28
6.3.3 Pre-heating: Procedure see
item 4.8
6.3.4 Support sleeve
In case of larger deviations in shape
or size on the ends of the pipes in the
area of the joint the use of support
sleeves is recommended (Figure 26).
The fitting can then be used as a
slide-over coupler.
For fitting the support sleeve a suitable
pipe expander tool has to be employed
(Figure 27). Before using the pipe
expander tool deviations in shape
must be taken into account. The
expander shells should be positioned
to give an optimum rounding effect.
The design of the support sleeve is
dependent on the medium flowing,
the material and the pipe size.
The fitting of coupler and sleeve will
be made easier if the pipe tolerances
are taken into account when deciding
on the size.
The use of preheating in
accordance with item 6.3.3 will
then be essential.
6.3.5 Use of a pipe expander tool
as a temporary support
sleeve
If a support sleeve is not wanted the
coupler can be fused using a suitable pipe expander tool, matched to the
size of the pipe. Use of the preheating barcode (see item 6.3.3) is particularly
important to reduce the stresses in the pipe. The tool must remain in place
during the fusion process and until the cooling period has passed.
Figure 26
Figure 27
Pipe expander tool
Figure 28
FL_2104_8_GB_II_08.p65
25.03.2008, 9:48 Uhr
28
Summary of Contents for FRIALEN
Page 31: ...31 ...
