Polygon based scheme of the 3D pipeline axis
Ple4Win is based on a 3D geometric model, in which the pipeline is schemed by means of a string of straight pipe, curved bend and T-connection elements. Branches and loops are allowed and as a result stations may be analysed as well. Pipe diameter, pipe wall thickness and the properties of the pipeline materials may change along the pipeline axis.
The program in fact is a finite element program built from straight pipe elements and bend elements. The bend elements have a more complex mechanical behaviour than the pipe elements. Per polygon line the intended length of the pipe elements is provided as well as the length of the bend elements. As bending moments often are concentrated at bends and the bending stiffness of bend elements is reduced due to ovalisation from the bending moment, the bend element length in general is shorter than the adjacent pipe elements. It is, however, possible to extend the shorter bend elements over a short distance at both sides of the bend by means of so called 'extension elements'. Bend behaviour is based on theory of Rodabaugh and George as originally published in 1957, and as such a higher order approximation than contained in the ANSI B31 Codes and NEN 3650/51-series, but quite similar to the ASME B&PV Code, Section III Division 1, subsection NB.
PipelineConfig, last changed: 11/4/2020