ANSI B16.5 Flange

QS Flange: ANSI B16.5 Flange

Name: ANSI B16.5 Flange
Standard: ANSI B16.5
Size: 1/2 to 24 Inch
Pressure: 150LB to 600LB
Material: Carbon Steel
Process Method: Forged
Face: RF
Usage: Used in the Fields of Construction, Chemical Engineering, Petroleum and Natural Gas.

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The ANSI B16.5 Flange is a high-quality pipe fitting compliant with the ANSI B16.5 standard, available in sizes ranging from ½ inch to 24 inches with pressure ratings from 150LB to 600LB, making it suitable for high-pressure and high-temperature applications. Manufactured through precision carbon steel forging, it ensures high strength and durability, featuring a Raised Face (RF) sealing surface for leak-proof connections. Widely used in construction, chemical, petroleum, and natural gas industries, the ANSI B16.5 Flange is a reliable solution for pipeline systems.

1. Slip-On Flange (SO) – A Common Type of ANSI B16.5 Flange
The Slip-On Flange (SO) is a widely used flange type under the ANSI B16.5 Flange standard, known for its simple structure and easy installation, making it ideal for low-pressure piping systems. Its key feature is a slightly larger inner diameter than the pipe’s outer diameter, allowing it to slide over the pipe before being double-welded (inside and outside) for secure fixation.

2. Key Technical Specifications of ANSI B16.5 Flange
- Standard Compliance: ANSI B16.5 (Latest Edition: B16.5-2020)
- Size Range: ½"(DN15) to 24"(DN600)
- Pressure Rating:
- 150LB (PN20), 300LB (PN50)
- Maximum Recommended: 600LB (PN100) (requires enhanced weld quality)

- Material:
- ASTM A105 (Carbon Steel)
- ASTM A350 LF2 (Low-Temp Carbon Steel)
- ASTM A694 F42/F52 (High-Strength Steel)

- Sealing Face: RF (Raised Face), FF (Flat Face)
- Installation Method:
- Internal Fillet Weld (weld leg height ≥ 1.4× pipe wall thickness)
- External Fillet Weld (weld leg height ≥ pipe wall thickness)

3. Structural Features of ANSI B16.5 Flange
1) Bore Diameter: 1.6–3.2 mm larger than pipe OD for easy fitting.

2) Welding Method:
- Inside Fillet Weld (ensures sealing integrity)
- Outside Fillet Weld (enhances structural strength)

3) Hub Length: Shorter than Weld Neck (WN) flanges, reducing material usage and cost.

4. Mechanical Properties & Design Limitations of ANSI B16.5 Flange
- Maximum Allowable Working Pressure (MAWP)
- 150LB: ~20 bar (at ambient temperature)
- 300LB: ~50 bar (at ambient temperature)
- 600LB: ~100 bar (requires special evaluation)

- Fatigue Strength: Inferior to Weld Neck (WN) flanges; ANSI B16.5 Flange is not recommended for frequent pressure fluctuations or vibration conditions.

- Temperature Limits:
- ASTM A105: -29°C to 425°C
- ASTM A350 LF2: -46°C to 343°C (suitable for low-temperature applications)

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