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As part of an American Petroleum Institute study, experimental efforts were undertaken to assess the effects of wrinkle bends on the fatigue life of pipelines, and three 36-in x 0.281-in pipes were fitted with wrinkle bends having nominal depths of 2%, 4%, and 6% (wrinkle depth percentage calculated by dividing wrinkle depth by the nominal diameter of the pipe). OUR COVER PICTURE shows the pipe sample with 2% wrinkles, and details of this research are included in the paper by Dr Alexander on pages 35-47.
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