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Spectacle blind, Spectacle blind MANUFACTURER, Spectacle blind, Spectacle blind MANUFACTURER, Spectacle blind DEALER OF TATA STEEL, EXPORTER, Spectacle blind SUPPLIER IN MUMBAI, INDIA. 


The definition of a flange

An external or internal anchor flange is a protruding ridge, lip, or rim that can increase strength, facilitate attachment to another object, or assist in stabilizing and guiding the movements of a machine. In many cases, flanges are attached using bolts in a bolt circle pattern.

Spectacle blinds are made up of two pieces, a spade and a spacer, which are manufactured to be installed together as a single unit. When the pipe or equipment is being inspected or decommissioned, this is used as a safety device to isolate that particular section or equipment from the rest of the pipe or equipment. Obturators are different from valves in that they function as an isolation device rather than simply valves.

What is the difference between spectacle blind and spacer

A spectacle blind would not be as effective as two separate components (spade and spacer) depending on the size and class of flanges, so as to reduce weight and avoid handling heavy parts, it may make more sense to offer two separate components. In the piping and pipeline industry, spectacle blinds as well as spacers are pressure-retaining devices that are used in order to temporarily or permanently blind (close) or isolate a section of piping or pipeline.

  • It is a forged product consisting of a orifice flange spade and a ring spacer which are used to form the spectacle blind.
  • In the spectacle blind, one end has an opening in order to allow fluids to flow through it during operation, whereas the other end has a solid end in order to prevent flow during isolation or maintenance.
  • To close or open the fluid flow through the piping system, simply rotate the spectacle blind by 180 degrees.
  • Space-constrained situations, however, can be solved by using separate ring spacers and slip flange spades.
  • One of the two discs is always outside of the pipe, so one can easily see if the blind is closed or open, depending on whether one of the discs is outside of the pipe or not.
What is the difference between spectacle blind and spacer

Aspects of spectacle blinds

An understanding of spectacle blinds’ capabilities and limitations begins with an understanding of how they are designed.

The paddle blank (also known as a spade or slip blind) is combined with the paddle spacer (also known as a spacer ring). The piping systems are completely sealed on one side, while a ring matching the inside diameter of the connected pipes is on the other.

Rounds are connected using a small nose piece or tie bar instead of handles, webs, or tie bars.

As a result, the final result resembles a figure eight or spectacles, the component’s namesake.

An eyeglass blind is made from a steel plate that has been divided into two discs with equal diameters and thicknesses. A solid plate forms one disc, while a ring with an inner diameter comparable to a flange bolt chart forms the other disc. Small metal sections connect the two discs.

A spectacle blind is usually used in piping systems where a part of the system needs to be periodically isolated or separated from the rest of the system for either maintenance or safety reasons. The solid plate has the advantage of blocking liquid or gas from flowing into the pipe if it is positioned so that it is in situ, but the ring plate allows the product to flow through the pipe if it is positioned so the solid plate is in place.

A spectacle blind can be rotated, the plate replaced, the surrounding bolts loosened, and then the bolts reassembled and tightened.

A variety of face types can be fitted with spectacle blinds, including:

  • Designed with a raised face (for high-pressure applications)
  • Low-pressure (flat face)
  • The ring joint blank is used in conjunction with the ring joint gasket to make a ring joint.


The spectacle blinds provide additional flexibility during the maintenance and operation of the system as well as for maintenance. As an additional benefit, they are also a great option when it comes to ensuring positive shutoffs after valve degradation and failure, or when an operator has made a mistake.

The process of adjusting spectacle blinds is quite straightforward. Remove the bolts attached to the flange, leaving the one running through the spectacle blind in place, rotate the chosen face into the gap between the pipes, and tighten the flange bolts again. Some piping applications may require new gaskets.

What is the difference between spectacle blind and spacer


 The spacers

A Spade and Spacer serve the same function as a spectacle blind – they are essentially a simplistic valve. They are bolted into place between two slip on flange in a pipeline. Due to their bulky nature, they are sometimes chosen over spectacle blinds.

A spacer is used when the line needs to be open, and a spade is used when the line needs to be blocked or closed, so the spacer (a ring-shaped plate) is installed when the line needs to be both open and blocked.

There is a requirement to remove half of the surrounding bolts in order to change from one type to another and swap the Spade or Spacer over. This should be followed by the reinstallation and tightening of the bolts.

There is a particular handle that is shaped in a particular way for each spade or spacer, which allows engineers and maintenance crews to identify whether or not a spade or spacer is installed in the pipeline by the handle shape. Spades and spacers that are smaller in size often have a hole in the handle, while spades that are larger in size usually won’t have a hole in the handle.

The spades or spacers can usually be found in a wide range of different types of shapes, such as:

  • A raised brow
  • The face is flat
  • Assembling a ring joint sealing surface (to be used in combination with ring joint gaskets)

The use of spades and spacers for blinds is explained below

The use of spectacle blinds, spades, and spacers is used to provide flexibility when it comes to maintenance and operation of the system. As a result of this, it is vitally important to take into consideration this during the design process of your piping system. Blanks are installed in a horizontal line along the length of the wall. This is an example of where you can see the usage of these flanges in general at the following locations;

  1. There are several types of inlets and outlets for static equipment
  2. There are several locations where rotary equipment has inlets and outlets
  3. A fire heater’s inlet and outlet as well as the common headers to the heater
  4. As part of the bypass line
  5. Maximum number of batteries per unit

The spec blind is installed between the ASME B16.5 flanges and is designed in accordance with ASME B16.48 (Line Blanks) of the ASME standards. There are times when people use the term spec blind flanges or brake flanges interchangeably, but it is important to know that they are two unique items with different uses.

how to pack a pipe?

Pipe should be added to the bowl in a loose pinch, then the tamper should be used to gently compact it. It should now be filled about halfway. Top it off with another Put a pinch on it, then tamp it down.