What is a spectacle blind in piping?
What is a spectacle blind in piping?
Spectacle Blinds are simple safety devices that are installed between two pipe flanges. To stop the flow in the pipeline, the blind end is rotated into place between the flanges. This positively isolates the downstream piping and equipment. A Spectacle Blind is generally installed as a permanent fixture.
How do you rotate spectacle blinds?
Adjusting spectacle blinds is straightforward. Simply loosen the bolts around the flange leaving the bolt running through the spectacle blind in place, rotate the desired face into the space between the pipes, and tighten the flange bolts again, some piping applications will require new gaskets to be installed.
Where is spectacle blind used?
A spectacle blind is a safety device used to isolate a section of line or piece of equipment when the line or equipment needs to be inspected or removed from service. It is different than a valve in that the blind is a permanent or long term isolation device.
What is the difference between spacer and spectacle blind?
Spades and Ring Spacers are basically the same as Spectacle Blinds, except that both are not attached to each other. Spades and Spacers be applied in systems where maintenance is often not necessary, or in applications with large pipe sizes.
Why spacer is used in piping?
Spacer Rings, also known as piping spacers, are used between flanges to correct gaps or misalignment. Spacer rings are sometimes tapered and are almost always custom machined per very specific measurements.
What is FF and RF flange?
The flange face is the surface area that hosts the gasket. The 6 available types of flange face are flat (FF), raised (RF), ring joint (RTJ), lap joint, male and female (M&F), tongue and groove (T&G). RF and FF flanges may have different types of “finish” (i.e. roughness on top the surface): smooth, stock and serrated.
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 the 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 blocked or closed.
What B16 48?
This Standard covers pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing for operational line blanks in sizes NPS 1/2 through NPS 24 for installation between ASME B16. 5 flanges in the 150, 300, 600, 900, 1500, and 2500 pressure classes. Table of Contents.
What is the function of spacer?
A spacer (also sometimes called a holding chamber) is a device that makes using an inhaler easier and more effective. It attaches to the inhaler on one end and to a mouthpiece or mask on the other end.
How many types of flanges are there?
The key types of flanges are the welding neck, long welding neck, slip-on, socket weld, lap joint, threaded and blind flanges. In addition to these standard flanges, some special ones exist, called Weldoflange/Nipoflange and Elboflange, swivel flange, expander/reducer flange, and orifice flanges.
What is the difference between RTJ and RF?
RTJ flanges have grooves in their sealing faces, while RF flanges do not. If you want to make a connection between the two flanges, you can only apply a flat gasket. This flat gasket wil be make full contact with de sealing surface of the RF flange, but not with the sealing surface of the RTJ flange.
What should be engraved in the handle of a spectacle blind?
What should never lack is, that in the handle, the diameter and the Pressure Class of a Spade or Spacer is engraved; this applies also for the Spectacle Blind. The sealing surfaces of a Spectacle Blind, Spade or Ring Spacer are usually conducted in accordance with the Face Finish from the flange.
Where can I get custom design blanks for spectacle blinds?
Please contact our engineering department for custom design blanks. Our computerized stress analysis programs are always ready to meet our client needs.
How big do Spades have to be for a spectacle blind?
Depending on the flange size and the Pressure Class, Spades can weigh hundreds of pounds. To prevent unnecessary weight to a flange connections, usually will be chosen not for a Spectacle Blind, but for 2 separate parts.
Why is the spectacle blind in the open position?
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.