ASME B16.48 Spectacle Blind Flange Manufacturer
Shribhairav Forge is a trusted ASME B16.48 Spectacle Blind Flange manufacturer in India, offering precision-engineered flange solutions that ensure safety, reliability, and long-lasting performance in industrial piping systems. Our spectacle blinds are designed and manufactured in compliance with international standards to meet the critical needs of oil & gas, petrochemical, power generation, and offshore industries
Shribhairav Forge is a leading ASME B16.48 Spectacle Blind Flange manufacturer, supplier, and exporter offering premium-quality products for industrial piping systems. Our spectacle blinds are precisely engineered to provide a safe and reliable method for isolating sections of pipelines during maintenance, inspection, or repair.
We manufacture Spectacle Blind Flanges (Figure-8 Blinds) in various materials, sizes, and pressure ratings that comply with international standards such as ASME B16.48, ANSI, DIN, ASTM, and API.
What are Spectacle Blind Flange?
A spectacle blind flange is a safety device used in piping systems to either isolate a section of the pipeline or allow flow through it. It consists of two metal discs attached side by side — one solid (the “blind”) and one with a hole (the “spacer”) — resembling a pair of eyeglasses, hence the name “spectacle.” This design allows operators to easily switch between open and closed positions by simply rotating the spectacle blind, providing a visual and physical indication of whether the line is open or blocked.
An ASME B16.48 Spectacle Blind Flange is a pair of metal discs—one solid (blind) and one open (spacer)—connected by a small section of metal. This design allows easy switching between open and closed positions in a pipeline system, making it ideal for maintenance, inspection, and flow isolation. Shribhairav Forge produces spectacle blinds in various materials, sizes, and pressure classes to match specific operational requirements.
Spectacle Blind Flange consists of two discs connected by a small web: Spade (Blind Plate):Used to completely stop the flow
Spacer (Ring Spacer): Used to allow the flow
Operators can easily rotate the spectacle blind to either block or open the flow without dismantling the pipeline, making it ideal for high-pressure and high-temperature applications.
Spectacle blinds are typically installed between two pipe flanges in systems where frequent maintenance or inspection is required. During normal operation, the open end of the spectacle blind (the ring) allows flow through the pipe. When it becomes necessary to isolate a section for maintenance, the blind end is rotated into position to block the flow completely. This simple yet effective mechanism ensures safety during repairs or shutdowns by preventing accidental flow of fluids or gases.
Manufactured from materials such as Stainless Steel, Carbon Steel, Alloy Steel, Boiler Quality Plates, spectacle blind flanges are designed to withstand high pressure and temperature conditions. They are commonly used in oil and gas, chemical processing, power plants, and refinery industries, where safety and reliability are critical. The use of spectacle blinds also helps operators comply with safety standards, as their visible position makes it easy to confirm whether a line is open or closed at a glance.
As a leading Spectacle Blind Flange Manufacturer, Shribhairav Forge ensures every product undergoes strict quality checks and dimensional accuracy testing. Our flanges are designed to provide leak-proof connections and excellent corrosion resistance under extreme pressure and temperature conditions.
Standard Specification For Spectacle Blind Flanges
Dimensions: Types and Dimensions of Spectacle Blind Flanges. Our spectacle blind flanges are manufactured in accordance with ASME B16.48, BS 4504, API 590, and DIN standards. MSS SP44, Custom Drawings Available Types: Raised Face (RF) Spectacle Blind Flange Flat Face (FF) Spectacle Blind Flange Ring Type Joint (RTJ) Spectacle Blind Flange Spade and Spacer Sets As per ASME B16.48 standard tables
Size Range: 1/2" (15 NB) to 48" (1200NB)
Pressure Classes: 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS, DIN Standard ND-6,10, 16, 25, 40 Etc.
DIN Standards: DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636,DIN2637, DIN2638, DIN2673
BS Standards: BS4504 , BS4504, BS1560, BS10
Flange Face Types: Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ)
ASME B16.48 Spectacle Blind Flange Manufacturer Shribhairav Forge.These specs are validated through our in-house hydrostatic testing (up to 1.5x rated pressure) and dimensional verification using CMM (Coordinate Measuring Machines). For 2025 updates, we've incorporated ASME's revised tolerances for high-temperature deviations, ensuring slip on flanges perform flawlessly in fluctuating environments.
| Specification | Class 150 | Class 300 | Class 600 | Notes |
|---|---|---|---|---|
|
Max Pressure (bar) |
19.6 |
51.7 |
103.4 |
At 38°C ambient |
|
Min Thickness (mm, 6″ size) |
9.5 |
14.3 |
22.2 |
Per B16.5 |
|
Bolt Circle Dia. (mm, 4″) |
114.3 |
152.4 |
190.5 |
8 holes standard |
|
Weight (kg, 4″ CS) |
1.6 |
2.3 |
4.1 |
Varies by material |
Material & Grades of Spectacle Blind Flanges
Material selection is the heart of any spectacle blind flange's performance, and at Shribhairav Forge, we source only prime materials from LME-registered suppliers. Our portfolio spans ferrous and non-ferrous alloys, optimized for corrosion resistance (PREN values up to 40+), weldability, and environmental resilience.
Stainless Steel Spacer and Spade Blind Flange Manufacturer in ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L
Duplex Steel Spectacle Blind Flange Manufacturer in Grades: Duplex 2205, Super Duplex 2507, UNS S31803, S32750 & ASTM / ASME A/SA 182 F 44, F 45, F51, F 53, F 55, F 60, F 61
Carbon Steel Spectacle Blind Flange Manufacturer in ASTM / ASME A/SA 105 ASTM / ASME A 350 , ASTM A 181 LF 2 / A516 Gr.70 A36, A694 F42, F46, F52, F60, F65, F706
LTCS Spectacle Blind Flange Manufacturer in ASTM A350, LF2, LF3
Alloy Steel Spectacle Blind Flange Manufacturer in ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91
ANSI B16.48 Spectacle Blind Flange Stainless Steel Spacer and Spade Blind Flange Application
ASME B16.48 Spectacle Blind Flanges are known to deliver exceptional performance and are generally developed for meeting the demands. We offer a broad range of Spectacle Blind Flanges through a worldwide network of stock-keeping branches. These Spectacle Blind Flange is use in various industries like :
- Stainless Steel Spectacle Blind Flanges uses in Oil and Gas Pipeline
- Spectacle Blind Flanges uses in Chemical Industry
- Alloy Steel Spectacle Blind Flanges uses in Plumbing
- Flat Faced Spectacle Blind Flanges uses in Heating
- DUPLEX STEEL ASME B16.48 Spectacle Blind Pipe Flange uses in Water Supply Systems
- ANSI B16.48 Spectacle Blind Forged Flanges uses in Power Plant
- Spectacle Blind Plate Flanges uses in Paper & Pulp Industry
- Spectacle Blind Flange uses in General Purpose Applications
FAQs
What is the difference between a Spectacle Blind and a Spade Flange?
As per ASME B16.48 Spectacle Blind Flange Standards, a Spectacle Blind Flange combines both a spade (solid plate) and a spacer (open ring) connected by a tie bar, allowing easy switching between flow and isolation. A Spade Flange is only the solid part used to block the flow, often supplied separately with a spacer for systems where there’s limited installation space. Shribhairav Forge is Stainless Steel Spacer and Spade Blind Flange Manufacturer in India.
What key factors create memorable customer experiences?
Memorable customer experiences are created by understanding customer needs, providing personalized interactions, ensuring prompt responses, and maintaining a positive, friendly attitude. Consistency in service quality and exceeding expectations are also essential for lasting impressions.
Which standard governs the dimensions of Spectacle Blind Flanges?
The dimensions, tolerances, and material requirements of Spectacle Blind Flanges are governed by ASME B16.48. It specifies sizes ranging from ½” to 24” for various pressure ratings up to Class 2500. Carbon Steel Spectacle Blind Flange Manufacturer is Shribhairav Forge. For more Details regardign Dimension kindly connect with us on Whatsapp or Email.
What sets your service apart from competitors?
Our service stands out through personalized attention, quick response times, and a commitment to continuous improvement making us the top ASME B16.48 Spectacle Blind Flange Manufacturer in Asia. At our Factory all Process is followed as per ASME B16.48 Guidlines from Raw Material Selection and Inspection til Final Inspection of Material. Be it Carbon Steel Spectacle Blind Flange, Stainless Steel Spectacle Blind Flange or Super Duplex Steel Spectacle Blind Flange or Cupro Nickel or Incoloy Spectacle Blind Flange all material are thoroughly inspected and tested. We prioritize customer satisfaction, consistently adapting to feedback and industry trends to deliver exceptional, tailored experiences.
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Trusted for Precision.
Delivered with Confidence.
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- sales@shribhairavforge.com
- +91 9969566209
- +91 22 6636 2333
- Plot 59, Dr M.G Marg, Mumbai - 400004, Maharashtra, India
- Shribhairav Metal Corporation