Haihao Group Delivers BS4504 and ASME B16.5 Carbon Steel Flanges to Qatar

Haihao Group is proud to announce the successful delivery of a large batch of BS4504 and ASME B16.5 carbon steel flanges to a long-term customer in Qatar. This shipment includes a complete range of Slip-On, Weld Neck, Blind, and Threaded flanges, all precision-forged from ASTM A105 carbon steel to meet the demanding requirements of modern pipeline systems.

Designed and produced to international standards, these flanges provide exceptional sealing performance, pressure resistance, and dimensional accuracy for critical applications in the oil, gas, and chemical industries.

 

Diverse Range of Flanges Delivered

The Qatar shipment covered multiple specifications, showcasing Haihao Group’s ability to meet complex, mixed-standard project requirements:

• BS4504 Carbon Steel Slip-On Flanges (PN16 & PN25) – Sizes from 1″ to 16″, forged and machined with raised face (RF) finish.

• ASME B16.5 Slip-On and Blind Flanges (Class 150) – Commonly used in process piping and refinery systems.

• BS4504 Weld Neck Flanges (PN16) – Sizes up to 30″, ideal for high-pressure and high-temperature service.

• Threaded Flanges (BSPT, PN16) – Engineered for easy installation without welding.

Each flange was meticulously produced with tight tolerance control and strict compliance to the BS4504 and ASME B16.5 dimensional standards.

Quality Control and Documentation

Quality assurance is at the core of Haihao Group’s manufacturing philosophy.
Every carbon steel flange underwent comprehensive inspection and verification, including:

• Dimensional accuracy checks

• Non-destructive testing (NDT)

• Surface and coating inspection

• Pressure and sealing performance testing

All products were accompanied by complete quality documentation, such as Material Test Certificates (MTC EN10204 3.1) and inspection reports, ensuring full traceability from raw material to final shipment.

Supporting Qatar’s Energy Infrastructure

These forged ASTM A105 carbon steel flanges will be integrated into Qatar’s energy, water treatment, and industrial pipeline networks, where strength, corrosion resistance, and precision alignment are essential.

Haihao Group’s consistent delivery of custom-engineered flange solutions demonstrates its commitment to supporting global clients with reliable, high-performance pipeline components that meet BS4504 and ASME B16.5 requirements.

Trusted Partner in Global Flange Manufacturing

With over four decades of manufacturing expertise, Haihao Group has become a recognized supplier of forged steel flanges and pipe fittings worldwide.
Our integrated production facilities, advanced testing equipment, and certified quality system ensure that every flange meets international expectations for safety and durability.

Whether your project requires PN-rated BS4504 flanges or Class-rated ASME B16.5 flanges, Haihao Group offers a one-stop solution tailored to your engineering needs.