1. The T-DRILL Power legs center on the main pipe. Pilot hole is drilled. |
2. On the Inside of the main pipe, from the T-DRILLhead special hardened steel formation pins are extended. These cause a back flow of rigid metal at the root radius of the joint. The result is a 5.5% average thickening at the root radius. |
3. As the T-DRILLhead is extracted by power feed, the formation pins extrude an outlet around the pilot hole. Power legs absorb all rotational torque. |
4. Tube End Notcher cuts a coupon and double dimples branch tube to assure free flow and limit depth of insertion into main line providing an inspection aid.
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5. The branch tube is inserted into the outlet and brazed to provide a solid, free-flow joint. Double dimples are in line with the flow of the tube.
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6. The branch outlets are as strong as the tube. One lead-free brazed joint replaces three soldered joints needed for a tee fitting.
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