Blind Flanges Manufacturers Mumbai India : Specifications, Applications, and Benefits
Blind Flanges Manufacturers Mumbai India. Best Price Exporter Supplier of Customize Flange for Europe, US, UK & Gulf. Call +91-9769996991
Blind flanges by Falcon are essential components in industrial piping systems, used to seal the end of pipelines, valves, and pressure vessel openings. Unlike other flanges, blind flanges do not have a bore, making them ideal for closing pipe ends or providing access points for maintenance.
What is a Blind Flange?
A blind flange is a solid disc with bolt holes around the perimeter, designed to block fluid or gas flow in a piping system. It provides a secure closure, allowing for easy access to pipelines when maintenance or system modifications are needed.
Key Features of Blind Flanges:
✔ Completely blocks pipe flow, preventing leakage.
✔ Designed for high-pressure and high-temperature applications.
✔ Available in multiple materials, including carbon steel, stainless steel, and alloy steel.
✔ Used in pipelines where future expansion or maintenance is required.
Types of Blind Flanges
Blind flanges are classified based on face type and pressure rating.
1. Raised Face (RF) Blind Flange
- Has a slightly raised sealing surface to enhance gasket compression.
- Ideal for high-pressure applications.
2. Flat Face (FF) Blind Flange
- Entire sealing surface is flat.
- Suitable for low-pressure piping systems.
3. Ring-Type Joint (RTJ) Blind Flange
- Features a groove for a metal gasket, ensuring a leak-proof seal.
- Used in extreme pressure and temperature applications.
Benefits of Using Blind Flanges
✔ Leak Prevention – Ensures complete pipeline closure.
✔ High Durability – Made from strong materials to withstand pressure.
✔ Corrosion Resistance – Available in stainless steel, duplex steel, and coated alloys.
✔ Easy Maintenance – Provides access for cleaning and repairs.
✔ Versatile Applications – Used in oil & gas, chemical, water treatment, and power plants.
Blind Flange Specifications
Blind flanges must comply with international standards to ensure safety, compatibility, and durability.
1. Standard Specifications
Blind flanges are manufactured following industry standards:
- ASME/ANSI B16.5 – Covers flanges up to 24 inches.
- ASME B16.47 – Covers flanges larger than 24 inches.
- EN 1092-1 – European standard for steel flanges.
- DIN 2527 – German standard for blind flanges.
- JIS B2220 – Japanese industrial standard.
2. Material Specifications
Blind flanges are available in various materials depending on temperature, pressure, and corrosion resistance.
| Material | Properties & Applications |
|---|---|
| Carbon Steel | High strength, used in industrial pipelines. |
| Stainless Steel | Corrosion-resistant, ideal for marine and chemical environments. |
| Alloy Steel | Suitable for extreme temperature and pressure conditions. |
| Duplex Steel | High corrosion resistance, used in offshore applications. |
| Nickel & Copper Alloys | Resistant to acidic and seawater environments. |
3. Size & Dimensions
Blind flanges come in various sizes and pressure ratings.
Common Blind Flange Dimensions (ANSI B16.5 Standard)
| Nominal Pipe Size (NPS) | Outer Diameter (OD) mm | Bolt Circle Diameter (BCD) mm | Number of Bolt Holes |
|---|---|---|---|
| ½” | 90 | 60 | 4 |
| 1″ | 125 | 90 | 4 |
| 2″ | 150 | 120 | 4 |
| 4″ | 230 | 190 | 8 |
| 6″ | 280 | 241 | 8 |
| 8″ | 345 | 298 | 8 |
| 10″ | 405 | 362 | 12 |
| 12″ | 485 | 432 | 12 |
(Note: Dimensions may vary based on pressure ratings and specific industry standards.)
4. Pressure Ratings
Blind flanges are available in different pressure classes, each designed for specific pressure conditions.
| Class (ANSI/ASME B16.5) | Maximum Pressure (PSI) |
|---|---|
| Class 150 | 285 PSI |
| Class 300 | 740 PSI |
| Class 600 | 1,480 PSI |
| Class 900 | 2,220 PSI |
| Class 1500 | 3,700 PSI |
| Class 2500 | 6,170 PSI |
Higher pressure ratings provide better durability and leak protection in critical applications.
Common Applications of Blind Flanges
🔹 Oil & Gas Industry – Used in refineries and offshore platforms.
🔹 Chemical Processing Plants – Blocks pipelines in corrosive environments.
🔹 Water Treatment Systems – Ensures leak-free system closure.
🔹 Power Plants – Used in steam and gas pipelines.
🔹 Shipbuilding & Marine Applications – Resistant to seawater corrosion.
Maintenance & Care Tips
✔ Regular Inspection – Check for corrosion and wear.
✔ Clean the Surface – Remove dirt and residue before installation.
✔ Use High-Quality Gaskets – Ensure a proper seal for leak prevention.
✔ Bolt Tightening – Follow manufacturer torque specifications.
Frequently Asked Questions (FAQs)
1. What is the purpose of a blind flange?
A blind flange is used to close the end of a pipeline to stop the flow of liquids or gases while allowing easy access for future maintenance or expansion.
2. Can a blind flange be reused?
Yes, if it is in good condition. However, gaskets should always be replaced for a secure seal.
3. How do I choose the right blind flange for my application?
Consider pipe size, pressure rating, material compatibility, and temperature conditions before selecting a blind flange.
4. Do blind flanges require gaskets?
Yes, gaskets are essential to ensure a tight, leak-proof seal between the flange and the pipe.
5. Are blind flanges suitable for high-pressure applications?
Yes, RTJ blind flanges are designed for extreme pressure and temperature conditions. Choose the appropriate pressure rating (Class 600, 900, 1500, etc.) based on system requirements.
Blind flanges play a vital role in industrial piping systems by sealing pipelines, providing access for maintenance, and ensuring leak-proof closures. By understanding their types, specifications, and pressure ratings, you can choose the best blind flange for your project.
For high-quality blind flanges, always select a certified supplier that meets ASME, DIN, and EN standards.