Haihao Group Supplies ASTM A105N Weld Neck and Orifice Flanges to a UAE Project
As part of its growing presence in the Middle East, Haihao Group has successfully completed the production and delivery of a batch of weld neck and orifice flanges for a major pipeline project in the United Arab Emirates (UAE).
All flanges were manufactured in strict accordance with ASME B16.5 and ASME B16.47 Series A standards, using ASTM A105 / A105N normalized carbon steel to guarantee excellent mechanical strength, pressure resistance, and long-term reliability under demanding service conditions.
ASTM A105N ASME B16.5 and B16.47 weld neck flanges manufactured by Haihao Group
Product Overview
| Product Type | Size (Inch) | Pressure Class | Schedule | Material | Standard |
|---|---|---|---|---|---|
| Orifice Weld Neck Flange RF | 24″ | 300LB | SCH XS | ASTM A105N | ASME B16.5 |
| Weld Neck Flange RF | 20″ | 300LB | SCH STD | ASTM A105N | ASME B16.5 |
| Orifice Weld Neck Flange RF | 8″ | 300LB | SCH 80 | ASTM A105N | ASME B16.5 |
| Orifice Weld Neck Flange RTJ | 14″ | 300LB | SCH 40 | ASTM A105N | ASME B16.5 |
| Weld Neck Flange RF | 4″ | 300LB | SCH 40 | ASTM A105 | ASME B16.5 |
| Weld Neck Flange RF | 1-1/2″ | 300LB | SCH XXS | ASTM A105 | ASME B16.5 |
| Weld Neck Flange RF | 26″ | 300LB | SCH XS | ASTM A105N | ASME B16.47 |
| Weld Neck Flange RF | 36″ | 150LB | SCH XS | ASTM A105N | ASME B16.47 Series-A |
These weld neck and orifice flanges were designed for high-pressure pipeline systems, featuring raised face (RF) and ring type joint (RTJ) connections to ensure superior sealing performance.
The materials conform to ASTM A105N for normalized carbon steel and comply with NACE MR0175 / ISO 15156 for sour service applications, ensuring resistance to hydrogen sulfide (H₂S) and corrosive environments in oil and gas service.
Technical Excellence and Quality Assurance
Each flange underwent a full range of dimensional, pressure, and visual inspections before shipment.
Key manufacturing and quality features include:
- Design & Dimension Standards: ASME B16.5 / B16.47 / ASME B36.10
- Material Traceability: Full MTC (EN 10204 3.1) provided with heat number tracking
- Surface Finish: Precisely machined raised face (RF) and RTJ sealing surfaces
- Service Compliance: NACE MR0175 / ISO 15156 for sour service environments
- Testing: Dimensional, PMI, and hydrostatic testing before dispatch
Haihao’s commitment to strict quality control ensures that each flange meets the mechanical strength and corrosion resistance required by high-performance pipeline systems.
Applications
These ASTM A105N weld neck flanges are suitable for:
- Oil and gas transmission pipelines
- Petrochemical processing plants
- Refinery high-pressure lines
- Offshore and onshore production facilities
- Power generation piping systems
Their butt-weld connection ensures smooth flow transition, reducing turbulence and erosion at the joint – making them ideal for high-temperature and high-pressure operations.
Haihao Group – Your Reliable Flange Manufacturer
With over 40 years of experience in flange and pipe fitting manufacturing, Haihao Group provides integrated piping solutions covering ASME, DIN, EN, and JIS standards.
Our products have been exported to more than 100 countries, serving EPC contractors and energy companies across the Middle East, Europe, and Southeast Asia.
From ASME B16.5 weld neck flanges to ASME B16.47 large-diameter flanges, Haihao Group delivers consistent quality, competitive pricing, and reliable after-sales support to global customers.