How to choose the LPG hose fittings

Suitable Fittings for LPG (Liquefied Petroleum Gas) Piping*
Fittings for LPG pipelines must meet requirements for high sealing performance, corrosion resistance, high-pressure tolerance, and safety. Below are common fitting types and key considerations:

1. Common Types of LPG Pipe Fittings
1. Threaded Fittings  
   - Features: Suitable for small-diameter pipelines (e.g., household LPG cylinders or stoves).  
   - Materials: Brass, stainless steel, or galvanized steel (corrosion-resistant).  
   - Note: Use gas-specific sealants (e.g., PTFE tape) to prevent leaks.  

2. Flanged Fittings  
   - Features: Bolted flange connections for medium/high-pressure industrial systems.  
   - Materials: Carbon steel or stainless steel (with anti-corrosion coatings).  
   - Sealing: Requires LPG-resistant gaskets (e.g., rubber-asbestos or PTFE).  

3. Welded Fittings
   - Features: Permanent sealed joints for high-pressure or fixed pipelines.  
   - Materials: Match the pipe material (e.g., seamless steel or stainless steel).  
   - Note: Must be installed by certified professionals to avoid defects.  

4. Quick-Connect Couplings
   - Features: Enable rapid assembly/disassembly for temporary or maintenance use.  
   - Requirements: Must have self-locking, leak-proof designs and explosion-proof certifications.  

 2. Key Selection Criteria  
1. Material Compatibility
   - Avoid aluminum or plastics (PVC/PE) due to corrosion risks.  
   - Recommended: Stainless steel (304/316), brass, or galvanized steel.  

2. Sealing Design 
   - Seals (O-rings/gaskets) must resist LPG; use fluorocarbon rubber (FKM) or PTFE.  

3. Pressure & Temperature Ratings 
   - LPG systems typically operate at **1.5–2 MPa**; fittings must comply with standards like ISO 9809 or GB/T 14976.  

4. Safety Certifications
   - Ensure compliance with ISO 14245 (gas safety), UL, or CE certifications.  

3. Installation Guidelines
1. Anti-Static Measures: Ground the system to prevent static buildup.  
2. Leak Testing: Use leak detectors or soapy water for joint checks.  
3. Professional Installation: High-pressure or welded joints require certified technicians.  
4. Avoid Mechanical Stress: Ensure fittings are free from vibration or misalignment.  

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4. Relevant Standards 
- International: ISO 9809 (seamless gas cylinders), ASME B16.5 (flanges).  
- China: GB/T 3091 (low-pressure pipelines), GB 15558 (polyethylene gas pipes).  
- Europe: EN 10241 (threaded gas fittings).  

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Summary:

Select metal fittings (threaded, flanged, or welded) based on application (household/industrial), pipe material, and pressure ratings. Always adhere to safety standards and installation protocols. For residential use, brass threaded fittings are recommended, installed by licensed gas technicians.