3.1.2
Suspension Vibration Isolators
Provide suspension isolation hangers for piping, suspended equipment, and
suspended equipment platforms in mechanical equipment rooms, [as indicated
and] as specified. For operating load static deflections of 6 mm 1/4 inch
or less, provide neoprene pads or single deflection neoprene isolators.
For operating load static deflections over 8 to 10 mm 5/16 to 3/8 inch,
provide double-deflection neoprene element isolators. For operating load
static deflections over 10 mm 3/8 inch, provide isolators with spring and
neoprene elements in series.
3.1.3
Vertical Stops
For machinery affected by wind pressure or having an operational weight
different from installed weight, provide resilient vertical limit stops
which prevent spring extension when weight is removed. Provide vertical
stops for machinery containing liquid, such as water chillers, evaporative
coolers, boilers, and cooling towers. Spring isolated or protected spring
isolated machinery must rock and move freely within limits of stops or
seismic restraint devices.
3.1.4
Thrust Restraints
Where required, provide pairs of thrust restraints, symmetrically installed
on both sides of the steady state line of thrust.
3.1.5
Flexible Pipe and Duct Connectors
Install flexible connectors in accordance with the manufacturer's
instructions. When liquid pulsation dampening is required, flexible
connectors with spherical configuration may be used. [Provide restraints
for pipe connectors at pumps to prevent connector failure upon pump
startup.]
[3.1.6
Seismic Snubbers
Provide snubbers as close as possible to each vibration isolator as
indicated. After installing and leveling of the machinery, adjust snubbers
in accordance with the snubber manufacturer's instructions.
]3.1.7
Machinery
**************************************************************************
NOTE: When maximum and minimum limits of equipment
size, weight, etc., are critical to the buildings'
structural design, these limits shall be indicated
or specified.
**************************************************************************
Provide vibration isolators, flexible connectors [and seismic snubbers] in
accordance with manufacturer's recommendations. Machinery with spring
isolators or protected spring isolators shall rock or move freely within
limits of stops or seismic snubber restraints.
3.1.7.1
Stability
Isolators shall be stable during starting and stopping of machinery without
traverse and eccentric movement of machinery that would damage or adversely
affect the machinery or attachments.
SECTION 15070N
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