Abstract
The reliability-based strength design of pipelines is discussed in this chapter. The wall thickness is determined from the loads that the pipeline must sustain in both installation and operating conditions. The uncertainties exist in the design parameters for the wall thickness, which should be considered. The reliability of the pipeline should be subjectively evaluated to save the costs without unnecessary conservatism. In principle, reliability-based design of subsea pipelines involves the following aspects: identification of failure modes for specified design cases; definition of design formats and Limit State Functions (LSF); uncertainty measurements of all random variables; calculation of failure probability; determination of target reliability levels; calibration of safety factors for design; evaluation of design results. At the end of this chapter, a method to calculate the reliability of a corroded pipeline for different design and operating parameters is given. Examples are included to illustrate the effect of different parameters on the reliability.
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