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ASTM A694 F56 Spectacle Blind Flange, RF/FF, Class 300, ASME B16.48

ASTM A694 F56 Spectacle Blind Flange, RF/FF, Class 300, ASME B16.48

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

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