Page 345 - Trenchless Technology Piping Installation and Inspection
P. 345
Monetary Penalties No deduction, assuming adequate thickness is achieved. No deduction, assuming adequate thickness is achieved.
Repair Types Removal of wrinkles (fins) and coat area with approved epoxy material. Trim to within 1/4 in. of pipe wall surface. N/A
Requirements Repair if exceeding 5 percent of nominal diameter of existing pipe along top of the pipe (from 9 to 3 o’clock position) and 3 percent of nominal diameter of existing pipe along bottom of the pipe (from 3 to 9 o’clock position). No action required.
Repair
Accepted Tolerance Generally 5 percent of nominal diameter in top and 3% of nominal diameter in bottom of the existing pipe is tolerated, assuming such does not impede the normal flow characteristics.∗ The wrinkles are relatively minor and should not impede the flow characterist
Probable Cause Undersized or deteriorated localized section of existing pipe. The corrugated pipe may have been measured incorrectly at the inside diameter or high point of the corrugations, rather than the center of the corrugations.
Defects Wrinkles/fins/ folds (LW)/(LF)
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