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ASME B31.9-2016 pdf download

ASME B31.9-2016 pdf download.Building Services Piping.
B-1 PURPOSE This Appendix establishes an alternate method for the seismic design of aboveground piping systems in the scope of ASME B31.9. B-1.1 Scope This Appendix applies to aboveground, metallic, and nonmetallic piping systems in the scope of the ASME B31 Code for Pressure Piping, B31.9. Except for seismic design, the piping system in the scope of this Appendix shall comply with the materials, design, fabri- cation, examination, testing, and inspection require- ments of ASME B31.9. B-1.2 Definitions active components: components that must perform an active function involving moving parts or controls dur- ingorfollowingthe earthquake(e.g., valves, valveactua- tors, pumps, compressors, fans, that must operate during or following the design earthquake). axial seismic restraint: seismic restraint that acts along the pipe axis. critical piping: piping system that must remain leak tight or operable (see definitions) during or following the earthquake. design earthquake: the level of earthquake that the system mustbe designed fortoperforma seismicfunction(posi- tion retention, leak tightness, or operability). freefield seismic input: the seismic inputwithoutconsider- ation for in-structure amplification at the facility location. in-structure seismic input: the seismic excitation within a building or structure, at the elevation of the piping sys- tem attachments to the building or structure. lateral seismic restraints: seismic restraints that act in a direction perpendicular to the pipe axis. leak tightness: the ability to maintain the pressure bound- ary of a piping system during or following the earthquake. noncritical piping: piping system that meets the require- ments for position retention but may not be operable or leak tight during or following an earthquake. operability: the ability of a piping system to deliver, con- trol (throttle), or shut off flow during or after the design earthquake. 63 position retention: the ability of a piping system not to fall or collapse in case of design earthquake. seismic design: the activities necessary to demonstrate that a piping system can perform its intended function (position retention, leak tightness, or operability) in case of design earthquake. seismic function: a function to be specified by the engi- neering design either as position retention, leak tight- ness, or operability. seismic interactions: spatial or system interactions with other structures, systems, or components that may affect the function of the piping system. seismic response spectra: a plot or table of accelerations, velocities, or displacements versus frequencies or periods. seismic restraint: a device intended to limit seismic move- ment of the piping system. seismic retrofit: the activities involved in evaluating the seismic adequacy ofan existing piping system and iden- tifying the changes or upgrades required for the piping system to perform its seismic function. seismic static coefficient: acceleration or force statically applied to the piping system to simulate the effect of the earthquake. B-1.3 Required Input (a) the scope and boundaries of piping systems to be seismically designed or retrofitted (b) the applicable ASME B31.9 (c) the classification ofpiping as critical or noncritical, and the corresponding seismic function (position reten- tion for noncritical systems; leak tightness or operability for critical systems) (d) the free field seismic input (commonly in the form of accelerations) for the design earthquake (e) the responsibility for developing the in-structure seismic response spectra, where required (f) the operating conditions concurrent with the seis- mic load (g) the responsibility for qualification of the operabil- ity of active components, where required (h) the responsibility for the evaluation of seismic interactions (i) the responsibility for as-built reconciliation of con- struction from the design documents
B-2 MATERIALS B-2.1 Applicability This Appendix applies to metallic or nonmetallic duc- tile piping systems listed in ASME B31.9. B-2.2 Retrofit The seismic retrofit of existing piping systems shall take into account the condition of the system and its restraints. The engineer shall evaluate the condition of the piping system and identify and accountfor construc- tion imperfections and current and anticipated degrada- tion that could prevent the system from performing its seismic function. B-3 DESIGN B-3.1 Seismic Loading The seismic loading to be applied may be in the form of horizontal and vertical seismic static coefficients, or horizontal and vertical seismic response spectra. The seismic inputis to be specified by the engineering design in accordance with the applicable standard (such as ASCE 7) or site-specific seismic loading (para. B-1.3). The seismic loading shall be specified for each of three orthogonal directions (typically, plant east-west, north-south, and vertical). The seismic design should be based on three-directional excitation, east-west plus north-south plus vertical, combined by square-root sum ofthe squares (SRSS), a two-directional design approach based on the envelope of the SRSS of the east-west plus vertical or north-south plus vertical seismic loading. The seismic loading applied to piping systems inside buildings or structures shall account for the in-structure amplification of the free field acceleration by the struc- ture. The in-structure amplification may be determined based on applicable standards (such as the in-structure seismic coefficient in ASCE 7), or by a facility specified dynamic evaluation.

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