to the building must be reduced, the maximum
tolerable transmissibility, in percent, should be
determined and the blank filled with the appropriate
value. When it is not necessary to specify the
percent of transmissibility, the item in the
brackets will be deleted and brackets removed.
Recommended transmissibility in percentages is: 10
percent for equipment mounted in very critical
areas; 10 to 20 percent for critical areas; and 20
to 40 percent for noncritical areas. The drawings
should be checked to ensure that all structural and
equipment connection factors and the conditions
surrounding the equipment to be provided with the
vibration isolation units favorably influence the
effectiveness of the isolators. Where many items of
equipment require different transmission values,
based on the equipment location, the specification
may be revised to indicate the appropriate values on
the drawings.
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Necessary supports shall be provided for all equipment, appurtenances, and
pipe as required, including frames or supports. Housings shall be isolated
from the building structure. If mechanical vibration isolators are not
provided, vibration absorbing foundations shall be furnished. Each
foundation shall include isolation units consisting of machine and floor or
foundation fastenings, together with intermediate isolation material.
Other floor-mounted equipment shall be set on not less than a 150 mm 6 inch
concrete pad doweled in place. Concrete foundations for floor mounted
pumps shall have a mass equivalent to three times the weight of the
components, pump, base plate, and motor to be supported. In lieu of
concrete pad foundation, concrete pedestal block with isolators placed
between the pedestal block and the floor may be provided. Concrete
pedestal block shall be of mass not less than three times the combined
pump, motor, and base weights. Isolators shall be selected and sized based
on load-bearing requirements and the lowest frequency of vibration to be
isolated. Isolators shall limit vibration to [_____] percent at lowest
equipment rpm. Lines connected to pumps mounted on pedestal blocks shall
be provided with flexible connectors. Foundation drawings, bolt-setting
information, and foundation bolts shall be furnished prior to concrete
foundation construction for all equipment indicated or required to have
concrete foundations. Concrete for foundations and concrete-structured or
cast-cooling towers shall be as specified in Section 03300A CAST-IN-PLACE
STRUCTURAL CONCRETE. Equipment shall be properly leveled, aligned, and
secured in place in accordance with manufacturer's instructions.
3.2.1
Conditioner Solution Concentration
Contractor shall provide the conditioner solution concentration capable of
maintaining the humidity level specified on the drawings.
3.2.2
Automatic Controls
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NOTE: Change paragraph as required to coordinate
the central equipment controls with the air-side
system controls. In projects where this
specification is intended to produce control
equipment for existing air-side systems, this
SECTION 15500A
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