Abstract
The influence of low temperature during installation of rigid pipelines by the reeling method has been investigated. More specifically the resistance towards ductile tearing has been assessed for pipeline girth welds subjected to large scale simulated reeling at ambient and low temperature.
Test joints with girth welds were fabricated and subjected to simulated reeling (full scale bending rig) at ambient and “Arctic” temperature of +13°C and -17°C, respectively. A double installation cycle was applied and subsequently samples were extracted both from the material ending its deformation cycle in plastic tension or compression.
Small scale, i.e. Single Edge Notch Tension (SENT) fracture mechanical testing was performed at -30°C. Fracture resistance was assessed in terms of load resistance (SENT CTOD-R and J-R) curves.
The main conclusions from the performed study are:
1. The pre-deformation does not significantly modify the ductile tearing resistance.
2. Low pre-deformation temperatures do not lead to any significantly drop of the tearing resistance.
Test joints with girth welds were fabricated and subjected to simulated reeling (full scale bending rig) at ambient and “Arctic” temperature of +13°C and -17°C, respectively. A double installation cycle was applied and subsequently samples were extracted both from the material ending its deformation cycle in plastic tension or compression.
Small scale, i.e. Single Edge Notch Tension (SENT) fracture mechanical testing was performed at -30°C. Fracture resistance was assessed in terms of load resistance (SENT CTOD-R and J-R) curves.
The main conclusions from the performed study are:
1. The pre-deformation does not significantly modify the ductile tearing resistance.
2. Low pre-deformation temperatures do not lead to any significantly drop of the tearing resistance.