ASTM A516 Gr.70 Spectacle Blind Flange Shipped to Singapore for Pipeline Isolation Project
Haihao Group has recently completed the production and shipment of a 10-inch ASME B16.48 spectacle blind flange for a customer in Singapore. Manufactured from ASTM A516 Grade 70 carbon steel, the product is designed for pipeline isolation in industrial processing systems where operational safety and maintenance efficiency are essential.
This order required not only compliance with international standards but also project-specific quality requirements, including 100% PT and UT non-destructive testing on the welded handle, anti-rust oil protection.
ASTM A516 Gr.70 Spectacle Blind Flange Built to ASME B16.48
The primary product supplied in this shipment is an ASME B16.48 spectacle blind flange, manufactured with a Raised Face (RF) sealing surface and rated for Class 300 pressure service.
The ASTM A516 Gr.70 spectacle blind flange is widely used in refineries, petrochemical plants, LNG terminals, offshore platforms, and power stations. Its figure-eight design allows operators to quickly switch between open-flow and complete pipeline isolation without removing the flange assembly, significantly improving maintenance efficiency and operational safety.
ASTM A516 Gr.70 spectacle blind flange ASME B16.48 ready for shipment
Product Specification
| Product | Size | Pressure Class | Material | Standard | Sealing Face |
| Spectacle Blind Flange | 10″ | Class 300 | ASTM A516 Grade 70 | ASME B16.48 | Raised Face (RF) |
Project Requirements for the Singapore Order
Beyond dimensional accuracy, this project included several additional technical requirements to ensure long-term reliability in service.
| Inspection Item | Requirement |
| Product Standard | ASME B16.48 |
| Material | ASTM A516 Grade 70 Carbon Steel |
| Pressure Rating | Class 300 |
| Handle Weld Inspection | 100% PT and UT non-destructive testing performed |
| Surface Protection | Anti-rust oil coating applied before shipment |
Why Choose ASTM A516 Gr.70 Spectacle Blind Flanges?
The ASTM A516 Gr.70 spectacle blind flange offers excellent mechanical properties together with dependable sealing performance for medium- and high-pressure piping systems.
Its main advantages include:
- High structural strength for pressure applications
- Efficient pipeline isolation during maintenance
- Reliable RF sealing performance
- Excellent weldability and fabrication characteristics
- Suitable for refinery, petrochemical, LNG and power plant projects
- Manufactured according to ASME B16.48dimensional requirements
Because pipeline shutdowns are costly, many engineering contractors specify ASTM A516 Gr.70 spectacle blind flange products to improve operational flexibility while maintaining safety.
Comprehensive Quality Assurance Throughout Production
Haihao Group follows a strict quality management system for every pressure piping component.
For this Singapore project, the ASTM A516 Gr.70 spectacle blind flange underwent multiple inspections before shipment, including raw material verification, dimensional inspection, welding inspection, and non-destructive testing of the handle weld.
Every production step was documented to ensure complete traceability from raw material to final delivery.
Haihao Group Supplies Complete Pipeline Isolation Solutions
In addition to ASTM A516 Gr.70 spectacle blind flange products, Haihao Group manufactures a complete range of pipeline components, including:
- Spectacle blinds
- Spacer rings
- Blind flanges
- Weld neck flanges
- Slip-on flanges
- Socket weld flanges
- Threaded flanges
- Pipe fittings
- Steel pipes
- Industrial fasteners
With more than 40 years of manufacturing experience, Haihao Group serves customers in the oil & gas, chemical processing, offshore, LNG, power generation, and industrial infrastructure sectors worldwide.
If your project requires ASME B16.48 spectacle blind flange products with customized materials, pressure classes, inspection requirements, or project markings, Haihao Group can provide reliable manufacturing and worldwide delivery.