Introduction:
Blind flanges are an essential component in various piping systems as they help in maintaining the integrity of the pipelines by providing a secure and reliable isolation method. One type of blind flange that has gained popularity in recent years is the eight-character blind flange, also known as a figure 8 blind plate. In this blog, we will explore the characteristics and usage of eight-character blind flanges, highlighting their functionalities in different applications.
What is an Eight-Character Blind Flange?
An eight-character blind flange, resembling the figure 8 shape, comprises a blind plate on one end and a throttling ring on the other. This design provides flexibility, allowing the throttling ring to be utilized when transporting fluid and the blind plate for cutting off the flow, similar to the function of a cut-off valve. The eight-character blind flange is widely chosen for systems requiring complete isolation due to its exceptional sealing performance.
Versatile Applications:
Eight-character blind flanges find application in various industries and sectors. Their main purpose is to ensure complete isolation, similar to a gate valve with a reliable performance rating of 100% and virtually no scope for misoperation. Here are some common applications where eight-character blind flanges are used effectively:
1. System Medium Pipes:
In systems with medium pipes such as steam purge or oil process pipes, the figure 8 blind plate plays a crucial role in secure isolation. The blind plate should be installed on the side near the system medium pipes. For online disassembly, a gate valve partition should be placed near the process medium pipeline, ensuring easy and safe access.
2. Flammable or Toxic Media Pipes:
Pipes carrying flammable or toxic media entering or exiting a device should be equipped with double gate valves. Additionally, installing a figure 8 blind plate on the double gate valve provides an extra layer of security. For such applications, figure 8 blind plates are often marked as “normally open” for quick identification.
3. Startup Procedures:
During the startup of a device, gate valves are installed on pipes that are no longer in direct contact with the medium after normal operation. The figure 8 blind plate is then installed on the side of the pipe where five media normally circulate. In this case, the figure 8 blind plate is generally marked as “normally closed,” ensuring proper operation and maintenance.
Choosing the Right Figure Eight Blind Plate:
Selecting the appropriate figure 8 blind plate requires attention to detail, particularly in terms of matching it with the flange holding it. The length of the bolts used for clamping should be adjusted according to the thickness of the blind plate to ensure a secure and effective installation.
Conclusion:
Eight-character blind flanges, also known as figure 8 blind plates, are versatile components that play a vital role in ensuring the integrity and efficiency of various piping systems. Their ability to provide secure isolation and reliable functionality makes them an ideal choice for systems that require complete separation. When selecting an eight-character blind flange, it is crucial to consider its application and appropriately match its specifications with the flange. By doing so, you can ensure a reliable and efficient solution that meets your specific requirements.
Post time: Mar-09-2024