An initial series of experiments was conducted in thin wall pipe [(0.125 to 0.188 in. (3.2 to 4.8 mm)] to investigate the effect of pressure and welding direction on the risk of burnthrough. A second series of experiments was conducted to…
The objective of this project was to determine if research in Computational Weld Mechanics had matured to the stage where it could simulate the process of welding on a pressurized pipeline and provide useful estimates of the risk of burn-through. To…
A low-cost system was developed that allows pipeline operators to qualify procedures for welding onto in-service pipelines using pressure and flow. The system can be easily duplicated and is appropriate for use at locations where welding procedures…
Experiments were conducted to evaluate the effect of pressure on burnthrough risk. The results indicate that hoop stress has a significant effect for thin-wall pipe. The experimental data was used to develop and evaluate an alternative burnthrough…
In the present project, a workscope similar to that used in the previous work for PRCI was followed. The initial task consisted of identifying candidate processes and practices for depositing the root pass between a stub-on-type branch connection…
This manual describes the use of the PRCI Thermal Analysis Model for Hot Tap Welding - V4.1, which was developed by Edison Welding Institute (EWI) for PRCI. The model is intended to provide welding engineers with guidance for establishing safe…
This is a final project report which documents the attempts to find a field useable hardness tester that could be used to predict the risk of cracking in the heat affected zone. Only one instrument was identified that performed with reasonable…
Welding onto in-service pipelines and piping systems allows cost-effective installation of branchconnections (hot taps) and repair sleeves. Beyond the normal in-service welding concerns ofburnthrough and hydrogen cracking, there are often additional…
Welds made onto in-service pipelines tend to cool at an accelerated rate as the result of the flowing content"s ability to remove heat from the pipe wall. These welds are therefore likely to have high heat-affected zone (HAZ) hardness values and to…
Welds made onto in-service pipeline are particularly susceptible to hydrogen cracking because of the fast weld cooling rates that tend to result from the ability of the flowing contents to remove heat from the pipe wall. The most commonly used…