Those efforts were driven in part by two deadly pipeline-seam accidents since 2007, experts say. One raised concerns that existing tests might not be reliable enough to predict pipe-seam failures.

Those efforts were driven in part by two deadly pipeline-seam accidents since 2007, experts say. One raised concerns that existing tests might not be reliable enough to predict pipe-seam failures.

The lip of the braid extends into the seam allowance. The stitching line attaching the braid should be 1/4 inch from the cut edge. Before you get too far sewing on the piping, take a look at the ...

PG&E has identified more than 500 trouble spots on those lines, along sections ranging from a few feet in length to more than a mile, spanning a combined 48 miles. The stretches have pipe-seam ...

To sew piping in a 90-degree corner, lay the piping on the edge of the material as usual. Then snip the tail of the material wrapped around the cording.

Regarding the seam-welded or seamless pipe issue, PG&E notes that the report “does note a discrepancy in PG&E’s records on the type of pipe installed at the San Bruno location.