L51843 Alternative Processes for Welding onto In-Service Pipelines

The objective of this program was to evaluate alternatives to commonly used processes and practices for welding onto in-service pipelines for hot tapping and repair. The use of alternative processes and practices has the potential to increase deposition rates and significantly reduce the cost of welding onto in-service pipelines and may expand the range of materials and situations for which welding at full-pressure and full-flow can be applied.