Reliability-based design rules have been developed for the key ultimate limit states applicable to onshore pipeline, including burst under operating pressure and failure due to equipment impact. The design rules are characterized by three elements; the formulas used to calculate the characteristic demand and capacity; the criteria used to define the characteristic values of the key input parameters to these formulas (such as diameter, material strength, pressure and impact load); and the safety factors defining the required excess capacity over the demand.

The overall methodology used in developing the design rules and the practical implications of applying them are described in a companion paper. This paper describes the process used to calibrate safety factors and characteristic input parameter values that meet the desired reliability levels. The final design rules are described in the paper and an assessment of their accuracy and consistency in meeting the reliability targets is included.

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