SECTION 15245

VIBRATION ISOLATION

PART	GENERAL

SECTION INCLUDES

Inertia bases.

Vibration isolation.

PRODUCTS FURNISHED BUT NOT INSTALLED UNDER THIS SECTION

Section 03300 - Concrete: Placement of isolators in floating floor slabs.

PRODUCTS INSTALLED BUT NOT FURNISHED UNDER THIS SECTION

Section 03300 - Concrete: Supply of concrete for placement by this Section.

RELATED SECTIONS

Section 03300 - Cast-in-Place Concrete.

Section 15121 - Piping Expansion Compensation.

Section 15140 - Supports and Anchors.

Section 16180 - Equipment Wiring Systems: Electrical characteristics and wiring connections.

PERFORMANCE REQUIREMENTS

Provide vibration isolation on motor driven equipment over 0.5 HP (0.35 kW), plus connected piping and ductwork.

Provide minimum static deflection of isolators for equipment as indicated.

Basement, Under 20 hp (15 kw)

a)	Under 400 rpm: [________]

b)	400 - 600 rpm: 1 inch (25 mm)

c)	600 - 800 rpm: 0.5 inch (12 mm)

d)	800 - 900 rpm: 0.2 inch (5 mm)

e)	1100 - 1500 rpm: 0.14 inch (4 mm)

f)	Over 1500 rpm: 0.1 inch (3 mm)

Basement, Over 20 hp (15 kw)

a)	Under 400 rpm: [________]

b)	400 - 600 rpm: 2 inch (50 mm)

c)	600 - 800 rpm: 1 inch (25 mm)

d)	800 - 900 rpm: 0.5 inch (12 mm)

e)	1100 - 1500 rpm: 0.2 inch (5 mm)

f)	Over 1500 rpm: 0.15 inch (4 mm)

Upper Floors, Normal

a)	Under 400 rpm: [________]

b)	400 - 600 rpm: 3.5 inch (90 mm)

c)	600 - 800 rpm: 2 inch (50 mm)

d)	800 - 900 rpm: 1 inch (25 mm)

e)	1100 - 1500 rpm: 0.5 inch (12 mm)

f)	Over 1500 rpm: 0.2 inch (5 mm)

Upper Floors, Critical

a)	Under 400 rpm: [________]

b)	400 - 600 rpm: [________]

c)	600 - 800 rpm: 3.5 inch (90 mm)

d)	800 - 900 rpm: 2 inch (50 mm)

e)	1100 - 1500 rpm: 1 inch (25 mm)

f)	Over 1500 rpm: 0.5 inch (12 mm)

Upper floor locations shall be considered critical unless otherwise indicated.

Use concrete inertia bases for fans having static pressure in excess of 3.5 inch WC (0.85 kPA) or motors in excess of 40 HP (30 kW), and on base mounted pumps over 10 HP (7.5 kW).

SUBMITTALS

Submit under provisions of Section [01300.] [________.]

Shop Drawings: Indicate inertia bases and locate vibration isolators, with static and dynamic load on each.

Product Data: Provide schedule of vibration isolator type with location and load on each.

Manufacturer's Installation Instructions: Indicate special procedures and setting dimensions.

Manufacturer's Certificate: Certify that isolators are properly installed and adjusted to meet or exceed [specified requirements]. [________.]

PROJECT RECORD DOCUMENTS

Submit under provisions of Section [01700.] [________.]

Record actual locations of hangers including attachment points.

PART	PRODUCTS

MANUFACTURERS

[__________________________________].

[__________________________________].

[__________________________________].

Substitutions: Under provisions of Section [01600]. [________].

INERTIA BASES

Structural Bases:

Design: Sufficiently rigid to prevent misalignment or undue stress on machine, and to transmit design loads to isolators and snubbers.

Construction: Welded structural steel with gusseted brackets, supporting equipment and motor with motor slide rails.

Concrete Inertia Bases:

Mass: Minimum of 1.5 times weight of isolated equipment.

Construction: Structured steel channel perimeter frame, with gusseted brackets and anchor bolts, adequately reinforced, concrete filled.

Connecting Point: Reinforced to connect isolators and snubbers to base.

Concrete: Reinforced 3,000 psi (20 mPa) concrete.

VIBRATION ISOLATORS

Open Spring Isolators:

Spring Isolators:

For Exterior and Humid Areas: Provide hot dipped galvanized housings and neoprene coated springs.

Code: Color code springs for load carrying capacity.

Springs: Minimum horizontal stiffness equal to 75 percent vertical stiffness, with working deflection between 0.3 and 0.6 of maximum deflection.

Spring Mounts: Provide with levelling devices, minimum 0.25 inch (6 mm) thick neoprene sound pads, and zinc chromate plated hardware.

Sound Pads: Size for minimum deflection of 0.05 inch (1.2 mm); meet requirements for neoprene pad isolators.

Restrained Spring Isolators:

Spring Isolators:

For Exterior and Humid Areas: Provide hot dipped galvanized housings and neoprene coated springs.

Code: Color code springs for load carrying capacity.

Springs: Minimum horizontal stiffness equal to 75 percent vertical stiffness, with working deflection between 0.3 and 0.6 of maximum deflection.

Spring Mounts: Provide with levelling devices, minimum 0.25 inch (6 mm) thick neoprene sound pads, and zinc chromate plated hardware.

Sound Pads: Size for minimum deflection of 0.05 inch (1.2 mm); meet requirements for neoprene pad isolators.

Restraint: Provide heavy mounting frame and limit stops.

Closed Spring Isolators:

Spring Isolators:

For Exterior and Humid Areas: Provide hot dipped galvanized housings and neoprene coated springs.

Code: Color code springs for load carrying capacity.

Type : Closed spring mount with top and bottom housing separated with neoprene rubber stabilizers.

Springs: Minimum horizontal stiffness equal to 75 percent vertical stiffness, with working deflection between 0.3 and 0.6 of maximum deflection.

Housings: Incorporate neoprene isolation pad meeting requirements for neoprene pad isolators, and neoprene side stabilizers with minimum 0.25 inch (7 mm) clearance.

Restrained Closed Spring Isolators:

Spring Isolators:

For Exterior and Humid Areas: Provide hot dipped galvanized housings and neoprene coated springs.

Code: Color code springs for load carrying capacity.

Type : Closed spring mount with top and bottom housing separated with neoprene rubber stabilizers.

Springs: Minimum horizontal stiffness equal to 75 percent vertical stiffness, with working deflection between 0.3 and 0.6 of maximum deflection.

Housings: Incorporate neoprene isolation pad meeting requirements for neoprene pad isolators, and neoprene side stabilizers with minimum 0.25 inch (7 mm) clearance and limit stops.

Spring Hanger:

Spring Isolators:

For Exterior and Humid Areas: Provide hot dipped galvanized housings and neoprene coated springs.

Code: Color code springs for load carrying capacity.

Springs: Minimum horizontal stiffness equal to 75 percent vertical stiffness, with working deflection between 0.3 and 0.6 of maximum deflection.

Housings: Incorporate [neoprene isolation pad meeting requirements for neoprene pad isolators] [rubber hanger with threaded insert].

Misalignment: Capable of 20 degree hanger rod misalignment.

Neoprene Pad Isolators:

Rubber or neoprene waffle pads.

30 durometer.

Minimum 1/2 inch (13 mm) thick.

Maximum loading 40 psi (275 kPa).

Height of ribs shall not exceed 0.7 times width.

Configuration: [Single layer.] [1/2 inch (13 mm) thick waffle pads bonded each side of 1/4 inch (6 mm) thick steel plate.]

Rubber Mount or Hanger: Molded rubber designed for 0.5 inches (13 mm) deflection with threaded insert.

Glass Fiber Pads: Neoprene jacketed pre-compressed molded glass fiber.

Seismic Snubbers:

Type: Non-directional and double acting unit consisting of interlocking steel members restrained by neoprene elements.

Neoprene Elements: Replaceable, minimum of 0.75 inch (18 mm) thick.

Capacity: 4 times load assigned to mount groupings at 0.4 inch (10 mm) deflection.

Attachment Points and Fasteners: Capable of withstanding 3 times rated load capacity of seismic snubber.

PART	EXECUTION

INSTALLATION

Install in accordance with manufacturer's instructions.

Install isolation for motor driven equipment.

Bases:

Set steel bases for one inch (25 mm) clearance between housekeeping pad and base.

Set concrete inertia bases for 2 inch (50 mm) clearance between housekeeping pad and base.

Adjust equipment level.

Install spring hangers without binding.

On closed spring isolators, adjust so side stabilizers are clear under normal operating conditions.

Prior to making piping connections to equipment with operating weights substantially different from installed weights, block up equipment with temporary shims to final height. When full load is applied, adjust isolators to load to allow shim removal.

Provide pairs of horizontal limit springs on fans with more than [6.0] [____] inch ([1.5] [____] kPa) static pressure, and on hanger supported, horizontally mounted axial fans.

Provide resiliently mounted equipment, piping, and ductwork with seismic snubbers. Each inertia base shall have minimum of four seismic snubbers located close to isolators. Snub equipment designated for post disaster use to 0.05 inch (1.5 mm) maximum clearance. Other snubbers shall have clearance between 0.15 inch (4 mm) and 0.25 inch (7 mm).

Support piping connections to isolated equipment resiliently [for scheduled distance.] [to nearest flexible pipe connector.] [as follows:]

Up to 4 Inch (100 mm) Diameter: First three points of support.

5 to 8 Inch (125 to 200 mm) Diameter: First four points of support.

10 inch (250 mm) Diameter and Over: First six points of support.

Select three hangers closest to vibration source for minimum 1.0 inch (25 mm) static deflection or static deflection of isolated equipment. Select remaining isolators for minimum 1.0 inch (25 mm) static deflection or 1/2 static deflection of isolated equipment.

Connect wiring to isolated equipment with flexible hanging loop.

MANUFACTURER'S FIELD SERVICES

Examine systems under provisions of Section [01400.] [________.]

Inspect isolated equipment after installation and submit report. Include static deflections.

PIPE ISOLATION SCHEDULE

Pipe Size	Isolated Distance from Equipment

Inch (mm)

1 (25)	120 diameters (3.0 m)

2 (50)	90 diameters (4.5 m)

3 (80)	80 diameters (6.0 m)

4 (100)	75 diameters (7.5 m)

6 (150)	60 diameters (9.0 m)

8 (200)	60 diameters (12.0 m)

10 (250)	54 diameters (13.5 m)

12 (300)	50 diameters (15.0 m)

16 (400)	45 diameters (18.0 m)

24 (600)	38 diameters (23.0 m)

Over 24 (600)	[________]

EQUIPMENT ISOLATION SCHEDULE

BASE	ISOLATOR

ISOLATED EQUIPMENT	Type Thickness	Type Deflection

Fire Pumps

HVAC Pumps

Direct Fired Air

Units

Fuel Fired Unit

Heaters

Reciprocating

Refrigerant

Compressors

Air Cooled

Condensing Units

Reciprocating Water

Chillers

Air Cooled Water

Chiller

Centrifugal Water

Chillers

Absorption Water

Chiller

Induced Draft

Cooling Tower

Blow Thru Cooling

Tower

Liquid Coolers

Air Cooled

Refrigerant

Condensers

Packaged Roof

Top Air

Conditioning Units

Computer Room Air

Conditioning Units

Pneumatic Controls

END OF SECTION