Our Products At Work in the Field

Atlas™ HT System: Dent with an Internal Crack

Fairview, KS
October 15, 2017

Project Overview
A temporary repair was needed for a dent with an internal crack on a 30” OD horizontal buried liquid pipeline in Fairview, KS. The dent dimensions were 36.75” long x 27.3” wide x 1.81” deep at the 5:45 position. The internal crack dimensions were 1.8” long x 0.114” or 30 percent deep at the 6:02 position. This repair was at a Class 1 location with a nominal wall thickness of 0.386” and Grade X70 (70,000 SMYS). The ambient temperature at the site was 78° F and the pipe temperature was 90° F.

Repair Solution
The team designed the temporary repair, using the ASME PCC-2 standard as a guideline, that utilized the Atlas High Temperature (HT) wrap system with 24 layers for four linear feet to keep the pipe successfully operating until a steel sleeve was fabricated and installed.

The reinforcement repair was completed in six hours by two Milliken Infrastructure Solutions wrap installers and contractor personnel. The repair area was grit-blasted and wiped clean with acetone, and EPHT filler material was applied to the dent and spiral welds. A PPRHT epoxy coating was used on the entire repair zone, and ILI smart pig markers were installed at both ends of each repair. The 12” wide Atlas HT system was applied using the “layer over layer with offset” method for four linear feet using four layers of the system. Peel ply and constrictor wrap were applied and post-cured with heating blankets. The constrictor wrap was removed after curing was complete and a Shore D hardness test and a tap test were performed. The contractor applied a topcoat with a customer coating. 

Atlas HT_Dent with Internal Crack_Fairview_BeforeAtlas HT_Dent with Internal Crack_Fairview_DentAtlas HT_Dent with Internal Crack_Fairview_EPHT FillerAtlas HT_Dent with Internal Crack_Fairview_After