ANSI B16.5 Blind Flanges: When to Use Them in Piping Systems

When designing or maintaining industrial piping systems, selecting the right components is critical for safety, efficiency, and compliance. Among these components, ANSI B16.5 blind flanges play a unique role. As a trusted manufacturer of precision-engineered ANSI B16 5 flanges, Yulong breaks down when and why blind flanges are essential—and how our solutions outperform industry standards.

What Are ANSI B16.5 Blind Flanges? 

ANSI B16.5 blind flanges are solid discs used to seal the end of a piping system, valve, or pressure vessel opening. Unlike standard flanges, they lack a center bore, making them ideal for:
Temporary system isolation during maintenance or inspections.
Pressure testing pipelines without disassembling the entire structure.
Future system expansion, preserving connection points for later modifications.
Certified to ASME B16.5 specifications, these flanges withstand pressures up to 2500 psi and temperatures from -20°F to 1000°F, depending on material grades.

When to Use ANSI B16.5 Blind Flanges: 3 Key Scenarios 

1. Maintenance Safety & Efficiency
Blind flanges allow workers to safely isolate sections of pipelines for repairs. For example, in chemical plants, Yulong’s B16.5 blind flanges with PTFE-coated surfaces prevent corrosive leaks during valve replacements.

2. Hydrostatic Pressure Testing
Before commissioning pipelines, engineers use blind flanges to seal test segments. Yulong’s laser-aligned bolt holes ensure uniform gasket compression, eliminating weak points during high-pressure tests.

3. System Design Flexibility
Blind flanges act as placeholders for future connections. In LNG terminals, Yulong’s stainless steel B16.5 blinds (Grades 304/316) resist cryogenic temperatures, enabling scalable infrastructure.

Why Choose Yulong’s ANSI B16.5 Blind Flanges? 

Precision Manufacturing

Dimensional accuracy within ±0.2mm, ensuring seamless ASME B16.5 compliance.
Custom drilling patterns for non-standard bolt circles.

Material Versatility

Carbon Steel: Cost-effective for low-corrosion environments.
Stainless Steel: Ideal for chemical processing and marine applications.
Alloy 625: For extreme heat and sour gas resistance (NACE MR0175 certified).

Rapid Delivery

15-day lead time for standard sizes (NPS ½” to 24”), backed by a 10-year warranty.

Upgrade your piping systems with Yulong’s ANSI B16.5 blind flanges—where precision meets reliability.
📞 Contact our engineers today for a customized quote!
📧 Email: sales@ylsteelfittings.com | 📱 WhatsApp: 8618633700229