Durable Flange Pipe Fittings ASME SA312 and En10216-5 a/SA106 Gr. B, P195gh, P235gh, P265gh, St35.8,

Product Description

A pipe flange is a disc-shaped piping component used to connect pipes, valves, pumps, and other equipment in a piping system.

Pipe flanges are indispensable in modern piping systems, offering versatility across industries.  Proper selection based on pressure, temperature, material, and application ensures long-term reliability.  Advances in gasket technology (e.g., spiral wound, RTJ) and smart flange monitoring systems continue to enhance performance in critical services.

1. Types of Flanges

1.1 By Connection Design

• Weld Neck Flange (WN) - High-strength, butt-welded for critical applications

• Slip-On Flange (SO) - Easy installation, fillet-welded for moderate pressure

• Socket Weld Flange (SW) - Compact, for small-bore high-pressure piping

• Lap Joint Flange (LJ) - Used with stub ends for easy alignment

• Threaded Flange - Screwed onto pipes without welding

• Blind Flange - Closes pipe ends for pressure testing or future expansion

1.2 By Facing Type

• Flat Face (FF) - For low-pressure applications

• Raised Face (RF) - Most common, improves gasket compression

• Ring-Type Joint (RTJ) - Metal-to-metal seal for high-pressure/temperature

• Tongue & Groove (T&G) - Precision alignment in critical systems

1.3 Specialized Flanges

• Orifice Flanges - For flow measurement

• Expander/Reducer Flanges - Adjust pipe diameter

• Spectacle Blind Flanges - Isolate sections for maintenance

2. Common Materials

• Carbon Steel (ASTM A105) - General industrial use

• Stainless Steel (ASTM A182 F304/316) - Corrosion resistance

• Alloy Steel (ASTM A182 F11/F22) - High-temperature service

• Duplex Steel (UNS S31803/S32205) - Chloride environments

• Nickel Alloys (Inconel, Monel, Hastelloy) - Extreme corrosion/heat

• PVC/FRP - Chemical processing at lower pressures

3. Key Applications

3.1 Oil & Gas Industry

• Pipeline connections

• Wellhead assemblies

• Refinery process piping

3.2 Chemical & Petrochemical Plants

• Reactor/vessel connections

• Acid/alkali transport systems

3.3 Power Generation

• Steam turbine connections

• Boiler feedwater systems

3.4 Water & Wastewater Treatment

• Pump station piping

• Large-diameter water mains

3.5 Shipbuilding & Offshore

• Seawater cooling systems

• Hydraulic piping

4. Selection & Installation Considerations

4.1 Design Factors

• Pressure Rating (e.g., ASME Class 150, 300, 600, 900, 1500, 2500)

• Temperature Resistance

• Fluid Compatibility (corrosion/erosion risks)

4.2 Installation Best Practices

• Proper Gasket Selection (e.g., spiral wound, PTFE, graphite)

• Bolt Torque Sequencing to ensure even compression

• Alignment Checks to prevent flange warping

• Post-Weld Heat Treatment (PWHT) for carbon steel in critical service

5. Standards & Compliance

• ASME B16.5 - Standard for pipe flanges up to 24"

• ASME B16.47 - Large-diameter flanges (Series A/B)

• 6A - Wellhead and Christmas tree flanges

• EN 1092-1 - European flange standards

6. Maintenance & Inspection

• Leak Testing (hydrostatic/pneumatic)

• Bolt Retorquing after initial operation

• Corrosion Monitoring (CUI, pitting)

• Ultrasonic Testing (UT) for crack detection

Detailed Photos

Certifications

Packaging & Shipping

1.Export sea worthy package + water proof paper
2.Safe loading and fixing Professional teams

Delivery Detail: within 7-10 working days after receiving the deposit or according to your order quantity.