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  1. IrwanHamid

    Fatigue Calculation for Pipelay

    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...
  2. IrwanHamid

    Fatigue Calculation for Pipelay

    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...
  3. IrwanHamid

    Fatigue Calculation for Pipelay

    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...
  4. IrwanHamid

    Fatigue Calculation for Pipelay

    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...
  5. IrwanHamid

    Fatigue Calculation for Pipelay

    Image in link: https://flic.kr/p/nhyqeShttps://www.flickr.com/photos/30212125@N04/13970881188/
  6. IrwanHamid

    Fatigue Calculation for Pipelay

    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...

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