Flanges play a crucial role in industrial piping systems by connecting and sealing pipelines. Among the different types of flanges, the blind flange is particularly important as it is used to seal the end of a piping system when flow needs to be stopped or temporarily blocked.
GI blind flanges, made from galvanized iron, are widely used in various industries for their corrosion resistance and durability. Additionally, blind flanges must meet specific industry standards such as ASME B16.47 and ASME B16.5, ensuring safety and reliability.
This article explores the purpose of blind flanges, their industrial uses, GI flange advantages, and compliance with ASME standards, particularly in Udhhyog industries.
What is a Blind Flange?
A blind flange is a solid, circular plate with no bore (opening), used to block off a pipeline or create a dead-end in a piping system. Unlike other flanges, blind flanges do not allow fluid or gas to pass through, making them ideal for:
✅ Sealing pipes during maintenance
✅ Isolating pipeline sections for testing
✅ Temporary or permanent closure of pipelines
✅ Future pipeline extensions
Materials Used in Blind Flanges
Blind flanges are manufactured from various materials based on industrial requirements:
- Galvanized Iron (GI) – Cost-effective and corrosion-resistant
- Stainless Steel (SS) – High durability and heat resistance
- Carbon Steel – Strong but prone to rust if not coated
- Alloy Steel – Designed for high-pressure applications
Among these, GI blind flanges are widely used in Udhhyog industries due to their affordability, corrosion resistance, and suitability for general-purpose applications.
Purpose of Blind Flanges in Industrial Applications
Blind flanges serve multiple purposes in different industrial sectors:
1. Sealing Pipelines for Maintenance
- Used to temporarily shut down a section of a pipeline for repairs.
- Prevents fluid or gas leaks during maintenance work.
2. Pressure Testing & Inspection
- Essential for hydrostatic testing in new pipeline installations.
- Ensures that pipelines can withstand pressure without leaks before operation.
3. Pipeline Modifications & Expansion
- Allows for future extensions in piping systems by capping unused sections.
- Eliminates the need for complete dismantling during expansion.
4. Enhancing System Safety
- Prevents the accidental flow of hazardous fluids or gases in industrial plants.
- Used in chemical, petrochemical, and oil & gas industries for added security.
GI Blind Flange: Uses in Udhhyog Industries
The Udhhyog sector, which covers various industries including manufacturing, construction, oil & gas, and water supply, extensively relies on GI blind flanges. Here’s why:
1. Water Supply & Treatment Plants
- Used to seal water pipelines in municipal and industrial water systems.
- Helps in water conservation by preventing unnecessary leaks.
2. Oil & Gas Industry
- Seals off pipeline sections in refineries and offshore drilling sites.
- Protects pipelines during shutdowns and safety inspections.
3. Fire Protection Systems
- Integral in fire sprinkler and hydrant systems, ensuring emergency readiness.
- Used to regulate flow and isolate specific sections when needed.
4. HVAC & Air Distribution Systems
- Closes off air ducts and HVAC pipelines in commercial and industrial buildings.
- Helps in regulating ventilation and airflow efficiently.
5. Chemical Processing Plants
- Ensures safe handling of hazardous chemicals by sealing pipeline ends.
- Used in chemical transport pipelines to prevent leaks.
These applications demonstrate why GI blind flanges are an essential component in Udhhyog industries, providing reliability, affordability, and ease of use.
Standard Dimensions of GI Blind Flanges
Blind flanges are available in various sizes and dimensions, depending on pipeline requirements. The table below highlights common GI blind flange dimensions:
| Pipe Size (NPS) | Outside Diameter (mm) | Bolt Circle Diameter (mm) | Bolt Hole Diameter (mm) | Thickness (mm) |
|---|---|---|---|---|
| ½" | 90 | 60 | 15 | 12 |
| 1" | 125 | 90 | 17 | 14 |
| 2" | 150 | 120 | 19 | 16 |
| 4" | 230 | 190 | 23 | 18 |
| 6" | 280 | 240 | 25 | 20 |
| 8" | 345 | 295 | 27 | 22 |
| 10" | 405 | 350 | 30 | 24 |
| 12" | 485 | 415 | 32 | 26 |
| 16" | 650 | 560 | 36 | 30 |
| 20" | 755 | 665 | 39 | 32 |
| 24" | 865 | 775 | 42 | 34 |
These dimensions conform to ASME, ANSI, and industry standards, ensuring compatibility with industrial piping systems.
ASME Standards for Blind Flanges
What is ASME B16.47?
ASME B16.47 is a standard that covers large-diameter steel flanges (26 inches to 60 inches) used in high-pressure industrial applications.
- Series A – Thicker, heavier, used in high-pressure environments.
- Series B – Lighter, cost-effective, used in moderate pressure applications.
What is ASME B16.5?
ASME B16.5 defines flange specifications for smaller diameters (½ inch to 24 inches). It covers:
- Pressure Ratings: Class 150, 300, 600, 900, 1500, and 2500
- Materials: Carbon steel, stainless steel, galvanized iron (GI), and alloys
- Bolt Hole Configurations: Ensures secure pipe connections
Why Are ASME Standards Important?
- Ensure interchangeability between different pipeline components.
- Maintain safety and quality in industrial applications.
- Help industries under Udhhyog comply with international safety regulations.
GI Blind Flange Pricing & Cost Factors
The price of GI blind flanges varies based on several factors, including:
✔ Material Quality: Higher zinc coating = Higher price
✔ Size & Thickness: Larger, thicker flanges cost more
✔ Manufacturing Standards: ASME-certified flanges are more expensive
✔ Bulk Orders: Wholesale purchases reduce per-unit costs
Average Price Range
| Flange Size (NPS) | Estimated Price (INR per piece) |
|---|---|
| ½" – 2" | ₹100 – ₹500 |
| 3" – 6" | ₹500 – ₹1,500 |
| 8" – 12" | ₹1,500 – ₹3,500 |
| 14" – 20" | ₹4,000 – ₹8,000 |
| 24" and above | ₹8,000 – ₹15,000+ |
Prices may fluctuate based on market demand, raw material costs, and supplier location.
Conclusion
Blind flanges are a vital part of industrial piping systems, ensuring secure sealing, system maintenance, and safety. GI blind flanges, in particular, provide cost-effective and corrosion-resistant solutions for Udhhyog industries.
By following ASME B16.5 and ASME B16.47 standards, industries ensure safety, reliability, and compliance in their pipeline operations.
For high-quality GI blind flanges, always choose trusted suppliers like Udhhyog for guaranteed performance and longevity.
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