spreaders.
**************************************************************************
Spreaders shall be provided between adjacent piping runs to prevent contact
during seismic activity whenever pipe or insulated pipe surfaces are less
than [100][_____] mm [4][_____] inches apart. Spreaders shall be applied
at same interval as sway braces at an equal distance between the sway
braces. If rack type hangers are used where the pipes are restrained from
contact by mounting to the rack, spreaders are not required for pipes
mounted in the rack. Spreaders shall be applied to surface of bare pipe
and over insulation on insulated pipes utilizing high-density inserts and
pipe protection shields in accordance with the requirements of Section 15080
THERMAL INSULATION FOR MECHANICAL SYSTEMS.
3.6
SWAY BRACES FOR PIPING
Sway braces shall be provided to prevent movement of the pipes under
seismic loading. Braces shall be provided in both the longitudinal and
transverse directions, relative to the axis of the pipe. The bracing shall
not interfere with thermal expansion requirements for the pipes as
described in other sections of these specifications.
3.6.1
Transverse Sway Bracing
**************************************************************************
NOTE: Piping can be either rigid or flexible.
Rigid piping has a period of vibration of 0.06
seconds or less. Piping systems with spacing
between braces that exceeds allowable spacing for
rigid piping will be deemed flexible and will be
designed accordingly.
The designer should provide requirements for bracing
PVC pipes.
**************************************************************************
Transverse sway bracing for steel and copper pipe shall be provided as
specified in Section 13080 SEISMIC PROTECTION FOR MISCELLANEOUS EQUIPMENT.
All runs (length of pipe between end joints) shall have a minimum of two
transverse braces. Transverse sway bracing for pipes of materials other
than steel and copper shall be provided at intervals not to exceed the
hanger spacing as specified in Section 15400 PLUMBING, GENERAL PURPOSE.
3.6.2
Longitudinal Sway Bracing
**************************************************************************
NOTE: Locate longitudinal sway braces on the
drawings for systems subject to thermal expansion
because indiscriminate placement of sway braces may
interfere with expansion requirements.
**************************************************************************
Longitudinal sway bracing shall be provided at 12 m 40 foot intervals
unless otherwise indicated. All runs (length of pipe between end joints)
shall have one longitudinal brace minimum. Sway braces shall be
constructed in accordance with the drawings. Branch lines, walls, or
floors shall not be used as sway braces.
SECTION 15070A
Page 13
Previous Page
