Pipeline installation efficiency at the project site can be significantly improved by double jointing double random (40ft) pipe lengths into quad random (80ft) sections, reducing field-welding requirements by 50%. Congested work sites can also benefit from double jointing with reduced on-site labour and equipment requirements.
Double jointing can be completed in our facility 20km north of Fort McMurray, or set up in a location that optimizes pipe delivery and handling logistics. Our main double jointing rack can handle pipe sizes from NPS 20 to NPS 48 and has the production capacity of 100 plus welds heavy wall welds per day.
Double Jointing Process Overview
- On the main rack, double randoms are loaded and then rolled into the first station where the end preps are done.
- The pipe then rolls to the first weld station where the pipes are internally aligned and externally welded by submerged arc.
- Once this process is complete the quad random pipe rolls to the capping station for a final submerged arc pass on the external of the pipe.
- The final station, which is done internally with a submerged arc process, completes the weld process.
- All welds are 100% visually inspected as well as NDE with gamma, x-ray or UT as required by client specifications.
- This DSAW (double submerged arc welding) process produces a high quality weld with lowered cost to the client.