TPI May 2013

products & developments Port Elizabeth goes spiral-wound

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.

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-

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

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SPR Group – Germany info@sekisuispr.com www.sekisuispr.com

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 www.ludemann.info

Contact Bob Wren & Lisa Stoney - bwren@primrosealloys.com - lstoney@primrosealloys.com Primrose Alloys 330 Primrose Road, Suite 205, Burlingame, CA 94010, USA Phone : + 001.650.558.8776

www.primrosealloys.com

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Tube Products International May 2013

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