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"A spectacle blind - also known as a figure-8 blind - is generally a piece of metal that is cut to fit between two pipe flanges and usually sandwiched between two gaskets. A spectacle blind is often made from two metal discs that are attached to each other by a small section of steel. The shape is similar to a pair of glasses or "spectacles" - hence the name spectacle blind. One end of the blind will have an opening to allow flow through the pipe during operation and the other end is solid to block flow during maintenance. They are generally installed as a permanent device to separate process piping systems."[1]
The whole idea of a spectacle blind is so that one can be absolutely sure that an item of equipment is properly and securely blanked off with no possibility of any flow or leakage through a valve during maintenance. The flow can be diverted to other items of equipment but not just bypassed around the blank as this would compromise the safety function of the spectacle blind. The flow has to valved off and pressure relieved prior to loosening flange bolts and swinging the blind.
References
1. Steinmans, LLC, "What is the difference between a spectacle blind and a paddle blind or spade blind?", Online News Article, Web Link: http://spadeblinds.com/ournews/entry?id=6
What else can I help you with?
When do you change from spectacle blind to spacer and spade?
When you have space constraints for the positioning of the spectacle blind, then you can consider using spacers and blinds (which have just a handle)
How do you install blind flange?
To install a blind flange, first ensure that the pipe ends are clean and free from debris. Align the blind flange with the pipe, ensuring the gasket is placed correctly between the flange and the pipe. Use appropriate bolts to secure the flange, tightening them in a crisscross pattern to ensure even pressure. Finally, check for any leaks by testing the system under pressure.
What is the difference in blank and blind flanges?
Blind flange is put at the end of pipe or at the junction that would possibly be a future expansion into that direction. Piping is easier to drill or weld at the construction stage. Once it was in use, drilling or welding will need prolong cleaning especially when the fluid transferred is combustible. For the mean of future extension, either the blind or valve would be used to seal the end.
What is a swivel flange?
it is a flange that's it
How do you fit WNRF flange onto an RTJ flange?
Not. There's no way to connect a WNF to an RTJ flange.
What is a spectacle blind in a piping system and what is it for?
The whole idea of a spectacle blind is so that one can be absolutely sure that an item of equipment is properly and securely blanked off with no possibility of any flow or leakage through a valve during maintenance. The flow can be diverted to other items of equipment but not just bypassed around the blank as this would compromise the safety function of the spectacle blind. The flow has to valved off and pressure relieved prior to loosening flange bolts and swinging the blind.
What is the antonym of spectacle?
blind
Why blind flange is sometimes also termed as boilermaker?
A blind flange is the most common blind used by Boilermakers and there the simplest. It is also called an end blind.
When do you change from spectacle blind to spacer and spade?
When you have space constraints for the positioning of the spectacle blind, then you can consider using spacers and blinds (which have just a handle)
How do you use spectacle?
You look through a spectacle to improve your vision. Thanks you for your answer. I know a spectacle look like a glasses. But the matters i wonder is when and how to use a spectacle blind and blind space on piping line.( Used in transfering oil on piping) I am looking forward a answer from you.
Difference between spectacle blind and figure 8 blind?
They are the same thing.
What is the full form of BLRF?
BLRF is a type of flange. BLRF-blind raised face flange
How do you install blind flange?
To install a blind flange, first ensure that the pipe ends are clean and free from debris. Align the blind flange with the pipe, ensuring the gasket is placed correctly between the flange and the pipe. Use appropriate bolts to secure the flange, tightening them in a crisscross pattern to ensure even pressure. Finally, check for any leaks by testing the system under pressure.
How do you interpret spectacle blind open and closed in the drawing?
In the context of a drawing, "spectacle blind" refers to a design that obscures or limits visibility, creating an element of mystery or intrigue. An "open" spectacle suggests transparency and accessibility, inviting the viewer to engage with the work. Conversely, a "closed" spectacle implies confinement or restriction, potentially evoking feelings of isolation or introspection. Together, these elements can convey contrasting themes of visibility and concealment, influencing the viewer's emotional response.
What is an antonym for spectacle?
Antonyms for spectacles are normality and ordinariness! It might help your question.
What is the difference in blank and blind flanges?
Blind flange is put at the end of pipe or at the junction that would possibly be a future expansion into that direction. Piping is easier to drill or weld at the construction stage. Once it was in use, drilling or welding will need prolong cleaning especially when the fluid transferred is combustible. For the mean of future extension, either the blind or valve would be used to seal the end.
What is a flange spreader?
A flange spreader is a device that uses a ratchet, leverage and fulcrum points to spread a bolt together connection. Usually welded pipe to flange, then a seal or gasket, and then another flange, and then welded or threaded pipe carries on. A flange spreader is used to spread the flanges apart to change a gasket or put in a spec blind to blank either side of the connection.
