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Valour Alloys Inc., we carry a full inventory and Supply Spectacle Blind Flanges products in a variety of sizes widely used for marine applications due to their excellent resistance to seawater corrosion, low macrofouling rates, and good fabricability.
A Spectacle Blind Flange is a special type of flange that consists of two metal discs attached to each other by a section of metal, resembling a pair of glasses or a "spectacle." These flanges are primarily used in piping systems to temporarily or permanently block off a section of a pipeline or to facilitate easy cleaning, inspection, or modification of the pipeline.

Spectacle Blind Flanges Manufacturer

Spectacle Blind Flanges Exporter
Manufacturer and Exporter of Spectacle Blind Flanges in Dimension accordance with ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092-1, DIN, etc. Certified with NACE, PWHT, HIC, SSC, Magnetic Particle Test, Dye Penereteration Test etc.
Design and Structure: Spectacle Blind Flanges typically have one solid metal disc and one with a circular opening, and they are hinged together. The solid disc completely blocks the flow, while the disc with an opening allows flow when aligned with the pipeline.
Purpose: The main purpose of Spectacle Blind Flanges is to isolate or shut off sections of a pipeline for maintenance, repair, or inspection purposes. They are often used in systems where regular shutdowns are required for cleaning or modification.
Material: Like other flanges, Spectacle Blind Flanges are manufactured in various materials, with carbon steel, stainless steel, and alloy steel being common choices. The material selection depends on factors such as the nature of the fluid, pressure, and temperature of the system.
Pressure Ratings: Spectacle Blind Flanges are designed to withstand specific pressure ratings, and it's crucial to select a flange with the appropriate pressure class for the intended application.
Sizes and Dimensions: These flanges come in various sizes and dimensions to accommodate different pipeline requirements. Standard dimensions and sizes are defined by industry standards, such as ASME B16.5 and ASME B16.48.
Installation and Alignment: During normal operation, the blind side of the Spectacle Blind Flange is bolted in place, blocking the flow. When maintenance or modification is required, the bolts are removed, and the hinge allows the blind to swing open, aligning the opening with the pipeline for flow.
Common Industries: Spectacle Blind Flanges find applications in industries such as petrochemical, oil and gas, chemical processing, and power generation, where regular maintenance and inspections are essential for safe and efficient operation.
Standards and Codes: The design, manufacturing, and usage of Spectacle Blind Flanges are governed by industry standards and codes, such as those provided by the American Society of Mechanical Engineers (ASME) and other relevant organizations.
Spectacle Blind Flanges offer a practical solution for pipeline isolation and maintenance, providing a means to easily and temporarily block or allow fluid flow in a piping system.
Spectacle Blind Flanges Range
Flanges Specification | ASTM B151 / ASME SB151 |
Flanges Manufacturing Process | Hot Forging / Rolling / Machining |
Flanges Other Grades | Copper Nickel Cu-Ni 70 / |
Flanges Outer Diameter | 1/2" NB TO 64" NB |
Flanges Pressure Class | Class 150#, Class 300#, Class 400#, Class 600#, Class 900#, Class 1500#, Class 2500# or As Per Custom Requirement PN 6, PN 10, PN 16, PN 25 and PN 40 etc |
Flanges Schedule | Sch 10s TO Sch XXS or As Per Custom Requirement |
Flanges Facing | Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ) |
Flanges Dimension | ASME B16.5, ASME B16.47 SERIES A, ASME B16.47 SERIES B, ASME B16.36, BS10, EN1092-1:2013, MSS SP44, ASA, API-605, ISO 7005, ISO 15590-3, DIN 2631--2638, DIN 2573-2576, DIN 2527, DIn 2641-2642, DIN 2565-2566, DIN2502, AWWA, AS2129 TABLE C, D, E, F, J etc.. |
Flanges Types | Welding Neck Flange, Slip On Flange, Socket Weld Flange, Lap Joint Flange, Threaded Flange, Blind Flange, Orifice Flanges, Plate Flange, Long Welding Neck Flanges, Long Radius Elbow Weldoflange, Nipoflange, Expander Flange, Reducing Flange, WNRF Flange, SORF Flange, SWRF Flange, Custom Flange as per Drawing etc. |
Flanges Other Testing | NACE MR0175, Ultrasoung TEST, IGC TEST, Intergranular Corrrosion Test as per ASTM A262 Practice E, Charpy Impact Test, Macro, Grain Size, Hardness, HIC, SSC, Sour Service etc. |
Flanges Value Added Services | Rolling, Drill, Punch, CNC Machining, Sand Blasting, Shot Blasting, Heat Treatment, Anti-rust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized |
Flanges Packaging | Loose / Carrate / Wooden Pallet / Wooden Box / Plastic Cloth Wraps |
Flanges Shipment & Transportation | By Road - Truck / Train Partial Load, Full Load, By Sea - Break-bulk Conventional Vessel / Pressure Vessel / FCL (Full Container Load) / LCL (Less Container Load) / 20 Feet Container / 40 Feet Container / 45 Feet Container / High Cube Container / Open Top Container, By Air - Freighter Civil Passenger and Cargo Planes |
Flanges Material Test Certificate | Manufacturer Test Certificate As Per EN10204 3.1, 3.2 / Laboratory Test Certificate From NABL Approved Lab. / Under Third Party Inspection Agency Like SGS, TUV, DNV, LLOYDS, ABS, Bureau of Indian Standards BIS Approved ETC |
Other Types of Flanges
Spectacle Blind Flanges Flanges
Stainless Steel Spectacle Blind Flanges | Duplex Steel Spectacle Blind Flanges |
Super Duplex Steel Spectacle Blind Flanges | Carbon Steel Spectacle Blind Flanges |
Alloy & Chrome Moly Spectacle Blind Flanges | Inconel Alloy Spectacle Blind Flanges |
Incoloy Alloy Spectacle Blind Flanges | Monel Alloy Spectacle Blind Flanges |
Hastelloy Alloy Spectacle Blind Flanges | Nickel Alloy Spectacle Blind Flanges |
Titanium Spectacle Blind Flanges | Aluminium Spectacle Blind Flanges |
Copper Alloy Spectacle Blind Flanges | Alloy 20 Spectacle Blind Flanges |
What is a Spectacle Blind Flange?
A spectacle flange is a type of flange composed of two metal discs joined in the centre by a small segment of steel. Spectable flanges acquire their name from their appearance, which resembles a pair of reading glasses or spectacles. Spectacle flanges, also known as spectacle blind flanges, are most usually employed on piping systems that must be divided on a regular basis or where the flow through the systems is frequently interrupted. One end of the spectacle flange is solid, and the other has a hole in the centre. The spectacle flange may be rotated to insert either the solid or hollow end into the pipe system, opening or closing the flow.
Where to Use
Spectacle blind flanges should be used in systems that frequently need to be segregated from other installations. Normally, a Spectacle blind flange is set in the "open" position to allow flow through the pipe. If the Spectacle Blind is turned to the "close" position, the pipe is blanked out, and no flow is possible.
Maintenance on a pipe system may require the temporary replacement of a Ring Spacer flange with a Spade flange. The Spade or Spacer can be installed after loosening all bolts and temporarily removing half of them. After replacing the gaskets, the bolts can be reassembled and tightened. Before releasing the flange bolts, ensure that the pipeline is valved off and pressure alleviated.
To reduce additional weight to a flange connections,designer typically will pick the seperated two components (spacer flange and spade flange) instead of the spectacle blind flange.
Spectacle Blind Flanges Application
- Oil and Gas equipments
- Offshore Technology
- Seawater Desalination Plants
- Chemical Industry
- Airport, Malls, Buildings
- Storage Tanks
- Medical Industry
- Civil Engineering
- Pressure vessels, Reactor tanks, and Heat exchangers
- Rotors, impellers and shafts
- Power Plants
- Petrochemical
- Shipbuilding Industry
- Mining Industry
- Food Equipments Industry
Test Certificates
We Spectacle Blind Flanges with the following details Mill Test Certificate according to EN 10204 3.1, PMI Test, Test Report from NABL Approved Lab, 3.2 Certification by External Testing Authority third, ultrasonic test report, and X-ray report.
Quality Assurance
At Spectacle Blind Flanges all types of raw material purchase to production and product shipping. They are visually inspected for compliance with ASTM, ASME, DIN, EN and JIS codes and standards. We can also designate certified official testing agencies upon customer request so that they can witness the product's material, size and quality compliance reports.
Marking & Packing
Our Spectacle Blind Flanges is packaged to ensure no damage during transit. In the case of export, the standard export packing is in a wooden box. All Spectacle Blind Flanges are marked with our grade, batch number, size and mark. We can also do custom branding on our products as per buyer's unique requirements
Supplying Spectacle Blind Flanges to Countries -
We Export Spectacle Blind Flanges to Saudi Arabia, Iran, Iraq, United Arab Emirates, Qatar, Bahrain, Oman, Kuwait, Turkey, Egypt, Yemen, Syria, Israel, Jordan, Cyprus, Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan, Sri Lanka, Maldives, Bangladesh, Mayanmar, Taiwan, Cambodia, Argentina, Bolivia, Brazil, Chile, Venezuela, Colombia, Ecuador, Guyana, Paraguay, Uruguay, United States of America, Canada, Mexico, Panama, Costa Rica, Puerto Rica, Trinidad And Tobago, Jamaica, Bahamas, Denmark, Russia, Norway, Germany, France, Italy, United Kingdom, Spain, Ukraine, Netherland, Belgium, Greece, Czech Republic, Portugal, Hungary, Albania, Austria, Switzerland, Slovakia, Finland, Ireland, Croatia, Slovenia, Malta, Nigeria, Algeria, Angola, South Africa, Libya, Egypt, Sudan, Equatorial Guinea, The Republic Of Congo, Gabon, Europe, Africa, Asia, North America, South America, Middle East, Far East Etc.
Distributing Spectacle Blind Flanges to Cities -
We Export Spectacle Blind Flanges to Navi Mumbai, Indore, Baroda, Muscat, Secunderabad, Gimhae-si, Kanpur, Colombo, Kuala Lumpur, Bhopal, Pimpri-Chinchwad, Rajkot, Haryana, Hanoi, Ernakulam, Chandigarh, Surat, Los Angeles, Hong Kong, Ahmedabad, Perth, Petaling Jaya, Hyderabad, Mumbai, Algiers, Edmonton, Ludhiana, Ho Chi Minh City, Karachi, Bangkok, Dallas, Bengaluru, Jakarta, Granada, Seoul, Cairo, Geoje-si, Rio de Janeiro, Abu Dhabi, Port-of-Spain, Sydney, London, Courbevoie, Vung Tau, Sharjah, Jaipur, Lahore, Chennai, Istanbul, Lagos, Thane, Dubai, Coimbatore, La Victoria, Calgary, Jeddah, Busan, Mexico City, Al Khobar, Caracas, Singapore, Atyrau, Manama, Kolkata, Riyadh, Jamshedpur, Brisbane, Toronto, Noida, Ahvaz, Vadodara, Doha, Visakhapatnam, Ulsan, New Delhi, Gurgaon, Bogota, Howrah, Moscow, Nashik, Ranchi, Nagpur, Al Jubail, Houston, Milan, Chiyoda, Aberdeen, Melbourne, New York, Dammam, Montreal, Santiago, Kuwait City, Pune, Tehran, Thiruvananthapuram, Faridabad, Madrid, Ankara Etc.