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Product Overview
A Spectacle Blind Flange is a pipeline isolation fitting used to safely stop or restore the flow of fluids in piping systems. It consists of two discs joined by a metal section—one solid disc (blind) that completely blocks the pipeline and one open ring (spacer) that allows unrestricted flow. By rotating the fitting, operators can quickly change the pipeline from an open to a closed position.
At Moksh Tubes & Fittings LLP, we manufacture precision-engineered Spectacle Blind Flanges using high-quality forged materials and advanced CNC machining technology. Designed to withstand high pressure, high temperature, and corrosive environments, our spectacle blinds are widely used in critical industrial piping systems where safe isolation is essential.
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Specifications
| Specification | Details |
|---|---|
| Product | Spectacle Blind Flange |
| Standards | ASME B16.48, ASME B16.5, API, DIN, EN |
| Material | Stainless Steel, Carbon Steel, Alloy Steel, Duplex, Super Duplex, Nickel Alloys & Titanium |
| Size Range | ½" NB to 60" NB |
| Pressure Class | Class 150, 300, 600, 900, 1500 & 2500 |
| Facing Type | Raised Face (RF), Ring Type Joint (RTJ) & Flat Face (FF) |
| Type | Spectacle Blind / Figure-8 Blind |
| Surface Finish | Machined, Pickled, Polished or Anti-Rust Coated |
| Manufacturing | Forged & CNC Machined |
Size & Weight Chart
Spectacle Blind Flanges are manufactured in accordance with ASME B16.48 and are available in a wide range of nominal pipe sizes, pressure classes, and facing types.
| Nominal Pipe Size (NB) | Pressure Class | Outside Diameter (mm) | Thickness (mm) | Approx. Weight (kg) |
|---|---|---|---|---|
| ½" | 150 | 90 | 12 | 0.80 |
| ¾" | 150 | 100 | 14 | 1.00 |
| 1" | 150 | 108 | 16 | 1.40 |
| 1½" | 150 | 127 | 18 | 2.20 |
| 2" | 150 | 152 | 20 | 3.40 |
| 3" | 150 | 191 | 24 | 6.20 |
| 4" | 150 | 229 | 26 | 9.50 |
| 6" | 150 | 279 | 30 | 16.80 |
| 8" | 150 | 343 | 34 | 27.50 |
| 10" | 150 | 406 | 38 | 41.80 |
| 12" | 150 | 483 | 42 | 60.50 |
| 16" | 150 | 597 | 48 | 101.80 |
| 20" | 150 | 711 | 54 | 165.40 |
| 24" | 150 | 813 | 60 | 245.00 |
Note: Dimensions and weights are approximate and may vary depending on the pressure class (Class 150–2500), facing type (RF, RTJ, FF), material grade, and ASME B16.48 requirements. Custom sizes and pressure ratings are available upon request.
Grades & Equivalent
Stainless Steel Grades
304 / 304L, 316 / 316L
Carbon & Alloy Steel
Carbon Steel ASTM A105, LF2
Alloy Steel ASTM A182
F11/F22/F91
Duplex & Super Duplex
UNS S31803 / S32205
UNS S32750 / S32760
High-Performance Alloys
Inconel®, Monel®, Hastelloy®, Titanium Grade 2
Applications
Spectacle Blind Flanges are widely used in:
Oil & Gas Pipelines
Petrochemical Plants
Chemical Processing Industries
Refineries
Power Generation Plants
LNG & Natural Gas Facilities
Offshore & Marine Applications
Water & Wastewater Treatment
Industrial Process Piping
Features & Advantages
Safe and reliable pipeline isolation
Easy switching between open and closed flow
Ideal for maintenance and inspection work
Excellent corrosion and oxidation resistance
High mechanical strength and durability
Suitable for high-pressure and high-temperature applications
Precision-machined sealing surfaces
Long service life with minimal maintenance
Manufactured according to international quality standards
Mechanical Properties
The mechanical properties of Spectacle Blind Flanges depend on the selected material grade and comply with applicable ASTM and ASME standards. The table below represents the typical mechanical properties for commonly supplied stainless steel grades.
| Property | SS 304 / 304L | SS 316 / 316L |
|---|---|---|
| Tensile Strength (MPa) | 515 Min | 515 Min |
| Yield Strength (MPa) | 205 Min | 205 Min |
| Elongation (%) | 40 Min | 40 Min |
| Hardness (HB Max) | 201 | 217 |
Note: Mechanical properties for Carbon Steel, Alloy Steel, Duplex, Super Duplex, Nickel Alloy, and Titanium Spectacle Blind Flanges are available in accordance with their respective ASTM/ASME material specifications upon request.
Why Choose Moksh Tubes & Fittings LLP?
Leading Manufacturer, Supplier & Exporter
Premium Quality Forged Pipeline Isolation Products
Wide Range of Sizes, Pressure Classes & Material Grades
Ready Stock for Immediate Dispatch
Competitive Pricing
Strict Quality Assurance
Global Export Experience
Complete Documentation Support
Expert Technical Assistance
Frequently Asked Questions (FAQ)
What is a Spectacle Blind Flange?
A Spectacle Blind Flange is a pipeline isolation device consisting of a solid blind and an open spacer connected together, allowing pipelines to be easily opened or closed for maintenance and operational safety.
Where are Spectacle Blind Flanges used?
They are commonly used in oil & gas, petrochemical, refineries, power plants, LNG facilities, offshore platforms, and other industrial piping systems requiring safe pipeline isolation.
Which materials are available?
We manufacture Spectacle Blind Flanges in stainless steel, carbon steel, alloy steel, duplex, super duplex, nickel alloys, and titanium grades.
Do you provide material test certificates?
Yes. EN 10204 3.1 Material Test Certificates are supplied with every order.
Can you manufacture custom sizes and pressure classes?
Yes. We manufacture Spectacle Blind Flanges in standard and customized sizes, pressure classes, and material grades according to customer specifications.
Request a Quote
Looking for a trusted Spectacle Blind Flanges manufacturer and supplier? Contact Moksh Tubes & Fittings LLP for premium-quality pipeline isolation flanges, competitive pricing, ready stock, technical support, and fast worldwide delivery. Request your free quotation today.
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