All-plastic union
All-Plastic Union: The Ultimate Solution for Industrial Piping Systems
All-plastic unions are essential components in modern piping systems, offering superior corrosion resistance, lightweight design, and exceptional durability. These fittings provide leak-proof connections for various industrial applications where metal components would fail due to chemical exposure or environmental factors.
Product Features
- 100% non-metallic construction for complete corrosion resistance
- Lightweight design reduces system weight by up to 60% compared to metal alternatives
- Chemical resistant to most acids, bases, and solvents
- UV stabilized for outdoor applications
- Temperature range: -40°F to 250°F (-40°C to 121°C)
- Pressure rating: Up to 150 PSI at 73°F (23°C)
- Available in sizes from 1/2" to 12"
- Meets ASTM D2467 standards
Technical Specifications
| Size (Inches) | Outside Diameter (mm) | Wall Thickness (mm) | Working Pressure (PSI) | Weight (lbs/ft) |
|---|---|---|---|---|
| 1/2 | 21.3 | 2.77 | 150 | 0.12 |
| 3/4 | 26.7 | 3.03 | 150 | 0.18 |
| 1 | 33.4 | 3.38 | 150 | 0.27 |
| 2 | 60.3 | 3.91 | 140 | 0.76 |
| 4 | 114.3 | 6.02 | 120 | 2.15 |
| 6 | 168.3 | 7.11 | 100 | 4.14 |
Frequently Asked Questions About All-Plastic Union
Q: What materials are used in All-plastic union construction?
A: All-plastic unions are typically made from high-performance thermoplastics such as PVC, CPVC, PP, PVDF, or PTFE. The material selection depends on the specific chemical resistance requirements and temperature range of the application. For example, PVDF offers excellent chemical resistance for harsh environments, while CPVC provides higher temperature tolerance compared to standard PVC.
Q: How do I install an All-plastic union properly?
A: Proper installation involves these key steps: 1) Cut the pipe square and deburr the edges, 2) Clean both pipe ends and the union components, 3) Apply appropriate solvent cement if required (for solvent-weld types), 4) Align the pipes precisely before making the connection, 5) Tighten the union nut hand-tight plus an additional 1-1.5 turns with a strap wrench. Never overtighten as this can damage the plastic threads. Always follow manufacturer's installation guidelines for your specific union type.
Applications
- Chemical processing plants
- Water treatment facilities
- Semiconductor manufacturing
- Food and beverage processing
- Pharmaceutical production
- Swimming pool systems
- Irrigation systems
Advantages Over Metal Unions
| Feature | All-Plastic Union | Metal Union |
|---|---|---|
| Corrosion Resistance | Excellent | Variable (depends on metal type) |
| Weight | Light (60% lighter) | Heavy |
| Chemical Compatibility | Wide range | Limited |
| Thermal Insulation | Good | Poor (conducts heat) |
| Cost | Lower initial cost | Higher initial cost |
| Maintenance | Minimal | Regular required |
More All-Plastic Union FAQs
Q: Can All-plastic unions handle high pressure applications?
A: While All-plastic unions have lower pressure ratings than metal alternatives, modern high-performance plastics can handle pressures up to 150 PSI at room temperature. For higher pressure applications, consider reinforced plastic unions or those with thicker wall designs. The pressure rating decreases with temperature increases, so always consult the manufacturer's pressure-temperature rating charts for your specific application conditions.
Q: How long do All-plastic unions typically last?
A: With proper installation and use within their specified parameters, All-plastic unions can last 20-50 years depending on the material and operating conditions. CPVC and PVDF unions often outlast PVC in harsh environments. Factors affecting lifespan include UV exposure, chemical contact, temperature fluctuations, and mechanical stress. Regular inspections should be performed to check for signs of cracking, deformation, or leaks.
Maintenance Tips
- Inspect unions quarterly for signs of stress or leakage
- Clean with mild detergents only - avoid abrasive cleaners
- Protect from direct UV exposure if not UV-stabilized
- Support piping properly to minimize mechanical stress
- Replace O-rings or gaskets as needed
Ordering Information
| Product Code | Size | Material | Connection Type | Price (USD) |
|---|---|---|---|---|
| APU-PVC-1 | 1" | PVC | Socket Weld | $12.50 |
| APU-CPVC-2 | 2" | CPVC | Threaded | $18.75 |
| APU-PP-3 | 3" | PP | Flanged | $24.90 |
| APU-PVDF-4 | 4" | PVDF | Butt Weld | $32.40 |