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ASTM A105 Blind Flange

Views: 5     Author: Site Editor     Publish Time: 2023-12-01      Origin: Site

ASTM A105 blind flanges are forged from carbon steel material. This type of flange has no openings in the middle and is mainly used at the end of a pipeline to provide a seal.The function of blind flanges is similar to that of pipe caps and heads, except that blind flanges can be removed, which reduces the maintenance cost of the pipeline. Therefore, blind flanges are also widely used in industrial pipelines.

blind flangeTypes of ASTM A105 Blind Flanges

According to the appearance, ASTM A105 blind flanges can be generally divided into two types: blind flanges and spectacle blind flanges.

The blind flange sealing surface has various types, including FF,RF,RTJ,etc.Common blind flange production standards include ASME B16.5, ASME B16.47, and EN1092-1.

ASME B16.5 and ASME B16.47 belong to the American standard system. ASME B16.5 standard mainly specifies the manufacturing parameters of flanges with a size range of 1/2 inch-24 inch and a pressure rating of CLASS150-2500;ASME B16.47 mainly specifies the manufacturing parameters of large-sized welding neck and blind flanges with a size range of 26 inch-60 inch and a pressure rating of CLASS150-900;while EN1092-1 is the European standard production standard for flanges, which is slightly different from the above two American standard flange size specifications.

ASME B16.5 CLASS 300 ASTM A105 Blind Flange Dimension

astm a105 blind flange dimension


The spectacle blind flange is a special pipe connection piece, which is named after its shape resembling the number "8".It is mainly used between pipes and flanges that require changing the flow direction, and plays a role of blocking and throttling.The spectacle blind flange is easy to use. When isolation is required, use the blind flange end;when normal operation is required, use the throttling ring end.At the same time, it can also be used to fill the installation gap of the blind flange on the pipeline.Due to its obvious identification and easy to recognize installation status, it is often used in situations where the pipeline assembly is blocked to a certain extent and then continues to be installed, such as cleaning debris.

ASME B16.48 CLASS150 Spectacle Blind Flange Dimension

Spectacle blind flange

Factors for Selecting Blind Flanges

The following factors should be considered when selecting the appropriate carbon steel blind flange:

Specification and pressure rating of the pipeline: Carbon steel blind flanges with corresponding dimensions and pressure bearing capacity are required for pipelines with different specifications and pressure ratings.Before purchasing, it is necessary to determine the parameters such as diameter, length, wall thickness, and design pressure of the pipeline to ensure that the selected carbon steel blind flanges meet the requirements for use.

Pipe materials: Different materials of carbon steel blind flanges are required for different materials of pipes to ensure the reliability and stability of the connection.For example, for carbon steel pipes, carbon steel materials such as ASTM A105 or A234 WCB can be selected;for stainless steel pipes, stainless steel materials such as 304 or 316 can be selected.If mixed with different materials of pipes, there is a risk of bad pipe sealing, resulting in pipe leakage.

Environmental conditions: It is necessary to consider the environmental conditions of the pipeline, such as temperature, humidity, corrosive substances, etc., in order to choose the appropriate carbon steel blind flange material and sealing material.

Quality assurance: Select manufacturers and brands with quality assurance to ensure that the carbon steel blind flanges purchased meet relevant standards and regulations. You can check the manufacturer's qualification certificates, quality management system certification certificates, and other relevant information to understand the quality and reliability of their products.

Convenience of installation and maintenance: Consideration should be given to the convenience of installation and maintenance.Generally speaking, the installation and maintenance of carbon steel blind flanges are relatively convenient, but factors such as size and weight should also be considered.For large or heavy carbon steel blind flanges, consideration should be given to the convenience of transportation and installation.

Selecting the appropriate carbon steel blind flange requires consideration of factors such as the specifications and pressure rating of the pipeline, the material of the pipeline, environmental conditions, quality assurance, and ease of installation and maintenance.Comprehensive analysis and selection are required based on specific circumstances to ensure that the selected carbon steel blind flange meets the requirements for use and is reliable.


In addition to sealing the pipeline, the ASTM A105 blind flange can also serve as a barrier to isolate a section of the pipeline system during maintenance, cleaning, or equipment replacement.In this case, the blind flange can separate a section of the pipeline system from the rest, facilitating maintenance and cleaning operations.

Blind flanges can also be used to prevent mixing and contamination of media.In piping systems, it is sometimes necessary to isolate pipes with different media to prevent mixing and contamination during maintenance or equipment replacement.In this case, blind flanges can play their isolating role by separating pipes with different media.

In short, blind flanges have various uses in pipeline systems, including isolation, sealing, blocking, preventing mixing and contamination of media, and preventing leakage of media and environmental pollution.

Shanghai Zhucheng Pipe Fitting Manufacturing Co., Ltd. has been committed to the production and sales of pipes and fittings for many years, and enjoys a good reputation in the industry. We are the professional and high-quality supplier for customers.

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