Forged SPECTACLE BLIND FLANGE ( FIGURE-8 BLIND FLANGE ) Manufacturer Changrun Supplies Forged Spectacle Flanges, D
N15-DN2000 (1/2-80 Inch),
Class rating: 300LB
Flange face: RF, FF, RTJ, TF, GF.
Material: ASTM A694 F56
Certificates: CE, ISO, PED, TS, BV, CQC.
Technical drawing for the figure-8 blank (spectacle blind flange) in accordance with ASME B16.48, with flat face. O: outside diameter; A: center distance; T: thickness of blank; W: web width; B: inside diameter of the open end; t: thickness of tie bar.
Technical drawing for the figure-8 blank (spectacle blind flange) in accordance with ASME B16.48, with raised face. The RF dimensions shall be furnished in accordance with ASME B16.5. The height of the raised face shall be in addition to the thickness T. For Class 150 & 300, the height of RF shall be 2 mm; for Class 600, 900, 1500 & 2500, the height of RF shall be 7 mm.
ASME B16.48 Class 300 RF/FF
Spectacle blind flange dimension
| NPS | O | A | T | W | B |
|---|---|---|---|---|---|
| 1/2 | 51 | 65 | 6.4 | 38 | 16 |
| 3/4 | 64 | 80 | 6.4 | 38 | 21 |
| 1 | 70 | 90 | 6.4 | 38 | 27 |
| 1-1/4 | 79 | 100 | 6.4 | 38 | 42 |
| 1-1/2 | 92 | 115 | 6.4 | 38 | 48 |
| 2 | 108 | 125 | 9.7 | 51 | 61 |
| 2-1/2 | 127 | 150 | 9.7 | 51 | 73 |
| 3 | 146 | 170 | 9.7 | 64 | 89 |
| 3-1/2 | 162 | 185 | 12.7 | 64 | 102 |
| 4 | 178 | 200 | 12.7 | 64 | 114 |
| 5 | 213 | 235 | 15.7 | 76 | 141 |
| 6 | 248 | 270 | 15.7 | 76 | 168 |
| 8 | 305 | 330 | 22.4 | 76 | 219 |
| 10 | 359 | 385 | 25.4 | 102 | 273 |
| 12 | 419 | 450 | 28.4 | 102 | 324 |
| 14 | 483 | 515 | 31.8 | 108 | 356 |
| 16 | 536 | 570 | 38.1 | 108 | 406 |
| 18 | 594 | 630 | 41.1 | 114 | 457 |
| 20 | 651 | 685 | 44.5 | 121 | 508 |
| 24 | 772 | 810 | 50.8 | 140 | 610 |
A spectacle blind flange (figure-8 blind flange) is a specialty flange made of two metal discs attached in the middle by a small section of steel. Spectable flanges get their name because they look like a pair of reading glasses, or spectacles. Spectacle flanges, also known as spectacle blind flanges, are most commonly used on piping systems that need to be separated regularly or where the flow through the systems is regularly stopped. One end of the spectacle flange is solid, while the other end has a hole in the center. The spectacle flange can be rotated to place either the solid or hollow end within the pipe system, thereby opening or closing the flow.
Spectacle blind flange be applied in systems, which regularly need to be separated from other installations. Normally, a Spectacle blind flange is mounted in the “open” position so that flow through the pipe is possible. If the Spectacle Blind in the “close” position is rotated, the pipe is blanked off and no flow is possible.
Material:
| Carbon Steel |
ASTM A105, ASTM A350 LF1, ASTM A350 LF2, S235JR, P245GH, P250GH, P280GH, ASTM A694 F42, ASTM A694 F46, ASTM A694 F52, ASTM A694 F56, ASTM A694 F60, ASTM A694 F65, ASTM A694 F70, etc |
| Stainless Steel |
ASTM A182 F304, ASTM A182 F304L, ASTM A182 F304H, ASTM A182 F316, ASTM A182 F316L, ASTM A182 F317, ASTM A182 F317L, ASTM A182 F321, ASTM A182 F310, ASTM A182 F347, etc. |
| Alloy Steel |
ASTM A182 F1, ASTM A182 F5, ASTM A182 F9, ASTM A182 F11, ASTM A182 F22, ASTM A182 F91, etc. |
| Duplex and super duplex steel |
ASTM A815 UNS S31803, ASTM A815 UNS S32205, ASTM A815 UNS S32750, ASTM A815 UNS S32760 |
Specification:
Size Range: DN15-DN2000, 1/2 Inch-80 Inch
Face Finish: RF, FF, RTJ, TF, GF
Standard & Pressure Ratings:
1. ANSI/ASME/ASTM B16.5/B16,47: 150 LB, 300 LB, 600 LB, 900 LB, 1500 LB, 2500 LB
2. DIN/UNI: PN6, PN10, PN16, PN25, PN40, PN64
Service:
Surface Treatment: Black painting, anti-rust varnish, anti-rust oil, hot-galvanized
Non-destructive Testing: penetration test, ultrasonic test, radiographic test
Certificate: CE, ISO, PED, TS, BV, CQC Certificate
Packing: Plywood Case or Pallet
Forged SPECTACLE BLIND FLANGE ( FIGURE-8 BLIND FLANGE ) Manufacturer Changrun Supplies Forged Spectacle Flanges, DN15-DN2000 (1/2-80 Inch), 150-2500 LB (PN6-PN420). Flange face: RF, FF, RTJ, TF, GF. Material: ASTM A105. Certificates: CE, ISO, PED, TS, BV, CQC.
Forged SPECTACLE BLIND FLANGE ( FIGURE-8 BLIND FLANGE ) Manufacturer Changrun Supplies Forged Spectacle Flanges, DN15-DN2000 (1/2-80 Inch), 150-2500 LB (PN6-PN420). Flange face: RF, FF, RTJ, TF, GF. Material: ASTM A105. Certificates: CE, ISO, PED, TS, BV, CQC.
Forged SPECTACLE BLIND FLANGE ( FIGURE-8 BLIND FLANGE ) Manufacturer Changrun Supplies Forged Spectacle Flanges, DN15-DN2000 (1/2-80 Inch), 150-2500 LB (PN6-PN420). Flange face: RF, FF, RTJ, TF, GF. Material: ASTM A182 F11. Certificates: CE, ISO, PED, TS, BV, CQC.
Forged SPECTACLE BLIND FLANGE ( FIGURE-8 BLIND FLANGE ) Manufacturer Changrun Supplies Forged Spectacle Flanges, DN15-DN2000 (1/2-80 Inch), 150-2500 LB (PN6-PN420). Flange face: RF, FF, RTJ, TF, GF. Material: ASTM A182 F316, ASTM A182 F316L. Certificates: CE, ISO, PED, TS, BV, CQC.
Forged SPECTACLE BLIND FLANGE ( FIGURE-8 BLIND FLANGE ) Manufacturer Changrun Supplies Forged Spectacle Flanges, D N15-DN2000 (1/2-80 Inch), Class rating: 300LB Flange face: RF, FF, RTJ, TF, GF. Material: ASTM A694 F56 Certificates: CE, ISO, PED, TS, BV, CQC.
Forged SPECTACLE BLIND FLANGE ( FIGURE-8 BLIND FLANGE ) Manufacturer Changrun Supplies Forged Spectacle Flanges, D N15-DN2000 (1/2-80 Inch), Class rating: 300LB Flange face: RF, FF, RTJ, TF, GF. Material: ASTM A105 Certificates: CE, ISO, PED, TS, BV, CQC.
Forged SPECTACLE BLIND FLANGE ( FIGURE-8 BLIND FLANGE ) Manufacturer Changrun Supplies Forged Spectacle Flanges, D N15-DN2000 (1/2-80 Inch), Class rating: 600 LB Flange face: RF, FF, RTJ, TF, GF. Material: ASTM A815 UNS S32205 Certificates: CE, ISO, PED, TS, BV, CQC.
Forged SPECTACLE BLIND FLANGE ( FIGURE-8 BLIND FLANGE ) Manufacturer Changrun Supplies Forged Spectacle Flanges, D N15-DN2000 (1/2-80 Inch), 150-2500 LB (PN6-PN420). Flange face: RF, FF, RTJ, TF, GF. Material: ASTM A105. Certificates: CE, ISO, PED, TS, BV, CQC.
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