PEX AL PEX Pipe: The Complete Guide to Multi-Layer Composite Plumbing
Description
Introduction
PEX AL PEX pipe are revolutionizing modern plumbing with their hybrid design. Combining the flexibility of PEX with the rigidity of aluminum, these multi-layer pipes offer superior performance for hot/cold water systems, radiant heating, and industrial applications. This guide explores their composition, advantages, installation techniques, and why they outperform traditional piping materials.
What Is a PEX AL PEX Pipe?
PEX AL PEX pipes are composite tubes consisting of three layers:
Inner PEX Layer: Cross-linked polyethylene for flexibility and chemical resistance.
Middle Aluminum Layer: 0.2–0.5mm thick for oxygen barrier protection and thermal stability.
Outer PEX Layer: Additional PEX coating for durability and UV resistance.
Key Features:
Oxygen Barrier: Prevents corrosion in metal components (e.g., boilers, radiators).
Thermal Expansion: 80% less linear expansion than standard PEX, reducing noise and stress.
Pressure Rating: Up to 20 bar (290 PSI) at 95°C (203°F).
Types of PEX AL PEX Pipes
1. Standard PEX AL PEX
Purpose: Residential plumbing, underfloor heating, and solar water systems.
Colors: Red (hot water), blue (cold water), white (neutral).
Sizes: 16mm to 32mm in diameter.
2. UV-Resistant PEX AL PEX
Purpose: Outdoor installations exposed to sunlight.
Additives: Carbon black or titanium dioxide to block UV rays.
3. High-Pressure PEX AL PEX
Purpose: Industrial applications (e.g., compressed air, chemical transport).
Features: Thicker aluminum layer (0.5mm+) and reinforced PEX layers.
4. Fiber-Reinforced PEX AL PEX
Purpose: Seismic-prone areas requiring enhanced impact resistance.
Structure: Glass or aramid fibers embedded in the outer PEX layer.
Advantages of PEX AL PEX Pipes
1. Oxygen Barrier Protection
The aluminum layer blocks oxygen permeation, preventing rust in boilers, radiators, and other metal components. This extends system lifespan by up to 30%.
2. Reduced Thermal Expansion
Unlike standard PEX, which expands significantly with temperature changes, PEX AL PEX maintains its shape, minimizing noise and joint stress.
3. Corrosion Resistance
Withstands aggressive water conditions (pH 6–9) without scaling or pitting.
Ideal for hard water areas where copper pipes may fail.
4. Energy Efficiency
Smooth interior surfaces reduce friction, lowering pumping energy costs by 15–25%.
High thermal insulation minimizes heat loss in hot water systems.
5. Eco-Friendly
100% recyclable and free from toxic additives like lead or phthalates.
Lower carbon footprint compared to copper production.
How to Install PEX AL PEX Pipes
Step-by-Step Guide
Cutting the Pipe
Use a fine-toothed saw or rotary cutter for clean, square cuts.
Avoid snapping pipes, as this can damage the aluminum layer.
Deburring
Remove burrs with sandpaper or a deburring tool to prevent gasket damage during fitting.
Compression Fittings
Tools Needed: PEX AL PEX compression rings, olives, and wrenches.
Process:
a. Slide the compression ring and olive onto the pipe.
b. Insert the pipe into the fitting socket.
c. Tighten the nut with a wrench (25–30 Nm torque).
Press Fittings
Tools Needed: PEX AL PEX press jaws and hydraulic press tool.
Process:
a. Align the pipe with the fitting.
b. Press the joint using the appropriate jaw size.
c. Check for a visible press mark to confirm security.
Pressure Testing
Fill the system with water and pressurize to 1.5x the operating pressure.
Inspect for leaks over 30 minutes.
Common Mistakes to Avoid
Over-Tightening: Excessive force can crack the aluminum layer.
Under-Tightening: Loose fittings lead to leaks.
Contamination: Dust or moisture inside the pipe causes corrosion.
Applications of PEX AL PEX Pipes
Residential Plumbing: Hot/cold water supply, radiant floor heating.
Commercial Buildings: Hotels, hospitals, and office HVAC systems.
Industrial Uses: Chemical transport, compressed air lines, fire sprinklers.
Renewable Energy: Solar water heater piping for efficient heat transfer.
Agriculture: Irrigation systems requiring durable, oxygen-barrier pipes.
IFAN factory started in 1993. And IFAN has workshop 120000 square meter with 610 staff. IFAN can design and produce all plumbing pipe and fitting include PPR,PVC,CPVC PPSU HDPE PEXA PEXB PERT pipe and fitting ,brass fitting, brass ball valve ,heating system , gas system , sanitary faucets and hose, In the past 30 Years, IFAN has never forgotten his mission-To protect health and safety. And IFAN factory use best materials to produce high quality pipe and fittings with automatic production line and high tech quality control machines. The most important,IFAN can guarantee that all pipes and fittings manufactured by IFAN are qualified. More information pls feel free contact us Whatsapp.
