Spectacle Blind Flanges

Spectacle Blind Flanges

Vandan Alloys is a manufacturer, supplier, stockist and exporter of Spectacle Blind Flanges, also known as Spectacle Blinds, used for positive isolation of piping systems during maintenance, shutdown and process operations.

A spectacle blind consists of a solid blind section and an opening section connected by a common integral web. By rotating the assembly, the piping line can be changed between an open-flow position and a positively isolated position, subject to the system design and operating procedure.

Spectacle Blind Flange Specifications

Product: Spectacle Blind Flanges / Spectacle Blinds

Type: Spectacle Blind, Figure-8 Blind, Line Blind

Material: Stainless Steel, Carbon Steel, Alloy Steel, Duplex, Super Duplex, Nickel Alloys and other specified materials

Standards: ASME B16.48 and applicable project specifications

Pressure Classes: Class 150, 300, 600, 900, 1500 and 2500, subject to applicable size and standard

Size Range: 1/2“ to 24” and larger sizes as specified

Facing: RF, FF or RTJ configuration where applicable

Bore: Opening section manufactured to specified line dimensions

Drilling: Bolt-hole arrangement to match the mating flange specification

Inspection: Visual and dimensional inspection as required

Certificate: EN 10204 Type 3.1 MTC available

Customization: Special dimensions, thickness, bore, drilling, marking and material grades available

Spectacle Blind Material Grades

Vandan Alloys supplies Spectacle Blinds in various grades including:

Stainless Steel: 304, 304L, 316, 316L, 321, 347, 310, 310S and 904L

Carbon Steel: ASTM/ASME A105 and other specified carbon steel grades

Alloy Steel: F11, F22 and other specified alloy steel grades

Duplex Stainless Steel: 2205 / UNS S31803 / S32205

Super Duplex Stainless Steel: 2507 / UNS S32750 / S32760

Nickel Alloys: Nickel 200, Nickel 201, Monel 400, Inconel 625, Alloy 20, Hastelloy and other specified grades

Titanium: Grade 2, Grade 5 and other specified grades

Spectacle Blind Design

Spectacle Blinds provide a practical method of achieving positive mechanical isolation within a flanged piping system. The solid portion blocks the line, while the open portion allows normal flow when correctly positioned.

The overall dimensions, thickness, bore, bolt-hole pattern and facing must be selected to match the applicable standard, mating flanges and piping design.

Spectacle Blinds should only be repositioned under appropriate plant isolation and safety procedures.

Spectacle Blind Pressure Classes

Spectacle Blinds are available in applicable pressure classes including Class 150, 300, 600, 900, 1500 and 2500.

Availability depends on the required size, material and applicable dimensional standard. Pressure and temperature suitability should always be verified against the applicable piping specification.

Spectacle Blind Facing

Depending on the application and mating flange arrangement, Spectacle Blinds can be supplied with:

Raised Face (RF)

Flat Face (FF)

Ring Type Joint (RTJ), where applicable

The facing configuration should match the mating flange and gasket arrangement.

Spectacle Blind Applications

Spectacle Blinds are commonly used in:

Oil & Gas Pipelines

Refineries

Petrochemical Plants

Chemical Processing

Power Generation

Process Piping

Natural Gas Systems

Steam Lines

Maintenance Isolation

Plant Shutdown Applications

Pressure Equipment Connections

Industrial Piping Systems

Customized Spectacle Blinds

Vandan Alloys can supply Spectacle Blinds according to customer drawings, piping specifications and project requirements.

Customization can include special outside diameter, thickness, bore, bolt-hole drilling, PCD, facing, material grade, marking and other dimensional requirements.

Quality & Inspection

Spectacle Blinds can be inspected for outside diameter, thickness, bore/opening dimensions, bolt-hole size, PCD, facing, web dimensions and overall dimensional accuracy.

Material Test Certificates including EN 10204 Type 3.1 MTC can be supplied as required. Third-party inspection can also be arranged according to customer requirements.

Why Choose Vandan Alloys?

Spectacle Blind Manufacturer in India

Spectacle Blind Exporter in India

Spectacle Blind Supplier in India

Spectacle Blind Manufacturing Works in India

ASME B16.48 line blind solutions

Wide range of material grades

Class 150 to Class 2500 options where applicable

RF, FF and RTJ configurations where applicable

Customized dimensions available

Dimensional inspection before dispatch

EN 10204 Type 3.1 MTC available

Export-quality packaging

Worldwide supply from Mumbai, India

Get a Quote

For Spectacle Blind Flanges, send us your line size, material grade, pressure class, facing, bore, bolt-hole details, quantity and applicable standard or drawing.

Vandan Alloys supplies Spectacle Blinds for industrial piping isolation, maintenance and critical process applications, with focus on dimensional accuracy, material compliance and reliable export supply.

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SEO Title

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Meta Description

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