PFM 21 6 - Page 6

Keyhole Pipe Surgery Restores
Hospital Drainage System
rainage engineers from Lanes
Group plc have carried out a
programme of no-dig drain repairs at a primary care hospital, restoring the system to good health.
In a process akin to keyhole surgery on
the human body, they inserted 52 ‘patch
liners' in underground pipes at East
Cleveland Primary Care Hospital in
Brotton, North Yorkshire.
The hospital, run by South Tees Hospitals NHS Foundation Trust, provides a
wide range of services, including general rehabilitation and assessment, diagnostics,
administration, and pain control.
Drainage teams based at the Lanes
depot at Stockton-on-Tees carried out
the drain rehabilitation work on behalf of
Team Build Construction without causing disruption to hospital services.
Lanes Area Development Manager
Doug Meynell said: "Rehabilitating
pipes by lining them is the least disruptive way to restore drainage systems
across busy public sites like hospitals,
schools or shopping centres.
"Our pipe lining teams take up very little
space and are very experienced at
working safely and productively in live
environments, so NHS patients and oth-
er visitors would have barely known we
were there."
Lanes had previously carried out a fullsite CCTV drainage survey, providing
details reports backed by HD-quality
video clips, gathered with pushrod and
robotic cameras, which showed the extent of damage to the pipes.
Problems found included circumferential
and longitudinal cracking, displaced
joints and root ingress. A programme of
drain rehabilitation work was approved
by Team Build to resolve the problems.
A series of remote structural repairs,
also known as patch liners, were installed to strengthen the surface water
and foul drainage pipes, and to prevent
water from getting into or leaking out of
the system.
In a repair programme that lasted three
weeks, the Lanes drainage teams used
a process called ambient cure in place
pipe lining (CIPP) to repair each broken
A resin-impregnated glass-fibre sleeve
wrapped around an inflatable rubber
packer was guided into the pipe to the
point where it was damaged.
The packer was then inflated with compressed air, pushing the liner against the
pipe, where it was left to harden - or cure
- a process that usually takes about 90
With the packer removed, the liner
creates a new pipe-within-a-pipe, adding decades to the life of the drain line.
A combination of straight liners and
special curved liners to accommodate
bends in the pipes were installed.
Doug Meynell said: "The only alternative to this no-dig CIPP technique
would have been to carry out 52 excavations and replace each section of
cracked pipe.
"This would have been exorbitantly
expensive and caused major disruption to hospital services. With careful
planning by our teams, and close partnership working with Team Build, all
that was avoided.
"Also, because the patch lining could
be carried out while the hospital's
drainage system was still in use, the
work could be done during daylight
hours, avoiding the need for more
costly night-time work."
Reader Reply No: 216032


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