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Spectacle Blind Flange

Spectacle Blind Flange

A Spectacle Blind Flange, also called a spectacle flange or a figure-8 flange, is a special kind of flange used in pipes to stop flow temporarily or permanently. It consists of two metal discs—a solid blind flange and a spacer ring with a hole in the middle—joined together by bolts so that the discs can move independently. Spectacle blind Flanges are needed in many industries, including oil and gas, petrochemicals, and power production, because they are a safe and reliable way to isolate pipeline parts. A Spectacle Blind Flange’s main job is to control how fluids move through a waterway. By turning the spectacle blind, the flow can either be stopped totally or let through. When the solid part of the blind flange is lined up with the pipe, it forms a barrier that stops the fluid from going through. This section of the pipeline is effectively cut off from the rest. On the other hand, when the hole in the gap ring lines up with the pipe, it doesn’t block the fluid flow. Because they can be used for so many different things, Spectacle Blind Flanges are great for pipeline maintenance, fixes, and testing.
One of the most important benefits of Spectacle Blind Flanges is that they can keep people safe in dangerous places. When pipes carry dangerous or flammable materials, it’s important to have a reliable way to stop the flow for maintenance or repairs. Spectacle Blind Flanges are a safe way to stop the flow briefly so that workers can do their jobs without risking exposure to dangerous materials. Also, these flanges can handle high pressure, which means they can be used in tough industrial settings. Spectacle Blind Flanges are made to meet standards and requirements in the business. Most of the time, ASME B16.48 is used for flanges up to 24 inches in size, and API 590 is used for bigger flanges. These standards say how big Spectacle Blind Flanges can be, how much pressure they can handle, what materials they can be made of, and what kind of tests they need to pass. They ensure that different pipeline systems are consistent and compatible, making installation and upkeep easier. Several things need to be considered when fitting a Spectacle Blind Flange. Depending on the isolation needed, the blind flange or the spacer ring must be aligned properly. This adjustment ensures the seal is tight and reduces the chance of leaks. To make sure the connection is secure and doesn’t leak, it is also important to tighten the flange bolts according to the recommended torque specs.
Spectacle Blind Flanges are usually used to control flow but can also be used for other things in some situations. For instance, they can be used as filler flanges to fill the space between two flanges or as blank flanges to cap off the ends of a pipeline. In these cases, the sight blind is turned so that the hole in the spacer ring lines up with the pipeline. It creates a gap or fills a void. It makes Spectacle Blind Flanges even more versatile and lets them be used in more commercial situations. In conclusion, Spectacle Blind Flanges are important parts of pipeline systems because they provide a safe and effective way to stop flow temporarily or permanently. They are very important in industries like oil and gas, petrochemicals, and power production because they can control the flow of fluids, withstand high pressures, and keep people safe in dangerous situations. Spectacle Blind Flanges ensure pipeline maintenance, repairs, and testing are done quickly and correctly by following industry standards and best practices for installation. It improves the reliability and safety of industrial processes as a whole.

Spectacle Blind Flange Specifications

Dimensions : ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings
Size : 1/2″ (15 NB) to 48″ (1200NB)
Class : 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS, DIN Standard ND-6,10, 16, 25, 40 Etc.
DIN : DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636,DIN2637, DIN2638, DIN2673
BS : BS4504 , BS4504, BS1560, BS10
Flange Face Type : Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ)

Material & Grades of Spectacle Blind Flange

Stainless Steel Spectacle Blind Flanges :
ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L
Duplex & Super Duplex Steel Spectacle Blind Flanges :
ASTM / ASME A/SA 182 F 44, F 45, F51, F 53, F 55, F 60, F 61
Carbon Steel Spectacle Blind Flanges :
ASTM / ASME A/SA 105 ASTM / ASME A 350 , ASTM A 181 LF 2 / A516 Gr.70 A36, A694 F42, F46, F52, F60, F65, F706
Low Temperature Carbon Steel Spectacle Blind Flanges : ASTM A350, LF2, LF3
Alloy Steel Spectacle Blind Flanges :
ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91
Copper Alloy Steel Spectacle Blind Flanges : ASTM SB 61 , SB62 , SB151 , SB152 UNS No. C 70600 (Cu-Ni 90/10), C 71500 (Cu-Ni 70/30), UNS No. C 10100, 10200, 10300, 10800, 12000, 12200
Nickel Alloy Spectacle Blind Flanges :
ASTM SB564, SB160, SB472, SB162 Nickel 200 (UNS No. N02200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C 276 (UNS No. N10276), Alloy 20 (UNS No. N08020)

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