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Galvanized Figure 8 Blind Flange, RTJ 300 LB, ASME B16.48

Galvanized Figure 8 Blind Flange, RTJ 300 LB, 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 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

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