By Agostino Napolitano, Pipeline Department Manager, and Angelina Parlato, Onshore Pipeline Techical Manager, Saipem SpA
Performance limits and potential failures must be identified for buried pipe design. Chief among those are excessive deformations of the pipe, wall buckling and collapse.
Figure 1: Pipe stiffness vs. D/t, assuming E = 2.1E+8 kPa
Maximum allowable pipe deflection is usually not determined by structural failure but by conditions such as clearance for pipe-cleaning equipment, special sections and pipe appurtenances (attachments). Pipeline designers classify pipes as “flexible” or “rig
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