The International Society for Trenchless Technology

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... 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, ...
Pipe renovation method that relies on the host pipe to meet the structural integrity requirements of the utility. ...
3. Open Cut
(Glossary)
Underground construction method involving excavation from ground level to the level required for the installation, maintenance or inspection of a pipe, conduit or cable. Upon completion of the work, the ...
4. Pilot Bore
(Glossary)
First, usually steerable, pass of any boring operation which later requires back-reaming or other enlargement. Most commonly applied to guided drilling, directional drilling and 2-pass microtunnelling ...
Pipe renovation methods that do not require the structured-wall (SW) of the host pipe to contribute to the ring stiffness needed to satisfy the integrity of the utility ...
6. Pipe Jacking & Microtunneling
(News/Guidelines)
... at the excavation face is a key feature of microtunneling, distinguishing it from traditional open-shield pipe-jacking.  Microtunneling requires jacking and reception shafts at the opposite ends ...
... HDD is best suited for installing pressure pipes and conduits where precise grades are not required. The main components of HDD are: (1) a directional drill rig sized for the job at hand; (2) drill rods ...
8. CIPP Lining
(News/Guidelines)
... repairs may be required where the existing pipe is substantially deformed or damaged. After lining, the service connections or laterals are reinstated and the pipe is returned to service, usually within ...
9. Pipe Bursting
(News/Guidelines)
... 200 mm to 250 mm or 250 to 300 mm. Pipe splitting uses the same principles as pipe bursting to replace pipes that require cutting such as steel, ductile iron and plastic pipe. A typical pipe splitting ...
10. Close-Fit Slip Lining
(News/Guidelines)
... of the reduced thermoplastic liner is maintained through the application of longitudinal tension on the pipe as it is pulled into the host pipe. Once the thermoplastic liner pipe is in the required position, ...
11. Pipe Splitting
(News/Guidelines)
... 200 mm to 250 mm or 250 to 300 mm. Pipe splitting uses the same principles as pipe bursting to replace pipes that require cutting such as steel, ductile iron and plastic pipe. A typical pipe splitting ...
12. Epoxy & Polyurethane Linings
(News/Guidelines)
... pipes, tunnels and manholes. As with cement mortar liners, epoxy and polyurethane coatings require that the host pipe be thoroughly cleaned of hard deposits, nodules, scale, corrosion and other debris ...
13. Polyurethane Lining
(News/Guidelines)
... pipes, tunnels and manholes. As with cement mortar liners, epoxy and polyurethane coatings require that the host pipe be thoroughly cleaned of hard deposits, nodules, scale, corrosion and other debris ...
14. Pilot Tube
(News/Guidelines)
... pilot tube method subsequently has been modified to allow larger pipes to be installed on a precise line and grade. The most common method of installing larger pipes requires three steps: (1) the installation ...
15. Mole Ploughing
(News/Guidelines)
... the cutter picks and chain/wheel system selected. Narrow trenches require back fill and may require restoration of surface to preconstruction conditions.  ...
16. Flood Grouting
(News/Guidelines)
... localized defects. A chemical mix is used for flood grouting of a large section of sewer mains and laterals. The process of grouting requires that the pipe to be grouted is cleaned. In the case of flood ...
17. Narrow Trench
(News/Guidelines)
... and chain/wheel system selected. Narrow trenches require back fill and may require restoration of surface to preconstruction conditions.  ...
18. Organization
(Uncategorised Content)
... for seeing that the Society is functioning as required by UK law, is meeting the objectives of the Society, and is sound financially. Guarantors meet annually to review the operations and finances of the ...
... requirement. How to submit : Applications must be in English and should be prepared with the below criteria in mind with a maximum of 1000 words supported by suitable illustrations in MS Word or PDF. ...
20. 2011 ISTT No-Dig Award Winners
(Uncategorised Content)
... The system has a 500m range, requires only one access point and can clean upstream and downstream as well as up to valve faces.   _________________________________________________________________________________________ ...
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