## Proceedings of the ... International Conference on Offshore Mechanics and Arctic Engineering, Volume 2American Society of Mechanical Engineers, 2001 - Arctic regions |

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Page 113

3 , where the crack length , normalized by pipe thickness , versus life in years , is

plotted for different

of these data sets was made to try to determine an optimum crack growth rate ...

3 , where the crack length , normalized by pipe thickness , versus life in years , is

plotted for different

**initial**crack depths . Crack Growth Rate The comparison of allof these data sets was made to try to determine an optimum crack growth rate ...

Page 114

There is a mixed result between these two solutions with the tension only solution

giving about a 30 percent higher life for

plus bending solution giving a 50 percent higher life at 0 . 05

There is a mixed result between these two solutions with the tension only solution

giving about a 30 percent higher life for

**initial**defect depth of 0 . 1 and the tensionplus bending solution giving a 50 percent higher life at 0 . 05

**initial**defect ...Page 115

Since it is impossible to show that the ID of an SCR is free of a defect , an

pre - existing defect should be assumed and the fatigue life based only on crack

propagation . The two most important variables that emerged from these studies ...

Since it is impossible to show that the ID of an SCR is free of a defect , an

**initial**pre - existing defect should be assumed and the fatigue life based only on crack

propagation . The two most important variables that emerged from these studies ...

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acceptable analysis applied approach assessment associated assumed calculated coefficient combined components considered corresponding corrosion cost crack criteria damage dependent depth determined developed directional distribution dynamic effect element Engineering environmental equation estimate evaluated example expressed extreme factor failure fatigue Figure force frequency function fuzzy given growth important increase initial inspection limit load loss maintenance marine maximum mean measures Mechanics method motion normal observed obtained offshore operations parameters peak performed period pipe pipeline platform possible prediction present probability procedure production random range relative reliability represented response return period riser risk safety ship shown shows significant simulation spectral spectrum statistical storm strength stress structure surface Table theory typical uncertainty variables wave height wind