2.5
SWAY BRACING MATERIALS
Sway bracing materials (e.g. rods, plates, rope, angles, etc.) shall be as
specified in Section 13080 SEISMIC PROTECTION FOR MISCELLANEOUS EQUIPMENT.
PART 3
EXECUTION
3.1
COUPLING AND BRACING
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NOTE: Unless otherwise determined by the
Contracting Officer, A-E designs must include
complete seismic details showing coupling
requirements. Government designer should furnish
coupling details for Contractor designed systems if
required by the project.
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Coupling installation shall conform to the details shown on the drawings.
Provisions of this paragraph apply to all piping within a 1.5 m 5 foot line
around outside of building unless buried in the ground. Piping grouped for
support on trapeze-type hangers shall be braced at the most frequent
interval as determined by applying the requirements of this sepcification
to each piping run on the common support. Bracing components shall be
sized as required for the total load carried by the common supports.
Bracing rigidly attached to pipe flanges, or similar, shall not be used
where it would interfere with thermal expansion of piping.
3.2
BUILDING DRIFT
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NOTE: Refer to Section 13080 SEISMIC PROTECTION FOR
MISCELLANEOUS EQUIPMENT to determine the expected
drift of the building. Insert the expected drift
ratio (in terms of deflection per unit of height) in
the blank space.
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Joints capable of accommodating seismic displacements shall be provided for
vertical piping between floors of the building, where pipes pass through a
building seismic or expansion joint, or where rigidly supported pipes
connect to equipment with vibration isolators. Horizontal piping across
expansion joints shall accommodate the resultant of the drifts of each
building unit in each orthogonal direction. For threaded piping, swing
joints made of the same piping material shall be provided. For piping with
manufactured ball joints the seismic drift shall be [0.015] [_____] meters
per meter feet per foot of height above the base where the seismic
separation occurs; this drift value shall be used in place of the expansion
given in the manufacturer's selection table.
3.3
FLEXIBLE COUPLINGS OR JOINTS
3.3.1
Building Piping
Flexible couplings or joints in building piping shall be provided at bottom
of all pipe risers for pipe larger than 90 mm 3-1/2 inches in diameter.
Flexible couplings or joints shall be braced laterally without interfering
with the action of the flexible coupling or joint. Cast iron waste and
vent piping need only comply with these provisions when caulked joints are
SECTION 15070A
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