Figure 8 Blank Throttle Plate Double Sided Marine ASME B16.48 Spectacle Blind

Figure 8 Blank Throttle Plate Marine Spectacle Blind Nickel Alloy Flange

A Figure 8 blank, commonly known as a Spectacle Blind, is a safety device used in pipelines and other pressurized flows, deployed to isolate sections of a line. It is called "Figure 8" due to its shape, which resembles the number 8, with one side being a solid disk (blind) and the other a ring (spacer).

Design and Structure:

1. Double-Sided Design:

Blind End: One section is a solid disk used to stop flow and completely shut off the pipeline.

Spacer End: The other section is an open ring allowing the normal flow when the line does not need to be isolated.

2. Connecting Web: The two parts are connected by a handle, making it easy to switch between the blind and open positions.

Materials:

Nickel Alloys: Known for their excellent resistance to corrosion and high-temperature strength, typical nickel alloys used include:

• Inconel (Alloy 600, Alloy 625): Exceptional resistance to oxidation and corrosion.
• Monel (Alloy 400): Resistant to seawater and steam at high temperatures as well as salt and caustic solutions.
• Hastelloy (C-276, C-22): Outstanding resistance to a wide range of chemical processes.
• Nickel 200/201: Pure nickel with excellent mechanical properties and corrosion resistance.

Applications:

1. Oil and Gas Industry: Used in pipelines to isolate sections for maintenance or if there's a need to adjust flow paths.
2. Chemical Processing Plants: Essential for isolating segments of pipework carrying aggressive and corrosive chemicals.
3. Power Generation: Used in steam and gas systems to ensure safe and efficient flow isolation during operations and maintenance.
4. Marine and Aerospace: Employed in systems where high strength and corrosion resistance are critical.

Benefits:

1. Safety: Provides a reliable method of isolating pipeline sections, reducing the risk of spillage or accidents during maintenance.
2. Durability: Nickel alloys provide excellent durability and longevity in harsh environments.
3. Versatility: Can be used in a range of temperatures and pressures, making them suitable for various industrial applications.
4. Corrosion Resistance: High resistance to corrosion reduces the frequency of replacements and maintenance, thus lowering operational downtime.

Standards and Specifications:

1. ASME B16.48: Covers the dimensions and materials for line blanks, including Spectacle Blinds, for use in piping systems.
2. ISO 9001: Ensures that the manufacturing of these components meets international quality management standards.

Customization Options:

1. Size and Thickness: Can be tailor-made to fit specific pipeline dimensions and pressure requirements.
2. Surface Treatment: Can be coated or treated for enhanced resistance to certain environments.
3. Documentation: Material test reports, pressure test reports, and certificates of conformance can be provided as required.

This comprehensive overview should provide a clear understanding of the details concerning Nickel Alloy Figure 8 blanks (Spectacle Blinds) and their applications in various industries.

Hunan Dinghan New Material Technology Co.,Ltd. (DINGSCO) specialized in Nickel Based Corrosion Resistant and High Temperature alloys products which used in the world’s most technically demanding industries and applications.

We have complete advanced technology facilities to produce best quality alloys to meet exacting your specifications such as VIM (Vacuum lnduction Melting) furnace to provide high purity Alloys,ESR (Electro Slag Re-melting) furnace to enhances the structure and purity of the Alloys, and CNC machining equipments (Lathe, Wire cutting, Drilling,Milling) to provide high precision finished products.

We are dedicated to providing our customers with best quality products,fastest possible deliveries, most competitive prices of Nickel Based Corrosion Resistant and High Temperature alloys in bars,rods,forged flanges, valve parts, forged shapes (shafts, discs, blocks, hubs,rings, cylinders and tailor shapes) according to ASTM,ASME,API,AMS, NACE and other industry standards.

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