Latest Design Spectacle Blind Flange Asme B16.48

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To create additional worth for consumers is our enterprise philosophy; buyer growing is our working chase for Spectacle Blind Flange and Blind Flange, Due to our good solutions and services, we’ve got received good reputation and credibility from local and international customers. If you need to have more information and are interested in any of our products and solutions, you should feel free to contact us. We look forward to becoming your supplier in the near future.

ASME B16.48 spectacle blind Flange,Figure 8 Flanges,A182 F316L spectacle blind Flange

The 8-shaped blind plate is a kind of pipe parts, mainly for the convenience of inspection and repair. You can know the specific shape by painting the upper part of the “8″ black. It is half a blind plate and half an iron ring. It is commonly used for pipeline flanges that need to change the process. The materials are mainly carbon steel, stainless steel, alloy, and can be selected according to the pipeline pressure level and the pipeline medium. We can manufacture Spectacle Blind Flange with different type of joint face (RF, FF, RTJ) in series 150/300/600/900/1500/2500 in according to major dimensional standards ASME B16.48. Spectacle blind Flange ,also known as figure 8 Flange which is combination of the two that can be rotated to function as Single Bind or a Ring Spacer. This kind of flange is generally a piece of metal than is cut to fit between two pipe flanges and usually sandwiched between two gaskets a spectacle blind is often made from two metal discs that are attached to each other by a small section of steel. The Sharp is similar to a pair of glasses or spectacles – hence the name spectacle blind flange. One end of the blind will have an opening to allow flow through the pipe during operation and the other end is solid to block flow during maintenance. They are generally installed as a permanent device to separate process piping system. The whole idea of a spectacle blind Flange is so that one can be absolutely sure that an item of equipment is properly and securely blanked off with no possibility of any flow or leakage through a valve during maintenance. The flow can be diverted to other items of equipment but not just by passed around the blank as this would compromise the safety function of the spectacle blind. The flow has to valve off and pressure relieved prior to loosening flange bolts and swinging the blind.

Flange Types

Weld Neck This flange is circumferentially welded into the system at its neck which means that the integrity of the butt welded area can be easily examined by radiography. The bores of both pipe and flange match, which reduces turbulence and erosion inside the pipeline. The weld neck is therefore favoured in critical applications erosion inside the pipeline. The weld neck is therefore favoured in critical applications. Slip-on This flange is slipped over the pipe and then fillet welded. Slip-on flanges are easy to use in fabricated applications. Blind This flange is used to blank off pipelines, valves and pumps, it can also be used as an inspection cover. It is sometimes referred to as a blanking flange. Socket Weld This flange is counter bored to accept the pipe before being fillet welded. The bore of the pipe and flange are both the same therefore giving good flow characteristics. Threaded This flange is referred to as either threaded or screwed. It is used to connect other threaded components in low pressure, non-critical applications. No welding is required. Lap Joint These flanges are always used with either a stub end or taft which is butt welded to the pipe with the flange loose behind it. This means the stub end or taft always makes the face. The lap joint is favoured in low pressure applications because it is easily assembled and aligned. To reduce cost these flanges can be supplied without a hub and/or in treated, coated carbon steel. Ring Type Joint This is a method of ensuring leak proof flange connection at high pressures. A metal ring is compressed into a hexagonal groove on the face of the flange to make the seal. This jointing method can be employed on Weld Neck, Slip-on and Blind Flanges. ASME B16.48 is a blind flange standard developed by the American Society of Mechanical Engineers (ASME), suitable for various types of piping systems. Among them, the spectacle blind flange in ASME B16.48 is a special type of blind flange.
Introduction to spectacle blind flange
The spectacle blind flange, also called octagon blind flange, is composed of two octagon blind flanges, which are fastened together by bolts and gaskets in the middle. It differs from other types of blind flanges in that it can provide higher pressure resistance and sealing performance, suitable for various high-pressure gas and liquid medium pipeline systems.
Size and pressure rating
According to ASME B16.48 standard, the size range of the spectacle blind flange is from 1/2 inch to 144 inch, and the pressure rating can reach Class 150 (PN20), Class 300 (PN50), Class 600 (PN100), and Class 900 (PN150).
Application scope
ASME B16.48 spectacle blind flanges are widely used in pipeline systems in industries such as chemical, petroleum, natural gas, food processing, and pharmaceuticals. In general, they are used for the following purposes:
Pipeline maintenance and repair
Block the end or branch of the pipeline
Prevent leakage and pollution
Advantages and disadvantages
The advantages of ASME B16.48 spectacle blind flange include:
Strong pressure resistance: Compared to other types of blind flanges, the spectacle blind flange can provide higher pressure resistance and is suitable for various high-pressure gas and liquid pipeline systems.
Good sealing performance: because it is composed of two octagon blind plates, which are fastened together by bolts and gaskets in the middle, the spectacle blind flange has good sealing performance, which can effectively prevent leakage and pollution.
However, ASME B16.48 spectacle blind flanges also have some drawbacks:
High cost: Compared to other types of blind flanges, the cost of spectacle blind flanges is relatively higher.
Installation and maintenance are relatively complex: the installation and maintenance of the spectacle blind flange require more tools and labor, which is relatively complex.
Overall, ASME B16.48 spectacle blind flange is a high-performance blind flange suitable for various high-pressure gas and liquid pipeline systems, with advantages such as good pressure resistance and sealing performance.

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2.Trial orders are acceptable.
3.Flexible and convenient logistic service.
4.Competitive price.
5.100% testing,ensuring the mechanical properties
6.Professional testing.

1.We can guarantee the best material according to related quotation.
2.Testing is performed on each fitting before delivery.
3.All packages are adapt for shipment .
4. Material chemical composition is conformed with international standard and environment standard.

A) How can I get more details about your products?
You can send an email to our email address. We will provide catalogue and pictures of our products for your reference.We can also supply pipe fittings, bolt and nut, gaskets etc. We aim to be your piping system solution provider. 

B) How can I get some samples?   
If you need, we will offer you samples for free, but new customers are expected to pay express charge. 

C) Do you provide customized parts? 
Yes, you can give us drawings and we will manufacture accordingly. 

D) To which country have you supplied your products?
We have supplied to Thailand, China Taiwan, Vietnam, India, South Africa, Sudan, Peru , Brazil, Trinidad and Tobago, Kuwait, Qatar, Sri Lanka, Pakistan, Romania, France, Spain, Germany, Belgium, Ukraine etc. (Figures here only include our customers in latest 5 years.). 

E) I can’t see the goods or touch the goods, how can I deal with the risk involved?  
Our quality management system conforms to the requirement of ISO 9001:2015 verified by DNV. We are absolutely worth your trust. We can accept trial order to enhance mutual trust.