Maximum allowable span lengths for each pipeline in accordance with DNV-RP-F105 considering fatigue damage due to vortex- induced vibration (VIV) Fatigue lives for in-line and cross-ow vibration Propensity of the span to buckle Operating temperature prole for each pipeline A model of a span was created in Abaqus, including pipeline coatings and marine growth. A detailed fatigue assessment was undertaken for a range of span lengths allowing for limitations on the validity or natural frequency and stress amplitude estimation equations in DNV-RP-F105 to be avoided and conservatism to be reduced. The benets We conrmed the maximum allowable span length for each pipeline in the system and recommended that if a span was identied that was Case Study: Assessment of pipeline free spans to DNV-

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