26
Tube Products International May 2013
products & developments
Port Elizabeth goes spiral-wound
SPR Asia Pacific and its Australian
technology company, Sekisui Rib Loc,
provided the trenchless technology
solution for rehabilitating two circular
sewers with diameters of 525mm and
1,050mm beneath the heavily trafficked
Govan Mbeki Avenue and the newly
constructed Bus Rapid Transport lane
located in the heart of Port Elizabeth’s
central business district, South Africa.
The spiral-wound pipe technology
SPR™ EX was used to rehabilitate
600m of the 525mm-diameter sewer
pipe in the business district. SPR RO
relined 720m of the 1,050mm-diameter
sewer under the Bus Rapid Transport
lane. For the Mandela Bay Development
Agency this rehabilitation was part of
a continued pipe rehabilitation and
environmental upgrading project.
After a CCTV and physical inspection
where windows were cut into the
concrete sewer pipes, the need for
rehabilitation was ascertained. The
525mm sewer was severely corroded
around its whole circumference due
to acidic effluent. The measured pH
values were as low as 3.3. This old
sewer had been cast in two sections
with horizontal joints running along its
full length. The mortar had corroded
between the construction joints and the
pipe was no longer watertight.
The 1,050mm sewer was severely
corroded above the water line, and
the steel reinforcing was exposed and
had corroded away in places. The
most severe deterioration occurred
at the sides and invert of the sewer
due to a combination of corrosion and
erosion, and was particularly severe
along those sections of the sewer
where the velocity was high. Due to the
severity of deterioration and the limited
space aboveground, the spiral-wound
technology was the only cost-saving
process allowing a complete no-dig
lining solution through manholes.
During the rehabilitation phase
unforeseen occurrences, such as a
15m-long 90° radius bend in the 525mm
pipe and a 43m long part where the
1,050mm sewer reduced in diameter
to 800mm, required the introduction of
an ambient cure and a UV cured CIPP
method. Additionally, pipe bursting of
16m of a cracked and leaking lateral
clay pipe with a diameter of 225mm
became necessary to prevent plugging
and over-pumping at a critical manhole.
Spiral-wound pipe lining is a patented
method that includes five different
solutions for rehabilitating sewers and
stormwater pipes with diameters from
150 to 5,000mm. Circular and non-
circular pipes can be rehabilitated
using custom shaped profiles for pipe
lengths up to several hundred metres.
The spiral-wound technologies can
structurally rehabilitate brick, concrete,
glass reinforced plastic or corrugated
metal sewer and stormwater pipelines.
The system consists of a single,
manageable continuous PVC or
HDPE profile strip, steel-reinforced
as required, which is spirally wound
into the existing sewer or stormwater
pipeline via a patented winding machine
positioned in the base of an existing
manhole or access chamber. The edges
of the profile strip either interlock as it is
spirally wound into the existing pipeline,
or are welded to form a liner that is
watertight.
With the SPR EX and SPRRO techniques
used in Port Elizabeth, the PVC profile
formed a new spiral-wound liner that
provided a close-fit to the inside of the
rehabilitated pipe. In the case of SPR
EX, the winding machine was lowered
to the base of the access chamber
through a standard manhole. The PVC
profile was fed from an above-ground
spool into the winding machine, which
then spirally wound the liner into the
host pipe.
For the SPR RO implementation, the
winding machine rotated and traversed
inside the deteriorated pipeline,
forming a close-fit watertight liner as it
progressed.
SPR Group
– Germany
Contact Bob Wren & Lisa Stoney
-
-
Primrose Alloys
330 Primrose Road,
Suite 205, Burlingame,
CA 94010, USA
Phone
: + 001.650.558.8776
We stock
seamless stainless
instrumentation tubing
in Houston and Chicago
Custom-manufactured strainer
GL Ludemann Armaturen GmbH has
manufactured a T-type strainer in welded
construction (ANSI, 150lb, 16"). The
strainer, to be installed in a wastewater-
system, was constructed for the
special requirements of a client in the
Netherlands. The company’s standard
products include strainers and filters
in cast iron, graphite iron, cast steel
and stainless steel, of different types
according to EN and ANSI standards, as
well as individual solutions according to
clients’ requirements.
The product range meets the demands
and requirements of industries such
as chemical and petrochemical, heat
and power plant, foodstuffs, marine
applications, oil and gas, paper and
pulp, pharmaceutical, steel, low
temperature applications, drinking and
waste water supply, and environmental
technology.
GL Ludemann Armaturen GmbH
–
Germany
