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PRCI PR-185-0002
- Alternate Processes for Welding onto In-Service Pipelines
- Report / Survey by Pipeline Research Council International, 09/07/2003
- Publisher: PRCI
$198.00$395.00
L51843e
Edison Welding Institute
Need: The most commonly used processes for in-service welding, or welding onto in-service pipelines, are shielded-metal arc welding (SMAW) using conventional low-hydrogen electrodes (EXX18-type) and, to a lesser extent, gas metal arc welding (GMAW). The use of SMAW results in limited productivity and the use of GMAW is limited in the amount of heat input that can be achieved, and can be susceptible to producing lack-of-fusion discontinuities. The use of variations to these commonly used practices, or the use of a totally different process, may have advantages for some in-service welding applications.
Benefit: 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.
Result: The results of this program will allow the economic and environmental benefits associated with in-service welding to be realized. The use of these alternative processes has the potential to significantly reduce the cost of welding onto in-service pipelines.
Edison Welding Institute
Need: The most commonly used processes for in-service welding, or welding onto in-service pipelines, are shielded-metal arc welding (SMAW) using conventional low-hydrogen electrodes (EXX18-type) and, to a lesser extent, gas metal arc welding (GMAW). The use of SMAW results in limited productivity and the use of GMAW is limited in the amount of heat input that can be achieved, and can be susceptible to producing lack-of-fusion discontinuities. The use of variations to these commonly used practices, or the use of a totally different process, may have advantages for some in-service welding applications.
Benefit: 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.
Result: The results of this program will allow the economic and environmental benefits associated with in-service welding to be realized. The use of these alternative processes has the potential to significantly reduce the cost of welding onto in-service pipelines.
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