Thanks Richard;
I provided dogleg configuration at both ends of the pipeline in order to absorb thermal growth. Doglegs are "S" shaped piping system with 40*OD field cold bends, but eventhough the force are not bellow 40 tones. Without these doglegs, the anchor forces are around 70 tones. So I confirm to you that my pipeline is not running straightly.
I don't know how to attach a PDF file into this forum, otherwise I'll send you a picture.
I think that there is problem with my Stress Analysis Model. My present thread is in strong relation with the other thread that I posted in this forum (see Post Yield Stiffness). Without setting K2=0, even my stress checking failled (overstress) and the anchor load are more huge than 40 tones.
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rem