Blind Flange Manufacturer
High strength and durability
Excellent sealing performance
Long-term cost-effectiveness
High Quality Blind Flange
SSM provides Blind Flanges, which are flanges without holes and are typically used to close the end of a pipeline system. These flanges act as covers, providing blocking or isolation. They are commonly employed in pipeline systems that require temporary or permanent closure, such as during maintenance, overhaul, or pressure testing. Blind Flanges have the structural strength to withstand high pressure and are frequently used in applications where preventing fluid or gas leakage is essential.
- Size: 1/2″ to 48″
- Pressure Rating: Class 150, 300, 600, 900, 1500, 2500
- Joint Type: Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ)
- Material: Carbon steel, stainless steel, nickel alloy, duplex stainless steel, aluminum, copper-nickel alloy
Standard classification ：ASME/ANSI, DIN, JIS, EN
What is a Bllind Flange
A blind flange is a type of flange that does not have a hole and is typically used to close off the end of a pipe or the opening of a pressure vessel. Unlike other flanges, it does not need to be connected to a pipe. It is usually bolted to a matching flange to stop the flow of fluid or to maintain a seal in the piping system.
Welding Neck Flange Cross Section
Advantages of Blind Flanges
High strength
With its non-porous design, the Blind Flange can withstand high pressure in the system, making it suitable for high-pressure situations.
Multiple materials available
Blind Flanges can be manufactured from various materials such as carbon steel, stainless steel, and alloy steel, making them suitable for diverse media and environmental conditions.
Easy installation and disassembly
Blind Flanges can be easily installed and disassembled using bolts, making them ideal for pipeline systems that require frequent maintenance or expansion.
Isolation function
In multi-product pipeline systems, Blind Flanges can temporarily or permanently isolate different fluids, ensuring the safety and stability of the system.
Blind Flange Dimensions
Below are Class 150 Blind Flange Dimensions (ASME B16.5)
| Nominal Pipe Size (NPS) | Outside Diameter (OD) | Thickness (T) | Number of Bolts | Bolt Hole Diameter | Bolt Circle Diameter |
| 1/2″ | 3.50″ (89 mm) | 0.44″ (11.2 mm) | 4 | 0.63″ (15.9 mm) | 2.38″ (60.3 mm) |
| 1″ | 4.25″ (108 mm) | 0.56″ (14.3 mm) | 4 | 0.63″ (15.9 mm) | 3.12″ (79.4 mm) |
| 2″ | 6.00″ (152 mm) | 0.69″ (17.5 mm) | 4 | 0.75″ (19.1 mm) | 4.75″ (120.7 mm) |
| 4″ | 9.00″ (229 mm) | 0.94″ (23.9 mm) | 8 | 0.75″ (19.1 mm) | 7.50″ (190.5 mm) |
| 6″ | 11.00″ (279 mm) | 1.06″ (27 mm) | 8 | 0.88″ (22.2 mm) | 9.50″ (241.3 mm) |
| 8″ | 13.50″ (343 mm) | 1.19″ (30.2 mm) | 8 | 0.88″ (22.2 mm) | 11.75″ (298.5 mm) |
| 12″ | 16.00″ (406 mm) | 1.25″ (31.8 mm) | 12 | 0.88″ (22.2 mm) | 14.25″ (362 mm) |
| 24″ | 32.00″ (813 mm) | 2.06″ (52.3 mm) | 16 | 1.25″ (31.8 mm) | 29.50″ (749.3 mm) |
Note: Dimensions can vary slightly based on manufacturer specifications, so always consult the specific standards or manufacturer data for precise measurements.
One-Stop Flange Provider for All Your Needs
SSM has significant product advantages in manufacturing Blind Flanges. Whether it’s quality or price, we will meet your needs.
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Additional information on Blind Flange
Weld neck flange is one of the most commonly used flanges. Please continue reading for information on flange size, installation, and more.
Installation Process of Blind Flange
Here are the simplified installation steps for a blind flange:
1. Check flanges and gaskets for cleanliness and damage.
2. Align the flanges and install the gasket.
3. Insert and evenly distribute bolts around the flange.
4. Tighten the bolts in a “star” or “cross” pattern using a torque wrench.
5. Check for leaks and perform a pressure test if needed.
6. Clean the installation area and ensure all tools and waste materials are removed.
Remember to follow specific standards, ensure operator safety, and prioritize proper installation to prevent leaks and safety issues.
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FAQ
Unlike other flanges (e.g., slip-on, weld neck), blind flanges do not have a central opening. They are specifically designed to close off pipe ends and are used differently depending on the application’s needs.
The size and pressure rating of a blind flange are determined by the nominal pipe size (NPS), the pressure class (e.g., Class 150, Class 300), and the applicable standards. It’s important to match these parameters to the piping system’s specifications.
Weld Neck Flanges are commonly used in industries such as oil and gas, petrochemical, power generation, and chemical processing, where high pressure, temperature, and severe service conditions are present.
- Weld Neck Flanges have a tapered neck that is welded to the pipe, providing a strong and smooth transition.
- Slip-On Flanges slide over the pipe and are welded around the circumference, which can make them easier to install but less strong compared to Weld Neck Flanges.
- Socket Weld Flanges are used for small-bore applications and have a socket where the pipe is inserted and welded.