Overview
The Proco 240-AV NN 8X6 is a molded single-sphere neoprene expansion joint engineered for demanding piping system applications. The 8″ nominal ID x 6″ OAL design features a 13.5″ flange OD with 8 bolt holes and 0.75″ recommended bolt diameter. This NN (neoprene tube/neoprene cover with blue stripe) joint meets Coast Guard requirements and conforms to ASTM F1123-87. The unit is offered here in used condition, fully functional and ready for immediate deployment.
Key Features
- Molded Spherical Design: Inherently stronger than conventional hand-built spool arch types
- Multi-Directional Movement: Allows axial compression or extension, lateral deflection, and angular movement
- Floating Flanges: Floating metallic flanges freely rotate on the bellows, compensating for mating flange misalignment and speeding up installation
- Vibration & Noise Dampening: Effectively dampens and insulates downstream piping against transmission of noise and vibration from mechanical equipment
- Industrial-Grade Construction: Nylon tire cord reinforcement with plated carbon steel flanges for corrosion protection
Technical Specifications
The Proco 240-AV NN 8X6 delivers reliable performance across a wide operating range. Key specifications include:
- Nominal Size: 8″ ID
- Face-to-Face Length: 6″
- Working Pressure: 225 psig
- Maximum Vacuum: 26″ Hg
- Axial Extension: ½”
- Axial Compression: ¾”
- Lateral Deflection: ±½”
- Angular Deflection: 7 degrees
- Temperature Range: 20 to 250°F
- Elastomer Material: Neoprene (NN designation)
- Flange Rating: ANSI 150 lb
- Flange OD: 13.5″
- Bolt Circle Diameter: 11.75″
- Number of Bolt Holes: 8
- Bolt Hole Diameter: 7/8″
Typical Applications
Proco Series 240 non-metallic expansion joints are designed for tough demanding industrial applications found in: air conditioning, heating, and ventilating systems; chemical, petrochemical, and industrial process piping systems; power generating systems; marine services; pulp and paper systems; and water, wastewater, sewage, and pollution control systems.
The 240-AV NN is ideal for absorbing thermal pipe movements, isolating vibration from rotating equipment, and compensating for misalignment in piping systems with moderate pressure and temperature requirements.
Compatibility & Replacements
Compatible With
- ANSI 125/150 lb class piping systems and flanges
- Industrial thermal piping systems requiring neoprene elastomer compatibility
- Systems requiring Coast Guard certification (ASTM F1123-87 compliant)
- Piping operating between 20°F and 250°F
- Moderate pressure applications up to 225 psig
Replaces / Drop-In Replacement For
- Other Proco 240-AV NN 8X6 units (same model cross-reference)
- Similar molded single-sphere expansion joints in 8″ flanged configuration
- Hand-built spool-type arch expansion joints where higher strength and lower deflection forces are desired
Works With
- Bolt assemblies: 7/8″ bolt diameter (0.75″ recommended nominal)
- Carbon steel and stainless steel piping systems
- Standard ANSI flange bolt hole patterns (8 holes per flange)
- No gaskets required when mating against flat-face flanges
- Field control units and mechanical anchor systems for vibration isolation
