The International Society for Trenchless Technology

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1. Alignment
(Glossary)
Planned and actual location in the vertical and horizontal direction of the product from the entry pit to the exit pit. ...
The degree of deflection that the drill pipe and product can safely tolerate without risk of damage to the pipe or product.  ...
3. Auger MTBM
(Glossary)
Microtunnel boring machine (MTBM) that uses auger flights passing through the product pipeline to remove the excavated soil. ...
4. Back Reamer
(Glossary)
Cutting head attached to the leading end of a drill string to enlarge the pilot bore during a pull-back operation to enable the product pipe to be installed. ...
5. Casing
(Glossary)
A pipe to support the bore. Usually not the product pipe. ...
6. Drill Rig
(Glossary)
A trenchless machine that installs pipes and cables by drilling a pilot bore to establish the location of the underground utility before enlarging the hole if needed and pulling back the product. ...
... required for the product pipe. During the pilot bore the direction of the drill string is controlled by the orientation of a slanted face to the drill head, eccentric fluid jets or a combination of these, ...
8. Live Insertion
(Glossary)
Method of installation of a liner while the product pipe remains in service. ...
9. Pilot Tube Method
(Glossary)
A multi stage method of accurately installing a product pipe to line and grade by use of a guided pilot tube followed by up-sizing to install the product pipe ...
10. Pipe Pulling
(Glossary)
Method of replacing small diameter pipes where a new product pipe is attached to the existing pipe which is then pulled out of the ground. ...
11. Product Pipe
(Glossary)
Pipe used for the conveyance of water, gas, sewage, and other products and services. ...
12. Pull-Back
(Glossary)
That part of a guided boring or directional drilling operation in which the drill string is pulled back through the bore to the entry pit or surface rig, usually installing the product pipe at the same ...
13. Reamers
(Glossary)
Downhole tools used to enlarge the bore sufficiently to facilitate installation of the product. ...
14. Sleeve Pipe
(Glossary)
Pipe installed as external protection to a product pipe. ...
15. Swivels
(Glossary)
Devices placed between the reamer and the duct puller or pulling head to eliminate rotation of the product during pullback. ...
16. Pipe Jacking & Microtunneling
(News/Guidelines)
... and aligned in the jacking shaft.  The jacks are then retracted and the slurry lines and control cables are disconnected.  A product pipe or casing is lowered into the shaft and inserted between ...
... linked together to form a drill string for advancing the drill bit and for pulling back reamers and products; (3) a transmitter/receiver for tracking and recording the location of the drill and product; ...
18. Pipe Bursting
(News/Guidelines)
... static or pneumatic bursting head to fragment the existing pipe. Simultaneously, a new product pipe attached to the back of the bursting head is installed in the same alignment as the original pipe.   ...
19. Pipe Splitting
(News/Guidelines)
... static or pneumatic bursting head to fragment the existing pipe. Simultaneously, a new product pipe attached to the back of the bursting head is installed in the same alignment as the original pipe.   ...
20. Pipe Ramming
(News/Guidelines)
... straightforward process. The product or casing pipe, fitted with a cutting shoe and lubricant pipes, is positioned on rails located on a stable platform, which allows the casing to be pushed into soil ...
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