Product Specification

A182 F316L Spectacle Blind Flange Figure-8 B16.48, Stainless Steel Piping Components

The F316L Figure-8 blind flange is a pipeline isolation device made of ultra-low carbon stainless steel (F316L). Shaped like the figure "8," it features a solid blind plate at one end to completely block medium flow and a hollow ring plate at the other to allow pipeline passage, enabling physical isolation through rotational switching.

Benefiting from the excellent intergranular corrosion resistance and pitting corrosion resistance of F316L material, it is particularly suitable for high-temperature, highly corrosive chemical, or marine environments. Its surface is typically treated with pickling and passivation to form a dense oxide layer, enhancing durability. The sealing surface is precision-machined to ensure zero leakage, making it widely used in critical pipeline systems such as those in the oil, natural gas, and nuclear power industries that require absolute safety isolation.

The A182 F316L Spectacle Blind Flange with a Figure-8 design and in accordance with B16.48 is a specific type of spectacle blind flange designed for use in industrial piping systems. Below is a breakdown of its specifications:

1. A182 F316L Material

A182 refers to ASTM A182—a specification for forged or rolled alloy and stainless steel pipe flanges, fittings, valves, and parts.

F316L is the material grade:

• ''F'' indicates it is a forged material.

• 316L refers to a low-carbon version of 316 stainless steel, which provides superior resistance to corrosion, especially in chloride-rich environments, such as in marine or chemical industries.

• The ''L'' in 316L means it has lower carbon content, making it less susceptible to carbide precipitation and improving its weldability and resistance to intergranular corrosion.

2. Spectacle Blind Flange (Figure-8)

• The spectacle blind flange consists of two discs: one is a blind flange (covering the pipeline), and the other is a full-flow opening. The Figure-8 design refers to a specific shape of the blind that is often used for easier installation and handling.

• The Figure-8 design generally has a "spectacle" shape, where one part covers the opening and the other part allows the flow of the pipeline. This dual function makes it suitable for isolating and temporarily blocking flow in a pipeline, allowing for maintenance or modification of a system.

• It is typically installed between two flanges and bolted or welded into place.

3. B16.48 Standard

B16.48 refers to the ASME B16.48 standard, which covers the design, material, and testing requirements for spectacle blind flanges used in piping systems.

• This standard defines the dimensions, tolerances, and other mechanical properties to ensure uniformity and compatibility across different systems.

• B16.48 is part of the ASME B16 series, which also covers other piping components like flanges and fittings.

• The B16.48 standard ensures that the spectacle blind flanges are dimensionally correct and safe to use in high-pressure or critical applications.

4. Applications

A182 F316L Spectacle Blind Flange Figure-8 B16.48 is used primarily in:

• Piping systems in chemical, petrochemical, and marine applications where high resistance to corrosion, especially from chloride, is required.

• Isolation of pipelines for maintenance or repair.

• High-pressure and high-temperature environments where the flange must withstand harsh operating conditions.

• Systems requiring frequent maintenance where isolating and restoring the flow is often necessary.

5. Key Features

• Material: High corrosion resistance due to 316L stainless steel.

• Design: Figure-8 for ease of use and better flow isolation.

• Compliance: Conforms to ASME B16.48 for consistent dimensions and safety standards.

• Versatility: Can be used in high-pressure and high-temperature systems.

• Corrosion Resistance: Excellent in marine, chemical, and acidic environments due to 316L composition.

6. Advantages of A182 F316L Spectacle Blind Flange

• Superior Durability: The 316L material offers excellent strength and resistance to oxidation and corrosion, making it ideal for harsh or high-temperature environments.

• Ease of Maintenance: The spectacle blind design allows for easy installation and removal, providing efficient isolation of parts of the pipeline during maintenance.

• Long Service Life: The low-carbon content in 316L stainless steel improves its resistance to intergranular corrosion, ensuring a longer lifespan in challenging environments.