Haihao Group Ships ASTM A694 F52 Flanges for Sour Service Pipeline Project in Oman
Haihao Group has successfully completed the production and shipment of a batch of ASTM A694 F52 flanges for a pipeline project in Oman. The order includes 20-inch weld neck flanges (WN RF) and 20-inch blind flanges (RF) manufactured in accordance with ASME/ANSI B16.5. Designed for demanding oil and gas applications, these flanges meet the customer’s strict requirements for sour service, low sulfur content, and low-temperature toughness.
For projects operating in corrosive environments, material quality is just as important as dimensional accuracy. Haihao Group implemented comprehensive quality control throughout manufacturing to ensure every ASTM A694 F52 flange complies with the project specification before shipment.
ASTM A694 F52 blind flange RF for sour service pipeline project
Project Details
The supplied flanges were manufactured according to the following specifications:
| Product | Size | Pressure Class | Material | Standard |
| Weld Neck Flange RF | 20″ × 12.7 mm | Class 600 | ASTM A694 Gr. F52 | ASME/ANSI B16.5 |
| Blind Flange RF | 20″ | Class 600 | ASTM A694 Gr. F52 | ASME/ANSI B16.5 |
Project Requirements
- Material suitable for sour serviceapplications
- Sulfur content below 0.025%
- Low-temperature impact performance of 27 J at -29°C
- Full compliance with customer specifications and international standards
ASTM A694 F52 Flanges for Sour Service Applications
This shipment features ASTM A694 F52 flanges, a high-strength carbon steel material widely used in transmission pipelines and oil & gas facilities. The material provides excellent mechanical strength while maintaining good weldability for high-pressure pipeline systems.
For this Oman project, the ASTM A694 F52 flanges were produced specifically for sour service conditions. Material chemistry was carefully controlled to maintain sulfur content below 0.025%, helping improve resistance to sulfide stress cracking in hydrogen sulfide (H₂S) environments.
In addition, every ASTM A694 F52 flange was manufactured to satisfy the required low-temperature impact performance of 27 J at -29°C, ensuring reliable operation in challenging service conditions.
20 inch ASTM A694 F52 weld neck flange Class 600 manufactured by Haihao Group
Strict Manufacturing and Inspection Process
Quality assurance was integrated into every production stage to guarantee dependable performance in the field.
Haihao Group’s manufacturing process included:
- Certified raw material verification
- Precision forging and machining
- Dimensional inspection according to ASME/ANSI B16.5
- Chemical composition analysis
- Sulfur content verification (<0.025%)
- Charpy impact testing at -29°C
- Mechanical property testing
- Final visual and dimensional inspection before shipment
This comprehensive inspection procedure ensures that every ASTM A694 F52 flange delivered to the customer meets both international standards and project-specific technical requirements.
Applications of ASME B16.5 ASTM A694 F52 Flanges
The supplied weld neck flanges and blind flanges are suitable for a wide range of critical industrial systems, including:
- Oil and gas transmission pipelines
- Sour service processing facilities
- Petrochemical plants
- Offshore production platforms
- Natural gas compressor stations
- Refinery piping systems
The weld neck flange provides excellent structural strength for high-pressure piping, while the blind flange offers secure isolation for maintenance and pressure testing.
Haihao Group Supports International Pipeline Projects
Haihao Group supplies forged flanges for customers in the Middle East, Southeast Asia, Europe, and other global markets. Our manufacturing capabilities cover carbon steel, low-temperature steel, stainless steel, duplex stainless steel, nickel alloys, and other special materials.
We provide:
- ASME, ANSI, EN, DIN, JIS and GOST standard flanges
- Custom manufacturing according to project drawings
- Complete material traceability
- Mechanical testing and inspection reports
- Third-party inspection support
- Reliable export packaging and global logistics
Whether your project requires standard pipeline components or customized solutions for severe operating conditions, Haihao Group is committed to delivering products that meet international quality expectations.
Contact Haihao Group today for technical consultation and a competitive quotation for your next pipeline project.