substitution request - Alliance Construction Solutions

H. Bring to the Architect's/Engineer's attention any discrepancies between the specifications
and the field conditions or changes required due to specific equipment selection, prior to
installation. Corrective work necessitated by discrepancies after installation shall be at the
responsible contractor's expense.
I. All installations which are deemed defective in materials and/or workmanship shall be
corrected at the responsible contractor's expense, at no additional cost to the Owner.
J. Overstressing of the building structure must not occur because of overhead support of
equipment. Contractor must submit loads to the structural engineer of record for
approval. Generally, bracing may occur from:
1. Flanges of structural beams.
2. Upper truss chords in bar joist construction.
3. Cast-in-place inserts or wedge type drill-in concrete anchors.
K. Vibration isolation manufacturer shall furnish integral structural steel bases as required.
Independent steel rails are not permitted on this project.
L. Install vibration isolation units between substrate and equipment as required for secure
operation and to prevent displacement by normal forces.
M. Air handling equipment and high pressure axial and centrifugal fans shall be protected
against excessive displacement which results from high air thrust in relation to the
equipment weight.
N. For air handling equipment, install thrust restraints as indicated, and also wherever thrust
exceeds 10% of equipment weight.
O. Locate isolation hangers as near to the overhead support structure as possible.
P. Adjust leveling devices as required to distribute loading uniformly onto isolators. Shim
units as required where substrate is not level.
Q. Install inertia base frames on isolator units so that minimum of 1” clearance below base
will result when frame is filled with concrete and supported equipment has been installed
and loaded for operation.
R. Weld riser isolator units in place as required to prevent displacement from loading and
operations.
S. Install flexible connectors and hoses on the equipment side of shut-off valves. Install hoses
horizontally and parallel to equipment shafts wherever possible.
3.04 VIBRATION ISOLATION:
A. Horizontal Pipe Isolation: The first three pipe hangers for the main lines near the
mechanical equipment shall be as described in Specification E. Horizontal runs in all other
locations throughout the building shall be isolated by hangers as described in Specification
D. Floor supported piping shall rest on isolators as described in Specification C. Heat
exchangers shall be considered part of the piping run. All Specification E hangers or the
first three Specification C mounts, as noted above, shall have the same static deflection as
specified for the mountings under the connected equipment. (Note: If piping is connected
Project No.: 10145
550 15 th Street Dual Brand Hotel
03/16/2012
23 0548 - 9 VIBRATION AND SEISMIC
CONTROLS FOR HVAC PIPING
AND EQUIPMENT