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Hi PipelineEngr, My analysis is run using Irregular Wave (ISSC). My Stress Range should be come from half cycle now. So my implementation should change to the following: SJones, If that so, I guess my previous method is correct. 1. Stress Range = From Analysis Output 2. Duration for every...

SJones, If that so, I guess my previous method is correct. 1. Stress Range = From Analysis Output 2. Duration for every cycle = From Analysis, taken as duration between the extreme stress occurrence. 3. Allowable Fatigue Cycle for Installation = 10% * Fatigue Cycle (from S-N Cycle at analysis...

Hi SJones, I do agreed with you. However I has been witness that in Installation Phase, it is becoming a norm on translating the Allowable Cycle into Allowable Duration which make me wonder if the approach is correct. Hence why I have say didn't have a full grasp on this subject. Further more...

SJones, Thanks for the reference. However I cant related the practicality of the fatigue calculation to the installation. Thus why I write this thread. Could you simplify for me? Now that I already able to calculate the Life Cycle, N. This Life cycle is calculated by the Stress Range which is...

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Hi, I been running analysis for pipelay. Nowdays Fatigue calculation has become a norm in the industry. However I still cant grasp the fundamental. In installation phase, we look into fatigue analysis so we can determine the allowable lay duration for each pipe length or pipe weld. Sometime...