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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.
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What is the difference between lean and blind concrete?
Blind Concrete
What is a spectacle blind flange?
"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.References1. 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 is the difference between 6A-6B and 6A-6BX flanges?
6A-6B flanges are ring type joint which is not developed for face to face make up, where the bolting forces act on gasket. 6A-6BX flanges are also ring type joint but it is developed with raised face hence the bolting forces act on this raised face and not on the gasket if it is properly placed. And also the raised prevent the flange damage from excessive bolting torque.
What are the pressure rating for 150 ansi flanges?
20
Difference between blank space and white space?
In computer programming, these two terms are interchangeable.
