Our New And Improved MIll Jointing Area
In 2016, Jindal Tubular USA began construction on a new and improved Mill Jointing area. This new MJ location within our pipe mill makes the MJ process more efficient in pipe flow. Mill Jointing consist of four processes; Mill Joint Cutting, Mill Jointing, Mill Joint Inspection and Mill Joint Repair.
Mill Jointer Cutting
This process begins with determining the type of cut to be made:
Cut-Out: this is typical of a pipe with damage to an interior section of a pipe or due to coil defects in the steel.
Cut-Off: this is typical of a pipe with a damaged end.
No-Cut: this is typical where no cut is required but yet there is a need to join two sections of shorter pipe to produce a longer pipe. For example, you join two forty foot (DRL) sections to produce an eighty foot (QRL) pipe.
Butt-Weld: a Butt-Weld is created when the trailing end of one steel coil is welded to the front end of another steel coil as the steel is fed into the forming machine. This process will produce a pipe with the butt-weld somewhere in the interior of the pipe. Depending on the customer requirements that butt-weld section may need to be removed and the remaining sections joined back together.
After a pipe has been cut it needs to be prepared for jointing by beveling the ends of the pipe. The process of beveling the ends creates a top and bottom bevel profile on the pipe segments to be joined together. This squares both ends of the pipe and makes the overall joint straight.
Mill Jointing consists of joining two or more pipe segments together through the use of our automated weld procedures. The minimum length requirement for pipe segments is ten (10’) feet. No more than a total of three segments can be joined together. Only pipes of the same diameter and wall thickness can be joined together to produce pipe up to a maximum of 80’ in length and 60” in diameter while maintaining traceability of heat and pipe segment numbers. Mill Jointed pipe numbers will end with a MJ suffix to signify the pipe is a Mill Joint pipe.
Mill Joint Inspection
All Mill Joint pipe produced is visually inspected and put through all the same rigorous quality and continuity test as other pipe produced. Depending on the application these test may include Hydro Testing, Ultrasonic Testing and Radiography Testing.
Mill Joint Repair
Any Mill Joint pipe failing its quality inspection is sent back to Mill Joint Cutting and Mill Jointer to be reworked.