Pipe Repair products offer a fast, safe way to seal splits, holes, and corroded sections instantly – often under full system pressure – avoiding the need for expensive and time-consuming network shutdowns.
The Viking Johnson Large Diameter range delivers a robust, reliable, and proven pipeline solution specifically engineered for new-lay pipe installations.
This comprehensive portfolio includes Large Diameter couplings, stepped couplings, and flange adaptors built to perform under demanding operational conditions.
This specialised infrastructure range serves major global networks where precise pipe materials and nominal dimensions are specified during the initial design phase.
By combining standard off-the-shelf sizes with bespoke, custom-engineered manufacturing options, Viking Johnson delivers unparalleled flexibility to meet exact diameter tolerances and high-pressure ratings.
This advanced engineering versatility positions the product line as the definitive industry specification for large-scale municipal water and critical industrial pipeline infrastructure.
Metal components are coated with Rilsan Nylon 11, which is WRAS approved for use with potable water, and offers long term corrosion protection and resistance to impact damage. The nuts & bolts are Sheraplex coated to WIS 4-52-03, which does not gall when re-used and offers a consistent “torque / load” ratio reducing the sensitivity during installation while providing long term corrosion protection.
Cold Expansion
Manufactured to AWWA C219, the end rings and centre sleeves are cold-expanded to work-harden the steel. This process ensures precise roundness and verifies structural integrity by subjecting the material to loads substantially greater than those encountered in standard service.
Advanced Welding
Flash butt welding is utilised for both the end rings and centre sleeves to ensure a full-penetration weld. This creates a totally homogeneous material structure free from impurities, guaranteeing uniform strength and long-term reliability across the entire assembly.
Captive Bolts
To streamline on-site assembly, the design features captive, non-rotating bolt heads. This allows for a much faster installation process, as the components can be securely tightened using only a single spanner, reducing labour time and complexity.
Versatile Sleeves
The range is engineered to adapt to diverse site conditions by offering both standard and long sleeve lengths.
Internal Barrelling
The internal barrelling of the sleeve is a key design feature that allows for angular deflection of up to 6°, depending on the size.
Gaskets Options
EPDM (water quality approved) and Nitrile gaskets are provided as standard to suit most applications. For specialist projects, alternative exotic gasket grades are also available to ensure compatibility with aggressive chemicals or extreme environmental conditions.
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Corrosion Protection
Metal components are coated with Rilsan Nylon 11, which is WRAS approved for use with potable water, and offers long term corrosion protection and resistance to impact damage. The nuts & bolts are Sheraplex coated to WIS 4-52-03, which does not gall when re-used and offers a consistent “torque / load” ratio reducing the sensitivity during installation while providing long term corrosion protection.
Cold Expansion
Manufactured to AWWA C219, the end rings and centre sleeves are cold-expanded to work-harden the steel. This process ensures precise roundness and verifies structural integrity by subjecting the material to loads substantially greater than those encountered in standard service.
Advanced Welding
Flash butt welding is utilised for both the end rings and centre sleeves to ensure a full-penetration weld. This creates a totally homogeneous material structure free from impurities, guaranteeing uniform strength and long-term reliability across the entire assembly.
Flange Drilling
Flange drilling to any standard to accommodate site requirements.
Versatile Sleeves
The range is engineered to adapt to diverse site conditions by offering both standard and long sleeve lengths.
End Load Forces
Notching of end ring permits the use of tie roads to harness the flange adaptor to accommodate end loads forces.
Clear & Full Bore Range
As standard flange adaptors are supplied with clear bore to slide over pipe for easy installation on site. Full “S Bore” flange also available for use with wafer style (butterfly) valves.
Gaskets Options
EPDM (water quality approved) and Nitrile gaskets are provided as standard to suit most applications. For specialist projects, alternative exotic gasket grades are also available to ensure compatibility with aggressive chemicals or extreme environmental conditions.
3D Model Loading…
Explore
Corrosion Protection
Metal components are coated with Rilsan Nylon 11, which is WRAS approved for use with potable water, and offers long term corrosion protection and resistance to impact damage. The nuts & bolts are Sheraplex coated to WIS 4-52-03, which does not gall when re-used and offers a consistent “torque / load” ratio reducing the sensitivity during installation while providing long term corrosion protection.
Cold Expansion
Manufactured to AWWA C219, the end rings and centre sleeves are cold-expanded to work-harden the steel. This process ensures precise roundness and verifies structural integrity by subjecting the material to loads substantially greater than those encountered in standard service.
Advanced Welding
Flash butt welding is utilised for both the end rings and centre sleeves to ensure a full-penetration weld. This creates a totally homogeneous material structure free from impurities, guaranteeing uniform strength and long-term reliability across the entire assembly.
Captive Bolts
To streamline on-site assembly, the design features captive, non-rotating bolt heads. This allows for a much faster installation process, as the components can be securely tightened using only a single spanner, reducing labour time and complexity.
Versatile Sleeves
The range is engineered to adapt to diverse site conditions by offering both standard and long sleeve lengths.
Internal Barrelling
The internal barrelling of the sleeve is a key design feature that allows for angular deflection of up to 6°, depending on the size.
Gaskets Options
EPDM (water quality approved) and Nitrile gaskets are provided as standard to suit most applications. For specialist projects, alternative exotic gasket grades are also available to ensure compatibility with aggressive chemicals or extreme environmental conditions.
3D Model Loading…
Explore
Projects
Proven Performance in Global Asset Protection
Viking Johnson Large Diameter couplings and adaptors are successfully deployed across countless international projects, reinforcing critical water supply infrastructure and significantly reducing network water loss. Explore our project portfolio below.
During the summer of 2011, an area of Liverpool experienced catastrophic flooding when a water mains pipe burst, sending huge plumes of water into the air.
Project:
Large Diameter Stepped Coupling – Mining – Chile
Viking Johnson 30″ Large Diameter Dedicated Stepped Couplings joined the water-feed pipe network expanding Codelco’s Andina copper mine in the Chilean Andes.
