Cascade Couplings supply non-restrained mechanical pipe connection solutions for joining, repairing, and transitioning between plain-ended pipes.

Core Product Range

• Universal (Wide Range / Smart Fit) Couplings
• Dedicated Couplings
• Long Barrel Couplings
• Step (Stepped) Couplings
• Universal Flange Adaptors
• Steel (Dedicated) Flange Adaptors
• Dismantling Joints

All products are designed to accommodate installation tolerances, pipeline movement, and mixed pipe material systems commonly found in municipal, mining, and industrial environments.

Cascade products are suitable for:

• Municipal water reticulation and bulk supply pipelines
• Sewer and wastewater infrastructure
• Mining process water, return water, and slurry pipelines
• Industrial pipework and plant services

Pipeline rehabilitation, repair, and upgrade projects

Cascade Couplings are suitable for:

• Carbon Steel
• Stainless Steel
• Cast Iron (CI)
• PVC / uPVC
• HDPE / MDPE
• GRP / GRE / FRP
• Concrete
• Asbestos Cement (AC)
• Clay

Wide-tolerance sealing systems allow effective connection across varying pipe outside diameters and mixed-material pipelines.

Nominal Diameter Range

• DN40 (48–58 mm) to DN600 (627–643 mm) — Standard
• DN650 (682 mm) to DN1000 (1020 mm) — Available on request

Pressure Ratings (Size Dependent)

• Working Pressure:
  • PN16 (DN40 – DN400)
  • PN12 (DN450 – DN1000)
• Site Test Pressure:
  • 1.5 × Working Pressure

Final pressure capability depends on product type, size, pipe material, and service conditions.

Cascade couplings consist of:

• A central sleeve
• Two end rings
• Tapered rubber gaskets
• Captivated D-head bolts

When bolts are tightened, the end rings move inward, compressing the gaskets against the pipe OD to create a permanent, flexible, leak-tight seal.

Key Design Features

• Captivated single-spanner D-head bolts
• Wide tolerance sealing capability (up to 34 mm OD variation)
• Angular deflection up to 6° (size dependent)
• Fusion Bonded Epoxy (FBE) coating — minimum 250 micron

Sleeves

• Rolled Carbon Steel
• SANS 1431 Grade 350WA / EN 10025 S355JR

End Rings

• Carbon Steel (SG60 / BS2789)

Bolts & Nuts

• High Tensile Steel Grade 8.8 to SANS 1143
• Optional: Stainless Steel 304 or 316

Rubber Gaskets

• EPDM to ISO 4633 / SABS 974 (standard)

Standard Protection

• Fusion Bonded Epoxy (FBE) coating — minimum 250 micron

Material and coating selection should be based on the conveyed medium, operating conditions, and environmental exposure.

Universal / SmartFit Couplings

Wide-range couplings designed to accommodate multiple pipe outside diameters within a single coupling size.

Dedicated Couplings

Designed for specific pipe ODs where tighter tolerances or higher pressures are required.

Long Barrel Couplings

Used where increased insertion depth is required or to overcome on-site pipe installation variables.

Step (Stepped) Couplings

Used to connect pipes of different outside diameters.

Flange Adaptors

Used to connect a flanged component to a plain-ended pipe.

Dismantling Joints

Allow axial adjustment for installation and removal of valves, pumps, and flanged equipment.

Bolts must be tightened evenly in a diametrically opposed sequence to ensure uniform gasket compression.

Typical Torque Values

• M12: 60 – 100 Nm
• M16: 100 – 130 Nm

Torque values may be reduced for flexible pipe materials such as HDPE and GRP.

• Cascade products are non-restrained unless specifically stated
• Axial thrust forces must be absorbed by suitable external restraint systems or thrust blocks
• Couplings and flange adaptors must remain accessible after installation
• Products must not be encased in concrete
• Installation must follow good engineering practice and applicable standards

Cascade Couplings are manufactured under ISO 9001:2015 certified quality management systems.

Each product is inspected and tested for:

• Dimensional accuracy
• Hydrostatic performance
• Coating adhesion
• Gasket compression integrity

Certificates of Conformance and Material Test Certificates are available upon request.