any of the resonances of the building structure. In this event, the
contractor shall bear the cost of changing the isolators to alter the natural frequencies of
the isolated systems so that the amplitude of structural vibrations is reduced to
acceptable levels.
Pads Type P1: Neoprene Pad(s) and Bearing Plate(s): Neoprene pad shall be ribbed or waffled,
5/16 to 1/2 inch thick, 40 durometer, with a minimum 1/16-inch-thick steel bearing plate on top.
Size pad and bearing plate to receive 60 psi load. Provide single or multiple pads and plates in
series as specified, with 1/16-inch-thick steel shim between layers. Provide "NR + plate(s)" by
A/B, "W + plate(s) or WM" by Mason, "NPD + plate(s) or NGD" by Kinetics or equal.
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D.
Pads Type P2: Extra Thick Neoprene Pad(s) and Bearing Plate(s): Neoprene pad shall be
waffled, 3/4 inch thick, 30 or 40 or 50 durometer, as scheduled, with a minimum 1/16-inch thick
steel bearing plate on top. Pad areas shall be selected so no more than 15% and no less than
10% deflection occurs due to the supported load. Provide single or multiple pads and plates in
series as specified with 1/16-inch-thick steel shim between layers. Provide "Super W + plate(s)
or SWM" by Mason or equal.
E.
Pads Type P3: Neoprene Bushing for Bolt Holes in Pads: Bushings shall be minimum 3/16"
thick in all places and maximum 40 durometer. Provide steel washer to distribute bolt head
loads to bushing.
F.
Type D: is a molded neoprene element enclosed by a ductile housing. The isolator may be
utilized in compression, shear or tension. The isolator shall provide seismic restraint in any
direction up to 1.0g. The isolator shall be Mason Industries "BR" or approved equal.
G.
Spring Isolator S1: Unhoused Spring: Springs shall be designed and installed so their ends are
parallel before and after installation and during equipment operation.
H.
1.
Outside Spring Diameter: Not less than 80 percent of the compressed height of the
spring at rated load.
2.
Minimum Additional Travel: 50 percent of the required deflection at rated load.
3.
Lateral Stiffness: More than 80 percent of rated vertical stiffness.
4.
Overload Capacity: Support 200 percent of rated load, fully compressed, without
deformation or failure.
5.
Top Plate and Adjustment Bolt: Threaded top plate with adjustment bolt and cap screw to
fasten and level equipment.
6.
Baseplate: Each isolator shall have a steel base plate with mounting bolt holes and a
ribbed or waffled neoprene friction pad permanently adhered to the bottom. The pad shall
be 5/16 to 1/2 inch thick, 40 durometer hardness, and sized for a load of 60 psi. Provide
"SW" by A/B, "SLFH" by Mason, or "FDS" by Kinetics or equal.
Restrained Spring Isolators RS1: Spring with Seismic Restraint and Vertical Travel Limit: with
the addition of steel columns on either side of the spring to provide seismic restraint and
accommodate vertical travel limit stops.
1.
Housing: Steel with resilient vertical-limit stops to prevent spring extension due to weight
being removed; factory-drilled baseplate permanently bonded to a friction pad of 5/16 to
1/2 inch- thick ribbed or waffled neoprene isolator pad, 40 durometer hardness, and sized
for a load of 60 psi attached to baseplate underside; and adjustable equipment mounting
and leveling bolt that acts as blocking during installation.
2.
Restraint: Mount shall resist a seismic acceleration in any direction of at least 0.5 G or as
required by the relevant codes. Travel limit stops shall be capable of serving as blocking
during erection of the equipment. A minimum clearance of 1/4 inch shall be maintained
around restraining bolts and between the limit stops and the spring so as not to interfere
with the spring action.
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.
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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.
I.
Elastomeric Hangers H1: A double-deflection neoprene-in-shear element contained in a steel
housing. It shall be formed with a projecting neck bushing for the hole in the hanger housing
that will prevent metal-to-metal contact between the hanger rod and the housing. The diameter
of the hole in the housing shall be sufficient to permit the hanger rod to swing through a 30o arc
before contacting the hanger housing. Neoprene shall be no harder than 50 durometer. Provide
"BRD" by A/B, "HD" by Mason, "RH" by Kinetics or equal.
J.
Spring Hanger H2: Vibration isolation hangers shall contain a laterally-stable steel spring set in
a neoprene cup manufactured with a bushing to prevent short-circuiting of the hanger rod as it
passes through the hanger housing. Spring diameters and hanger housing lower hole sizes
shall be large enough to permit the hanger rod to swing through a 30° arc before contacting the
housing. Provide "30" by Mason or equal.
K.
1.
Frame: Steel, fabricated for connection to threaded hanger rods and to allow for a
maximum of 30 degrees of angular hanger-rod misalignment without binding or reducing
isolation efficiency.
2.
Outside Spring Diameter: Not less than 80 percent of the compressed height of the
spring at rated load.
3.
Minimum Additional Travel: 50 percent of the required deflection at rated load.
4.
Lateral Stiffness: More than 80 percent of rated vertical stiffness.
5.
Overload Capacity: Support 200 percent of rated load, fully compressed, without
deformation or failure.
6.
Elastomeric Element: Molded, oil-resistant neoprene minimum 1/4 inch thick and
maximum 50 durometer. Steel-washer-reinforced cup to support spring and bushing
projecting through bottom of frame designed to properly distribute the spring load on the
neoprene and prevent its crushing.
7.
Self-centering hanger rod cap to ensure concentricity between hanger rod and support
spring coil.
Spring Hanger H3: Precompressed Spring Hanger delivered precompressed to their planned
installed deflection to keep pipes or equipment steady during installation. Hangers shall be
designed with a slow-release mechanism to free the spring after installation is complete and the
spring is fully loaded. Vibration isolation hangers shall contain a laterally-stable steel spring set
in a neoprene cup manufactured with a bushing to prevent short-circuiting of the hanger rod as
it passes through the hanger housing. Spring diameters and hanger housing lower hole sizes
shall be large enough to permit the hanger rod to swing through a 30° arc before contacting the
housing. Great care shall be taken to see that all springs are free to oscillate 0.25". Deflection
shall be clearly indicated by means of a scale. Provide "PC30" by Mason or equal.
1.
Frame: Steel, fabricated for connection to threaded hanger rods and to allow for a
maximum of 30 degrees of angular hanger-rod misalignment without binding or reducing
isolation efficiency.
2.
Outside Spring Diameter: Not less than 80 percent of the compressed height of the
spring at rated load.
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L.
M.
3.
Minimum Additional Travel: 50 percent of the required deflection at rated load.
4.
Lateral Stiffness: More than 80 percent of rated vertical stiffness.
5.
Overload Capacity: Support 200 percent of rated load, fully compressed, without
deformation or failure.
6.
Elastomeric Element: Molded, oil-resistant neoprene minimum 1/4 inch thick and
maximum 50 durometer. Steel-washer-reinforced cup to support spring and bushing
projecting through bottom of frame designed to properly distribute the spring load on the
neoprene and prevent its crushing.
7.
Self-centering hanger rod cap to ensure concentricity between hanger rod and support
spring coil.
Spring Hangers with Vertical-Limit Stop H3: Combination coil-spring and elastomeric-insert
hanger with spring and insert in compression and with a vertical-limit stop.
1.
Frame: Steel, fabricated for connection to threaded hanger rods and to allow for a
maximum of 30 degrees of angular hanger-rod misalignment without binding or reducing
isolation efficiency.
2.
Outside Spring Diameter: Not less than 80 percent of the compressed height of the
spring at rated load.
3.
Minimum Additional Travel: 50 percent of the required deflection at rated load.
4.
Lateral Stiffness: More than 80 percent of rated vertical stiffness.
5.
Overload Capacity: Support 200 percent of rated load, fully compressed, without
deformation or failure.
6.
Elastomeric Element: Molded, oil-resistant rubber or neoprene.
7.
Adjustable Vertical Stop: Steel washer with neoprene washer "up-stop" on lower
threaded rod.
8.
Self-centering hanger rod cap to ensure concentricity between hanger rod and support
spring coil.
Piping Isolation Materials
1.
Flexible Pipe Connectors FPC: Flexible pipe connectors shall be fabricated of multiple
plies of nylon cord, fabric, and neoprene, vulcanized so as to become inseparable and
homogeneous. Straight connectors shall be formed into a double sphere shape. Elbow
connectors shall have a single sphere shape at the curve of the unit. Flexible connectors
shall be able to accept compressive, elongating, transverse, and angular movements.
Flexible connectors shall be selected and specially outfitted if necessary to suit the
system temperature, pressure, and fluid type. Connectors for pipe sizes 2 inches and
smaller shall have threaded female union couplings on each end. Larger sizes shall be
fitted with metallic flange couplings. Control cables shall be provided if required. Provide
"MFDEJ” or “SFDEJ" by Mason or approved equal.
2.
Pipe Riser Resilient Support RPAG: All-directional, acoustical pipe anchor consisting of
2 steel tubes separated by a minimum of 1/2-inch- thick neoprene. Maximum neoprene
durometer 50. Include steel and neoprene vertical-limit stops arranged to prevent vertical
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travel in both directions. Design support for a maximum load on the isolation material of
500 psig and for equal resistance in all directions.
2.2
3.
Resilient Pipe Sleeves RPS1: Resilient Pipe Sleeve at Support or Construction
Penetration: Sleeve shall consist of a formed and stiffened galvanized steel sleeve lined
on the inside with moisture and vermin resistant felt bonded to the metal sleeve and
1/2-inch thick. Sleeve inside diameter shall equal pipe outside diameter in each
application. Sleeve shall be split longitudinally so it can be snapped over pipes and
reclosed without damage. Sleeve lengths shall be as recommended by the manufacturer
for the given diameters, but shall not be less than 3 inches. Provide "PR-Isolator" by
Porter-Roemer, "Trisolator" by Stoneman Engineering or approved equal.
4.
Resilient Pipe Sleeves RPS2: Resilient Pipe Sleeve at Construction Penetration: This unit
shall consist of two bolted pipe halves with 3/4 inch or thicker neoprene sponge bonded
to the inner faces. The seal shall be tightenable around the pipe to eliminate clearance
between the inner sponge face and the piping. Sleeve shall be 2 inches longer than the
thickness of the construction it penetrates. Where pipe temperatures exceed
240 degrees F, use 10-pcf-density glass fiber insulation in lieu of sponge neoprene.
Provide "SWS" by Mason, "PS-1-D" by Kinetics or approved equal.
FLEXIBLE DUCT CONNECTORS
A.
2.3
Flexible duct connectors shall be woven fiber-glass fabric material with a minimum weight of
24 oz./sq. yd. Connectors shall be minimum of 4-inches long and allow 1-inch of slack at
connections. Flexible duct connectors shall have metal collar frames at each end of
connections. Flexible Duct Connectors shall be Duro Dyne Durolon or equal.
RESTRAINED VIBRATION ISOLATION ROOF-CURB RAILS (TYPE C1)
A.
Basis-of-Design Product: Subject to compliance with requirements, provide M.W. Saussé or a
comparable product by one of the following:
1.
Amber/Booth Company, Inc.
2.
Kinetics Noise Control.
3.
Mason Industries.
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.
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1.
2.
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.
e.
Overload Capacity: Support 200 percent of rated load, fully compressed, without
deformation or failure.
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.
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. Provision shall be made for access ports with waterproof covers at the spring
location and 2-inch thermal insulation on the sides of the lower curb.
2.4
VIBRATION ISOLATION EQUIPMENT BASES
A.
Basis-of-Design Product: Subject to compliance with requirements, provide M.W. Saussé
(Vibrex) or a comparable product by one of the following:
1.
Amber/Booth Company, Inc.
2.
Kinetics Noise Control.
3.
Mason Industries.
B.
Base BS1: No Frame Required for Floor Mounting: This base mounting method shall be used
only with small pieces of equipment that have an integral casing or base frame that is
adequately strong to be supported directly on vibration isolators without deforming the casing or
frame or affecting equipment or isolator operation to any significant or noticeable extent. Place
vibration isolators directly under equipment or connect steel height-saving brackets to the sides
of the equipment and place isolators under brackets. Equipment manufacturer shall approve
such mounting.
C.
Steel Base BS2: Factory-fabricated, welded, structural-steel bases and rails.
1.
Design Requirements: Lowest possible mounting height with not less than 1-inch
clearance above the floor. Include equipment anchor bolts and auxiliary motor slide
bases or rails. Frames may be rectangular or tee-shaped in plan. The depth of steel
frame base members shall be minimum one-tenth the longest dimension of the base.
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Frame bases shall include side-mounting height-saving brackets for attachment to
vibration isolators. Provide "SFB" by A/B, "WF" by Mason, "SFB" by Kinetics or equal.
a.
D.
2.
Structural Steel: Steel shapes, plates, and bars complying with ASTM A 36/A 36M. Bases
shall have shape to accommodate supported equipment.
3.
Support Brackets: Factory-welded steel brackets on frame for outrigger isolation
mountings and to provide for anchor bolts and equipment support.
Inertia Base BS3: Factory-fabricated, welded, structural-steel bases and rails ready for
placement of cast-in-place concrete. Concrete inertia bases for floor-mounted equipment shall
be formed of stone-aggregate concrete (150 lb/cu ft) and appropriate steel reinforcing cast
between perimeter structural steel sections. The steel frame and reinforcement shall be
supplied by the vibration isolator manufacturer. Concrete shall be provided and poured by the
Contractor on site Inertia bases shall be built to form a rigid base that will not twist, rack,
deform, deflect, or crack in any manner. Provide "Custom" by A/B, "K" by Mason, "CIB" by
Kinetics or equal.
1.
Design Requirements: Lowest possible mounting height with not less than 2-inch or
3 percent of the shorter base dimension, whichever is greater clearance above the floor.
Include equipment anchor bolts and auxiliary motor slide bases or rails.
a.
2.5
Include supports for suction and discharge elbows for pumps.
Include supports for suction and discharge elbows for pumps.
2.
Structural Steel: Steel shapes, plates, and bars complying with ASTM A 36/A 36M. Bases
shall have shape to accommodate supported equipment.
3.
Support Brackets: Factory-welded steel brackets on frame for outrigger isolation
mountings and to provide for anchor bolts and equipment support.
4.
Fabrication: Fabricate steel templates to hold equipment anchor-bolt sleeves and
anchors in place during placement of concrete. Obtain anchor-bolt templates from
supported equipment manufacturer.
RESTRAINED VIBRATION ISOLATION ROOF-CURB RAILS (TYPE C1)
A.
Basis-of-Design Product: Subject to compliance with requirements, provide M.W. Saussé or a
comparable product by one of the following:
1.
Amber/Booth Company, Inc.
2.
Kinetics Noise Control
3.
Mason Industries
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
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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.
2.
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.
e.
Overload Capacity: Support 200 percent of rated load, fully compressed, without
deformation or failure.
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.
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. Provision shall be made for access ports with waterproof covers at the spring
location and 2-inch thermal insulation on the sides of the lower curb.
2.6
SEISMIC-RESTRAINT DEVICES
A.
Basis-of-Design Product: Subject to compliance with requirements, provide M.W. Saussé or a
comparable product by one of the following:
1.
Amber/Booth Company, Inc.
2.
Cooper B-Line, Inc.; a division of Cooper Industries
3.
Hilti, Inc.
4.
Kinetics Noise Control
5.
Mason Industries
6.
Unistrut; Tyco International, Ltd.
BSS SERVICE YARD RELOCATION
SIXTH STREET VIADUCT REPLACEMENT
WORK ORDER NO. E700224L
VIBRATION AND SEISMIC CONTROLS FOR
HVAC PIPING AND EQUIPMENT
23 0548 - 11
05/29/15
B.
C.
General Requirements for Restraint Components: Rated strengths, features, and applications
shall be as defined in reports by an evaluation service member of ICC-ES .
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.
2.
Channel Support System: MFMA-3, shop- or field-fabricated support assembly made of
slotted steel channels with accessories for attachment to braced component at one end
and to building structure at the other end and other matching components and with
corrosion-resistant coating; and rated in tension, compression, and torsion forces.
3.
Restraint Cables: ASTM A 603 galvanized -steel cables with end connections made of
steel assemblies with thimbles, brackets, swivel, and bolts designed for restraining cable
service; and with a minimum of two clamping bolts for cable engagement.
4.
Hanger Rod Stiffener: Steel tube or steel slotted-support-system sleeve with internally
bolted connections to hanger rod.
5.
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.
6.
Bushing Assemblies for Wall-Mounted Equipment Anchorage: Assemblies of neoprene
elements and steel sleeves designed for rigid equipment mountings, and matched to type
and size of attachment devices used.
7.
Resilient Isolation Washers and Bushings: One-piece, molded, oil- and water-resistant
neoprene, with a flat washer face.
8.
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.
9.
Adhesive Anchor Bolts: Drilled-in and capsule anchor system containing polyvinyl or
urethane methacrylate-based resin and accelerator, or injected polymer or hybrid mortar
adhesive. Provide anchor bolts and hardware with 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.
Type I, Equipment Not Vibration Isolated
1.
D.
Attach to the structure in accordance with the Paragraph 2.5.B.
Type II, Vibration Isolated Equipment
1.
Mount all vibration isolated equipment on rigid steel frames as described in the vibration
control specifications unless the equipment manufacturer certifies direct attachment
capability.
2.
Each isolated frame shall have a minimum of four all directional seismic snubbers located
as close to the vibration isolators as possible.
3.
The snubber shall consist of interlocking steel members restrained by snubbing material
made of bridge bearing neoprene.
BSS SERVICE YARD RELOCATION
SIXTH STREET VIADUCT REPLACEMENT
WORK ORDER NO. E700224L
VIBRATION AND SEISMIC CONTROLS FOR
HVAC PIPING AND EQUIPMENT
23 0548 - 12
05/29/15
E.
F.
2.7
4.
The snubbers shall contain an elastomeric neoprene one-piece bushing that is
replaceable and a minimum of 1/4 inch thick. Snubbers shall be manufactured with an air
gap between hard and resilient material of not less than 1/8 inch or more than 1/4 inch.
The neoprene bushing shall be capable of rotation to verify that no short circuiting of the
vibration isolator exists. Shim snubbers as required to maintain clearances.
5.
The snubber end cap shall be removable for inspection of snubber internal clearances.
Type III, Seismic Restraint of Suspended Piping
1.
Support all piping and ductwork systems per SMACNA "Guidelines for Seismic Restraints
of Mechanical Systems and Plumbing Piping Systems" and 2010 California Building
Code.
2.
Provide restraints for all trapeze mounted piping where the total supported weight is
greater than or equal to a 2-1/2 inch pipe, except in equipment rooms where all trapeze
mounted piping weight is greater or equal to 1-1/4 inch pipe.
3.
Provide restraints for all piping 1-1/4 inch and larger located in boiler rooms, mechanical
equipment rooms and refrigeration machinery rooms.
4.
Provide restraints for all fuel gas and oil piping, medical gas piping and compressed air
piping 1 inch and larger.
5.
Cable shall be installed with sufficient slack to avoid short circuiting the vibration isolation.
Type IV, Suspended Equipment
1.
Utilize a slack cable restraint system.
2.
Cables shall be installed with sufficient slack to avoid short circuiting the vibration
isolation.
THRUST RESTRAINT MATERIALS
A.
Restraint TR1: Neoprene Restraint: Thrust restraint shall be custom fabricated using a Type B1
neoprene-in-shear isolator and a steel angle. Neoprene isolator bolted to one angle leg opposes
equipment thrust; second angle leg bolted to appropriate structure. The steel angle shall be
sufficiently rigid and the mounting sufficiently sized and secure to resist the lateral movement of
equipment during on-off cycle.
B.
Restraint TR2: Steel Spring Restraint: Thrust restraint shall consist of a spring element in series
with a neoprene cup. The unit shall be designed to have the same deflection as specified for the
base mountings or hangers supporting the equipment. The spring element shall be adjusted in
the field to allow for a maximum of 1/4-inch movement during starting or stopping of the
equipment. The assembly shall be furnished complete with rods and angle brackets for
attachment to both the equipment and the adjacent fixed structural anchor. Provide "WBI or
WBD" by Mason or approved equal.
2.8
FACTORY FINISHES
A.
Finish: Manufacturer's standard prime-coat finish ready for field painting.
B.
Finish: Manufacturer's standard paint applied to factory-assembled and -tested equipment
before shipping.
BSS SERVICE YARD RELOCATION
SIXTH STREET VIADUCT REPLACEMENT
WORK ORDER NO. E700224L
VIBRATION AND SEISMIC CONTROLS FOR
HVAC PIPING AND EQUIPMENT
23 0548 - 13
05/29/15
1.
Powder coating on springs and housings.
2.
All hardware shall be galvanized. Hot-dip galvanize metal components for exterior use.
3.
Baked enamel or powder coat for metal components on isolators for interior use.
4.
Color-code or otherwise mark vibration isolation and seismic- and wind-control devices to
indicate capacity range.
PART 3 - EXECUTION
3.1
EXAMINATION
A.
Examine areas and equipment to receive vibration isolation and seismic-control devices for
compliance with requirements for installation tolerances and other conditions affecting
performance.
B.
Examine roughing-in of reinforcement and cast-in-place anchors to verify actual locations before
installation.
C.
Proceed with installation only after unsatisfactory conditions have been corrected.
3.2
APPLICATIONS
A.
Multiple Pipe Supports: Secure pipes to trapeze member with clamps approved for application
by an evaluation service member of ICC-ES.
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.
3.3
VIBRATION-CONTROL AND SEISMIC-RESTRAINT DEVICE INSTALLATION
A.
B.
Equipment Restraints
1.
Install seismic snubbers on HVAC equipment mounted on vibration isolators. Locate
snubbers as close as possible to vibration isolators and bolt to equipment base and
supporting structure.
2.
Install resilient bolt isolation washers on equipment anchor bolts where clearance
between anchor and adjacent surface exceeds 0.125-inch.
3.
Install seismic-restraint devices using methods approved by an evaluation service
member of ICC-ES providing required submittals for component.
Piping Restraints
1.
Comply with requirements in MSS SP-127.
2.
Space lateral supports a maximum of 40 feet o.c., and longitudinal supports a maximum
of 80 feet o.c.
BSS SERVICE YARD RELOCATION
SIXTH STREET VIADUCT REPLACEMENT
WORK ORDER NO. E700224L
VIBRATION AND SEISMIC CONTROLS FOR
HVAC PIPING AND EQUIPMENT
23 0548 - 14
05/29/15
3.
C.
D.
E.
Brace a change of direction longer than 12 feet.
Piping Isolation
1.
Provide piping isolation as indicated in specification or as noted on drawings.
2.
Unless otherwise specified, provide resilient support for all HVAC pipes throughout the
building. No such piping is to come into rigid contact with the building.
3.
Support all piping in mechanical equipment rooms on Type H2 or H3 springs sized for
minimum 1-inch static deflection, unless otherwise noted.
4.
Support on vibration isolators all piping outside of mechanical equipment rooms which is
connected to and within a 30-foot radius of a vibration-isolated piece of equipment. If the
piece of equipment is supported on neoprene isolators, support pipes on Type B1 or H1
isolators sized for minimum 0.35-inch deflection. If the piece of equipment is supported
on spring isolators, support pipes on Type B2 or H2 or H3 springs sized for minimum 1inch deflection.
5.
Throughout the rest of the building not covered in Paragraph 3 or 4 above, use RPS1
resilient pipe sleeves for support. An alternate to this is 1-inch-thick, 10 pcf-density glass
fiber pipe insulation with suitable bearing plates to prevent crushing of insulation and
without any steel pin or other rigid connection from plate to pipe through insulation.
Installation of Resilient Pipe Supports
1.
Provide Type RPS1 or RPS2 or Custom resilient pipe sleeves wherever pipes penetrate
construction.
2.
Provide Type RPAG resilient pipe anchor/guide where anchors and / or guides are
required in horizontal and vertical piping. Connect RPAG units to heavy structure only.
3.
Release restraining washers and nuts in order to "free" all precompressed spring
hangers.
Installation of Floor and Rooftop Mounted Equipment
1.
Unless otherwise shown or specified, all base-mounted equipment shall be set on 4-inch
thick, hardrock concrete housekeeping pads. Vibration isolators and seismic restraints
shall be bolted to the housekeeping pad. The pad dimensions shall exceed the
equipment footprint (including floor mounts) by at least 24" in each direction (i.e.
12 inches per side).
2.
Unless otherwise indicated, a minimum clearance of 1 inch shall be provided between the
top of a housekeeping pad or floor or roof and the underside of an equipment unit or steel
base frame that is vibration-isolated. The minimum clearance where a concrete inertia
block is used shall be 2 inches or 3 percent of the base's smaller dimension, whichever is
larger. This space shall be cleaned thoroughly of all dirt and debris.
3.
For isolation equipment (Mounts S1 and RS1) with neoprene pads bearing directly on
structure, fasten the isolator base plates to the building structure with suitable bolts.
Isolate steel bolts from steel base plates with neoprene bushings or washers and sleeves
(Mount Type P3) minimum 1/4 inch thick and maximum 40 durometer hardness. Provide
steel washers to distribute bolt head loads to neoprene bushings or washers below. Size
bolt holes in isolator bases to account for neoprene bushings or sleeves.
BSS SERVICE YARD RELOCATION
SIXTH STREET VIADUCT REPLACEMENT
WORK ORDER NO. E700224L
VIBRATION AND SEISMIC CONTROLS FOR
HVAC PIPING AND EQUIPMENT
23 0548 - 15
05/29/15
4.
All bases for pumps shall be of sufficient area to support any required pipe stanchions
below pipe elbows.
5.
Bases for boilers shall be of sufficient area to support draft fans, if included.
6.
Fans and pumps and their respective motors shall always be mounted on a common
base.
7.
Cooling towers: seismic restraints shall be provided between the grillage and dunnage
steel or structure. Seismic restraints shall be installed and adjusted after isolators have
been adjusted. Chillers shall be treated similarly.
8.
Wind loads shall be accounted for in rooftop installations, including appropriate snubbers
and slack-cable restraints.
9.
Vibration isolation curbs shall be made weathertight by sealing with flexible aluminum
flashing or closed-cell neoprene or flexible vinyl all around the periphery. This
weatherproofing shall in no way inhibit the vibration isolation of the spring elements. A
closed-cell sponge gasket shall be provided between the equipment unit and the curb to
form a weathertight seal.
F.
Install cables so they do not bend across edges of adjacent equipment or building structure.
G.
Install seismic-restraint devices using methods approved by an evaluation service member of
ICC-ES providing required submittals for component.
H.
Install bushing assemblies for anchor bolts for floor-mounted equipment, arranged to provide
resilient media between anchor bolt and mounting hole in concrete base.
I.
Install bushing assemblies for mounting bolts for wall-mounted equipment, arranged to provide
resilient media where equipment or equipment-mounting channels are attached to wall.
J.
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.
K.
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.
Adhesive Anchors: Clean holes to remove loose material and drilling dust prior to
installation of adhesive. Place adhesive in holes proceeding from the bottom of the hole
and progressing toward the surface in such a manner as to avoid introduction of air
pockets in the adhesive.
5.
Set anchors to manufacturer's recommended torque, using a torque wrench.
BSS SERVICE YARD RELOCATION
SIXTH STREET VIADUCT REPLACEMENT
WORK ORDER NO. E700224L
VIBRATION AND SEISMIC CONTROLS FOR
HVAC PIPING AND EQUIPMENT
23 0548 - 16
05/29/15
6.
L.
3.4
Install zinc-coated steel anchors for interior and stainless-steel anchors for exterior
applications.
Installation of Thrust Restraints: Provide horizontal thrust restraints as scheduled for fans
delivering large air quantities and with a tendency to rock back on their spring mounts. Install
thrust restraints parallel to the axis of air delivery and in pairs on opposite sides of the fan.
ACCOMMODATION OF DIFFERENTIAL SEISMIC MOTION
A.
3.5
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. Comply with requirements in
Section 23 21 13 – Hydronic Piping for piping flexible connections.
FIELD QUALITY CONTROL
A.
Testing Agency: Engage a qualified testing agency to perform tests and inspections.
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 Owner’s Representative, before connecting
anchorage device to restrained component (unless postconnection testing has been
approved), and with at least seven days' advance notice.
3.
Obtain Owner’s Representative 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 by
Architect.
5.
Test to 90 percent of rated proof load of device.
6.
Measure isolator restraint clearance.
7.
Measure isolator deflection.
8.
Verify snubber minimum clearances.
9.
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.
3.6
ADJUSTING
A.
Adjust isolators after piping system is at operating weight.
BSS SERVICE YARD RELOCATION
SIXTH STREET VIADUCT REPLACEMENT
WORK ORDER NO. E700224L
VIBRATION AND SEISMIC CONTROLS FOR
HVAC PIPING AND EQUIPMENT
23 0548 - 17
05/29/15
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.
3.7
HVAC VIBRATION-CONTROL AND SEISMIC-RESTRAINT DEVICE SCHEDULE
A.
HVAC PIPING VIBRATION ISOLATION SCHEDULE
Design
Deflection
Description
Seismic Restraint
Type
Type
Main Horizontal Runs
N/A
RPS1
III
Suspended within
Mechanical Room
1.0”
H3
III
Located within 30’ radius of
vibrating equipment with
type H1 hanger
N/A
B1 or H1
III
Located within 30’ radius of
vibrating equipment with
type H2 or H3 hanger
1.0”
B2, H2 or H3
III
Floor Supported
1.0”
S1
-
Main Vertical Risers
N/A
RPAG
N/A
Support at Roof Level
1.0”
-
All connections to pumps
N/A
FPC
1.
B.
Isolator
N/A
Type P2 pad to be located between chilled water supply and return pipes and support
stand.
HVAC EQUIPMENT VIBRATION ISOLATION SCHEDULE
Equipment Mark
Design
Deflection
Isolator
Frame
Seismic Restraint
Type
Type
Type
All other Pumps
1.0”
RS1
BS2
II
Fans (5hp and
1.0”
RS1
BS2
II
BSS SERVICE YARD RELOCATION
SIXTH STREET VIADUCT REPLACEMENT
WORK ORDER NO. E700224L
VIBRATION AND SEISMIC CONTROLS FOR
HVAC PIPING AND EQUIPMENT
23 0548 - 18
05/29/15
below, 750RPM and
above)
Fan Coil Units
1.0”
H2
-
IV
Condensing Units
1.0”
S2
-C1
II
1.
Frame may be omitted if a written undertaking can be obtained from equipment
manufacturer, stating that factory-supplied frame will be suitable for isolator point-loading
and will be adequate seismically, per local Code requirements.
2.
Where type RS1 spring mounts with vertical travel limit stops are specified, seismic
snubbers may be omitted if a Licensed Structural Engineer verifies that limit stop on RS1
mount will provide sufficient seismic restraint to conform with local Code requirements.
3.
Provide seismic restraint calculations for all connections of equipment to support
structure.
4.
Thrust restraints (TR-2) providing 1-inch deflection shall be installed on equipment when
the air thrust is greater than 10 percent of the equipment weight.
5.
For all other equipment refer to details on M8 Series Drawings.
END OF SECTION
BSS SERVICE YARD RELOCATION
SIXTH STREET VIADUCT REPLACEMENT
WORK ORDER NO. E700224L
VIBRATION AND SEISMIC CONTROLS FOR
HVAC PIPING AND EQUIPMENT
23 0548 - 19
05/29/15