How do you install spectacle blind flange?
Spectacle Blind Installation Spectacle blinds install between two horizontal pipe runs. Instead of bolting the blind in place around the full circumference of the pipe like you would a pipe flange, you instead install it by inserting one of the flange bolts through the hole on the central tie bar.
Where should spectacle blinds be placed?
Normally, a Spectacle Blind is mounted in the “open” position so that flow through the pipe is possible. If the Spectacle Blind in the “close” position is rotated, the pipe is blanked off and no flow is possible. Maintenance on a pipesystem can be a reason to rotate the spectacle in the “close” position.
What is spectacle blind flange?
Spectacle Blinds are simple safety devices that are installed between two pipe flanges. During normal operation, the open end is installed as a spacer to allow uninterrupted flow. To stop the flow in the pipeline, the blind end is rotated into place between the flanges.
What is the difference between blank flange and blind flange?
Blind flanges are commonly produced and stocked in several different materials. They are often called Blank Flanges. These flanges are used for capping off or terminating another flange.
Does spectacle blind need gasket?
A spectacle blind is machined from a single piece of metal that is cut to match the pipe size, fit between two pipe flanges and requires an additional gasket when it is installed.
What is difference between Spade and spacer?
The Spade or Spacer is fitted in the line between two flanges and is bolted in place. The Spacer is used when the line is required open and the Paddle Blind or Spade is installed when the line is required to be blocked or closed.
How can you tell if a spacer is blind?
So the item in the line can be identified easily, a Spade and Spacer will be clearly marked with the word “SPADE” or “SPACER” stamped on the handle. Additionally it will be clearly marked with its size, rating, standard, material, heat number, Balcombe Engineering stamp and production traceability code.
What is a spectacle plate?
A spectacle blind is a steel plate cut into two discs of equal diameter and thickness. One disc is a solid plate while the other is a ring, whose inside diameter is equal to that of a flange. The two discs are connected by a small section of metal.
Do blind flanges need gaskets?
The best practice is to use a standard gasket for these blinds. Blind flanges, just like standard pipe flanges, can be raised face (RF) or flat faced (FF). If the flange is RF we would recommend a standard ring gasket that is appropriate for the service and/or test.
Where is jack screw flange used?
This jack screw is used to facilitate separating the flanges for inspection or replacement of the Orifice Plate and gaskets. The range of orifice flanges covers all standard sizes and ranges, and all common flange materials.
What is a slip on flange?
Slip on Flange is essentially a ring that is placed over the pipe end, with the flange face extending from the end of the pipe by enough distance to apply a weld bead on the inside diameter. The OD of slip on flange is also welded on the back side of the flange.
How many gaskets should be placed on each side of a slip blind?
The Spectacle Blind is inserted between two flanges: in order to guarantee a perfect waterlight two gaskets are normally mounted , one on each side of spectacle blind.
What is a blind gasket?
Similar to a regular flange, a blind flange has mounting holes around the perimeter and the gasket sealing rings are machined into the mating surface. The difference is that a blind flange has no opening for fluids to pass through. Instead, it is placed in between two open flanges, which stops the flow through a pipe.
What is a blind spade?
Spectacle blind, spade and spacer A spectacle blind consists of a spade and a spacer which are manufactured for the purpose of installation in one piece. It is used as a safety device to isolate a particular section of pipe or equipment when this section or this equipment is to be inspected or decommissioned.
What is difference between spade and spacer?
What is spacer ring?
The spacer is an all-metal band that is meant to sit between your engagement ring and your wedding band, or within a stack of multiple bands. It is intended to protect your diamond bands rings from wearing on one another.
What is blind plate?
A blind flange is a solid flange as shown below. The purpose of these is to block off a section of pipe or a nozzle on a vessel that is not used. (A nozzle is typically a pipe coming out of a vessel and is usually flanged so it can be connected to valves or piping).
Are spectacle blinds ASME approved?
Spectacle Blinds should be made from a plate or forging specification, approved for use by ASME B31.3, of essentially the same chemical composition as the mating flanges and piping involved. Spectacle Blinds ASME B16.48 may be used for installation between ASME B16.5 flanges
How do spectacle blinds work?
One of the discs is a solid plate, and the other is a ring, whose inside diameter is equal to that of a flange. Spectacle Blinds be applied in systems, which regularly need to be separated from other installations. Normally, a Spectacle Blind is mounted in the “open” position so that flow through the pipe is possible.
What happens if the spectacle Blind is in the close position?
If the Spectacle Blind in the “close” position is rotated, the pipe is blanked off and no flow is possible. Maintenance on a pipesystem can be a reason to rotate the spectacle in the “close” position. This run will take place through the hole, that is drilled in the connection piece.
How do I rotate my spectacle blinds?
By loosening of all bolts, and partial removal of their, the Spectacle Blind can be rotated. After replacing the gaskets (new gaskets are to recommend), the bolts can be re-assembled and tightened. Spades and Ring Spacers are basically the same as Spectacle Blinds, except that both are not attached to each other.