3.1.10.3
Valves
Provide vibration isolation hangers and supports at modulating, pressure
reducing, or control valves which will induce fluid pulsations. When
required or indicated, isolate valves with flexible connectors.
3.1.10.4
Machinery Without Flexible Connections
When piping is not connected to vibrating machinery with flexible
connectors, provide the first four hangers with isolation elements designed
for deflections equal to equipment vibration isolator deflections
(including static, operating, and start-up).
3.1.10.5
300 MillimetersTwelve Inch and Larger Pipe
Suspend 300 mm 12 inch and larger pipe vibration hangers from resilient
hanger rod isolators. Resilient hanger rod isolators shall be capable of
supporting pipe during installation at a fixed elevation regardless of load
changes. Provide an adjustable preloading device to transfer the load to
isolation element after operational load is applied. Provide 300 mm 12 inch
and larger pipe supports with unrestrained stable springs for 25 mm one
inch deflection and with built-in leveling device and resilient vertical
limit stops to prevent spring elongation when partial load is removed.
Provide isolators capable of providing rigid anchoring during erection of
piping so that it can be erected at a fixed elevation.
3.1.10.6
Pipe Risers
Provide pipe riser supports with bearing plates and two layers of 6 mm 1/4
inch thick ribbed or waffled neoprene pad loaded to not more than 345 kPa
50 psi. Separate isolation pads with 6 mm 1/4 inch steel plate. Weld pipe
riser clamps at anchor points to the pipe and to pairs of vertical
acoustical pipe anchor mountings which shall be rigidly fastened to the
steel framing.
3.1.10.7
Supports at Base of Pipe Risers
Piping isolation supports at the base of risers shall be two layers of 13 mm
1/2 inch thick heavy-duty neoprene pad separated by 6 mm 1/4 inch thick
steel plate. Use bearing plates sized to provide a pad loading of not more
than 3447 kPa 500 psi. Weld the stanchion between the pipe and isolation
support to the pipe and weld or bolt to the isolation support. Bolt
isolation support to the floor slab with resilient sleeves and washers.
Where supplementary steel is required to support piping, provide a maximum
deflection of 2 mm 0.08 inches at the mid-span of this steel under the
load. Rigidly support piping from the supplementary steel with the
supplementary steel isolated from the building structure with isolators.
3.1.10.8
Pipe Anchors
Attach each end of the pipe anchor to an omni-directional pipe isolator
which in turn shall be rigidly fastened to the steel framing or structural
concrete. Provide a telescoping pipe isolator of two sizes of steel tubing
separated by a minimum 13 mm 1/2 inch thick pad of heavy-duty neoprene or
heavy-duty neoprene and canvas. Provide vertical restraints by similar
material to prevent vertical travel in either direction. The load on the
isolation material shall not exceed 3447 kPa 500 psi.
SECTION 15070N
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