Pipe #5. The fifth pipe tested was a 16" diameter, HDPE specimen. This specimen was fitted with end flanges and pressurized for the test. The test was performed with a 3' cover of soil. The pipe specimen was mounted in the test boxes with the end couplings outside the boxes and shimmed to the ends of the boxes. The move-able test box was pued four feet, forcing the pipe into bending and tension, as in the first three pipe tests.
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