3.1.8
[Piping] [and] [High Pressure Ductwork]
Provide vibration isolation for [piping] [and] [high pressure ductwork with
over 1494 Pa 6 inches water column]. The isolator deflections shall be
equal to or greater than the static deflection of the vibration isolators
provided for the connected machinery as follows:
[3.1.8.1
High Pressure Ductwork
For a distance of 15 meters 50 feet from fans, exhausters and blowers.
]3.1.8.2
Piping Connected to Vibration Isolated Machinery
For a distance of 15 meters 50 feet or 50 pipe diameters, whichever is
greater.
3.1.8.3
Steam Pressure Reducing Valves
Connected piping for a distance of 15 meters 50 feet or 50 pipe diameters,
whichever is greater.
3.1.8.4
Condenser Water
For the full length of the piping.
3.1.8.5
Chilled, Hot, and Dual Temperature Piping
For risers from pumps and for the first 6 meters 20 feet of the branch
connection of the main supply and return piping at each floor.
3.1.9
Water and Steam Distribution Piping Application
Resiliently support piping with combination spring and neoprene isolation
hangers. Provide spring elements with 16 mm 5/8 inch static deflection;
install the hanger with spacing so that the first harmonic natural
frequency is not less than 360 Hz. Provide double-deflection neoprene
elements. For the first two isolation hangers from the rotating equipment
of 90 mm 3 1/2 inch and smaller piping systems, ensure a deflection equal
to the equipment-isolation static deflection. For the first four piping
isolation hanger supports from rotating equipment of 100 mm 4 inch and
larger piping systems, use resilient hanger-rod isolators at a fixed
elevation regardless of load changes. Incorporate an adjustable preloading
device to transfer the load to the spring element within the hanger
mounting after the piping system has been filled with water.
3.1.10
Pipe Hanger and Support Installation
3.1.10.1
Pipe Hangers
Provide eye-bolts or swivel joints for pipe hangers to permit pipe thermal
or mechanical movement without angular misalignment of hanger vibration
isolator.
3.1.10.2
High Temperatures
Where neoprene elements of vibration isolator may be subjected to high pipe
temperatures, above 71 degrees C 160 degrees F, provide metal heat shields
or thermal isolators.
SECTION 15070N
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