used. Flexible bell and spigot pipe joints using rubber gaskets may be
used at each branch adjacent to tees and elbows for underground waste
piping inside of building to satisfy these requirements.
3.3.2
Underground Piping
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NOTE: This paragraph may not be required for some
Seismic Design Category structures. The designer
will coordinate the requirements for seismic
isolation of piping with the structural and civil
design drawings to locate flexible connections as
required.
The amount of annular space will depend on the
stiffness of the foundation assembly and of the
surrounding soil, and the distance between the
foundation wall and the point outside the building
where the pipe is considered to be restrained. The
geotechnical engineer will determine the pipe length
necessary to provide fixity. As an approximation, a
value of 76 mm (3 inches) would be necessary for a
pipe penetration in a one-story basement in soft
soil.
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Underground piping and 100 mm 4 inch or larger conduit, except heat
distribution system, shall have flexible couplings installed where the
piping enters the building. The couplings shall accommodate [_____] mm
inches of relative movement between the pipe and the building in any
direction. Additional flexible couplings shall be provided where shown on
the drawings.
3.4
PIPE SLEEVES
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NOTE: The designer will determine the amount of
differential movement of piping at pipe sleeves
passing through non-fire rated walls and partitions
and will indicate on the drawings the amount of
clearance required between the pipe and the sleeve
based on deflection of the pipe between sway braces
on either side of the wall.
The designer should avoid pipe penetrations through
fire rated assemblies.
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Pipe sleeves in interior non-fire rated walls shall be sized as indicated
on the drawings to provide clearances that will permit differential
movement of piping without the piping striking the pipe sleeve. Pipe
sleeves in fire rated walls shall conform to the requirements in Section
07840 FIRESTOPPING.
3.5
SPREADERS
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NOTE: Refer to Chapter 10 of TI 809-04 for guidance
on separation between pipes and requirements for
SECTION 15070A
Page 12
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