Process Double Jointing

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