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.
Technical drawing for the female ring-joint facing (F/RTJ) figure-8 blank (spectacle blind flange) made in accordance with ASME B16.48. A: centerline distance; O: outside diameter of blank flange; B: inside diameter of the open end; T: blank thickness; W: web width; t: thickness of the tie bar.
ASME B16.48 Class 300 RTJ
Spectacle blind flange dimension
| NPS | O | A | T | W | B |
|---|---|---|---|---|---|
| 1/2 | 51 | 65 | 15.7 | 38 | 21 |
| 3/4 | 64 | 80 | 19.1 | 45 | 27 |
| 1 | 70 | 90 | 19.1 | 51 | 34 |
| 1-1/4 | 79 | 100 | 22.4 | 51 | 42 |
| 1-1/2 | 90 | 115 | 22.4 | 57 | 48 |
| 2 | 108 | 125 | 25.4 | 57 | 61 |
| 2-1/2 | 127 | 150 | 28.4 | 57 | 73 |
| 3 | 146 | 170 | 28.4 | 57 | 89 |
| 3-1/2 | 159 | 185 | 28.4 | 64 | 102 |
| 4 | 175 | 200 | 31.8 | 64 | 114 |
| 5 | 210 | 235 | 35.1 | 70 | 141 |
| 6 | 241 | 270 | 35.1 | 83 | 168 |
| 8 | 302 | 330 | 41.1 | 95 | 219 |
| 10 | 356 | 385 | 44.5 | 102 | 273 |
| 12 | 413 | 450 | 50.8 | 121 | 324 |
| 14 | 457 | 515 | 53.8 | 127 | 356 |
| 16 | 508 | 570 | 57.2 | 127 | 406 |
| 18 | 575 | 630 | 60.5 | 127 | 457 |
| 20 | 635 | 685 | 69.9 | 127 | 508 |
| 24 | 749 | 810 | 79.2 | 152 | 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.
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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