Introduction to Outdoor and Underground Use
Brass pipe fittings are commonly used in plumbing systems. They offer strength and durability. However, outdoor and underground environments are harsh. Soil contains moisture, chemicals, and salts. These factors can cause corrosion. Proper selection and protection are essential for success.
General Suitability for Outdoor Use
Brass pipe fittings can be used outdoors successfully. Manufacturers design them for this purpose. One product line is rated for temperatures from -65°F to 250°F. It is explicitly marked for use both indoors and outdoors. The pressure rating reaches 1200 PSI maximum.
Environmental Factors Affecting Brass
Several conditions accelerate corrosion of brass pipe fittings outdoors. Moisture is the primary concern. High humidity and rain expose fittings to water. Chloride ions from salt spray are also harmful. Industrial pollution can create acidic conditions. Each factor increases the corrosion rate.
Soil Moisture and Corrosion Rate
Scientific research shows a specific pattern. As soil moisture increases, corrosion rate rises. This continues up to a critical limit of 30% moisture. Beyond 30%, the corrosion rate decreases. Brass pipe fittings in very wet soil may corrode less. Moderately moist soil is most aggressive.
Chloride Ions in Soil
Chlorides are particularly damaging to brass. Coastal soils contain salt from sea spray. Road salts can contaminate soil near streets. Fertilizers may also introduce chlorides. Brass pipe fittings in these environments corrode faster. Research confirms that chlorides increase the corrosion rate.
Alloy Composition Matters
The specific brass alloy affects corrosion resistance. Some alloys contain arsenic as a stabilizer. Others have iron, nickel, or other elements. Brass pipe fittings with arsenic show better resistance. The chemical composition significantly influences performance. High-quality alloys last longer underground.
Underground Installation Requirements
Brass pipe fittings approved for underground use have special requirements. Manufacturers specify that fittings must be wrapped. Silicone tape provides an impervious barrier. This protects the fitting from soil contaminants. The wrapping must extend past the fitting ends.
Proper Wrapping Technique
Select self-fusing silicone tape of 0.020″ minimum thickness. Wrap the tape tightly around the fitting. Start at least 1 inch onto the pipe. Overlap the tape as you work around. Continue until 1 inch past the fitting on the other side. The tape bonds to itself within minutes.
Protection from Physical Damage
Backfilling requires careful technique. Remove all rocks and sharp debris from the soil. Sharp objects can puncture the silicone tape. They can also damage the fitting directly. Bed the pipe in clean sand before backfilling. This prevents impact and abrasion damage.
Dezincification Risk Underground
Dezincification is a specific brass corrosion type. It selectively removes zinc from the alloy. What remains is weak, porous copper. Brass pipe fittings underground face this risk. Moist soil conditions accelerate the process. Wrapping provides essential protection.
Warranty Requirements for Underground Use
Manufacturers have clear warranty conditions. Failure to wrap brass pipe fittings underground voids the warranty. This applies to all brands of brass push fittings. The 25-year warranty requires proper wrapping. Always follow the manufacturer’s installation instructions.
Summary and Best Practices
Brass pipe fittings can be used outdoors and underground. They are durable and corrosion-resistant. However, soil conditions vary widely. Always wrap fittings for underground installation. Use self-fusing silicone tape of adequate thickness. Bed the pipe in clean sand. Remove sharp rocks from backfill. Following these practices ensures long-term reliability and warranty protection.
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.