Spectacle Blinds / Spade and Spacer Sets

Product Overview

Spectacle Blinds / Spade and Spacer Sets Stockist & Supplier in India

Spectacle Blinds / Spade and Spacer Sets are positive isolation devices used in piping systems to physically block or permit the flow of process media. As a reliable Spectacle Blinds / Spade and Spacer Sets Stockist in India and Supplier in India, we supply these components in different materials, sizes, pressure ratings, and thicknesses for industrial process piping.

These components are commonly installed between pipe flanges where reliable mechanical isolation is required during maintenance, inspection, testing, or equipment shutdown.

With an established presence since 1985 and ISO 9001:2015, ISO 14001:2015 and ISO 45001:2018 certifications, Metal-Link supports spectacle blind, spade and spacer requirements with material traceability, inspection documentation and project-based supply.

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Datasheet

Spectacle Blind / Spade and Spacer Set Specifications

Product Range

Types of Spectacle Blinds, Spades and Spacers

As an experienced Spectacle Blinds / Spade and Spacer Sets Supplier in India, we supply a complete range of positive isolation components for process piping, pipeline systems, and industrial equipment in various materials, sizes, and pressure ratings.

Spectacle Blind

Combined Isolation and Flow Position

A Spectacle Blind consists of a solid blind section and an open spacer section connected by a central web. The assembly resembles a pair of spectacles, which gives the component its name.

The solid portion is positioned between the flanges when complete isolation is required, while the open portion allows unrestricted pipeline flow. Its visible position helps operators identify the isolation status of the line.

Typical applications include:

• ✓Process piping isolation during maintenance
• ✓Equipment shutdown and safe isolation
• ✓Pressure testing of piping sections
• ✓Visual confirmation of line isolation status

Spade

Positive Mechanical Isolation

A Spade, also known as a paddle blind, is a solid metal plate inserted between two flanges to completely stop the flow of fluid.

Spades are commonly used when equipment requires:

• ✓Maintenance or inspection
• ✓Pressure testing
• ✓Safe shutdown
• ✓Mechanical isolation
• ✓Process separation

The required spade thickness is selected based on the applicable pressure rating, temperature, material, and piping design requirements.

Spacer

Maintaining Pipeline Flow

A Spacer is an open ring installed between flanges when the pipeline needs to remain in service. It generally corresponds to the dimensional requirements of the associated spade, allowing the two components to be interchanged while maintaining the flange assembly.

Spade and spacer combinations are particularly useful where positive isolation is required periodically but continuous removal of piping components is undesirable.

Spade and Spacer Set

Interchangeable Pipeline Isolation Solution

A Spade and Spacer Set consists of a separate solid spade and matching open spacer ring that can be interchanged between the same flange pair. This arrangement provides flexible isolation management without requiring changes to the piping system structure.

Paddle Blind

Complete Line Isolation

A Paddle Blind is a solid plate inserted between flanges to provide complete mechanical isolation of the pipeline. It is commonly used in refineries, petrochemical plants, and process facilities during turnarounds, maintenance shutdowns, and equipment isolation operations.

Custom Spectacle Blind

Project-Specific Isolation Design

Custom spectacle blinds are manufactured according to approved project drawings and engineering specifications. Dimensions including outside diameter, thickness, bore, handle configuration, and pressure rating can be designed to meet non-standard pipe sizes or special project requirements.

Material Grades

Common Materials for Spectacle Blinds / Spade and Spacer Sets

Material selection should be compatible with the piping system, process medium, operating temperature, pressure conditions, and corrosion requirements.

Design Data

Key Design Parameters

When selecting a Spectacle Blind, Spade or Spacer, the following design information is important to ensure correct fit, pressure rating, and material compatibility with the existing piping system.

Standards & Compliance

Standards and Specifications

Spectacle Blinds, Spades and Spacers are commonly manufactured according to applicable piping and flange standards. Custom components can also be manufactured according to project drawings, non-standard dimensions, or specific engineering requirements.

Project specifications and engineering calculations govern thickness, material, and testing requirements for spectacle blinds and spade sets used in critical service piping systems.

Industry Use

Applications of Spectacle Blinds / Spade and Spacer Sets

Spectacle Blinds, Spades and Spacers are widely used in process and industrial piping systems where positive mechanical isolation is required for safety, maintenance, testing, or operational control.

• ✓Oil and Gas Plants:
  Positive isolation of process lines during maintenance, equipment inspection, and safe shutdown operations in production and processing facilities.
• ✓Petroleum Refineries:
  Line blinding during turnaround maintenance and unit shutdowns where positive isolation of process streams is a safety requirement.
• ✓Petrochemical Facilities:
  Isolation of reactor feeds, product streams, and utility connections during planned and unplanned shutdowns.
• ✓Chemical Processing Plants:
  Positive mechanical isolation of corrosive and hazardous process streams using compatible material blinds.
• ✓Power Generation Systems:
  Steam and utility pipeline isolation during boiler maintenance, turbine inspection, and equipment servicing.
• ✓Offshore Platforms:
  Isolation of subsea and topside process lines in offshore oil and gas production and processing systems.
• ✓Water Treatment Facilities:
  Isolation of water supply, treatment, and distribution pipelines during filter maintenance and system upgrades.
• ✓Steam and Utility Pipelines:
  Isolation of steam, condensate, and utility connections during plant maintenance and equipment replacement.
• ✓Process Equipment Isolation:
  Isolation of pumps, compressors, heat exchangers, and vessels during maintenance and hydrostatic pressure testing operations.

Certification

Testing, Inspection & Quality of Spectacle Blinds / Spade and Spacer Sets

As a dependable Spectacle Blinds / Spade and Spacer Sets Supplier in India, products can be supplied with inspection and testing according to applicable specifications and project requirements. Available testing may include:

• ✓Chemical composition analysis
• ✓Mechanical testing where applicable
• ✓Positive Material Identification (PMI)
• ✓Dimensional inspection
• ✓Visual examination
• ✓Liquid penetrant testing where required
• ✓Magnetic particle testing where applicable
• ✓Ultrasonic testing where specified
• ✓Hardness testing
• ✓Radiographic testing where specified

With an established presence since 1985 and ISO 9001:2015, ISO 14001:2015 and ISO 45001:2018 certifications, Metal-Link supports consistent product quality. Documentation may include Material Test Certificates, PMI reports, dimensional inspection reports, non-destructive testing reports, mechanical test results, and third-party inspection certificates.

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Pan-India Supply

Spectacle Blinds / Spade and Spacer Sets Supplier & Stockist Across India

Metal-Link Steel & Alloys supplies Spectacle Blinds, Spades and Spacer Sets to EPC contractors, engineering companies, refineries, petrochemical plants, chemical processing facilities, power plants, fabricators, distributors and industrial buyers across major Indian markets. As a Spectacle Blinds / Spade and Spacer Sets Supplier in India, Metal-Link supports standard and project-specific requirements based on type, pipe size, flange standard, pressure class, material, and quantity.

Cities We Supply

Have Questions?

Frequently Asked Questions

What is a Spectacle Blind used for?

A Spectacle Blind is used to provide positive mechanical isolation of a pipeline or process equipment. It consists of a solid blind section and an open ring section connected by a web. The solid section is positioned between flanges to block flow during maintenance or shutdown, while the open section allows normal pipeline flow during operation. The visible handle position allows operators to quickly confirm the isolation status of the line.

What is the difference between a Spectacle Blind and a Spade and Spacer Set?

A Spectacle Blind is a single combined unit consisting of a solid blind section and an open spacer section connected by a central web. A Spade and Spacer Set consists of two separate components, a solid spade and an open spacer ring, which are individually installed between the flanges as required. Spectacle blinds are used where a single unit provides both functions, while separate spade and spacer sets are preferred for larger pipe sizes where handling a single combined unit is impractical.

What materials are Spectacle Blinds available in?

Spectacle Blinds, Spades and Spacers can be supplied in carbon steel (ASTM A516), stainless steel (304/304L, 316/316L), alloy steel, duplex steel, and nickel alloys. Material selection depends on the process fluid, operating pressure and temperature, corrosion conditions, and compatibility with the connected piping system.

What standard governs Spectacle Blinds and Spade and Spacer Sets?

Spectacle Blinds, Spades and Spacers are primarily manufactured per ASME B16.48, which covers line blanks for use with pipe flanges conforming to ASME B16.5. Flange dimensions and pressure ratings follow ASME B16.5 for standard sizes or ASME B16.47 for large diameter applications. Material requirements follow applicable ASTM standards, and piping design must comply with ASME B31.3 for process piping applications.

How is the thickness of a Spade or Spectacle Blind determined?

The required thickness of a spade or spectacle blind is calculated based on the nominal pipe size, flange pressure class, operating pressure, design temperature, material allowable stress, and applicable code requirements per ASME B16.48. Corrosion allowance may also be added depending on the service conditions. The manufacturer or engineering team should verify thickness calculations for critical applications.

Can you supply custom Spectacle Blinds and Spade and Spacer Sets?

Yes. We supply custom manufactured spectacle blinds, spades and spacers according to approved project drawings and specifications. These can be designed for non-standard pipe sizes, special pressure ratings, specific bore dimensions, custom handle configurations, and project-specified material grades. Material Test Certificates, dimensional inspection reports, PMI, and third-party inspection can be provided as required.