Blind Flanges
What are Blind Flanges?
Blind flanges are solid disk-shaped flanges used to close the ends of piping systems, valves, or pressure vessel openings. Without a central bore, they provide a tight seal and allow for easy inspection, maintenance, or modification of systems. Ideal for high-pressure and high-temperature environments, blind flanges are widely used across industries that demand full isolation of fluid flow.
Asiad Steel Industries is a trusted manufacturer and exporter of precision-engineered blind flanges in carbon steel, stainless steel, and alloy grades.
Key Features
- Full Flow Isolation – Provides complete shut-off in piping systems.
- High Pressure Handling – Designed to withstand extreme internal loads.
- Corrosion & Heat Resistant – Suitable for aggressive fluid and temperature exposure.
- Versatile Applications – Used in process plants, chemical piping, and vessel ends.
- Easy Access – Allows future expansion, inspection, or pipeline modification.
Specifications
Mechanical Properties
Chemical Composition
Equivalent Grades
Weight Chart
Specifications
| Parameter | Details |
|---|---|
| Sizes | ½” to 60” (DN15 – DN1500) |
| Pressure Ratings | Class 150 to 2500, PN 6 to PN 250 |
| Face Types | RF, RTJ, FF |
| Standards | ANSI, ASME B16.5, EN 1092-1, DIN, BS |
| Material Options | CS, SS 304/316, Alloy Steel, Duplex |
| Coating | Bare, Anti-rust Coated, Painted, Galvanized |
| Property | Value |
|---|---|
| Tensile Strength | 485 – 750 MPa |
| Yield Strength | 205 – 450 MPa |
| Hardness | 120 – 250 HB |
| Elongation | 20% – 30% |
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.08 – 0.25 |
| Manganese | 0.60 – 1.65 |
| Silicon | 0.15 – 0.80 |
| Chromium | 16.0 – 18.0 (SS) |
| Nickel | 8.0 – 10.5 (SS) |
| Molybdenum | 2.0 – 3.0 (316) |
| Iron (Fe) | Balance |
| Standard | Equivalent Grade |
|---|---|
| ASTM | A105, A182 F304/F316 |
| ASME | B16.5 |
| EN | 1.4301, 1.4401 |
| DIN | PN10/16, DIN 2527 |
| Flange Size | Pressure Class | Approx. Weight (kg) |
|---|---|---|
| 2” | 150# | 4.2 |
| 4” | 300# | 12.5 |
| 6” | 600# | 28.0 |
| 10” | 900# | 74.5 |
| 16” | 1500# | 195.0 |
Applications of Blind Flanges
Construction &
Infrastructure
Automotive & Heavy
Equipment
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
Do you have questions?
When should I use a blind flange?
Use blind flanges when you need a temporary or permanent seal at the end of piping systems or pressure vessels.
Can blind flanges handle high pressure?
Yes, they are ideal for high-pressure applications and available up to Class 2500.
Are they available in different materials?
Yes, we offer CS, SS 304/316, duplex, and special alloy blind flanges.
Do blind flanges allow system access for maintenance?
Yes, they are commonly used where system access is required during shutdown or testing.
