High-Quality Spectacle Blind Solutions for Sour Service and Low-Temperature Applications
Haihao Group has successfully completed the production and shipment of a wide range of spectacle blind products designed for demanding industrial environments. These components are engineered to meet strict requirements for sour service and low-temperature applications, ensuring safety and long-term performance in pipeline systems.
Comprehensive Spectacle Blind Specifications
The delivered spectacle blind products are manufactured in accordance with ASME B16.48, covering multiple sizes and pressure classes, including:
- Pressure ratings: Class 150, Class 300, and Class 900
- Sizes: from DN25 to DN500
- Materials: ASTM A516 Grade 60 and ASTM A240 UNS S31803 (Duplex Stainless Steel)
Each spectacle blind is precisely fabricated to ensure compatibility with flange systems designed under ASME B16.5.
Spectacle blind carbon steel and duplex stainless steel for pipeline isolation and sour service applications
Material Performance and Technical Requirements
For carbon steel variants, ASTM A516 Grade 60 is selected to provide excellent toughness in low-temperature environments. Key requirements include:
- Carbon content ≤ 0.23%
- Impact testing at -46°C
- Compliance with HIC (Hydrogen Induced Cracking) and SSC (Sulfide Stress Cracking) resistance
For duplex stainless steel options, UNS S31803 offers superior corrosion resistance and mechanical strength. The material is processed with:
- Solution annealing and water quenching
- Intergranular corrosion testing (ASTM A262 Practice E)
- Pitting resistance testing (ASTM G48 Method A)
- Controlled ferrite content (40–60%)
- Low-temperature impact testing at -58°C
These strict controls ensure every spectacle blind meets the demanding conditions of sour service pipelines.
Designed for Critical Pipeline Isolation
A spectacle blind is widely used for positive isolation in pipeline systems. Its dual-plate design (solid plate and spacer) allows operators to safely block or allow flow as needed. This makes it an essential component in:
- Oil and gas processing
- Petrochemical facilities
- Refinery operations
- Offshore and onshore pipeline systems
The reliability of each spectacle blind directly contributes to operational safety and maintenance efficiency.
Compliance and Documentation
All products are supplied with complete documentation, including:
- EN 10204 3.1 certification
- ISO 10474 inspection certificates
- Material test reports (MTR)
- NACE compliance documentation for sour service
Haihao Group ensures full traceability and strict adherence to project specifications.
Flexible Manufacturing Capabilities
With extensive production experience, Haihao Group offers customized spectacle blind solutions tailored to client requirements, including special materials, dimensions, and inspection standards. This flexibility ensures seamless integration into various industrial systems.