SPECTACLE BLINDS
Also called: Spectacle Blinds, Spectacle Blank, Figure-8 Blind.
Standard：ASME/ANSI B16. 48, B16.5, B16. 47 A, ГОСТ 12826-60.
Size Range: 15 mm-1500' mm (1/2"-60")
Sealing Type: Flat Face, Raised Face, Ring Joint
Materials: 321, 304/304L, 316/316L,316Ti,16MN, St.20 09Г2С, 12Х18Н10Т, 10Х17Н13М2Т, 08Х17Н13М2Т
Spectacle Blinds (also known as Figure-8 Blanks, Spectacle Flanges, or Eye-Fitting Blinds) are used for positive isolation of pipeline sections. The "Figure-8" design allows for quick visual confirmation of line status (Open/Closed) and easy changeover by simply rotating the blind. Ideal for temporary shutdowns during maintenance or repair work.
Complete Assembly: We supply either one-piece welded spectacle blinds (closed end + spacer ring on a single handle) or separate components: Paddle Blanks (blind end) and Spacer Rings upon request.
Quality Assurance: All products undergo strict dimensional inspection and pressure testing. Material certificates and quality passports are available upon request.
Application: Designed for use in aggressive media, high-pressure steam, oil & gas, chemical processing, and power generation industries.
Traceability: Each blind is permanently marked with size (DN/NPS), pressure class (PN/Class), material grade, and heat number.
Basic dimensions for ASME B16.48 Class 150 figure-8 blanks (spectacle blind flanges) with FF or RF.
NPS
O
A
T
W
B
1/2
45
60
3.0
38
16
3/4
54
70
3.0
38
21
1
64
80
3.0
38
27
1-1/4
73
90
6.4
38
42
1-1/2
83
100
6.4
38
48
2
102
120
6.4
51
61
2-1/2
107
140
6.4
51
73
3
133
150
6.4
64
89
3-1/2
159
175
9.7
64
102
4
172
190
9.7
64
114
5
194
215
9.7
76
141
6
219
240
12.7
76
168
8
276
300
12.7
76
219
10
337
360
15.7
102
273
12
406
430
19.1
102
324
14
448
475
19.1
108
356
16
511
540
22.4
108
406
18
546
580
25.4
114
457
20
603
635
28.4
121
508
24
714
750
31.8
140
610
