Slip Lining

Slip Lining is the most established and simplest trenchless technique involving the insertion of a new continuously welded pipe into an existing pipe. Insitu Pipelines makes use of a specialist computer controlled winch to slipline pipes up to 1000mm in diameter, with a maximum single insertion of up to 600m being possible, diameter dependent.

HOW DOES IT WORK?

Step 1

The inner pipe is usually manufactured from High Density Polythylene (HDPE) and has an outside dimension smaller than the inside dimension of the host pipe.

Step 2

The new pipe is either pulled or pushed into the host pipe by a specially designed hydraulic winch.

Step 3

The annular space between the new and existing pipes is usually grouted to seat the new pipe and transfer the load from the existing pipe. Structural grout helps the new and host pipe to act as a composite, increasing the pipe’s ring rigidity, strength and resistance to external hydrostatic loads.

WHEN TO USE IT

The ideal host pipe for slip lining has excess capacity and is straight with no deformities. The pipe must have only modest bends and offset joints, and no severe protrusions into the pipe.  Slip lining may be continuous or segmental.

This technique is limited to circular pipelines. A pit may need to be excavated.  The entrance to the defective pipe needs to have sufficient open space to lay and feed the new pipe.

Disruption to Service

Excavation at the insertion point may be required. The inner pipeline is pre-manufactured to specification and does not affect downtime.

OTHER TRENCHLESS TECHNOLOGIES

CIPP Lining

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Pipe Bursting

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Micro Tunnelling

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