Quick Switch Visual Status Spectacle blind flange ASMEB16.5 Class150

1.Product Description

A Spectacle Blind Flange, also known as a Spectacle Blind or *Figure-8 Blind* due to its distinctive shape resembling the number "8", is a vital safety component used in piping systems . It consists of two interconnected metal discs:

• One is a solid blind end (a completely closed disc).

• The other is a throttling ring end (a ring with an opening the same diameter as the pipe bore) .

This unique design integrates both a blind flange and a spacer ring into a single unit. Its primary function is to provide a reliable and visible method for isolating sections of a pipeline . By rotating the spectacle blind, operators can easily switch the pipeline between an open state (allowing flow through the ring end) and a closed state (completely blocking flow with the solid end) . This makes it an essential device for maintenance, safety, and system configuration.

2.Key Product Parameters

The design and manufacturing of spectacle blind flanges adhere to various international standards. Key parameters include:

3.Product Applications

Spectacle blind flanges are critical for safety and operational flexibility in numerous industries:

Isolation for Maintenance and Safety: They provide a secure and visible barrier to temporarily or permanently isolate a section of a pipeline . This allows for safe inspection, cleaning, or repair of downstream equipment like valves, pumps, and vessels without draining the entire system. Their robust sealing performance and unmistakable appearance make them a highly reliable isolation method .

Easy Operation Switching: The primary advantage is the quick and clear changeover between operational states . When the ring end is in place, the system operates normally. When isolation is needed, the solid blind end is rotated into position. The distinct shape provides an immediate visual confirmation of the system's status—open or closed—from a distance, preventing operational errors . This is crucial in complex industrial plants where multiple pipelines exist.

Wide Industry Use: They are versatile components found in:

Shipbuilding: Used in various shipboard systems .Petrochemical & Oil Refining: Essential for isolating sections of process lines during turnaround or emergency shutdowns .Power Generation: Used to isolate sections in boiler and steam systems to prevent leaks and ensure safety during upkeep.

I hope this overview provides a clear understanding of spectacle blind flanges. Should you have more specific questions regarding a particular standard or application, feel free to ask.

Spectacle blind flange