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Ddj welding
1.
E N E
R G Y & M I N I N G Delta Double Jointing Expert welding capabilities utilizing high-quality processes
2.
Process Step One: Pipe
End Preparation DDJ uses high speed facing machines. These machines are mounted in a fixed position and the pipe is indexed to the machine. Step Two: Pipe Preheat The pipe must be preheated according to project specifications prior to welding. After it is preheated, it is rolled in to the fit-up station. Preheat temperature is verified. Step Three: Pipe Fit-Up The line-up clamp is inserted from the end. Once engaged, the line-up clamp is not released until completion of the first pass of the pipe. The pipes are drawn together and aligned using a hydraulic system. Step Four: Root-Pass Weld After completion of the fit-up, the sub-arc head is lowered on the pipe and welding begins. The pipe rotates while the welding head remains fixed. The welding bead is grinded and a good tie-in is achieved. Step Five: Cap Weld Pipe is then indexed to the second welding station (capping station) where it undergoes a welding process very similar to the first station, without the fit-up. A visual inspection for obvious defects of the cap is made during the second welding process. Step Six: Internal Weld The pipe is then indexed to the next station for ID welding. A submerged arc welding machine, mounted on a lance, controlled by an operator using a camera and remote controls, is inserted to the weld area. After completion of the weld, the flux is cleaned with a metal chipping hammer, swept in a pan, and removed from the pipe. A visual inspection is again performed to identify any obvious defects. Delta Double Jointing Employees of DDJ are all members of both the United States and Canada United Association of Journeymen and Apprentices of the Plumbing and Pipe Fitting Industry or the International Union of Engineers. DDJ1001 11/10 © 2010 Insituform Technologies, Inc. Delta Double Jointing Expert welding capabilities utilizing high-quality processes The Bayou Companies, Inc. 5200 Curtis Lane, New Iberia, LA 70560 www.bayoucompanies.com 337-369-3761 Delta Double Jointing Since 1942, The Bayou Companies has been providing welding services from its New Iberia facility. Recently, Bayou announced its new subsidiary, Delta Double Jointing (DDJ), as a dedicated unit providing expert welding capabilities utilizing high-quality processes. • Portable racks can be set up in pipe staging area or in the coating yard • Facing machines are static and enable higher-quality, straighter fit-ups and double joints • Pipe rotation capability at the facing station enables orientation of the long or spiral seam to any required position • Submerged arc process can be utilized for jointing of pipe • Fully compliant with API Standard 1104 welding requirements • Quality processes result in historical repair rates at less than 1% Technical Specifications Single joint length 15 to 56 feet Double joint length 50 to 85 feet Diameter 16- to 48-inches Wall thickness 0.188- to .999 inches Maximum grade X80
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