8" Grooved Flexible Coupling – Ductile Iron, UL/FM Approved

🔩 8" Grooved Flexible Coupling – UL/FM Approved for Fire Protection, HVAC & Industrial Piping

This 8-inch Grooved Flexible Coupling is designed to connect large-diameter steel pipes while allowing for controlled flexibility, movement, and vibration absorption. It’s ideal for fire mains, chilled water systems, seismic installations, and industrial piping that require a secure yet dynamic connection.

Made from high-strength ASTM A536 ductile iron and coated in orange enamel or galvanized finish, this coupling includes a Grade E EPDM gasket and is fully UL Listed and FM Approved. Its bolt pad design ensures proper alignment, fast installation, and long-term system protection.

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⚙️ Key Features

• Size: 8" nominal pipe size (NPS)
• Pipe OD Compatibility: 8.625" (Standard 8" Schedule 40 steel pipe)
• Material: Ductile iron housing (ASTM A536)
• Gasket: Grade E EPDM, pre-lubricated
• Finish: Orange enamel or galvanized for corrosion protection
• Design: Flexible – allows for axial movement and angular deflection
• Certifications: UL Listed, FM Approved, ANSI/AWWA C606 compliant

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📐 Specifications

• Working Pressure: Up to 500 PSI (system dependent)
• Temperature Range: -30°F to 230°F (EPDM gasket)
• Angular Deflection: Up to ±1° per joint (varies)
• Installation Torque: Typically 130–150 ft-lbs

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🧱 Why Use a Flexible Coupling?

Flexible couplings are ideal for systems that need movement control or tolerance for pipe deflection:

• Absorbs vibration from pumps, equipment, and flow dynamics
• Handles thermal expansion and contraction in large pipe runs
• Reduces system stress caused by seismic or settling movement
• Speeds up alignment during installation across long sections

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💡 Common Applications

• Fire protection mains and risers
• Chilled and condenser water lines
• Mechanical and industrial process piping
• Seismic bracing and expansion zones

Engineered for movement. Certified for safety. Built for large-scale systems.

❓ Frequently Asked Questions

1) What pipe does this fit?
This coupling fits standard 8" Schedule 40 steel pipe with an OD of 8.625".

2) Is it UL/FM certified?
Yes — this model is UL Listed and FM Approved for use in fire and mechanical systems.

3) What kind of movement does it allow?
It allows for limited axial movement and angular deflection, making it ideal for vibration, expansion, and seismic tolerance.

4) Does it include the gasket and bolts?
Yes — each unit includes the ductile iron housing, pre-lubricated EPDM gasket, and bolts ready for installation.