S K Forgefit LLP

A figure-8 blind flange, also known as a spectacle blind flange, is a type of flange used to isolate a section of pipeline or equipment. It is made of two metal discs, one solid and one hollow, that are connected by a web. The hollow disc has the same inside diameter as the pipe flanges that it is used with.

Figure-8 blind flanges are typically used in permanent or long-term isolation applications. They are not like valves, which can be opened and closed. Instead, figure-8 blind flanges are used to block the flow of fluid through a pipeline.

Figure-8 blind flanges are available in a variety of materials, including carbon steel, stainless steel, and alloy steel. They are also available in a variety of sizes and ratings.

The technical specifications of figure-8 blind flanges are typically defined by the ASME B16.48 standard. This standard specifies the dimensions, tolerances, and materials for figure-8 blind flanges.

Here are some of the key technical specifications of figure-8 blind flanges:

• Outside diameter (OD): The OD of a figure-8 blind flange is the same as the OD of the pipe flanges that it is used with.
• Inside diameter (ID): The ID of the hollow disc is the same as the ID of the pipe flanges that it is used with.
• Thickness: The thickness of a figure-8 blind flange is typically 1/2" to 1".
• Rating: Figure-8 blind flanges are available in a variety of ratings, including 150#, 300#, 600#, 900#, 1500#, and 2500#.
• Material: Figure-8 blind flanges are available in a variety of materials, including carbon steel, stainless steel, and alloy steel.

Figure-8 blind flanges are a versatile and reliable way to isolate a section of pipeline or equipment. They are available in a variety of sizes, ratings, and materials to meet the needs of most applications.

Here are some of the benefits of using figure-8 blind flanges:

• They are a permanent or long-term isolation solution.
• They are available in a variety of sizes, ratings, and materials.
• They are relatively easy to install and maintain.
• They are a cost-effective solution for isolating pipelines and equipment.