ASME B31E-2008 pdf download

ASME B31E-2008 pdf download.Standard for the Seismic Design and Retrofit of Above-Ground Piping Systems.
Proposing Revisions. Revisions are made periodically to the Standard to incorporate changes that appear necessary or desirable, as demonstrated by the experience gained from the application of the Standard. Approved revisions will be published periodically. The Committee welcomes proposals for revisions to this Standard. Such proposals should be as specific as possible, citing the paragraph number(s), the proposed wording, and a detailed description of the reasons for the proposal, including any pertinent documentation. Interpretations. Upon request, the B31 Mechanical Design Technical Committee will render an interpretation ofany requirementofthe Standard. Interpretations can onlybe rendered in response to a written request sent to the Secretary of the B31 Standards Committee. The request for interpretation should be clear and unambiguous. It is further recommended that the inquirer submit his/her request in the following format: Subject: Cite the applicable paragraph number(s) and the topic of inquiry. Edition: Cite the applicable edition of the Standard for which the interpretation is being requested. Question: Phrase the question as a request for an interpretation of a specific requirement suitable for general understanding and use, not as a request for an approval of a proprietary design or situation. The inquirer may also include any plans or drawings that are necessary to explain the question; however, they should not contain proprietary names or information. Requests that are not in this format will be rewritten in this format by the Committee prior to being answered, which may inadvertently change the intent of the original request. ASME procedures provide for reconsideration of any interpretation when or if additional information that might affect an interpretation is available. Further, persons aggrieved by an interpretation may appeal to the cognizant ASME Committee or Subcommittee.
1 PURPOSE This Standard establishes a method for the seismic design of above-ground piping systems in the scope of the ASME B31 Code for Pressure Piping. 1.1 Scope This Standard applies to above-ground, metallic pip- ing systems in the scope of the ASME B31 Code for Pressure Piping (B31.1, B31.3, B31.4, B31.5, B31.8, B31.9, B31.11). The requirements described in this Standard are valid when the piping system complies with the materials, design, fabrication, examination, testing, and inspection requirements of the applicable ASME B31 Code section. 1.2 Terms and 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, and 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 for which the piping system is to be designed for to perform a seismic function (position retention, leak tightness, or operability). ductile piping system: in the context of this Standard for seismic qualification, ductile piping system refers to a pipingsystemwhere the piping, fitting,and components are made of material with a minimum elongation at rupture of 15% at the temperature concurrent with the seismic load. free-field seismic input: the ground seismic input 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.
seismic design: the activities necessary to demonstrate that a piping system can perform its intended function (position retention, leak tightness, operability, or a com- bination) 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. 1.3 Required Input (a) The scope and boundaries of piping systems to be seismically designed or retrofitted. (b) The applicable ASME B31 Code section. (c) The classification of piping as critical or noncriti- cal, and the corresponding seismic function (position retention for noncritical systems; degree of leak tight- ness, operability, or both for critical systems).