Fire-Rated galvanized pipe fittings | UL-Listed Safety Standards

Fire-Rated Galvanized Pipe Fittings | UL-Listed Safety Standards

Product Specifications (ASTM A795/A795M-21 & UL 1821CRD-2018 Compliance)

Key Performance Characteristics

1. Tensile Strength & Bend Resistance
   Our fittings achieve a minimum tensile strength of 350 MPa, ensuring structural integrity under high-pressure fire suppression systems. This is critical for applications like fire hydrant networks and sprinkler systems, where sudden pressure surges are common. The elongation rate of ≥10% allows the material to absorb mechanical stresses without fracturing.

2. Corrosion Protection
   Hot-dip galvanizing creates a zinc-iron alloy layer (70+ μm) that resists rust and chemical degradation, even in humid or saline environments. Electro-galvanized options provide a uniform 25+ μm coating for indoor applications.

3. Fire Safety Compliance
   Tested to UL 1424 and Russian standard R 53315-2009, these fittings maintain functionality for 180+ minutes in fire conditions. The zinc coating acts as a thermal barrier, while the malleable iron core prevents warping.

4. Weight Calculation
   Use the formula:

   Weight (kg)=162.8OD2−(OD−2×WT)2×Length (m)

   Example: A 2" (OD 60.3 mm) fitting with 3.9 mm wall thickness weighs approximately 3.2 kg/m.

Why Stainless Steel Resists Rust (and When It Fails)

Stainless steel relies on a chromium oxide layer (passive film) for corrosion resistance. However, rust can occur due to:

• Mechanical Damage: Scratches or abrasions expose the iron substrate to oxygen.
• Chemical Exposure: Chlorides (e.g., seawater) or acids degrade the passive layer.
• Galvanic Corrosion: Contact with dissimilar metals (e.g., carbon steel) accelerates oxidation.
• High Temperatures: Prolonged exposure above 500°C oxidizes chromium, reducing protection.

Our fittings mitigate these risks through:

• Chromium Enrichment (16–20% Cr) for faster oxide layer regeneration.
• Molybdenum Additives to resist pitting in chloride-rich environments.

Applications & Compatibility

• Fire Protection Systems: Compatible with UL-listed sprinklers, FM-approved hydrants, and CPVC pipes.
• Plumbing/Gas Networks: Use pvc to galvanized pipe adapters with dielectric unions to prevent galvanic corrosion.
• Retrofitting: Replacing galvanized pipes? Our fittings reduce labor costs with roll-groove or threaded connections.

Cost Considerations: How Much to Replace Galvanized Pipes?

• Material Costs: $2–$5 per fitting (varies by size and coating).
• Labor Savings: 30–50% faster installation vs. welded carbon steel.
• Lifespan: 50+ years with minimal maintenance, versus 20–30 years for non-galvanized pipes.

Why Choose Our Stainless Steel Solutions?

1. Superior Corrosion Resistance: 316L-grade stainless options available for extreme environments (e.g., coastal areas).
2. Eco-Friendly: 100% recyclable with ISO 14001-certified production.
3. Custom Fabrication: Laser-cut threads and CNC-machined joints ensure leak-proof seals.
4. Global Compliance: Meets ASME B16.3, EN 10242, and NFPA standards for cross-border projects.
5. Lifetime Warranty: Backed by third-party quality audits and traceable material certifications.