5.14 Vibration Isolation,
Equipment Insulation. All insulation material shall
comply with the fire and smoke hazard ratings indicated
Acoustical Isolation,
by ASTM-E84, NFPA 255 and UL 723. Accessories such as
adhesives, mastics, cements, tapes, etc. shall have the same
and Seismic Design for
or better component ratings. All equipment including air-
handling units, chilled and hot water pumps, and heat
Mechanical Systems
exchangers must be insulated in accordance with ASHRAE
Standard 90.1. All pumps shall have jacketing.
Noise and Vibration Isolation. Refer to and incorporate
Thermal Pipe Insulation for Plumbing Systems
the basic design techniques as described in Chapter 3
All sanitary sewer vents terminating through the roof shall
be insulated for a minimum of 1.83 meters (6 feet) below
Applications Handbook, Sound and Vibration Control.
the roof line to prevent condensation from forming and
Isolate all moving equipment in the building.
include a vapor barrier jacket on this insulation. All
Mechanical Room Isolation. Floating isolation floors
Insulation materials and accessories shall comply with the
shall be considered for major mechanical rooms located
fire and smoke hazard ratings indicated by ASTM-84,
in penthouses or at intermediate levels in mid-rise and
NFPA 255 and UL 723.
high-rise construction.
Domestic water piping shall be insulated in accordance
with ASHRAE Standard 90.1. All piping exposed in
Mechanical Shafts and Chases. Mechanical shafts and
plenums or above ceiling shall be insulated to prevent
chases shall be continuous and closed at the top and
condensation. All insulation materials and accessories
bottom. Any piping and ductwork shall be isolated as it
shall comply with the fire and smoke hazard ratings
enters the shaft to prevent propagation of vibration to the
indicated by ASTM-E84, NFPA 255 and UL 723.
building structure. All openings for ducts and piping
must be sealed. Shafts dedicated to gas piping must be
ventilated.
deflection, not by isolation efficiency. See ASHRAE Guide
Application Handbook for types and minimum
deflections. Specifications shall be worded so that
isolation performance becomes the responsibility of the
equipment supplier.
Concrete Inertia Bases. Inertia bases shall be provided for
reciprocating and centrifugal chillers, air compressors, all
pumps, axial fans above 300 RPM, and centrifugal fans
above 37.3 kW (50 hp).
151
MECHANICAL
ENGINEERING
5.14
Vibration Isolation, Acoustical Isolation, and Seismic Design for Mechanical Systems
Revised March 2005 PBS-P100
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