Looking for reliable blind flange China suppliers? Our factory provides precision-engineered circular flat plates with no central opening for complete pipeline sealing. Compliant with ASME B16.5 and B16.47 standards, our flanges ensure leak-proof isolation for oil, gas, and chemical systems.
A blind flange is a precision-engineered circular flat plate designed to provide complete pipeline sealing. By eliminating the central opening and utilizing strategically distributed bolt holes, it integrates seamlessly with corresponding pipeline flanges and gaskets to create an airtight and leak-proof barrier. This critical component is essential for media isolation, enabling safe maintenance and long-term shutdowns of pipeline sections without compromising system integrity.
Designed for high-performance industrial environments, our blind flanges serve as vital safety barriers in systems transporting flammable, explosive, or corrosive media. Whether used for temporary plugging during system commissioning or permanent sealing in high-pressure chemical plants, these components ensure maximum operational safety and compliance with rigorous international engineering standards.
| Nominal Pipe Size | NPS ½ (DN15) to NPS 60 (DN1500) | Pressure Ratings | Class 150, 300, 600, 900, 1500, 2500 |
|---|---|---|---|
| Standard Compliance | ASME B16.5, ASME B16.47 Series A & B | Sealing Face (RF) | Raised Face: 2.0mm or 3.2mm platform |
| Sealing Face (FF) | Flat Face: Flush surface for rubber gaskets | Sealing Face (RTJ) | Ring Type Joint: Trapezoidal groove for high pressure |
| Carbon Steel | ASTM A105, A350 LF2 (General Purpose) | Stainless Steel | ASTM A182 F304, F316 (Corrosion Resistant) |
| Alloy Steel | ASTM A182 F5, F9 (High Temp/Pressure) | Application Scope | Oil, Gas, Chemical, Power & Water Treatment |
Acts as a fail-safe isolation barrier for hazardous, toxic, and explosive media.
Simple bolted structure allows for quick switching between open and closed states.
Full compliance with ASME standards ensures dimensional accuracy and interoperability.
Precision-machined faces guarantee zero leakage under extreme pressure and temperature.
Available in Carbon, Stainless, and Alloy steels to suit any corrosive environment.
Low-maintenance design reduces long-term operational costs in industrial piping.
Real-time tracking of NPS and Class specifications to ensure rapid dispatch.
Rigorous inspection against ASME B16.5 and B16.47 dimensional tolerances.
Full material traceability and certification for high-pressure safety standards.
Optimized shipping for heavy structural metal components to reduce lead times.
Strict separation of Stainless and Carbon steel to prevent cross-contamination.
Flexible manufacturing for non-standard dimensions and special alloy requirements.
| Performance Metric | Standard Blind Flange | Low-Quality Alternative | Premium Engineered Flange |
|---|---|---|---|
| Sealing Reliability | High | Moderate/Low | Ultra-High |
| Operational Lifespan | 5-10 Years | 1-3 Years | 15+ Years |
| Maintenance Cost | Low | High (Leakage risk) | Minimal |
| Safety Compliance | ASME Certified | Non-Standard | Full Traceability |
| Installation Speed | Fast | Variable | Instant/Precision |
RF (Raised Face) uses a raised platform and is typically paired with soft gaskets for medium-low pressure. RTJ (Ring Type Joint) features a trapezoidal groove for metal ring gaskets, specifically designed for high-pressure environments like oil and gas pipelines.
For corrosive environments, Stainless Steel blind flanges (such as ASTM A182 F304 or F316) are recommended due to their excellent corrosion resistance compared to carbon steel.
Yes, we provide blind flanges compliant with ASME B16.47 Series A and Series B for large-diameter requirements ranging from NPS 26 to NPS 60.
It provides a positive mechanical seal that completely blocks the flow of media, acting as a safety barrier during equipment replacement or emergency shutdowns to prevent hazardous leaks.
Yes, alloy steels like ASTM A182 F5 and F9 are specifically engineered for high-temperature and high-pressure service, common in power plants and refineries.
The bolt holes are precision-drilled to match the corresponding pipeline flange, allowing the blind flange to be securely fastened and compressed against a gasket to ensure a leak-proof seal.
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