[3.1.11
High Pressure Ductwork Hanger and Support Installation
Provide ductwork with vibration isolation hangers and supports where
required or indicated. Connect ductwork to equipment with flexible duct
connectors. Segment ductwork with flexible duct connectors.
3.1.11.1
Duct Risers
Provide duct riser supports within shafts with suitable 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.
3.1.11.2
Supports at Base of Duct Risers
For duct isolation supports at the base of risers, provide 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 duct 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 ducts, provide a maximum
deflection of 6 mm 1/4 inch at the midspan of this steel under the
supported load. Rigidly support duct from the supplementary steel and the
supplementary steel isolators.
3.1.11.3
Duct Anchors
Attach each end of the duct anchor to an omni-directional isolator which in
turn shall be rigidly fastened to the steel framing or structural concrete
as indicated. Vertical restraints shall be provided by similar material
arranged to prevent vertical travel in either direction. The load on the
isolation material shall not exceed 3447 kPa 500 psi.
]3.1.12
Equipment Room Sound Isolation
Do not allow direct contact between pipe or ducts and walls, floor slabs,
roofs, ceilings or partitions of equipment rooms.
3.1.12.1
Pipe Penetrations
Provide galvanized Schedule 40 pipe sleeves and tightly pack annular space
between sleeves and pipe with insulation having a flame spread rating not
more than 25 and a smoke developed rating not more than 50 when tested in
accordance with ASTM E 84, maximum effective temperature 538 degrees C 1000
degrees F, bulk density 96 kg/cu. meter 6 pounds/cu. ft. minimum. Provide
uninsulated pipe with a 25 mm one inch thick mineral fiber sleeve the full
length of the penetration and seal each end with an [interior] [or]
[exterior and weather resistant] non-hardening compound. Provide sealant
and mineral-fiber sleeve of a flame spread rating not more than 25 and a
smoke developed rating not more than 50 when tested in accordance with ASTM
E 84.
3.1.12.2
Duct Penetrations
Pack openings around ducts with mineral fiber insulation the full length of
the penetration having a flame spread rating not more than 25 and a smoke
developed rating not more than 50 when tested in accordance with ASTM E 84.
At each end of duct opening provide sealing collars and seal with an
SECTION 15070N
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