substitution request - Alliance Construction Solutions

to equipment located in basements and hangs from ceiling under occupied spaces, the
first three hangers shall have 0.75” deflection for pipe sizes up to and including 3”, 1.5”
deflection for larger pipe sizes up to and including 6”, and 2.5” deflection for pipe sizes
larger than 6”.) All other hangers and mounts shall have a minimum steel spring
deflection of 0.75”.) Hangers shall be located as close to the overhead structure as
practical.
B. Equipment Room Seals: All piping passing through equipment room walls, floors or
ceilings shall be protected against sound leakage by means of an acoustical wall seal as
described in Specification M.
C. Riser Isolation: Risers shall be suspended from Specification E hangers or supported by
Specification C mountings, with the piping anchored or guided with Specification N
anchors. Steel spring deflection shall be a minimum of 0.75” except in those expansion
locations where additional deflection is required to limit load changes to plus or minus
25% of the initial load.
D. Pipe guides shall consist of a telescopic arrangement of two sizes of steel tubing separated
by a minimum 1/2” thickness of 60 durometer neoprene. The height of the guides shall
be preset with a shear pin to allow vertical motion due to pipe expansion or contraction.
Shear pin shall be removable and reinsertable to allow for selection of pipe movement.
Guides shall be capable of ± 1-5/8” motion, or as required to meet specific location
requirements. Pipe guides shall be type VSG as manufactured by Mason Industries, Inc.
E. Duct Isolation: All discharge runs for a distance of 50 feet from the connected equipment
shall be isolated from the building structure by means of Specification F hangers or
Specification C floor supports. Spring deflection shall be a minimum of 0.75”.
F. Flexible Pipe Connections: All equipment that is supported by or mounted on vibration
isolators shall be piped with flexible connections. Specification “K” or Specification “L”
flexible connections shall be installed parallel to the equipment shaft insofar as practical
and on the equipment side of isolation valves.
G. Equipment Isolation: All mechanical equipment shall be mounted on vibration isolators to
prevent the transmission of vibration and mechanically transmitted sound to the building
structure. Vibration isolators shall be selected in accordance with the weight distribution so
as to produce reasonably uniform deflection. Isolator types shall be as noted on the
equipment schedule below.
EQUIPMENT VIBRATION ISOLATION SCHEDULE:
(Not all types of equipment listed below are necessarily used on this project.)
EQUIPMENT TYPE
Air Handling Units – Floor-Mounted
Air Handling Units – Structure-Hung
Condensers/Condensing Units
Project No.: 10145
550 15 th Street Dual Brand Hotel
03/16/2012
ISOLATOR SPECIFICATION
Mount Type B;
Connector Type K*
Hanger Type D;
Connector Type K*
Mount Type C;
Connector Type K
STATIC DEFLECTION
(INCHES)
0.75
23 0548 - 10 VIBRATION AND SEISMIC
CONTROLS FOR HVAC PIPING
AND EQUIPMENT