Type "D" Coupling
Triple-Component Clay Pipe Connections
Type "D" couplings provide Greenbook-compliant connections for plain-end clay pipe up to 12-inch (300 mm) maximum diameter, adhering to the Standard Specifications for Public Works Construction (SSPWC). These specialized couplings consist of three critical components: a circular synthetic rubber sleeve, two AISI 316 stainless steel compression bands with integrated stainless steel tightening devices, and an injection-molded ABS shear ring—creating a system engineered specifically for the demands of municipal infrastructure.
Laboratory-verified to deliver exceptional performance, these joints withstand shear loading of 150 pounds-force per inch (26.3 N/mm) of nominal diameter applied over a 120-degree arc without visible leakage under 10 psi hydrostatic pressure. The design allows for a 3-degree deflection in any direction while maintaining complete seal integrity—critical flexibility for accommodating ground movement in underground infrastructure. Each component undergoes rigorous testing to ensure freedom from defects including breaks, flange cracks, gouges, and deformation that would compromise long-term performance.
Features
- Three-Component System: Circular synthetic rubber sleeve, dual stainless steel compression bands, and injection-molded ABS shear ring.
- Premium Materials: AISI 316 stainless steel compression bands with stainless steel nut and bolt tightening devices.
- Precision Manufacturing: Synthetic rubber sleeve molded to form smooth surface free of pits, cracks, air marks, porosity, and air pockets.
- Laboratory Verified: Tested for shear resistance, deflection capability, and hydrostatic pressure performance.
- Flexibility Engineering: Accommodates maximum deflection of 3 degrees in any direction.
- Sealing Integrity: Maintains watertight connections under 10 psi (70 kPa) hydrostatic pressure.
- Size Range: Available for pipe diameters from 6-inch to 12-inch (150 mm to 300 mm).
- Shear Load Resistance: Withstands 150 pounds-force per inch (26.3 N/mm) of nominal diameter.
- Corrosion Protection: AISI 316 and 300 series stainless steel components for underground durability.
Benefits include:
Municipal Compliance: Fully meets Standard Specifications for Public Works Construction (SSPWC/Greenbook) requirements.
Shear Force Protection: Resists ground movement and settling that would compromise conventional connections.
Flexible Performance: Maintains seal integrity during pipe deflection and ground shifting.
Watertight Reliability: Prevents infiltration and exfiltration under pressure testing conditions.
Corrosion Resistance: Premium stainless steel components resist degradation in aggressive soil environments.
Quality Assurance: Rigorous testing protocols ensure consistent performance across installations.
Structural Support: ABS shear ring provides critical reinforcement to maintain joint integrity.
Installation Confidence: Visible verification of proper assembly without specialized tools.
Long-Term Durability: Components designed to withstand underground conditions without failure.
Additional Resources
Sizing Tables
Type "D" Coupling Sizes
