317L Round Bar

Spectacle Blind Flange, Pancake blind flangeSpectacle Blind, manufacturers, suppliers, exporters, traders, dealers, manufacturing companies, retailers, producers, Mumbai

Spectacle Blind Flange, Paddle blind flange, Spectacle Blind, Paddle blind

manufacturers, suppliers, oems, oem manufacturers, exporters, traders, dealers, manufacturing companies, producers, India

The use of blinds and spacers is an effective means of blocking flow into piping systems to prevent contamination, to ease maintenance, or to control flow rates.

The Spectacle Blind is a combination of these two popular components to give you a complete solution to your routing and flow control needs, especially when it comes to positive shutoffs.

In the same way that choosing the proper piping component is essential to ensuring reliable, long-term performance, choosing the right spectacle blind is also crucial. In order to determine the best option for you, you need to consider the following considerations in order to establish a solid foundation.


It is important to look at how spectacle blinds are designed in order to gain a better understanding of the benefits of spectacle blinds as well as some of their limitations.

As the name implies, it is a combination of a spectacle blank flange (also known as a spade or spec blind) and a paddle spacer (also known as a spacer ring). 

On one surface, the piping systems are completely enclosed, while on the other, a ring is provided with a diameter that matches the inside diameter of the pipes that are connected to it.

Each round is connected using a small nose piece or tie bar instead of a handle, web, or tie bar that would usually be used on each round.

As a result, the final product looks like a figure eight or a pair of spectacles, since that is the component’s name.

Steel Pipe and Steel Tube

As a result of this design, it is possible for the spectacle blind to be rotated as needed in order to complete the closure or full operation of a piping system.


Spectacle/Skillet Blind Installation

How does spectacle blindness benefit you?

It is common for spectacle blinds to be installed for long-term use in most cases. As a result of their simple operation as well as durable design, they provide a long life with minimal maintenance requirements.

Paddle blinds are installed between two horizontal runs of pipe. Instead of bolting the blind in place around the entire circumference of the pipe blind like you would do with a pipe flange, you should rather install it by inserting one of the spectacle skillet blind flange bolts through the hole on the central tie bar rather than bolting it in place around the entire circumference. In order to reinforce the connection between the flanges and the spectacle spectical blind, gaskets are used between both of them.

As a result, it is crucial that you take into consideration spectacle blind implementation during the design stage of your piping system.

In order to ensure a reliable and long-lasting connection between the line blind valve pipe flanges, the additional space between the pipe flanges will also require extended stud bolts.

Spade blinds are available in a wide variety of designs to suit virtually any planned implementation, including the following:

  • Female ring-joint blanks
  • Male ring-joint blanks
  • Raised face blanks
  • Flat face blanks

Prior to installation, it is important to consider how this will affect the gasket and flange requirements.

There are a number of common locations for the installation of spectacle, spacers for blinds, blinds, including:

  • In bypass lines
  • At inlets and outlets of rotary or static equipment
  • At inlets and outlets of storage and processing vessels
How does spectacle blindness benefit you?

Typical Uses For Spectacle Blinds

As part of the maintenance and operation of the system, spectacle blinds provide added flexibility. Additionally, they are also an excellent option in the event that there is a valve degradation or failure, or if there is an operator error that leads to a positive shutoff.

The adjustment of spectacle blinds is a straightforward process. You will need to loosen the bolts around the flange, leaving the bolt running through the spectacle blind in place. Then, rotate the desired face into the space between the pipes, and tighten the flange bolts again. Some piping installations will require new gaskets to be installed.

Spectacle Blind Limitations

 In spite of the convenience that spec blind flange offer over standalone slip and spacer blinds, there is one major disadvantage to spectacle blinds — their weight.

There is more evidence of this in large or complex piping systems where the weight of multiple blinds can quickly add unacceptable stresses to the overall design of a piping system.

As a result, it is usually recommended to use the standalone options to avoid excess load in these cases.

As a result, this method is typically used for spectacle blinds up to 16 inches in diameter. However, the ASME B16.48 standard provides coverage for spectacle blinds up to 24 inches in diameter.

However, it is important to keep in mind that weight is not just a matter of diameter. You will also need to take into account the ANSI/ASME classification as well. Due to its overall dimensions, a spectacle blind weighing 2500 pounds will have a smaller maximum diameter than a spectacle blind weighing 900 pounds, for example.