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Blind Flange

A blind flange is a disk that is usually used to block off a pipeline or to create a stop on it. A blind flange has mounting holes around its perimeter and gasket sealing rings that are machined into the mating surface, much like a regular flange. However, a blind flange is not equipped with an opening to let fluids pass through. The blind flange, on the other hand, is placed between two open flanges in the pipe, stopping the flow through it. A lot of time, this type of blockade is used when adding a second line to an existing pipeline or when installing a new valve to an existing pipeline.

Blind Flanges Are Used In The Following Areas:

1. A spade blind plate is placed at the junction with the pipe at the initial driving preparation stage, in order to test the strength of the pipeline and to test its tightness. However, it is not possible to do the testing in parallel with other equipment that is connected (such as a turbine, compressor, gasifier, reactor, etc.). A blind plate is placed at the junction with the pipe to make it easier to see.
2. There are various process material pipes that are connected to the boundary area outside of the boundary area before the device is parked, if the pipe is still in operation, a blind plate is placed at the shut-off valve to block the pipe from being operated.
3. As the device is in multiple series, the total pipeline from the boundary area is divided into a number of series, and the manifold is placed at the shut-off valve at the end of each pipeline series.
4. An automatic shut-off valve is placed at the front of the device if it needs to be repaired, inspected, or switched to another device or if it requires the equipment to be completely isolated when the blind plate is placed there.
5. Seesaws are installed at the shut-off valve when pressurized pipelines or replacement gas pipelines (such as nitrogen pipelines and compressed air pipelines) are connected to the equipment.
6. It is necessary to drain the low point of the equipment and pipelines before the unit can be loaded. If the process medium needs to be concentrated into a single collection system, a blind plate is installed after the valve is closed.
7. A blind plate or wire plug should be provided after the valve on the exhaust, drain, and sampling pipes of equipment and pipelines, except in the case of non-toxic, non-hazardous, and non-explosive materials.
8. During the staged implantation of a device, the interconnected pipes are fitted with a seesaw at the cut-off valve for enabling subsequent stages of the construction to be carried out.
9. In normal production, some auxiliary pipes that are necessary to be completely cut off must be protected with blind plates to keep them from being damaged or damaging the machine.

Spectacle Blinds

A spectacle blind is a simple safety device that is placed between two pipe flanges in order to provide a measure of safety. In normal operation, the open end is used as a spacer, keeping the flow uninterrupted. In order to stop the flow in the pipeline, the blind end must be rotated into place between the flanges, which isolates downstream piping and equipment. In general, Spectacle Blinds are installed on a permanent basis. The geometry of the device gives a quick visual indication of its orientation as well as whether or not it is safe to begin work downstream based on its orientation.

Both the flange spacer ring and spectacle blind flange are used in order to isolate sections of pipelines or equipment when they are needed for inspection or to be removed from the piping system. Yet, they are actually quite different from one another. Let us explore what is the difference between them next.

Spectacle Blind Flanges Application

•  A stainless steel spectacle blind flange is used in the oil and gas pipeline industry
•  In the chemical industry, spectacle blind flanges are used for a variety of purposes
•  The use of alloy steel spectacle blind flanges in the plumbing industry is widespread
•  Flanges with flat faces for use in the heating industry
•  The use of spectacle blind pipe flanges in the water supply system is extensive
•  Spectacle blind forged flanges are used in power plants to meet the requirements of ANSI B16.5
•  The Paper & Pulp Industry uses Spectacle Blind Plate Flanges for a range of applications
•  Use of Spectacle Blind Flanges in General Purpose Applications
•  The use of steel spectacle blind flanges in the fabrication industry is extensive
•  Aspects of the use of spectacle blind flanges in the food processing industry
•  The use of pipe flange spacer in structural pipes is well known

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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.

WHAT IS A SPECTACLE BLIND?

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.

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

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

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Blind flanging definition 

A blind flange is a disk that is usually used to block off a pipeline or to create a stop on it. A blind flange has mounting holes around its perimeter and gasket sealing rings that are machined into the mating surface, much like a regular flange. However, a blind flanged is not equipped with an opening to let fluids pass through. The spool piece flange, on the other hand, is placed between two open flanges in the pipe, stopping the flow through it. There are a number of instances when this type of blockade is used when either adding a new line to an existing pipeline or when adding a new valve to an existing pipeline.

Flanges are generally installed on either side of the connection, with the material being sealed in between, and are usually found on either side of the connection. These kinds of flanges are made of a variety of materials, including steel, aluminum, copper, brass, and plastic. If you are considering selecting blinds of this type, it is important to consider the thickness before purchasing.

It is common for blind flanges to be used in any industry that utilizes pipe. There are a number of face types (RTJ, Raised, and Flat Face) available at every pressure rating. It is possible to insert a blind between two flanges to block the flow, but this isn’t a good idea when it comes to piping. A spectacle blind is more suitable when trying to block flow temporarily in a pipe.

The installation of a blind flange would be placed at the end of a valve to ensure that the valve will not be accidentally opened during operation, in order to prevent the escape of the fluid.

When designing a piping system for expansion, a blind flange can be used to allow for bolting on piping after the expansion has been completed. A blind flange is a design that enables the expansion or continuation of a pipeline simply by adding an extra flange to the final flange of the pipeline. When used on a manifold in dirty service, it can be used to clean out or inspect the piping during a shutdown by the operations and maintenance staff.

Considering how a blind flanged will be removed from the vessel manway is imperative when putting one on a vessel manway.

 The flange may need a lifting eye for a crane or it may need to be supported by something specific such as a davit that can hold it in place after the bolts are taken out. Care needs to be taken so that the davit can support the total weight of the flange after it has been removed.

What Is A Blind Flange, The Purpose Of Blind Flanges

The blind flanges are essentially caps on blind flange pipe and are used to seal off leaking fluid. In situations where there might be pressure in a line or entrained solids in the line, this is particularly important. It is common for flange blind to be used to cap drill pipes, casing, and tubings, making them very effective at stopping leaks once installed properly. They are typically used for this purpose.

Blind Flange Welding

While it is relatively simple to weld flange blind, it takes a substantial amount of experience and skill in order to perform it properly. In order to begin the welding process, you must determine which welding process will be most appropriate for your job. Several types of welding can be used in order to accomplish this, such as arc welding, oxyfuel welding, MIG welding, etc. After you have selected the appropriate welding method, you must ensure that all surfaces are cleaned before beginning the welding process. It is important to prep the surface properly, and to take all precautionary measures to protect yourself while welding each section, using appropriate welding techniques based on the instructions given by the manufacturer in order to complete the welding process. Keeping all welds neat and tidy is important when it comes to ensuring that there will be no leaks later on when pressure is applied.

Blind Flange Types

There are several kinds of blank flange vs blind flange, depending on the purpose for which they are intended—as a matter of fact, blind flanges are available in many different sizes and materials based on their intended purpose. Thus, they can be used in almost any situation that may arise when a pipe or other component needs to be sealed off during maintenance operations, and they are therefore ideal for this kind of situation. Also, there are special types, such as high-pressure blind flanges, which are designed for specific applications that require higher levels of pressure, vacuum, and other extreme pressure levels; these types generally have thicker walls than regular models so that they can be used at higher pressures or vacuums with greater efficiency.

Correct Way To Install Blind(Blank) Flanges

Using Blind Flanges is a relatively straightforward and straightforward process. First, you will need to ensure that the end of your pipe is clean and smooth, as there will be no burns, dents, or other obstructions on the surface of your pipe that will come in contact with the blind flange. It is highly recommended to thoroughly clean and dry the parts before assembly is started to ensure the proper fitment and to prevent corrosion from occurring down the road as well as to prevent seizing and corrosion from occurring.

Basically blind flange with the bolts installed looks like one bolt is at the top while the other is below the blind flange vs blank flange when you look at it. It is important to ensure that the locking nuts are tightened together, and then you should place the nuts over the respective bolt holes (the lower nut should go first of all).

As soon as you have tightened down both locking nuts on their respective bolts, you will be able to slide the two parts of your blind flange together, making sure that all spacer rings are inside the flanges. Once you have tightened down both locking nuts on their respective bolts, you will be able to install your Blind Flange onto your pipe once you have tightened down the locking nuts on both bolts.

Blank Flange Working Process

When you connect two or more pipes together with a blind flange, you do not need to have a faceplate for the connection. The installation process for these types of flanges requires that the pipe on one side is beveled and flattened in order to allow the other side’s surface to form flush with the pipe on one side. This way, when you tighten down the bolts holding them together, they create pressure and a seal between the two surfaces as a result.

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Spectacle Blinds

It is generally the case that spectacle blinds are applied to permanently separate pipe systems or they can also be applied to connect two pipe systems together. Steel plates with various thicknesses are slit into two discs of a certain size and made to look like glasses blinds.

Discs are attached to each other by a section of steel that looks a lot like a nose piece of a pair of glasses that is located behind the nose of the glasses. As for the discs, one is a solid plate, while the other is a ring, whose inside diameter is equal to the internal diameter of the flanges on either side.

When applying Spectacle Blinds, you will want to consider systems, where they are regularly required to be isolated from other systems. A Spectacle Blind is usually mounted in an open position so that flow through the pipe from the side can take place as normal. The pipe flange is blanked off if the Spectacle Blind is rotated from the “open” position to the “close” position and this prevents any flow from proceeding.

The maintenance of a pipe system can be a reason for rotating a spectacle in the “close” position. The run will be accomplished through the hole drilled in the connection piece. This is accomplished by loosening all the bolts, and by partially removing the bolts until the spectacle blind can be rotated. The bolts can then be reassembled and tightened, after which the gaskets should be replaced (new gaskets are highly recommended).

Typical Uses For Spectacle Blinds

Spectacle blinds provide added flexibility over traditional roller blinds and are an excellent option for ensuring that a valve is shut off in the event of difficulty in adjusting it, damage to the valve, or an operator error due to mechanical issues.

There is no complicated process for adjusting spectacle blinds. It is as macbook spectacle simple as loosening the bolts around the flange and leaving the bolt running through the spectacle blind in place, rotating the spectacle blind into the space between the pipes, and tightening the flange bolts again. In some cases, a new gasket may be required for some piping applications.

Spectacle Blind Flanges Have Advantages:

• There is no need for welding when it comes to installing spectacle flanges.
• Spectacle flanges can be made with a large range of 7 pounds of pressure tolerances.
• Aspect flanges can be customized according to the customer’s specific requirements.

Disadvantages Of Using Spectacle Blind Flanges

• Low Strength 

A spectacle blind is usually much weaker than a solid flange because it is made up of a metal plate that is inserted between two flanges and attached to them using bolts or studs. This makes them more fragile than solid flanges. There are situations when strong sealing is needed in order to withstand high pressure, temperature, or vibration. This can be a major disadvantage in certain applications.

• Cost 

The costs associated with the purchase of spectacle blinds may be higher than the costs associated with other types of flanges because they require additional labor to assemble and install them. Additionally, they require more bolts to hold the blank together, thus increasing the installation costs as well.

• Limited Options 

It is uncommon for spectacle blinds to be available in a large number of sizes and materials, because manufacturers generally offer only a small number of grades that are designed for different pipe systems common to many industries, including those that utilize oil and gas, and chemical plants. It is possible that spectacle blinds from one manufacturer are not as versatile as slip-on flanges or weld neck flanges, which have a wide range of materials and sizes available to be fabricated for various applications. 

• Corrosion Risk 

It is common for spectacle blinds to come with gasket seating surfaces on both sides of the blind. If water accumulates in the confined space over time as a result of condensation or any other cause, these areas can become corroded, resulting in corrosion effects such as the formation of holes in the plate which reduces the thickness of the wall until the blind fails completely during operation.

Spades

A Spade and Ring Spacer differ from Spectacle Blinds in that they are not attached to each other in the same way, and they are connected to each other independently.

It can be applied to systems that require very little maintenance, such as those requiring large pipe sizes, or those requiring spacers. According to the flange size chart and pressure class, spades can weigh hundreds of pounds. In order to avoid the unnecessary weight added to a flange connection, it is usually chosen not for a spectacle blind, but for two separate parts instead.

In some cases, spades and spacers are desired over spectacle blinds where there is no need to directly alter the interior of the pipeline, as they are simply a simpler valve to fit between two flanges and to lock into place. They are therefore preferred over spectacle blinds when spacers are bulkier.

spectacle definition

There is a spacer (an oval-shaped plate) used when the line needs to be open, and a spade (still an oval-shaped plate), which is used when it is necessary to close or block the line.

There are a couple of things that need to be done in order to switch between these two models. First, half the surrounding bolts must be removed. Secondly, the Spade must be swapped over. The bolts can then be tightened again.

It is common to see engineers or maintenance crews use spades and spacers that have a handle that is shaped in such a way that they can tell if a spade or spacer is in the pipeline or not. A lot of smaller spades and spacers tend to have a hole in the handle while there is no hole in the handle for the spade.

Applications Of Spectacle Blinds, Spades, And Spacers

They are often used in a variety of industries including Petrochemicals, LNG, Desalination, Oil & Gas drilling, and mining, as they can be used to provide flexibility during operation and maintenance. • For the installation and maintenance of the equipment at both the source and destination

• The inlets and outlets of static and rotary machines should be free of debris
• A bypass line is used for this purpose
• The unit battery is at its maximum capacity
• In the case of high-pressure lines, double isolation is required

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What Are Blind Flanges?

Blind Flanges Are Frequently Used To Act As A Temporary Pressure Test Flange. They Can Also Be Utilized In Order To Seal Off A Pipe Or Nozzle So It Can Be Rerouted For Oil Or Gas And Can Be Retrained. Blind Flanges Are Mostly Used For Temporary Pressure Testing Before Being Permanently Certified.

Several Types Of Blind Flanges Are Available. The Two Most Common Types Are Flat Face (FF) Blind Flanges And Raised Face (Rf) Blind Flanges. Flat Face Flanges Have A Smooth, Level Surface All Over Their Surface. In The Case Of A Raised Face Flange, flange meaning the Middle Area Of The Flange Is Slightly Elevated, Which Creates Two Levels On The Surface.

Each Year, There Are More Than 1,382,569 Million Miles Of Pipeline Running Beneath The U.S., Which Are Used To Transport Trillions Of Cubic Feet Of Natural Gas (Not To Mention Hundreds Of Billions Of Tons Of Liquid Petroleum Products) In The Country. That Is A Lot Of Pipelines! 

There Are Times When You Will Be Re-Routing Or Changing Any Of The Pipes In Any Way. Therefore, Blind Flanges Will Be Necessary For The Re-Routing And Changing Of Those Pipes. The Need For Blind Flanges Is Also A Necessity If You Plan On Doing Pressure Testing On The Pipeline. So, If You’re Going To Work On Any Oil Or Gas Pipeline, Then Blind Flanges Are Necessary.

There Are Several Types Of Blind Flanges That Can Be Found On The Market Today, And They Can Be Manufactured In A Wide Variety Of Different Materials. As Well As Steel, Blind Flanges Are Made From A Number Of Other Metals. In blind flanged Addition To Being Forged For Additional Strength, High-Strength Forged Products Can Withstand Even Higher Forces And Pressure Than Standard Metal Pipe Flanges. What You Really Want Is A Good Supplier That Can Supply You With The Right Materials And Components So That Your Flanges Will Perform At The Highest Level.

Where Are Blind Flanges Most Commonly Used?

In The Petrochemical Industry, The Pipe Engineering Industry, Public Services, And Water Works, Blind Flanges Are Commonly Used To Fabricate Joints.

A Blind Flange Is Useful For Making Repairs To A Pipeline Further Up The Line. It Can In Fact Be Built Into The Final Length Of A Pipeline During The Construction Of It To Incorporate A Blind Flange For Expansions Or Extensions Of The Pipeline. By Adding Onto The Final Flange, You Can Expand Or Continue The Pipeline Just By Adding More Materials.

What Do Blind Flanges Do?

If There Were Not Blind Flanges On Pipelines, It Would Be Almost Impossible To Repair Or Perform Ongoing Maintenance On Pipelines Unless The Flow Had To Be Shut Down At One Of The Earlier Valves, Which Could Result In the Miles Worth Of Pipeline Being Damaged.

Using Flanged Pipes Has Significantly Reduced The Amount Of Time It Takes To Construct Pipelines And Made The Process Of Repairing And Replacing Sections Of Pipelines Much Easier. As A Result Of This, Sections Of Pipe Can Now Be Assembled Anywhere In The World And Shipped To The Job Site In Order To Complete The Repair. Once They Are There, They Can Simply Be Plugged In And Done.