A Blind Flange is an essential piping component used to seal off the ends of pipelines, valves, and pressure vessels. Unlike other flanges, blind flanges do not have a bore and are commonly used for maintenance, pressure testing, and system modifications.
Blind flanges are widely used in oil & gas, water treatment, power plants, and chemical industries, making them a crucial part of industrial piping systems.
What is a Blind Flange?
A blind flange is a solid disk-like plate with bolt holes that allows it to be securely attached to the end of a pipe. It serves as a sealing mechanism to prevent the passage of fluids or gases within a pipeline.
Key Features of Blind Flanges:
Seals off pipeline ends, preventing leaks or contamination.
Can be easily removed for pipeline expansion or modifications.
Available in multiple materials, including mild steel (MS), stainless steel (SS), and galvanized iron (GI).
Manufactured as per international standards such as ASME B16.5, ANSI B16.47, and IS 6392.
Types of Blind Flanges
Blind flanges come in different variations based on material composition, pressure rating, and flange design.
1. Mild Steel (MS) Blind Flange
Made from Mild Steel, offering affordability and durability.
Ideal for low to medium-pressure applications.
Commonly used in water supply networks, industrial plants, and HVAC systems.
2. Stainless Steel (SS) Blind Flange
Corrosion-resistant and highly durable.
Suitable for chemical, pharmaceutical, and food industries.
Withstands high temperatures and extreme environments.
3. Galvanized Iron (GI) Blind Flange
Coated with zinc to prevent rusting.
Used in outdoor applications and water distribution systems.
4. Raised Face Blind Flange
Has a slightly raised face around the sealing surface.
Helps in better gasket seating and leak prevention.
Used in high-pressure pipeline applications.
5. Flat Face Blind Flange
The entire flange face is flat with no raised area.
Commonly used in low-pressure applications where bolt tension is evenly distributed.
6. High-Pressure Blind Flange
Designed for extreme pressure conditions.
Used in power plants, refineries, and heavy industrial applications.
Applications of Blind Flanges
Blind flanges play a crucial role in various industries due to their sealing efficiency and easy removability.
1. Oil & Gas Industry
Used to seal pipeline ends during maintenance and testing.
Prevents leakage of high-pressure gases and fluids.
2. Water Treatment Plants
Used in pumping stations, reservoirs, and filtration units.
Ensures safe handling of treated water and wastewater.
3. Power Plants
Installed in steam pipelines, cooling water systems, and pressure vessels.
Prevents fluid loss and ensures system safety.
4. Chemical & Fertilizer Industry
Used in chemical processing pipelines handling hazardous fluids.
Withstands corrosive environments.
5. Construction & Infrastructure
Applied in HVAC, drainage, and plumbing systems.
Ensures safe termination of unused pipelines.
6. Marine & Shipbuilding
Installed in ship pipelines handling fuel and seawater.
Ensures safe and leak-proof sealing.
Advantages of Blind Flanges
Blind flanges offer several benefits in industrial applications.
1. Leak Prevention
Completely seals off pipeline ends, preventing leaks and contamination.
2. Easy Installation & Removal
Can be bolted or unbolted for maintenance and expansion.
3. Cost-Effective
More affordable than permanent welded closures.
4. High-Pressure Resistance
Withstands extreme pressure and temperature conditions.
5. Versatility
Available in various materials and sizes for different applications.
Standard Sizes & Specifications of Blind Flanges
Below is a standard dimension chart for blind flanges.
| Nominal Pipe Size (NPS) | Flange Diameter (mm) | Bolt Hole Diameter (mm) | Number of Bolts |
|---|---|---|---|
| 1/2" | 90 | 15 | 4 |
| 1" | 125 | 19 | 4 |
| 2" | 150 | 19 | 4 |
| 4" | 230 | 19 | 8 |
| 6" | 280 | 22 | 8 |
| 8" | 345 | 22 | 8 |
| 10" | 405 | 25 | 12 |
Where to Buy High-Quality Blind Flanges?
For premium-quality Blind Flanges, choose Udhhyog, a leading manufacturer and supplier in Delhi, Haryana, Uttar Pradesh, and Jammu & Kashmir.
Why Choose Udhhyog?
✅ High-Quality Materials – MS, SS, and GI Blind Flanges.
✅ Customization Available – Flanges tailored to industry requirements.
✅ Competitive Pricing – Best rates for bulk and individual orders.
✅ On-Time Delivery – Reliable supply chain across India.
Conclusion
Blind Flanges are critical in industrial piping systems, ensuring safe sealing, easy maintenance, and system integrity. Whether used in oil & gas, power plants, or water treatment facilities, choosing a high-quality blind flange is crucial.
For superior MS Blind Flanges, trust Udhhyog, your trusted supplier in North India.
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