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Re: Long pipeline seismic design

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On Jul 17, 2006, at 10:02 AM, joraljim(--nospam--at) wrote:

What is the criteria for the structural design? Who is supposed to give the parameters for structural design, the geologist or the geotechnical engineer? What codes apply here?
Normally you'd do a multi point response spectrum analysis, although you might start with a single point response spectrum that you'd fiddle to provide a rocking effect. ANSYS does this and probably most general purpose FEA codes. I don't think there's a very good manual approach because the actual dynamic response of a long pipeline isn't much like the static response. The best situation is to have site-specific spectra provided by the facility. These would have been developed by geotechnical investigation, but you want spectra which have been properly smoothed and broadened by people familiar with site requirements for safety-related equipment. Ordinarily ASME or API Codes are used, although seismic requirements in either aren't specific enough to provide loading for every site in the world.

Christopher Wright P.E. |"They couldn't hit an elephant at
chrisw(--nospam--at)   | this distance" (last words of Gen.
.......................................| John Sedgwick, Spotsylvania 1864)

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