API 6A Weld Neck Flange

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Description

Product Description API 6A Weld Neck Flange

The API 6A Weld Neck Flange is a high-quality flange that is widely used in the oil and gas sector, particularly for high-pressure systems. API 6A (American Petroleum Institute 6A) specifies the design, material, and production standards for wellhead and Christmas tree equipment.

API 6A Weld Neck Flange Dimension 2K, 5K, 10K, 15k & 20K

Pressure Rating (PSI)Nominal Pipe Size (NPS)Outside Diameter (OD)Flange Thickness (T)Bolt Circle Diameter (BCD)Number of BoltsBolt Size (Diameter)
2000 PSI2"5.500 in (140 mm)0.625 in (16 mm)4.875 in (124 mm)85/8 in (16 mm)
3"6.500 in (165 mm)0.625 in (16 mm)5.875 in (149 mm)85/8 in (16 mm)
4"7.000 in (178 mm)0.750 in (19 mm)6.375 in (162 mm)85/8 in (16 mm)
6"8.625 in (220 mm)0.750 in (19 mm)8.000 in (203 mm)83/4 in (19 mm)
5000 PSI2"5.500 in (140 mm)0.750 in (19 mm)5.000 in (127 mm)83/4 in (19 mm)
3"6.500 in (165 mm)0.750 in (19 mm)6.000 in (152 mm)83/4 in (19 mm)
4"7.000 in (178 mm)0.875 in (22 mm)6.500 in (165 mm)123/4 in (19 mm)
6"8.625 in (220 mm)0.875 in (22 mm)8.500 in (216 mm)127/8 in (22 mm)
10,000 PSI2"5.500 in (140 mm)1.000 in (25 mm)5.250 in (133 mm)127/8 in (22 mm)
3"6.500 in (165 mm)1.000 in (25 mm)6.250 in (159 mm)127/8 in (22 mm)
4"7.000 in (178 mm)1.125 in (29 mm)6.750 in (171 mm)167/8 in (22 mm)
6"8.625 in (220 mm)1.125 in (29 mm)8.750 in (222 mm)161 in (25 mm)
15,000 PSI2"5.500 in (140 mm)1.250 in (32 mm)5.500 in (140 mm)161 in (25 mm)
3"6.500 in (165 mm)1.250 in (32 mm)6.500 in (165 mm)161 in (25 mm)
4"7.000 in (178 mm)1.375 in (35 mm)7.000 in (178 mm)201 in (25 mm)
6"8.625 in (220 mm)1.375 in (35 mm)9.000 in (229 mm)201-1/8 in (28 mm)
20,000 PSI2"5.500 in (140 mm)1.375 in (35 mm)5.750 in (146 mm)161-1/8 in (28 mm)
3"6.500 in (165 mm)1.375 in (35 mm)7.000 in (178 mm)161-1/8 in (28 mm)
4"7.000 in (178 mm)1.500 in (38 mm)7.500 in (191 mm)201-1/8 in (28 mm)
6"8.625 in (220 mm)1.500 in (38 mm)9.500 in (241 mm)201-1/4 in (32 mm)

Pressure Rating:

  • 2000 PSI
  • 5000 PSI
  • 10,000 PSI
  • 15,000 PSI
  • 20,000 PSI

Design:

  • The Weld Neck design features a long, tapered neck that is welded to a pipe or equipment, providing a smooth, continuous transition between the flange and the pipe. This design minimizes stress concentrations and maximizes strength.
  • The neck allows for the flange to be welded directly to the pipeline, which ensures a strong, leak-proof connection.
  • Raised Face or Ring Type Joint: The flange typically features a raised face (RF) or ring-type joint (RTJ) to ensure a tight seal during operation.

Material:

  • API 6A Weld Neck Flanges are made from high-strength materials to withstand extreme conditions.
  • Common Materials:
    1. Carbon Steel: Offers strength and durability at an affordable price.
    2. Alloy Steel: Provides enhanced strength and corrosion resistance, particularly in high-temperature applications.
    3. Stainless Steel: Ideal for corrosion resistance in sour environments or those exposed to harsh chemicals.
  • Material Selection must comply with API 6A and additional standards like NACE MR0175 for sour service applications.

Durability:

  • API 6A Weld Neck Flanges are designed for long-lasting performance even under extreme pressure and temperature fluctuations.
  • Their welded connection and robust material selection ensure resistance to fatigue, corrosion, and erosion.
  • These flanges can handle demanding environments such as high-pressure, high-temperature conditions, making them ideal for critical applications in the oil and gas industry.
  • NACE MR0175 compliance ensures the flange is resistant to sulfide stress cracking in sour gas and oil environments.

Applications:

  • Oil and Gas Exploration: Used to connect various components in wellheads, manifolds, and pipelines.
  • Drilling: Common in the drilling process, where high-pressure connections are necessary.
  • Production Systems: These flanges play a critical role in the maintenance of pressure integrity in production lines.
  • Petrochemical Industry: Employed in systems that require high-pressure fluid handling.
  • Offshore Platforms: Due to their robustness and ability to handle high pressure, they are commonly used in offshore drilling and production equipment.
  • Refining and Chemical Processing: Used in systems dealing with high-pressure gases, liquids, and chemicals.

 

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