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 difference between spectacle blind and spacer?
Difference between Spectacle Blind and Spade and Spacers Spade and Spacer combinedly comparable to Spectacle Blind. So, a spectacle blind is combined form of spade and spacer. For larger pipe sizes the weight of spectacle blind become too heavy. So sometimes, as the requirement arises, a spade or spacer is used.
What is the purpose of a spectacle blind?
Spectacle Blinds are generally applied to permanently separating pipesystems, or just to connect with each other. A Spectacle Blind is a steel plate cut into two discs of a certain thickness. The two discs are attached to each other by section of steel similar to the nose piece of a pair of glasses.
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.
How do you measure the thickness of spectacle blinds?
Normally ANSI B31. 3 specifies formula for thickness calculation of blind. However,when we specify only pipe size, pressure rating and flange face, mostly all vendors inform the same thickness. For example, thickness of spectacle blind 10″ 600# RTJ will be 2.25″ (57 mm.)
What is a flange used for?
Flanges are helpful to connect pumps, valves, pipes, and other parts to form a piping system. Flanges are typically welded or thread screwed to connect. The use of flanges allows a person for maintenance and easy repair of the pipe system.
What is spacer in P&ID?
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. To change it from open to closed, only half the bolts need to be removed and the Spade or Spacer is swapped over. The removed bolts are then installed and tightened.
What is the difference between Spade and blind?
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 many types of flange 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.
How do you measure the thickness of a blind flange?
Re: Calculation of blind flange thickness The equation of calculating the thickness of blind flange as derived from ASME code, Section VIII, Div. 1, is: T = d [C P/S E + 1.9 W hG/S E d3]0.5 , for nomenclature see UG-34(c)(2) and Fig.