SMALL DAMS PETITS BARRAGES

Pipe
Rehabilitation
SLIPLINING
MODIFIED
SLIPLINING
SPRAY
LINING
CURED-IN-
PLACE
LINING
Table 7.2 – Trenchless Technologies (USACE 2001)
Reference Guide for Trenchless Technology
Conditions Pros Cons Comments
1. Unblocked and have some
structural capacity.
2. Any pipe diameter and
circular shape.
1. Unblocked and having
sufficient structural capacity
to aid the new lining.
2. Up to 1 600 mm (63 in.)
dia for PE pipe and up to
330 mm (13 in.) dia for PVC
pipe.
1. Unblocked, very clean,
and structurally sound/
2. Almost any diameter, and
most commonly circular
shape, with rare exceptions.
1. Unblocked, dry pipe walls,
some structural capacity to
aid new lining.
2. Almost any diameter, yet
larger diameters become less
cost effective, can
accommodate non-circular
1. Simplicity of the technique
(insertion of one pipe in
another)
2. It can be accomplished
on-line without diverting
existing pipeline flow.
1. It is a close-fitting pipe
liner that helps to minimize
existing pipe diameter
reduction.
2. Annulus grouting is
eliminated between the liner
and existing pipeline.
1. It inexpensively provides
corrosion protection for iron
pipes.
2. Decreases pipe wall
roughness in deteriorated
iron and concrete pipe.
1. It provides renovation of
existing pipelines with
minimal diameter reduction.
2. Pipeline hydraulic capacity
is most likely increased.
3. Renovation timing can be
1. Reduction in existing
pipeline diameter.
2. The need for insertion and
receiving excavations.
3. Normally, annulus grouting
is needed between the
sliplining and the existing
pipeline.
1. It does not hold up against
high external loads from
structurally unsound pipe.
2. The expanded spiral
wound method allows an
influx of water between the
new sliplining walls and the
existing pipe walls.
1. It is only useful for iron
and concrete pipelines.
2. It is only useful for
corrosion protection,
providing little structural
enhancement.
1. The existing pipeline will
need to be blocked during the
renovation.
2. Traffic management will
likely be required because of
on-site support vehicles.
This technique is useful for
renovating pipeline with
deteriorated interior walls which
have reduced flow capacity.
This method is also useful for
renovating structurally unsound
pipelines.
This technique is useful for
renovating deteriorated pipeline
that has remaining structural
capacity. It is also
recommended where manholes
exist, so that insertion and
pulling excavations may be
eliminated.
This technique is useful for
corroded iron pipe interiors and
deteriorated concrete pipe
interiors. It is recommended
mostly for iron pipes because
of corrosion reduction.
This method is useful in
reducing excavations, if not
eliminating them. This method
is most useful for existing
pipeline with remaining
structural capacity, yet
deteriorated interior pipe wall.
131