Pipeline Design, Operational Integrity Assessment, and Support Solutions
Ralf Peek has experience with code development and application for Finite Element Analysis, having developed the NPEX code while at the University of Michigan, and further developed it at Shell as a workhorse for pipeline upheaval and lateral buckling analysis. Using NPEX as a starting point, Peek Solutions can efficiently develop codes for specific applications, such as lateral buckling analysis, buried pipeline subject to ice loading or offset at a fault (with the soil modeled by springs), or calculation of pipe deformation capacity without local buckling.
Experience also includes the development of a material subroutine, VUMAT, for ABAQUS/Explicit to model undrained or drained saturated soil behavior during ice gouging over a buried pipeline.
When Ralf Peek 'retired' from Shell Global Solutions International B.V. in September 2016, Shell very kindly allowed some of his work performed during his time at Shell be the released as "unrestricted". Some of these items are downloadable here. Anyone using any of this material should reference it as a published Shell Global Solutions report. A number of these reports also contain computer programs, both in source code form as well as in Windows executable, as attachments to the document.
Program for smoothing of survey data describing the Out-Of-Straightness (OOS) of a pipeline profile for upheaval buckling assessments. This calculates the best fit structural profile, where a structural profile is any profile that can be achieved by an initially-straight, linearly elastic pipe under downward forces which are limited to the gravity loads on the pipe, and upward forces which can be anything anywhere. (For upheaval buckling assessments SMOOP has been used as a pre-processor, followed by NPEX to perform the upheaval buckling assessment accounting for non-linearity due to the inelastic behavior of the steel, and pipe-soil interaction. This program was developed around the year 2000 when it took hours to run on the PCs of those days, but it is a matter of minutes or even seconds now. Furthermore, the latest version enables a multi-grid approach, that can make the solution process more computationally efficient).
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