I need to analyze two GRE pipelines. The system is: Underground with several changes in direction, with maximum straight length of pipeline about 400 meters. Short radius elbows since vendor does not have higher radii bends!!! Depth of installation is 2 m to top of pipe. OD=157.8mm, WT=4.06mm, Tdesign=61degC, Fluid=water, Pipe qualified pressure=7.66MPa. Soil is relatively good with 30 deg internal friction angle and 1800 kg/m3 density. Soil type close to sand and I model it using American Lifelines Alliance method sand/gravel type. I use ISO 14692 for the analysis. I have populated all the cells with appropriate data supplied by vendor(see attached model and files). I have also prepared several load cases(see attached). The problem is that I have overstress and need to find a solution how to struggle with it. I cannot use higher radii bends since they are not available. To have code compliance I must shorten the maximum straight runs to less than 10meters!!!(I found it thru iterations). I cant afford this because vendor informed that we cant use more than 50 fittings per pipeline route!!! Any advises would be appreciated!
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