Yuhong Group Co.,Ltd
Yuhong Holding Group Co.,LTD
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ASME B16.48 ASTM A182 F316L Stainless Steel Spectacle Blind Flange Figure-8 Blanks
spectacle blind flange, also known as figure-8 blank is composed of two separate metal discs that are welded together at the center. One disc is solid, known as the blind side, and the other disc has a circular opening, known as the spectacle side. These flanges are used to isolate a section of a pipeline for maintenance or inspection purposes. They effectively “block” the flow and allow for work to be carried out safely. With different working environment, they can be made of carbon steel, stainless, duple steel and alloy steel ... By rotating the spectacle blind, operators can isolate a section of the pipeline for repair or maintenance without needing to drain the entire system.
ASTM A182 F316L SS Blind Spectacle Flange Equivalent Grades
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
| SS 316L | 1.4404 / 1.4435 | S31603 | SUS 316L | 316S11 / 316S13 | 03Ch17N14M3 / 03Ch17N14M2 | Z3CND17‐11‐02 / Z3CND18‐14‐03 | X2CrNiMo17-12-2 / X2CrNiMo18-14-3 |
Forged and Plate Flanges
| Products | Size | |
| ASTM A182 SS 316L Slip-On Flanges | ASTM A182 SS 316L Threaded Flanges | Sizes 1/8″ – 36″ Raised Face or Flat Face |
| ASTM A182 SS 316L Weld Neck Flanges | ASTM A182 SS 316L Socket Weld Flanges | |
| ASTM A182 SS 316L Blind Flanges | ASTM A182 SS 316L Reducing Flanges | |
| ASTM A182 SS 316L Lap Joint Flanges | ASTM A182 SS 316L Plate Flanges | |
| ASTM A182 SS 316L Orifice Flanges | ASTM A182 SS 316L Forged Flanges | |
| ASTM A182 SS 316L Ring Type Joint Flanges | ASTM A182 SS 316L Square Flanges | |
Advantages:
SS 316L Flange Standards / Types And Pressure Class
| ASME/ANSI B 16.5 | Welding Neck Flange, Slip on Flange, Blind Flange, High Hub Blind Flange, Socket Weld Flange, Lap Joint Flange, Threaded Flange, Ring Type Joint Flange |
| PRESSURE CLASS | 150, 300, 400, 600, 900, 1500, 2500 |
| ASME/ANSI B 16.47 | Welding Neck Flange, Blind Flange [Series A & B] |
| PRESSURE CLASS | 75, 150, 300, 400, 600, 900 |
| ASME/ANSI B 16.36 | Welding Neck Flange, Slip on Flange, Threaded Flange |
| PRESSURE CLASS | 300, 400, 600, 900, 1500, 2500 |
| BS 4504 SEC 3.1 | Welding Neck Flange, Hubbed Slip on Flange, Hubbed Threaded Flange, Lapped Pipe End Flange, Plate Flange, Loose Plate Flange, Loose Plate With Weld Neck Flange, Blank Flange |
| PRESSURE CLASS | PN 2.5 TO PN 40 |
| BS 4504[PART 1] | Welding Neck Flange, Hubbed Slip-On Hubbed Threaded, Plate Flange, Loose Plate With Weld On Plate Collar, Blank Flange |
| PRESSURE CLASS | PN 2.5 TO PN 400 |
| BS 1560 BOSS | Welding Neck Flange, Socket Welding Flange, Slip-On Flange, Blind Flange, Screwed Boss Flange, Lapped Flange |
| PRESSURE CLASS | 150, 300, 400, 600, 900, 1500, 2500 |
| BS10 | Welding Neck Flange, Plate Slip-On Flange, Screwed Boss Flange, Slip-On Boss Flange, Blind Flange |
| TABLE | D, E, F, H |
| DIN FLANGES | DIN 2527, 2566, 2573, 2576, 2641,2642, 2655, 2656, 2627, 2628, 2629, 2631, 2632, 2633, 2634, 2635, 2636, 2637,2638, 2673 |
| PRESSURE CLASS | PN 6 TO PN 100 |
The main purpose of using a blind spectacle flange is to temporarily block off a pipeline or create a leak-proof seal. Here are some specific purposes and benefits of using a blind spectacle flange:
Maintenance and Repair: The blind spectacle flange allows operators to isolate a specific section of the pipeline for maintenance or repair work without shutting down the entire system. This eliminates the need to drain the entire system, saving time, effort, and resources.
Pressure Testing: Blind spectacle flanges are commonly employed during pressure testing of pipelines or equipment. By closing off a certain portion of the system, operators can accurately test the pressure and integrity of that specific section.
System Integrity: The blind side of the spectacle flange provides a secure, leak-proof seal when the spectacle side is closed. This prevents any fluid from flowing through the flange, ensuring the integrity and ety of the pipeline system.
Temporary Blockage: In certain situations, it may be necessary to temporarily block the flow of fluid in a pipeline. Examples include isolating a section for maintenance, controlling the flow of different process streams, or redirecting the flow to alternative routes. The blind spectacle flange can be rotated to the closed position to effectively block off the flow.
Flexibility and Control: With the ability to rotate the spectacle blind, operators have the flexibility to control the flow in a pipeline system as needed. This allows for efficient maintenance, testing, and control of fluid movement.
ety Considerations: The blind spectacle flange helps ensure the ety of personnel and equipment during maintenance or repair activities. By shutting off the flow through the flange, potential hazards associated with live fluids can be eliminated, allowing work to be carried out ely.
Application
Blind spectacle flanges are employed in a wide range of industries, including oil and gas, chemical, petrochemical, and power generation. They are used in various applications, such as pipelines, pressure vessels, vessels, tanks, and processing equipment.
