Procedure:
Swagelining is a Process to draw 0 Pipe through a reduction die to re-Iine an existing pipe.
 It is undertaken by drawing under tension into the host pipe Q Polyethylene (PE) pipe that is pre-shrunk by means of an ambient or hot application as if enters into host pipe. Once pulled through the host pipe and the tension is released, the "memory" of PE material allows
The pipe to revert in size by increasing in diameter and decreasing in length until it come into contact with the host pipe to form a close fit lining.
| BASIS AND EXCUTION PHASES |
The process consist of:
- to temporarily reduce the PE pipe diameter by some 7 to 15% through a reducing die just before pulling it through into the host pipe by means of;
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- an ambient application for smaller diameter pipes, |
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- a hot application by heating to 80°C the PE pipe, and if required with the additional means of a hydraulic pucher; |
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- to pull the PE pipe into the host pipe by the means of a constant traction, and to maintain the diameter of reduction with an elogation of approximately 4%. |
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- to release the tension to allow the PE pipe to expand and reform to tis initial diamater in less than 24 hours where it will form a tight fitting liner, the PE piep is slightly larger than the bore of the host pipe. |
Water,gaz,and all fluids under pressure.
Gravity sewer pipes and force mains.
Pipe diameters ranging from 75 to 1200mm.
Can be strucrturally self supporting depending on the wall
thickiness.
Insertion lengths can be inexcess of 500m.
A Major reference in Singapore
(under execution).
CCTV inspection is a normally a pre-requisite.
Cleaning is undertaken by a set of bruches comprising of:
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- metal scrapers, |
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- wire brushes, |
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- rubber scrapers. |
Verfication of internal diameter of the pipework and junction points by drawing through a gauging pig for:
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- angular deviation verification, |
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- reduction on section verfication, |
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- rubber scrapers. |
Above ground PE pipe welding is carried out;
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- at the pulling head to the first pipe length, |
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- at all pipes lengths by butt-fused welding. |
Pulling rig:
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- carried out a winch of 6, 10, 20 ton... capacity. |
For pipework to be renovated;
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- tight-fitting PE liner to host pipe, |
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- nominal reduction in existing pipe diameter, |
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- general use of standard PE pipe, |
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- liner can be self-supporting and structural. |
For the execution of the works;
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- execution periods is rapid, |
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- pipe sections are assembled above ground, |
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- minimum dig technology, |
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- traffic disruption is minimal, |
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- nominal road and pavement reinstatement, |
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- PE welding technology and products are used.
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Hot reduction
Ambient reduction
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