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Quick Switch Visual Status Spectacle blind flange ASMEB16.5 Class150

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:

Parameter	Details & Examples
Pressure Ratings (PN)	Common ratings include PN 10 and PN 16 .
Size Range	Available in a wide range of diameters to match pipeline dimensions, with specific size series defined in standards like GB/T 4450-1995 for marine use .
Materials	Typically made from materials matching the connected pipeline, including carbon steel, alloy steel, and stainless steel .
Standards	Conforms to various national and industry standards such as GB/T (China), DIN (Germany, e.g., DIN 86042), and JB/T (China Machinery Standard) .
Temperature Range	Operating temperatures vary by standard; for example, spectacle blinds per DIN 86042 are used up to 120 °C .

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

place of origin

Hebei, China

model number

DN15-DN2000

brand name

CODY

Type

blind flange

Size

1/2"-120"

Material

ST20 A105 304 316 321

Pressure

PN6 PN10 PN16 PN25

Flange standard

ASME B16.48

Packing

Wooden Case

Face

Technics

Forged or plate

Connection mode

welding

Application scenario

Water supply and drainage

FAQ

1.How can I get your quotation as soon as possible?
The email will be checked in 24 hours, meanwhile, the whatsapp will be online in 24 hours. Please tell us the order
information about quantity, specification(steel type, material, size )and destination port, you will get the latest price.

2.Do you accept product customization?
Yes, we can accept material customization, specification model customization, drawing customization, packaging customization.
3.How about the delivery time?
Normally in 5-7 days, the detail will be confirmed by the quantity and the different products. Of course, we will make the
delivery as soon as possible with the guarantee quality.
4.Can you print our logo or company name?
Yes, we can print or insert your logo or company's name if the order is based on our MOQ for OEM or ODM arrangement.
5.What is the warranty on your products?
One year. However, our products can typically last many years, even decades when installed properly, protected and use in the right working environment that they have been designed for.

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Categories	Alloy Steel Flanges
Brand Name:	TOBO
Model Number:	Alloy Steel Flanges
Certification:	ISO/TUV/SGS
Place of Origin:	Shanghai, China
MOQ:	1 pcs
Price:	Negotiation
Payment Terms:	MoneyGram, MoneyGram, Western Union, T/T, D/A, L/C, D/P
Supply Ability:	10000Pcs/month
Delivery Time:	15-25days
Packaging Details:	the wooden case