Pioneering Critical Closure Joints: Nova Siria Multigrip Couplers Fortify the New 1200mm SDR17 HDPE Te Maunga Outfall pipeline.

Enhancing Resilience and Future Growth: The Te Maunga WWTP Outfall Pipeline

Tauranga City sets its sights on the future with the introduction of a new outfall pipeline from the Te Maunga Wastewater Treatment Plant. This ambitious project not only strengthens the city's resilience but also paves the way for anticipated growth.

The accomplished team at HEB Construction completed the installation of 1200mm and 710mm diameter SDR17 HDPE outfall pipeline on behalf of the Tauranga City Council.

At various segments, the 1200 OD PE pipe required precise installation between fixed points. Overcoming this hurdle entailed creating a gap to insert sealing gaskets, followed by securing flanges through electrofusion or mechanical couplings to establish 'closure joints.'

A series of challenges emerged.

  1. PIPA Guidelines: A maximum gap of 20 mm between pipe ends is required for electrofusion couplers d400 and over.
  2. Precision Installation Amidst Change: These joints, however, had to contend with the dynamic nature of thermal expansion and contraction, leading to up to 100mm fluctuations throughout the day.
  3. Meticulous Alignment Amidst Flow: Certain connections relied on the closure of existing valves; a task complicated when small quantities of water continued to flow.
  4. Narrow Window of Completion: The final two connections had to be executed within a restricted shutdown timeframe, adding a layer of urgency to the equation.

Enter the Nova Siria MultiGrip Couplers and Flange Adaptors, carefully chosen for their exceptional attributes, which proved instrumental in surmounting the challenges:

  • Adaptable Design for Changing Conditions: The Multigrip fittings exhibit a remarkable range of tolerance in pipe insertion depths, effortlessly accommodating the expansion and contraction of PE pipes, a testament to their flexibility.
  • Unwavering Seal Performance: With a sealing tolerance of 30mm on the pipe's outer diameter, the fittings showcased the ability to counteract pipe ovality and flat spots, ensuring an unyielding seal.
  • Seamless Alignment Flexibility: Boasting a 3° angular deflection for flange adaptors and 6° for couplers, these components effortlessly navigated variances in pipe alignment, safeguarding structural integrity.
  • All-Weather Installation: Equipped to be installed under any weather conditions, these fittings required only basic tools, with the added convenience of accommodating running water during installation.

The installation process ranged from approximately three to six hours for each fitting. Following installation, a comprehensive four-part Denso corrosion protection system was meticulously applied to safeguard these critical connections.

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