Piping Systems (D7)
This section comprehensively addresses the restraint of Piping systems for
seismic applications. It is extremely practical in nature. It avoids the basic
sizing of components (which is explained in Chapter D4)
and focuses on layout, hardware arrangements, installation options and other
issues critical to the installation contractor. Addressed in the section are
floor mounted, suspended and vertically oriented systems.
This chapter is recommended reading for Installation contractors, design
support for contractors and field inspection personnel.
Pros
and Cons of Struts versus Cables (D7.3)- While Struts and Cables are often used to perform the same restraint function
and because they appear similar to the casual observer, there are significant
differences between them that need to be accounted for in the field. This
section addresses these issues.
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Ceiling
Supported Pipe Restraint Arrangements (D7.4.2)
- Illustrated here are widely ranging options for the installation of both
lateral and axial restraint arrangements acceptable for use on piping systems.
Isolated, non-Isolated, single pipe and multiple trapezed pipes are all
addressed in this section.
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Axial
Restraint of Steam and High Temp Piping (D7.4.5)
- Because of expansion/contraction issues, the axial restraint of steam
and other high temperature piping systems can be extremely difficult. This
section addresses these areas and includes recommendations to resolve these
issues.
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Attachment
Details - Transferring Forces (D7.5.1)
- A key element in the effectiveness of a restraint is the details of the
connection. Basic parameters required to ensure that these connections are
appropriate for seismic applications are included in this paper.
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Attachment
Details - Cable Clamps (D7.5.2)
- There are several end connection details that are suitable for cable restraints.
Both appropriate and inappropriate connections are identified in this section
along with proper installation techniques.
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Attachment
Details - Piping Attachment (D7.5.3)
- The connection between the cable or strut and a piping system can be accomplished
in a wide variety of ways and through the use of a wide variety of hardware.
A wide variety of acceptable arrangements applicable to a broad variety
of possible applications are shown and discussed in this section.
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Attachment
Details - Attachment to Structure (D7.5.4)
- Similar to the connection between the cable or strut and a piping system
is the connection between the cable or strut and the structure. Cautions
are required to ensure that the structure is not weakened by the connection
and that the connection is adequate to transfer the design load. As in the
section above, this segment illustrates a wide variety of acceptable arrangements
that can accomplish this feat.
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Non-Moment
Generating Connections (D7.5.5)
- Under some conditions, restraints can be avoided if the pipe hanger rod
is fitted with a "Non-Moment" generating connection. Additional input on
this subject is available in this section.
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Connection
options for Awkward Situations (D7.6)
- Virtually every application will have situations where the basic connection
arrangements won't fit or simply are not suitable. This section illustrates
several typical "Awkward" situations and offers guidance on possible configurations
to incorporate restraints in these areas.
