Super Duplex and API 6A Flanges Delivered to Singapore for High-Pressure Applications

Haihao Group has successfully completed the shipment of high-pressure forged flanges to a customer in Singapore, supporting critical offshore, oil & gas, and high-integrity pipeline systems. The order includes super duplex compact flanges and API 6A RTJ weld neck flanges, all manufactured in strict accordance with international standards and NACE requirements.

These flanges are designed for demanding service conditions involving high pressure, low temperature, and sour environments, where material reliability and dimensional precision are essential.

API 6A Type 6BX RTJ weld neck flange 10000 PSI

Supplied Flange Specifications

Super Duplex Compact Flange (IX Seal Ring)

• Product: Weld Neck Compact Flange with IX Seal Ring
• Size: 8″
• Wall Thickness: SCH 120
• Pressure Rating: Class 2500
• Material: ASTM A182 Grade F55 (Super Duplex Stainless Steel)
• Standard: BS EN ISO 27509
• Compliance: NACE MR-01-75

The compact flange design significantly reduces weight and installation space while maintaining excellent sealing performance under high pressure.

API 6A RTJ Weld Neck Flanges

• Product Type: Weld Neck RTJ Flange
• Sizes:
  • 5-1/8″ RTJ
  • 7-1/16″ RTJ
• Pressure Rating: 10,000 PSI
• Material: ASTM A182 Grade F55
• Standard: API 6A Type 6BX
• Compliance: NACE

These API 6A flanges are commonly used in wellhead and Christmas tree systems, offering reliable metal-to-metal sealing for extreme pressure conditions.

Material Performance and Testing

All supplied ASTM A182 F55 super duplex flanges fully meet NACE requirements and were delivered with controlled heat treatment. Key performance features include:

• Ferrite content: 35–55%
• Low-temperature impact testing: Qualified down to –46°C
• Excellent resistance to chloride corrosion and sulfide stress cracking

These characteristics make the flanges suitable for offshore platforms, subsea systems, and sour service pipelines.

Applications in Singapore’s Energy Sector

The delivered super duplex compact flanges and API 6A RTJ flanges are widely used in:

• Offshore oil and gas production facilities
• High-pressure wellhead systems
• Subsea and topside pipeline connections
• Sour service and low-temperature environments

Their long service life and stable sealing performance help reduce maintenance costs and operational risk.

Haihao Group – Trusted Supplier of High-Pressure Flanges

Haihao Group specializes in the manufacturing and export of forged steel flanges, including super duplex flanges, API 6A flanges, compact flanges, and RTJ flanges.

Remembering our earlier discussions, this project further demonstrates Haihao Group’s experience in supplying NACE-compliant products to Southeast Asia and global energy markets.