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For the so-called close-fit process (lining with precisely fitting pipes),
however, the pipes which are used have a cross section which has been
changed in the manufacturing process (e.g. U-liners) or on the building site
itself (e.g. Swage lining). The outside diameter of these pipes is matched to
the inside diameter of the old pipeline and thus deviates from the standard.
The ends of each renovated section of pipeline can be fused with
FRIALEN
®
REM Relining Slide-over Couplers.
At points where it is scheduled to fuse on a coupler or a saddle the relining
pipe should be sized to the nominal inside diameter during the reshaping by
fitting half shells.
6.2
REM Relining Adapter Couplers
One end of the
REM Relining Adap-
ter Coupler
(Figure 25) is matched to
the dimensions of the pipes used for
this process. The other end corres-
ponds to the standard pipe size. This
allows renovated sections of pipeline
to be connected using fitted pieces of
standard pipe. The fittings are used
like slide-over couplers.
6.3
Fitting and fusion
6.3.1 Relining using HDPE standard pipes
When joining standard pipes the appropriate FRIALEN
®
Safety Fittings are
used. The fitting and fusion is carried out in a similar fashion to that in
item 2. For couplers > d 250 mm preheating in accordance with item 4.8 is
recommended when there are larger annular gaps.
6.3.2 Close-fit relining
After the renovation the HDPE pipes used will often exhibit deviations both in
their diameter and from the ideal round shape in the area of the proposed
joint. Depending on the characteristics of the pipe the joint can be made using
a preheating code, and also in conjunction with a support sleeve or a pipe
expander tool.
Figure 25
FL_2104_8_GB_II_08.p65
25.03.2008, 9:48 Uhr
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