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 Pitch
Fibre sewerage pipes were produced and installed in the late 1960's
and early 1970's en mass as a cheap alternative to Vitreous Clay.
Thirty years on they are proving to be a disaster to any property that
is unfortunate enough to have them installed within the drainage
system.
It has been thought that most of the problems associated with
Deformation in Pitch Fibre pipes were caused by ground pressure or
large objects being pressed into the pipe. This has subsequently been
proven to be only part of the problem.
Analysis of defective sections of pipe has shown that the inner sleeve
of the pipe material can become blistered and detached from the
remainder of the pipe drastically reducing the useable internal
capacity of the pipe. Left unchecked, the pipeline can continue to
deteriorate until the internal deformation effectively renders the
pipeline unusable.
Until recently the only effective way to deal with this problem was by
open cut excavation and replacement of the defective sections of pipe,
but advances in “no-dig” technology will now allow the pipeline to be
returned to its original internal diameter, whilst remaining in-situ
obviously negating the need for disruptive excavation works.
Once the pipeline has been returned to its original diameter the
renovation process is completed by the installation of a structural
cured in place pipe liner which allows long term problem free use. |
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